| 1 | /* Locking in multithreaded situations.
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| 2 | Copyright (C) 2005-2021 Free Software Foundation, Inc.
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| 3 |
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| 4 | This file is free software: you can redistribute it and/or modify
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| 5 | it under the terms of the GNU Lesser General Public License as
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| 6 | published by the Free Software Foundation; either version 2.1 of the
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| 7 | License, or (at your option) any later version.
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| 8 |
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| 9 | This file is distributed in the hope that it will be useful,
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| 10 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 12 | GNU Lesser General Public License for more details.
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| 13 |
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| 14 | You should have received a copy of the GNU Lesser General Public License
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| 15 | along with this program. If not, see <https://www.gnu.org/licenses/>. */
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| 16 |
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| 17 | /* Written by Bruno Haible <bruno@clisp.org>, 2005.
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| 18 | Based on GCC's gthr-posix.h, gthr-posix95.h, gthr-win32.h. */
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| 19 |
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| 20 | /* This file contains locking primitives for use with a given thread library.
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| 21 | It does not contain primitives for creating threads or for other
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| 22 | synchronization primitives.
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| 23 |
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| 24 | Normal (non-recursive) locks:
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| 25 | Type: gl_lock_t
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| 26 | Declaration: gl_lock_define(extern, name)
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| 27 | Initializer: gl_lock_define_initialized(, name)
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| 28 | Initialization: gl_lock_init (name);
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| 29 | Taking the lock: gl_lock_lock (name);
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| 30 | Releasing the lock: gl_lock_unlock (name);
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| 31 | De-initialization: gl_lock_destroy (name);
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| 32 | Equivalent functions with control of error handling:
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| 33 | Initialization: err = glthread_lock_init (&name);
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| 34 | Taking the lock: err = glthread_lock_lock (&name);
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| 35 | Releasing the lock: err = glthread_lock_unlock (&name);
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| 36 | De-initialization: err = glthread_lock_destroy (&name);
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| 37 |
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| 38 | Read-Write (non-recursive) locks:
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| 39 | Type: gl_rwlock_t
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| 40 | Declaration: gl_rwlock_define(extern, name)
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| 41 | Initializer: gl_rwlock_define_initialized(, name)
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| 42 | Initialization: gl_rwlock_init (name);
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| 43 | Taking the lock: gl_rwlock_rdlock (name);
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| 44 | gl_rwlock_wrlock (name);
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| 45 | Releasing the lock: gl_rwlock_unlock (name);
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| 46 | De-initialization: gl_rwlock_destroy (name);
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| 47 | Equivalent functions with control of error handling:
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| 48 | Initialization: err = glthread_rwlock_init (&name);
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| 49 | Taking the lock: err = glthread_rwlock_rdlock (&name);
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| 50 | err = glthread_rwlock_wrlock (&name);
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| 51 | Releasing the lock: err = glthread_rwlock_unlock (&name);
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| 52 | De-initialization: err = glthread_rwlock_destroy (&name);
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| 53 |
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| 54 | Recursive locks:
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| 55 | Type: gl_recursive_lock_t
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| 56 | Declaration: gl_recursive_lock_define(extern, name)
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| 57 | Initializer: gl_recursive_lock_define_initialized(, name)
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| 58 | Initialization: gl_recursive_lock_init (name);
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| 59 | Taking the lock: gl_recursive_lock_lock (name);
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| 60 | Releasing the lock: gl_recursive_lock_unlock (name);
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| 61 | De-initialization: gl_recursive_lock_destroy (name);
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| 62 | Equivalent functions with control of error handling:
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| 63 | Initialization: err = glthread_recursive_lock_init (&name);
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| 64 | Taking the lock: err = glthread_recursive_lock_lock (&name);
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| 65 | Releasing the lock: err = glthread_recursive_lock_unlock (&name);
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| 66 | De-initialization: err = glthread_recursive_lock_destroy (&name);
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| 67 |
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| 68 | Once-only execution:
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| 69 | Type: gl_once_t
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| 70 | Initializer: gl_once_define(extern, name)
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| 71 | Execution: gl_once (name, initfunction);
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| 72 | Equivalent functions with control of error handling:
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| 73 | Execution: err = glthread_once (&name, initfunction);
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| 74 | */
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| 75 |
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| 76 |
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| 77 | #ifndef _LOCK_H
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| 78 | #define _LOCK_H
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| 79 |
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| 80 | #include <errno.h>
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| 81 | #include <stdlib.h>
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| 82 |
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| 83 | #if !defined c11_threads_in_use
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| 84 | # if HAVE_THREADS_H && USE_POSIX_THREADS_FROM_LIBC
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| 85 | # define c11_threads_in_use() 1
