| 1 | /** @file
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| 2 | * IPRT - Critical Sections.
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| 3 | */
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| 4 |
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| 5 | /*
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| 6 | * Copyright (C) 2006-2023 Oracle and/or its affiliates.
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| 7 | *
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| 8 | * This file is part of VirtualBox base platform packages, as
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| 9 | * available from https://www.virtualbox.org.
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| 10 | *
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| 11 | * This program is free software; you can redistribute it and/or
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| 12 | * modify it under the terms of the GNU General Public License
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| 13 | * as published by the Free Software Foundation, in version 3 of the
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| 14 | * License.
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| 15 | *
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| 16 | * This program is distributed in the hope that it will be useful, but
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| 17 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 19 | * General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 23 | *
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| 24 | * The contents of this file may alternatively be used under the terms
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| 25 | * of the Common Development and Distribution License Version 1.0
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| 26 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 27 | * in the VirtualBox distribution, in which case the provisions of the
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| 28 | * CDDL are applicable instead of those of the GPL.
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| 29 | *
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| 30 | * You may elect to license modified versions of this file under the
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| 31 | * terms and conditions of either the GPL or the CDDL or both.
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| 32 | *
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| 33 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 34 | */
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| 35 |
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| 36 | #ifndef IPRT_INCLUDED_critsect_h
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| 37 | #define IPRT_INCLUDED_critsect_h
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| 38 | #ifndef RT_WITHOUT_PRAGMA_ONCE
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| 39 | # pragma once
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| 40 | #endif
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| 41 |
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| 42 | #include <iprt/cdefs.h>
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| 43 | #include <iprt/types.h>
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| 44 | #include <iprt/assert.h>
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| 45 | #if defined(IN_RING3) || defined(IN_RING0)
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| 46 | # include <iprt/thread.h>
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| 47 | #endif
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| 48 | #ifdef RT_LOCK_STRICT_ORDER
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| 49 | # include <iprt/lockvalidator.h>
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| 50 | #endif
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| 51 |
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| 52 | RT_C_DECLS_BEGIN
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| 53 |
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| 54 | /** @defgroup grp_rt_critsect RTCritSect - Critical Sections
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| 55 | *
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| 56 | * "Critical section" synchronization primitives can be used to
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| 57 | * protect a section of code or data to which access must be exclusive;
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| 58 | * only one thread can hold access to a critical section at one time.
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| 59 | *
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| 60 | * A critical section is a fast recursive write lock; if the critical
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| 61 | * section is not acquired, then entering it is fast (requires no system
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| 62 | * call). IPRT uses the Windows terminology here; on other platform, this
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| 63 | * might be called a "futex" or a "fast mutex". As opposed to IPRT
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| 64 | * "fast mutexes" (see @ref grp_rt_sems_fast_mutex ), critical sections
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| 65 | * are recursive.
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| 66 | *
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| 67 | * Use RTCritSectInit to initialize a critical section; use RTCritSectEnter
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| 68 | * and RTCritSectLeave to acquire and release access.
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| 69 | *
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| 70 | * For an overview of all types of synchronization primitives provided
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| 71 | * by IPRT (event, mutex/fast mutex/read-write mutex semaphores), see
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| 72 | * @ref grp_rt_sems .
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| 73 | *
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| 74 | * @ingroup grp_rt
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| 75 | * @{
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| 76 | */
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| 77 |
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| 78 | /**
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| 79 | * Critical section.
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| 80 | */
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| 81 | typedef struct RTCRITSECT
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| 82 | {
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| 83 | /** Magic used to validate the section state.
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| 84 | * RTCRITSECT_MAGIC is the value of an initialized & operational section. */
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| 85 | volatile uint32_t u32Magic;
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| 86 | /** Number of lockers.
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| 87 | * -1 if the section is free. */
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| 88 | volatile int32_t cLockers;
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| 89 | /** The owner thread. */
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| 90 | volatile RTNATIVETHREAD NativeThreadOwner;
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| 91 | /** Number of nested enter operations performed.
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| 92 | * Greater or equal to 1 if owned, 0 when free.