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| 86 | # elif HAVE_THREADS_H && USE_POSIX_THREADS_WEAK
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| 87 | # include <threads.h>
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| 88 | # pragma weak thrd_exit
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| 89 | # define c11_threads_in_use() (thrd_exit != NULL)
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| 90 | # else
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| 91 | # define c11_threads_in_use() 0
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| 92 | # endif
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| 93 | #endif
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| 94 |
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| 95 | /* ========================================================================= */
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| 96 |
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| 97 | #if USE_ISOC_THREADS || USE_ISOC_AND_POSIX_THREADS
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| 98 |
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| 99 | /* Use the ISO C threads library. */
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| 100 |
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| 101 | # include <threads.h>
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| 102 |
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| 103 | # ifdef __cplusplus
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| 104 | extern "C" {
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| 105 | # endif
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| 106 |
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| 107 | /* -------------------------- gl_lock_t datatype -------------------------- */
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| 108 |
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| 109 | typedef struct
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| 110 | {
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| 111 | int volatile init_needed;
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| 112 | once_flag init_once;
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| 113 | void (*init_func) (void);
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| 114 | mtx_t mutex;
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| 115 | }
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| 116 | gl_lock_t;
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| 117 | # define gl_lock_define(STORAGECLASS, NAME) \
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| 118 | STORAGECLASS gl_lock_t NAME;
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| 119 | # define gl_lock_define_initialized(STORAGECLASS, NAME) \
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| 120 | static void _atomic_init_##NAME (void); \
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| 121 | STORAGECLASS gl_lock_t NAME = \
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| 122 | { 1, ONCE_FLAG_INIT, _atomic_init_##NAME }; \
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| 123 | static void _atomic_init_##NAME (void) \
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| 124 | { \
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| 125 | if (glthread_lock_init (&(NAME))) \
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| 126 | abort (); \
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| 127 | }
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| 128 | extern int glthread_lock_init (gl_lock_t *lock);
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| 129 | extern int glthread_lock_lock (gl_lock_t *lock);
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| 130 | extern int glthread_lock_unlock (gl_lock_t *lock);
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| 131 | extern int glthread_lock_destroy (gl_lock_t *lock);
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| 132 |
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| 133 | /* ------------------------- gl_rwlock_t datatype ------------------------- */
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| 134 |
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| 135 | typedef struct
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| 136 | {
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| 137 | int volatile init_needed;
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| 138 | once_flag init_once;
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| 139 | void (*init_func) (void);
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| 140 | mtx_t lock; /* protects the remaining fields */
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| 141 | cnd_t waiting_readers; /* waiting readers */
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| 142 | cnd_t waiting_writers; /* waiting writers */
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| 143 | unsigned int waiting_writers_count; /* number of waiting writers */
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| 144 | int runcount; /* number of readers running, or -1 when a writer runs */
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| 145 | }
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| 146 | gl_rwlock_t;
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| 147 | # define gl_rwlock_define(STORAGECLASS, NAME) \
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| 148 | STORAGECLASS gl_rwlock_t NAME;
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| 149 | # define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
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| 150 | static void _atomic_init_##NAME (void); \
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| 151 | STORAGECLASS gl_rwlock_t NAME = \
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| 152 | { 1, ONCE_FLAG_INIT, _atomic_init_##NAME }; \
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| 153 | static void _atomic_init_##NAME (void) \
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| 154 | { \
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| 155 | if (glthread_rwlock_init (&(NAME))) \
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| 156 | abort (); \
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| 157 | }
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| 158 | extern int glthread_rwlock_init (gl_rwlock_t *lock);
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| 159 | extern int glthread_rwlock_rdlock (gl_rwlock_t *lock);
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| 160 | extern int glthread_rwlock_wrlock (gl_rwlock_t *lock);
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| 161 | extern int glthread_rwlock_unlock (gl_rwlock_t *lock);
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| 162 | extern int glthread_rwlock_destroy (gl_rwlock_t *lock);
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| 163 |
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| 164 | /* --------------------- gl_recursive_lock_t datatype --------------------- */
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| 165 |
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| 166 | typedef struct
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| 167 | {
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| 168 | int volatile init_needed;
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| 169 | once_flag init_once;
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| 170 | void (*init_func) (void);
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| 171 | mtx_t mutex;
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| 172 | }
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| 173 | gl_recursive_lock_t;
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| 174 | # define gl_recursive_lock_define(STORAGECLASS, NAME) \
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| 175 | STORAGECLASS gl_recursive_lock_t NAME;
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| 176 | # define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
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| 177 | static void _atomic_init_##NAME (void); \
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| 178 | STORAGECLASS gl_recursive_lock_t NAME = \
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| 179 | { 1, ONCE_FLAG_INIT, _atomic_init_##NAME }; \
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| 180 | static void _atomic_init_##NAME (void) \
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| 181 | { \
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| 182 | if (glthread_recursive_lock_init (&(NAME))) \
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| 183 | abort (); \
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| 184 | }
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| 185 | extern int glthread_recursive_lock_init (gl_recursive_lock_t *lock);
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| 186 | extern int glthread_recursive_lock_lock (gl_recursive_lock_t *lock);
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| 187 | extern int glthread_recursive_lock_unlock (gl_recursive_lock_t *lock);
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| 188 | extern int glthread_recursive_lock_destroy (gl_recursive_lock_t *lock);
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| 189 |
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| 190 | /* -------------------------- gl_once_t datatype -------------------------- */
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| 191 |
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| 192 | typedef once_flag gl_once_t;
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| 193 | # define gl_once_define(STORAGECLASS, NAME) \
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| 194 | STORAGECLASS once_flag NAME = ONCE_FLAG_INIT;
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| 195 | # define glthread_once(ONCE_CONTROL, INITFUNCTION) \
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| 196 | (call_once (ONCE_CONTROL, INITFUNCTION), 0)
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| 197 |
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| 198 | # ifdef __cplusplus
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| 199 | }
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| 200 | # endif
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| 201 |
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| 202 | #endif
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| 203 |
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| 204 | /* ========================================================================= */
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| 205 |
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| 206 | #if USE_POSIX_THREADS
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| 207 |
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| 208 | /* Use the POSIX threads library. */
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| 209 |
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| 210 | # include <pthread.h>
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| 211 |
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| 212 | # ifdef __cplusplus
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| 213 | extern "C" {
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| 214 | # endif
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| 215 |
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| 216 | # if PTHREAD_IN_USE_DETECTION_HARD
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| 217 |
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| 218 | /* The pthread_in_use() detection needs to be done at runtime. */
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| 219 | # define pthread_in_use() \
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| 220 | glthread_in_use ()
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| 221 | extern int glthread_in_use (void);
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| 222 |
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| 223 | # endif
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| 224 |
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| 225 | # if USE_POSIX_THREADS_WEAK
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| 226 |
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| 227 | /* Use weak references to the POSIX threads library. */
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| 228 |
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| 229 | /* Weak references avoid dragging in external libraries if the other parts
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| 230 | of the program don't use them. Here we use them, because we don't want
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| 231 | every program that uses libintl to depend on libpthread. This assumes
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| 232 | that libpthread would not be loaded after libintl; i.e. if libintl is
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| 233 | loaded first, by an executable that does not depend on libpthread, and
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| 234 | then a module is dynamically loaded that depends on libpthread, libintl
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| 235 | will not be multithread-safe. */
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| 236 |
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| 237 | /* The way to test at runtime whether libpthread is present is to test
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| 238 | whether a function pointer's value, such as &pthread_mutex_init, is
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| 239 | non-NULL. However, some versions of GCC have a bug through which, in
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| 240 | PIC mode, &foo != NULL always evaluates to true if there is a direct
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| 241 | call to foo(...) in the same function. To avoid this, we test the
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| 242 | address of a function in libpthread that we don't use. */
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| 243 |
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| 244 | # pragma weak pthread_mutex_init
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| 245 | # pragma weak pthread_mutex_lock
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| 246 | # pragma weak pthread_mutex_unlock
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| 247 | # pragma weak pthread_mutex_destroy
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| 248 | # pragma weak pthread_rwlock_init
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| 249 | # pragma weak pthread_rwlock_rdlock
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| 250 | # pragma weak pthread_rwlock_wrlock
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| 251 | # pragma weak pthread_rwlock_unlock
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| 252 | # pragma weak pthread_rwlock_destroy
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| 253 | # pragma weak pthread_once
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| 254 | # pragma weak pthread_cond_init
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| 255 | # pragma weak pthread_cond_wait
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| 256 | # pragma weak pthread_cond_signal
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| 257 | # pragma weak pthread_cond_broadcast
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| 258 | # pragma weak pthread_cond_destroy
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| 259 | # pragma weak pthread_mutexattr_init
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| 260 | # pragma weak pthread_mutexattr_settype
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| 261 | # pragma weak pthread_mutexattr_destroy
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| 262 | # pragma weak pthread_rwlockattr_init
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| 263 | # if __GNU_LIBRARY__ > 1