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| 93 | */
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| 94 | volatile int32_t cNestings;
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| 95 | /** Section flags - the RTCRITSECT_FLAGS_* \#defines. */
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| 96 | uint32_t fFlags;
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| 97 | /** The semaphore to block on. */
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| 98 | RTSEMEVENT EventSem;
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| 99 | /** Lock validator record. Only used in strict builds. */
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| 100 | R3R0PTRTYPE(PRTLOCKVALRECEXCL) pValidatorRec;
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| 101 | /** Alignment padding. */
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| 102 | RTHCPTR Alignment;
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| 103 | } RTCRITSECT;
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| 104 | AssertCompileSize(RTCRITSECT, HC_ARCH_BITS == 32 ? 32 : 48);
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| 105 |
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| 106 | /** RTCRITSECT::u32Magic value. (Hiromi Uehara) */
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| 107 | #define RTCRITSECT_MAGIC UINT32_C(0x19790326)
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| 108 |
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| 109 | /** @name RTCritSectInitEx flags / RTCRITSECT::fFlags
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| 110 | * @{ */
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| 111 | /** If set, nesting(/recursion) is not allowed. */
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| 112 | #define RTCRITSECT_FLAGS_NO_NESTING UINT32_C(0x00000001)
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| 113 | /** Disables lock validation. */
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| 114 | #define RTCRITSECT_FLAGS_NO_LOCK_VAL UINT32_C(0x00000002)
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| 115 | /** Bootstrap hack for use with certain memory allocator locks only! */
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| 116 | #define RTCRITSECT_FLAGS_BOOTSTRAP_HACK UINT32_C(0x00000004)
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| 117 | /** If set, the critical section becomes a dummy that doesn't serialize any
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| 118 | * threads. This flag can only be set at creation time.
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| 119 | *
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| 120 | * The intended use is avoiding lots of conditional code where some component
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| 121 | * might or might not require entering a critical section before access. */
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| 122 | #define RTCRITSECT_FLAGS_NOP UINT32_C(0x00000008)
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| 123 | /** Indicates that this is a ring-0 critical section. */
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| 124 | #define RTCRITSECT_FLAGS_RING0 UINT32_C(0x00000010)
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| 125 | /** @} */
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| 126 |
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| 127 |
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| 128 | #if defined(IN_RING3) || defined(IN_RING0)
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| 129 |
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| 130 | /**
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| 131 | * Initialize a critical section.
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| 132 | */
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| 133 | RTDECL(int) RTCritSectInit(PRTCRITSECT pCritSect);
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| 134 |
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| 135 | /**
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| 136 | * Initialize a critical section.
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| 137 | *
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| 138 | * @returns iprt status code.
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| 139 | * @param pCritSect Pointer to the critical section structure.
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| 140 | * @param fFlags Flags, any combination of the RTCRITSECT_FLAGS
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| 141 | * \#defines.
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| 142 | * @param hClass The class (no reference consumed). If NIL, no lock
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| 143 | * order validation will be performed on this lock.
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| 144 | * @param uSubClass The sub-class. This is used to define lock order
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| 145 | * within a class. RTLOCKVAL_SUB_CLASS_NONE is the
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| 146 | * recommended value here.
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| 147 | * @param pszNameFmt Name format string for the lock validator, optional
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| 148 | * (NULL). Max length is 32 bytes.
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| 149 | * @param ... Format string arguments.
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| 150 | */
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| 151 | RTDECL(int) RTCritSectInitEx(PRTCRITSECT pCritSect, uint32_t fFlags, RTLOCKVALCLASS hClass, uint32_t uSubClass,
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| 152 | const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(5, 6);
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| 153 |
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| 154 | /**
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| 155 | * Changes the lock validator sub-class of the critical section.
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| 156 | *
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| 157 | * It is recommended to try make sure that nobody is using this critical section
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| 158 | * while changing the value.
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| 159 | *
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| 160 | * @returns The old sub-class. RTLOCKVAL_SUB_CLASS_INVALID is returns if the
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| 161 | * lock validator isn't compiled in or either of the parameters are
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| 162 | * invalid.
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| 163 | * @param pCritSect The critical section.
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| 164 | * @param uSubClass The new sub-class value.
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| 165 | */
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| 166 | RTDECL(uint32_t) RTCritSectSetSubClass(PRTCRITSECT pCritSect, uint32_t uSubClass);
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| 167 |
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| 168 | /**
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| 169 | * Enter a critical section.
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| 170 | *
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| 171 | * @returns VINF_SUCCESS on success.
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| 172 | * @returns VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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| 173 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 174 | * during the operation.
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| 175 | * @param pCritSect The critical section.
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| 176 | */
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| 177 | RTDECL(int) RTCritSectEnter(PRTCRITSECT pCritSect);
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| 178 |
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| 179 | /**
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| 180 | * Enter a critical section.
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| 181 | *
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| 182 | * @returns IPRT status code.
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| 183 | * @retval VINF_SUCCESS on success.
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| 184 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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| 185 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 186 | * during the operation.
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| 187 | *
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| 188 | * @param pCritSect The critical section.
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| 189 | * @param uId Where we're entering the section.
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| 190 | * @param SRC_POS The source position where call is being made from.
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| 191 | * Use RT_SRC_POS when possible. Optional.
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| 192 | */
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| 193 | RTDECL(int) RTCritSectEnterDebug(PRTCRITSECT pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
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| 194 |
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| 195 | /**
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| 196 | * Try enter a critical section.
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| 197 | *
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| 198 | * @retval VINF_SUCCESS on success.
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| 199 | * @retval VERR_SEM_BUSY if the critsect was owned.
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| 200 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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| 201 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 202 | * during the operation.