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| 264 | # pragma weak pthread_rwlockattr_setkind_np
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| 265 | # endif
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| 266 | # pragma weak pthread_rwlockattr_destroy
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| 267 | # ifndef pthread_self
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| 268 | # pragma weak pthread_self
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| 269 | # endif
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| 270 |
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| 271 | # if !PTHREAD_IN_USE_DETECTION_HARD
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| 272 | /* Considering all platforms with USE_POSIX_THREADS_WEAK, only few symbols
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| 273 | can be used to determine whether libpthread is in use. These are:
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| 274 | pthread_mutexattr_gettype
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| 275 | pthread_rwlockattr_destroy
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| 276 | pthread_rwlockattr_init
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| 277 | */
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| 278 | # pragma weak pthread_mutexattr_gettype
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| 279 | # define pthread_in_use() \
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| 280 | (pthread_mutexattr_gettype != NULL || c11_threads_in_use ())
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| 281 | # endif
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| 282 |
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| 283 | # else
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| 284 |
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| 285 | # if !PTHREAD_IN_USE_DETECTION_HARD
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| 286 | # define pthread_in_use() 1
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| 287 | # endif
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| 288 |
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| 289 | # endif
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| 290 |
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| 291 | /* -------------------------- gl_lock_t datatype -------------------------- */
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| 292 |
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| 293 | typedef pthread_mutex_t gl_lock_t;
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| 294 | # define gl_lock_define(STORAGECLASS, NAME) \
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| 295 | STORAGECLASS pthread_mutex_t NAME;
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| 296 | # define gl_lock_define_initialized(STORAGECLASS, NAME) \
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| 297 | STORAGECLASS pthread_mutex_t NAME = gl_lock_initializer;
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| 298 | # define gl_lock_initializer \
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| 299 | PTHREAD_MUTEX_INITIALIZER
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| 300 | # define glthread_lock_init(LOCK) \
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| 301 | (pthread_in_use () ? pthread_mutex_init (LOCK, NULL) : 0)
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| 302 | # define glthread_lock_lock(LOCK) \
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| 303 | (pthread_in_use () ? pthread_mutex_lock (LOCK) : 0)
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| 304 | # define glthread_lock_unlock(LOCK) \
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| 305 | (pthread_in_use () ? pthread_mutex_unlock (LOCK) : 0)
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| 306 | # define glthread_lock_destroy(LOCK) \
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| 307 | (pthread_in_use () ? pthread_mutex_destroy (LOCK) : 0)
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| 308 |
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| 309 | /* ------------------------- gl_rwlock_t datatype ------------------------- */
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| 310 |
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| 311 | # if HAVE_PTHREAD_RWLOCK && (HAVE_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER || (defined PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP && (__GNU_LIBRARY__ > 1)))
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| 312 |
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| 313 | # if defined PTHREAD_RWLOCK_INITIALIZER || defined PTHREAD_RWLOCK_INITIALIZER_NP
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| 314 |
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| 315 | typedef pthread_rwlock_t gl_rwlock_t;
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| 316 | # define gl_rwlock_define(STORAGECLASS, NAME) \
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| 317 | STORAGECLASS pthread_rwlock_t NAME;
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| 318 | # define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
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| 319 | STORAGECLASS pthread_rwlock_t NAME = gl_rwlock_initializer;
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| 320 | # if HAVE_PTHREAD_RWLOCK_RDLOCK_PREFER_WRITER
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| 321 | # if defined PTHREAD_RWLOCK_INITIALIZER
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| 322 | # define gl_rwlock_initializer \
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| 323 | PTHREAD_RWLOCK_INITIALIZER
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| 324 | # else
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| 325 | # define gl_rwlock_initializer \
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| 326 | PTHREAD_RWLOCK_INITIALIZER_NP
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| 327 | # endif
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| 328 | # define glthread_rwlock_init(LOCK) \
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| 329 | (pthread_in_use () ? pthread_rwlock_init (LOCK, NULL) : 0)
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| 330 | # else /* glibc with bug https://sourceware.org/bugzilla/show_bug.cgi?id=13701 */
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| 331 | # define gl_rwlock_initializer \
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| 332 | PTHREAD_RWLOCK_WRITER_NONRECURSIVE_INITIALIZER_NP
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| 333 | # define glthread_rwlock_init(LOCK) \
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| 334 | (pthread_in_use () ? glthread_rwlock_init_for_glibc (LOCK) : 0)
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| 335 | extern int glthread_rwlock_init_for_glibc (pthread_rwlock_t *lock);
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| 336 | # endif
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| 337 | # define glthread_rwlock_rdlock(LOCK) \
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| 338 | (pthread_in_use () ? pthread_rwlock_rdlock (LOCK) : 0)
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| 339 | # define glthread_rwlock_wrlock(LOCK) \
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| 340 | (pthread_in_use () ? pthread_rwlock_wrlock (LOCK) : 0)
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| 341 | # define glthread_rwlock_unlock(LOCK) \
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| 342 | (pthread_in_use () ? pthread_rwlock_unlock (LOCK) : 0)
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| 343 | # define glthread_rwlock_destroy(LOCK) \
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| 344 | (pthread_in_use () ? pthread_rwlock_destroy (LOCK) : 0)
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| 345 |
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| 346 | # else
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| 347 |
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| 348 | typedef struct
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| 349 | {
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| 350 | int initialized;
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| 351 | pthread_mutex_t guard; /* protects the initialization */
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| 352 | pthread_rwlock_t rwlock; /* read-write lock */
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| 353 | }
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| 354 | gl_rwlock_t;
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| 355 | # define gl_rwlock_define(STORAGECLASS, NAME) \
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| 356 | STORAGECLASS gl_rwlock_t NAME;
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| 357 | # define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
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| 358 | STORAGECLASS gl_rwlock_t NAME = gl_rwlock_initializer;
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| 359 | # define gl_rwlock_initializer \
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| 360 | { 0, PTHREAD_MUTEX_INITIALIZER }
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| 361 | # define glthread_rwlock_init(LOCK) \
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| 362 | (pthread_in_use () ? glthread_rwlock_init_multithreaded (LOCK) : 0)
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| 363 | # define glthread_rwlock_rdlock(LOCK) \
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| 364 | (pthread_in_use () ? glthread_rwlock_rdlock_multithreaded (LOCK) : 0)
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| 365 | # define glthread_rwlock_wrlock(LOCK) \
|
|---|
| 366 | (pthread_in_use () ? glthread_rwlock_wrlock_multithreaded (LOCK) : 0)
|
|---|
| 367 | # define glthread_rwlock_unlock(LOCK) \
|
|---|
| 368 | (pthread_in_use () ? glthread_rwlock_unlock_multithreaded (LOCK) : 0)
|
|---|
| 369 | # define glthread_rwlock_destroy(LOCK) \
|
|---|
| 370 | (pthread_in_use () ? glthread_rwlock_destroy_multithreaded (LOCK) : 0)
|
|---|
| 371 | extern int glthread_rwlock_init_multithreaded (gl_rwlock_t *lock);
|
|---|
| 372 | extern int glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock);
|
|---|
| 373 | extern int glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock);
|
|---|
| 374 | extern int glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock);
|
|---|
| 375 | extern int glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock);
|
|---|
| 376 |
|
|---|
| 377 | # endif
|
|---|
| 378 |
|
|---|
| 379 | # else
|
|---|
| 380 |
|
|---|
| 381 | typedef struct
|
|---|
| 382 | {
|
|---|
| 383 | pthread_mutex_t lock; /* protects the remaining fields */
|
|---|
| 384 | pthread_cond_t waiting_readers; /* waiting readers */
|
|---|
| 385 | pthread_cond_t waiting_writers; /* waiting writers */
|
|---|
| 386 | unsigned int waiting_writers_count; /* number of waiting writers */
|
|---|
| 387 | int runcount; /* number of readers running, or -1 when a writer runs */
|
|---|
| 388 | }
|
|---|
| 389 | gl_rwlock_t;
|
|---|
| 390 | # define gl_rwlock_define(STORAGECLASS, NAME) \
|
|---|
| 391 | STORAGECLASS gl_rwlock_t NAME;
|
|---|
| 392 | # define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
|
|---|
| 393 | STORAGECLASS gl_rwlock_t NAME = gl_rwlock_initializer;
|
|---|
| 394 | # define gl_rwlock_initializer \
|
|---|
| 395 | { PTHREAD_MUTEX_INITIALIZER, PTHREAD_COND_INITIALIZER, PTHREAD_COND_INITIALIZER, 0, 0 }
|
|---|
| 396 | # define glthread_rwlock_init(LOCK) \
|
|---|
| 397 | (pthread_in_use () ? glthread_rwlock_init_multithreaded (LOCK) : 0)
|
|---|
| 398 | # define glthread_rwlock_rdlock(LOCK) \
|
|---|
| 399 | (pthread_in_use () ? glthread_rwlock_rdlock_multithreaded (LOCK) : 0)
|
|---|
| 400 | # define glthread_rwlock_wrlock(LOCK) \
|
|---|
| 401 | (pthread_in_use () ? glthread_rwlock_wrlock_multithreaded (LOCK) : 0)
|
|---|
| 402 | # define glthread_rwlock_unlock(LOCK) \
|
|---|
| 403 | (pthread_in_use () ? glthread_rwlock_unlock_multithreaded (LOCK) : 0)
|
|---|
| 404 | # define glthread_rwlock_destroy(LOCK) \
|
|---|
| 405 | (pthread_in_use () ? glthread_rwlock_destroy_multithreaded (LOCK) : 0)
|
|---|
| 406 | extern int glthread_rwlock_init_multithreaded (gl_rwlock_t *lock);
|
|---|
| 407 | extern int glthread_rwlock_rdlock_multithreaded (gl_rwlock_t *lock);
|
|---|
| 408 | extern int glthread_rwlock_wrlock_multithreaded (gl_rwlock_t *lock);
|
|---|
| 409 | extern int glthread_rwlock_unlock_multithreaded (gl_rwlock_t *lock);
|
|---|
| 410 | extern int glthread_rwlock_destroy_multithreaded (gl_rwlock_t *lock);
|
|---|
| 411 |
|
|---|
| 412 | # endif
|
|---|
| 413 |
|
|---|
| 414 | /* --------------------- gl_recursive_lock_t datatype --------------------- */
|
|---|
| 415 |
|
|---|
| 416 | # if HAVE_PTHREAD_MUTEX_RECURSIVE
|
|---|
| 417 |
|
|---|
| 418 | # if defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER || defined PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
|
|---|
| 419 |
|
|---|
| 420 | typedef pthread_mutex_t gl_recursive_lock_t;
|
|---|
| 421 | # define gl_recursive_lock_define(STORAGECLASS, NAME) \
|
|---|
| 422 | STORAGECLASS pthread_mutex_t NAME;
|
|---|
| 423 | # define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
|
|---|
| 424 | STORAGECLASS pthread_mutex_t NAME = gl_recursive_lock_initializer;
|
|---|
| 425 | # ifdef PTHREAD_RECURSIVE_MUTEX_INITIALIZER
|
|---|
| 426 | # define gl_recursive_lock_initializer \
|
|---|
| 427 | PTHREAD_RECURSIVE_MUTEX_INITIALIZER
|
|---|
| 428 | # else
|
|---|
| 429 | # define gl_recursive_lock_initializer \
|
|---|
| 430 | PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP
|
|---|
| 431 | # endif
|
|---|
| 432 | # define glthread_recursive_lock_init(LOCK) \
|
|---|
| 433 | (pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
|
|---|
| 434 | # define glthread_recursive_lock_lock(LOCK) \
|
|---|
| 435 | (pthread_in_use () ? pthread_mutex_lock (LOCK) : 0)
|
|---|
| 436 | # define glthread_recursive_lock_unlock(LOCK) \
|
|---|
| 437 | (pthread_in_use () ? pthread_mutex_unlock (LOCK) : 0)
|
|---|
| 438 | # define glthread_recursive_lock_destroy(LOCK) \
|
|---|
| 439 | (pthread_in_use () ? pthread_mutex_destroy (LOCK) : 0)
|
|---|
| 440 | extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
|
|---|
| 441 |
|
|---|
| 442 | # else
|
|---|
| 443 |
|
|---|
| 444 | typedef struct
|
|---|
| 445 | {
|
|---|
| 446 | pthread_mutex_t recmutex; /* recursive mutex */
|
|---|
| 447 | pthread_mutex_t guard; /* protects the initialization */
|
|---|
| 448 | int initialized;
|
|---|
| 449 | }
|
|---|
| 450 | gl_recursive_lock_t;
|
|---|
| 451 | # define gl_recursive_lock_define(STORAGECLASS, NAME) \
|
|---|
| 452 | STORAGECLASS gl_recursive_lock_t NAME;
|
|---|
| 453 | # define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
|
|---|
| 454 | STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
|
|---|
| 455 | # define gl_recursive_lock_initializer \
|
|---|
| 456 | { PTHREAD_MUTEX_INITIALIZER, PTHREAD_MUTEX_INITIALIZER, 0 }
|
|---|
| 457 | # define glthread_recursive_lock_init(LOCK) \
|
|---|
| 458 | (pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
|
|---|
| 459 | # define glthread_recursive_lock_lock(LOCK) \
|
|---|
| 460 | (pthread_in_use () ? glthread_recursive_lock_lock_multithreaded (LOCK) : 0)
|
|---|
| 461 | # define glthread_recursive_lock_unlock(LOCK) \
|
|---|
| 462 | (pthread_in_use () ? glthread_recursive_lock_unlock_multithreaded (LOCK) : 0)
|
|---|
| 463 | # define glthread_recursive_lock_destroy(LOCK) \
|
|---|
| 464 | (pthread_in_use () ? glthread_recursive_lock_destroy_multithreaded (LOCK) : 0)
|
|---|
| 465 | extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
|
|---|
| 466 | extern int glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock);
|
|---|
| 467 | extern int glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock);
|
|---|
| 468 | extern int glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock);
|
|---|
| 469 |
|
|---|
| 470 | # endif
|
|---|
| 471 |
|
|---|
| 472 | # else
|
|---|
| 473 |
|
|---|
| 474 | /* Old versions of POSIX threads on Solaris did not have recursive locks.
|
|---|
| 475 | We have to implement them ourselves. */
|
|---|
| 476 |
|
|---|
| 477 | typedef struct
|
|---|
| 478 | {
|
|---|
| 479 | pthread_mutex_t mutex;
|
|---|
| 480 | pthread_t owner;
|
|---|
| 481 | unsigned long depth;
|
|---|
| 482 | }
|
|---|
| 483 | gl_recursive_lock_t;
|
|---|
| 484 | # define gl_recursive_lock_define(STORAGECLASS, NAME) \
|
|---|
| 485 | STORAGECLASS gl_recursive_lock_t NAME;
|
|---|
| 486 | # define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
|
|---|
| 487 | STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
|
|---|
| 488 | # define gl_recursive_lock_initializer \
|
|---|
| 489 | { PTHREAD_MUTEX_INITIALIZER, (pthread_t) 0, 0 }
|
|---|
| 490 | # define glthread_recursive_lock_init(LOCK) \
|
|---|
| 491 | (pthread_in_use () ? glthread_recursive_lock_init_multithreaded (LOCK) : 0)
|
|---|
| 492 | # define glthread_recursive_lock_lock(LOCK) \
|
|---|
| 493 | (pthread_in_use () ? glthread_recursive_lock_lock_multithreaded (LOCK) : 0)
|
|---|
| 494 | # define glthread_recursive_lock_unlock(LOCK) \
|
|---|
| 495 | (pthread_in_use () ? glthread_recursive_lock_unlock_multithreaded (LOCK) : 0)
|
|---|
| 496 | # define glthread_recursive_lock_destroy(LOCK) \
|
|---|
| 497 | (pthread_in_use () ? glthread_recursive_lock_destroy_multithreaded (LOCK) : 0)
|
|---|
| 498 | extern int glthread_recursive_lock_init_multithreaded (gl_recursive_lock_t *lock);
|
|---|
| 499 | extern int glthread_recursive_lock_lock_multithreaded (gl_recursive_lock_t *lock);
|
|---|
| 500 | extern int glthread_recursive_lock_unlock_multithreaded (gl_recursive_lock_t *lock);
|
|---|
| 501 | extern int glthread_recursive_lock_destroy_multithreaded (gl_recursive_lock_t *lock);
|
|---|
| 502 |
|
|---|
| 503 | # endif
|
|---|
| 504 |
|
|---|
| 505 | /* -------------------------- gl_once_t datatype -------------------------- */
|
|---|
| 506 |
|
|---|
| 507 | typedef pthread_once_t gl_once_t;
|
|---|
| 508 | # define gl_once_define(STORAGECLASS, NAME) \
|
|---|
| 509 | STORAGECLASS pthread_once_t NAME = PTHREAD_ONCE_INIT;
|
|---|
| 510 | # if PTHREAD_IN_USE_DETECTION_HARD || USE_POSIX_THREADS_WEAK
|
|---|
| 511 | # define glthread_once(ONCE_CONTROL, INITFUNCTION) \
|
|---|
| 512 | (pthread_in_use () \
|
|---|
| 513 | ? pthread_once (ONCE_CONTROL, INITFUNCTION) \
|
|---|
| 514 | : (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
|
|---|
| 515 | # else
|
|---|
| 516 | # define glthread_once(ONCE_CONTROL, INITFUNCTION) \
|
|---|
| 517 | (pthread_in_use () \
|
|---|
| 518 | ? glthread_once_multithreaded (ONCE_CONTROL, INITFUNCTION) \
|
|---|
| 519 | : (glthread_once_singlethreaded (ONCE_CONTROL) ? (INITFUNCTION (), 0) : 0))
|
|---|
| 520 | extern int glthread_once_multithreaded (pthread_once_t *once_control,
|
|---|
| 521 | void (*init_function) (void));
|
|---|
| 522 | # endif
|
|---|
| 523 | extern int glthread_once_singlethreaded (pthread_once_t *once_control);
|
|---|
| 524 |
|
|---|
| 525 | # ifdef __cplusplus
|
|---|
| 526 | }
|
|---|
| 527 | # endif
|
|---|
| 528 |
|
|---|
| 529 | #endif
|
|---|
| 530 |
|
|---|
| 531 | /* ========================================================================= */
|
|---|
| 532 |
|
|---|
| 533 | #if USE_WINDOWS_THREADS
|
|---|
| 534 |
|
|---|
| 535 | # define WIN32_LEAN_AND_MEAN /* avoid including junk */
|
|---|
| 536 | # include <windows.h>
|
|---|
| 537 |
|
|---|
| 538 | # include "windows-mutex.h"
|
|---|
| 539 | # include "windows-rwlock.h"
|
|---|
| 540 | # include "windows-recmutex.h"
|
|---|
| 541 | # include "windows-once.h"
|
|---|
| 542 |
|
|---|
| 543 | # ifdef __cplusplus
|
|---|
| 544 | extern "C" {
|
|---|
| 545 | # endif
|
|---|
| 546 |
|
|---|
| 547 | /* We can use CRITICAL_SECTION directly, rather than the native Windows Event,
|
|---|
| 548 | Mutex, Semaphore types, because
|
|---|
| 549 | - we need only to synchronize inside a single process (address space),
|
|---|
| 550 | not inter-process locking,
|
|---|
| 551 | - we don't need to support trylock operations. (TryEnterCriticalSection
|
|---|
| 552 | does not work on Windows 95/98/ME. Packages that need trylock usually
|
|---|
| 553 | define their own mutex type.) */
|
|---|
| 554 |
|
|---|
| 555 | /* There is no way to statically initialize a CRITICAL_SECTION. It needs
|
|---|
| 556 | to be done lazily, once only. For this we need spinlocks. */
|
|---|
| 557 |
|
|---|
| 558 | /* -------------------------- gl_lock_t datatype -------------------------- */
|
|---|
| 559 |
|
|---|
| 560 | typedef glwthread_mutex_t gl_lock_t;
|
|---|
| 561 | # define gl_lock_define(STORAGECLASS, NAME) \
|
|---|
| 562 | STORAGECLASS gl_lock_t NAME;
|
|---|
| 563 | # define gl_lock_define_initialized(STORAGECLASS, NAME) \
|
|---|
| 564 | STORAGECLASS gl_lock_t NAME = gl_lock_initializer;
|
|---|
| 565 | # define gl_lock_initializer \
|
|---|
| 566 | GLWTHREAD_MUTEX_INIT
|
|---|
| 567 | # define glthread_lock_init(LOCK) \
|
|---|
| 568 | (glwthread_mutex_init (LOCK), 0)
|
|---|
| 569 | # define glthread_lock_lock(LOCK) \
|
|---|
| 570 | glwthread_mutex_lock (LOCK)
|
|---|
| 571 | # define glthread_lock_unlock(LOCK) \
|
|---|
| 572 | glwthread_mutex_unlock (LOCK)
|
|---|
| 573 | # define glthread_lock_destroy(LOCK) \
|
|---|
| 574 | glwthread_mutex_destroy (LOCK)
|
|---|
| 575 |
|
|---|
| 576 | /* ------------------------- gl_rwlock_t datatype ------------------------- */
|
|---|
| 577 |
|
|---|
| 578 | typedef glwthread_rwlock_t gl_rwlock_t;
|
|---|
| 579 | # define gl_rwlock_define(STORAGECLASS, NAME) \
|
|---|
| 580 | STORAGECLASS gl_rwlock_t NAME;
|
|---|
| 581 | # define gl_rwlock_define_initialized(STORAGECLASS, NAME) \
|
|---|
| 582 | STORAGECLASS gl_rwlock_t NAME = gl_rwlock_initializer;
|
|---|
| 583 | # define gl_rwlock_initializer \
|
|---|
| 584 | GLWTHREAD_RWLOCK_INIT
|
|---|
| 585 | # define glthread_rwlock_init(LOCK) \
|
|---|
| 586 | (glwthread_rwlock_init (LOCK), 0)
|
|---|
| 587 | # define glthread_rwlock_rdlock(LOCK) \
|
|---|
| 588 | glwthread_rwlock_rdlock (LOCK)
|
|---|
| 589 | # define glthread_rwlock_wrlock(LOCK) \
|
|---|
| 590 | glwthread_rwlock_wrlock (LOCK)
|
|---|
| 591 | # define glthread_rwlock_unlock(LOCK) \
|
|---|
| 592 | glwthread_rwlock_unlock (LOCK)
|
|---|
| 593 | # define glthread_rwlock_destroy(LOCK) \
|
|---|
| 594 | glwthread_rwlock_destroy (LOCK)
|
|---|
| 595 |
|
|---|
| 596 | /* --------------------- gl_recursive_lock_t datatype --------------------- */
|
|---|
| 597 |
|
|---|
| 598 | typedef glwthread_recmutex_t gl_recursive_lock_t;
|
|---|
| 599 | # define gl_recursive_lock_define(STORAGECLASS, NAME) \
|
|---|
| 600 | STORAGECLASS gl_recursive_lock_t NAME;
|
|---|
| 601 | # define gl_recursive_lock_define_initialized(STORAGECLASS, NAME) \
|
|---|
| 602 | STORAGECLASS gl_recursive_lock_t NAME = gl_recursive_lock_initializer;
|
|---|
| 603 | # define gl_recursive_lock_initializer \
|
|---|
| 604 | GLWTHREAD_RECMUTEX_INIT
|
|---|
| 605 | # define glthread_recursive_lock_init(LOCK) \
|
|---|
| 606 | (glwthread_recmutex_init (LOCK), 0)
|
|---|
| 607 | # define glthread_recursive_lock_lock(LOCK) \
|
|---|
| 608 | glwthread_recmutex_lock (LOCK)
|
|---|
| 609 | # define glthread_recursive_lock_unlock(LOCK) \
|
|---|
| 610 | glwthread_recmutex_unlock (LOCK)
|
|---|
| 611 | # define glthread_recursive_lock_destroy(LOCK) \
|
|---|
| 612 | glwthread_recmutex_destroy (LOCK)
|
|---|
| 613 |
|
|---|
| 614 | /* -------------------------- gl_once_t datatype -------------------------- */
|
|---|
| 615 |
|
|---|
| 616 | typedef glwthread_once_t gl_once_t;
|
|---|
| 617 | # define gl_once_define(STORAGECLASS, NAME) \
|
|---|
| 618 | STORAGECLASS gl_once_t NAME = GLWTHREAD_ONCE_INIT;
|
|---|
| 619 | # define glthread_once(ONCE_CONTROL, INITFUNCTION) \
|
|---|
| 620 | (glwthread_once (ONCE_CONTROL, INITFUNCTION), 0)
|
|---|
| 621 |
|
|---|
| 622 | # ifdef __cplusplus
|
|---|
| 623 | }
|
|---|
| 624 | # endif
|
|---|
| 625 |
|
|---|
| 626 | #endif
|
|---|
| 627 |
|
|---|
| 628 | /* ========================================================================= */
|
|---|
| 629 |
|
|---|
| 630 | #if !(USE_ISOC_THREADS || USE_POSIX_THREADS || USE_ISOC_AND_POSIX_THREADS || USE_WINDOWS_THREADS)
|
|---|
| 631 |
|
|---|
| 632 | /* Provide dummy implementation if threads are not supported. */
|
|---|
| 633 |
|
|---|
| 634 | /* -------------------------- gl_lock_t datatype -------------------------- */
|
|---|
| 635 |
|
|---|
| 636 | typedef int gl_lock_t;
|
|---|
| 637 | # define gl_lock_define(STORAGECLASS, NAME)
|
|---|
| 638 | # define gl_lock_define_initialized(STORAGECLASS, NAME)
|
|---|
| 639 | # define glthread_lock_init(NAME) 0
|
|---|
| 640 | # define glthread_lock_lock(NAME) 0
|
|---|
| 641 | # define glthread_lock_unlock(NAME) 0
|
|---|
| 642 | # define glthread_lock_destroy(NAME) 0
|
|---|
| 643 |
|
|---|
| 644 | /* ------------------------- gl_rwlock_t datatype ------------------------- */
|
|---|
| 645 |
|
|---|
| 646 | typedef int gl_rwlock_t;
|
|---|
| 647 | # define gl_rwlock_define(STORAGECLASS, NAME)
|
|---|
| 648 | # define gl_rwlock_define_initialized(STORAGECLASS, NAME)
|
|---|
| 649 | # define glthread_rwlock_init(NAME) 0
|
|---|
| 650 | # define glthread_rwlock_rdlock(NAME) 0
|
|---|
| 651 | # define glthread_rwlock_wrlock(NAME) 0
|
|---|
| 652 | # define glthread_rwlock_unlock(NAME) 0
|
|---|
| 653 | # define glthread_rwlock_destroy(NAME) 0
|
|---|
| 654 |
|
|---|
| 655 | /* --------------------- gl_recursive_lock_t datatype --------------------- */
|
|---|
| 656 |
|
|---|
| 657 | typedef int gl_recursive_lock_t;
|
|---|
| 658 | # define gl_recursive_lock_define(STORAGECLASS, NAME)
|
|---|
| 659 | # define gl_recursive_lock_define_initialized(STORAGECLASS, NAME)
|
|---|
| 660 | # define glthread_recursive_lock_init(NAME) 0
|
|---|
| 661 | # define glthread_recursive_lock_lock(NAME) 0
|
|---|
| 662 | # define glthread_recursive_lock_unlock(NAME) 0
|
|---|
| 663 | # define glthread_recursive_lock_destroy(NAME) 0
|
|---|
| 664 |
|
|---|
| 665 | /* -------------------------- gl_once_t datatype -------------------------- */
|
|---|
| 666 |
|
|---|
| 667 | typedef int gl_once_t;
|
|---|
| 668 | # define gl_once_define(STORAGECLASS, NAME) \
|
|---|
| 669 | STORAGECLASS gl_once_t NAME = 0;
|
|---|
| 670 | # define glthread_once(ONCE_CONTROL, INITFUNCTION) \
|
|---|
| 671 | (*(ONCE_CONTROL) == 0 ? (*(ONCE_CONTROL) = ~ 0, INITFUNCTION (), 0) : 0)
|
|---|
| 672 |
|
|---|
| 673 | #endif
|
|---|
| 674 |
|
|---|
| 675 | /* ========================================================================= */
|
|---|
| 676 |
|
|---|
| 677 | /* Macros with built-in error handling. */
|
|---|
| 678 |
|
|---|
| 679 | /* -------------------------- gl_lock_t datatype -------------------------- */
|
|---|
| 680 |
|
|---|
| 681 | #define gl_lock_init(NAME) \
|
|---|
| 682 | do \
|
|---|
| 683 | { \
|
|---|
| 684 | if (glthread_lock_init (&NAME)) \
|
|---|
| 685 | abort (); \
|
|---|
| 686 | } \
|
|---|
| 687 | while (0)
|
|---|
| 688 | #define gl_lock_lock(NAME) \
|
|---|
| 689 | do \
|
|---|
| 690 | { \
|
|---|
| 691 | if (glthread_lock_lock (&NAME)) \
|
|---|
| 692 | abort (); \
|
|---|
| 693 | } \
|
|---|
| 694 | while (0)
|
|---|
| 695 | #define gl_lock_unlock(NAME) \
|
|---|
| 696 | do \
|
|---|
| 697 | { \
|
|---|
| 698 | if (glthread_lock_unlock (&NAME)) \
|
|---|
| 699 | abort (); \
|
|---|
| 700 | } \
|
|---|
| 701 | while (0)
|
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| 702 | #define gl_lock_destroy(NAME) \
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| 703 | do \
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| 704 | { \
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| 705 | if (glthread_lock_destroy (&NAME)) \
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| 706 | abort (); \
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| 707 | } \
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| 708 | while (0)
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| 709 |
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| 710 | /* ------------------------- gl_rwlock_t datatype ------------------------- */
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| 711 |
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| 712 | #define gl_rwlock_init(NAME) \
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| 713 | do \
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| 714 | { \
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| 715 | if (glthread_rwlock_init (&NAME)) \
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| 716 | abort (); \
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| 717 | } \
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| 718 | while (0)
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| 719 | #define gl_rwlock_rdlock(NAME) \
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| 720 | do \
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| 721 | { \
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| 722 | if (glthread_rwlock_rdlock (&NAME)) \
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| 723 | abort (); \
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| 724 | } \
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| 725 | while (0)
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| 726 | #define gl_rwlock_wrlock(NAME) \
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| 727 | do \
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| 728 | { \
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| 729 | if (glthread_rwlock_wrlock (&NAME)) \
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|---|
| 730 | abort (); \
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|---|
| 731 | } \
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| 732 | while (0)
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| 733 | #define gl_rwlock_unlock(NAME) \
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| 734 | do \
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| 735 | { \
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| 736 | if (glthread_rwlock_unlock (&NAME)) \
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| 737 | abort (); \
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| 738 | } \
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| 739 | while (0)
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|---|
| 740 | #define gl_rwlock_destroy(NAME) \
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|---|
| 741 | do \
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| 742 | { \
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| 743 | if (glthread_rwlock_destroy (&NAME)) \
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| 744 | abort (); \
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| 745 | } \
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| 746 | while (0)
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|---|
| 747 |
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|---|
| 748 | /* --------------------- gl_recursive_lock_t datatype --------------------- */
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|---|
| 749 |
|
|---|
| 750 | #define gl_recursive_lock_init(NAME) \
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|---|
| 751 | do \
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|---|
| 752 | { \
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|---|
| 753 | if (glthread_recursive_lock_init (&NAME)) \
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|---|
| 754 | abort (); \
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|---|
| 755 | } \
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|---|
| 756 | while (0)
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|---|
| 757 | #define gl_recursive_lock_lock(NAME) \
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|---|
| 758 | do \
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|---|
| 759 | { \
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|---|
| 760 | if (glthread_recursive_lock_lock (&NAME)) \
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|---|
| 761 | abort (); \
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|---|
| 762 | } \
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|---|
| 763 | while (0)
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|---|
| 764 | #define gl_recursive_lock_unlock(NAME) \
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|---|
| 765 | do \
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|---|
| 766 | { \
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|---|
| 767 | if (glthread_recursive_lock_unlock (&NAME)) \
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|---|
| 768 | abort (); \
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|---|
| 769 | } \
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|---|
| 770 | while (0)
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| 771 | #define gl_recursive_lock_destroy(NAME) \
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|---|
| 772 | do \
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|---|
| 773 | { \
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|---|
| 774 | if (glthread_recursive_lock_destroy (&NAME)) \
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|---|
| 775 | abort (); \
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|---|
| 776 | } \
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| 777 | while (0)
|
|---|
| 778 |
|
|---|
| 779 | /* -------------------------- gl_once_t datatype -------------------------- */
|
|---|
| 780 |
|
|---|
| 781 | #define gl_once(NAME, INITFUNCTION) \
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|---|
| 782 | do \
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|---|
| 783 | { \
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|---|
| 784 | if (glthread_once (&NAME, INITFUNCTION)) \
|
|---|
| 785 | abort (); \
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|---|
| 786 | } \
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|---|
| 787 | while (0)
|
|---|
| 788 |
|
|---|
| 789 | /* ========================================================================= */
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|---|
| 790 |
|
|---|
| 791 | #endif /* _LOCK_H */
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