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| 203 | *
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| 204 | * @param pCritSect The critical section.
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| 205 | */
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| 206 | RTDECL(int) RTCritSectTryEnter(PRTCRITSECT pCritSect);
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| 207 |
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| 208 | /**
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| 209 | * Try enter a critical section.
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| 210 | *
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| 211 | * @retval VINF_SUCCESS on success.
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| 212 | * @retval VERR_SEM_BUSY if the critsect was owned.
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| 213 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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| 214 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 215 | * during the operation.
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| 216 | *
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| 217 | * @param pCritSect The critical section.
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| 218 | * @param uId Where we're entering the section.
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| 219 | * @param SRC_POS The source position where call is being made from.
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| 220 | * Use RT_SRC_POS when possible. Optional.
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| 221 | */
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| 222 | RTDECL(int) RTCritSectTryEnterDebug(PRTCRITSECT pCritSect, RTHCUINTPTR uId, RT_SRC_POS_DECL);
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| 223 |
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| 224 | # ifdef IN_RING3 /* Crazy APIs: ring-3 only. */
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| 225 |
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| 226 | /**
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| 227 | * Enter multiple critical sections.
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| 228 | *
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| 229 | * This function will enter ALL the specified critical sections before returning.
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| 230 | *
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| 231 | * @returns VINF_SUCCESS on success.
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| 232 | * @returns VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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| 233 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 234 | * during the operation.
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| 235 | * @param cCritSects Number of critical sections in the array.
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| 236 | * @param papCritSects Array of critical section pointers.
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| 237 | *
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| 238 | * @remark Please note that this function will not necessarily come out favourable in a
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| 239 | * fight with other threads which are using the normal RTCritSectEnter() function.
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| 240 | * Therefore, avoid having to enter multiple critical sections!
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| 241 | */
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| 242 | RTDECL(int) RTCritSectEnterMultiple(size_t cCritSects, PRTCRITSECT *papCritSects);
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| 243 |
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| 244 | /**
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| 245 | * Enter multiple critical sections.
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| 246 | *
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| 247 | * This function will enter ALL the specified critical sections before returning.
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| 248 | *
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| 249 | * @returns VINF_SUCCESS on success.
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| 250 | * @returns VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
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| 251 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
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| 252 | * during the operation.
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| 253 | *
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| 254 | * @param cCritSects Number of critical sections in the array.
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| 255 | * @param papCritSects Array of critical section pointers.
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| 256 | * @param uId Where we're entering the section.
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| 257 | * @param SRC_POS The source position where call is being made from.
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| 258 | * Use RT_SRC_POS when possible. Optional.
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| 259 | *
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| 260 | * @remark See RTCritSectEnterMultiple().
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| 261 | */
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| 262 | RTDECL(int) RTCritSectEnterMultipleDebug(size_t cCritSects, PRTCRITSECT *papCritSects, RTHCUINTPTR uId, RT_SRC_POS_DECL);
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| 263 |
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| 264 | # endif /* IN_RING3 */
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| 265 |
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| 266 | /**
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| 267 | * Leave a critical section.
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| 268 | *
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| 269 | * @returns VINF_SUCCESS.
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| 270 | * @param pCritSect The critical section.
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| 271 | */
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| 272 | RTDECL(int) RTCritSectLeave(PRTCRITSECT pCritSect);
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| 273 |
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| 274 | /**
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| 275 | * Leave multiple critical sections.
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| 276 | *
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| 277 | * @returns VINF_SUCCESS.
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| 278 | * @param cCritSects Number of critical sections in the array.
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| 279 | * @param papCritSects Array of critical section pointers.
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| 280 | */
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| 281 | RTDECL(int) RTCritSectLeaveMultiple(size_t cCritSects, PRTCRITSECT *papCritSects);
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| 282 |
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| 283 | /**
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| 284 | * Deletes a critical section.
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| 285 | *
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| 286 | * @returns VINF_SUCCESS.
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| 287 | * @param pCritSect The critical section.
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| 288 | */
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| 289 | RTDECL(int) RTCritSectDelete(PRTCRITSECT pCritSect);
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| 290 |
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| 291 | /**
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| 292 | * Checks the caller is the owner of the critical section.
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| 293 | *
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| 294 | * @returns true if owner.
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| 295 | * @returns false if not owner.
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| 296 | * @param pCritSect The critical section.
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| 297 | */
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| 298 | DECLINLINE(bool) RTCritSectIsOwner(PCRTCRITSECT pCritSect)
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| 299 | {
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| 300 | return pCritSect->NativeThreadOwner == RTThreadNativeSelf();
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| 301 | }
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| 302 |
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| 303 | #endif /* IN_RING3 || IN_RING0 */
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| 304 |
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| 305 | /**
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| 306 | * Checks the section is owned by anyone.
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| 307 | *
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| 308 | * @returns true if owned.
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| 309 | * @returns false if not owned.
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| 310 | * @param pCritSect The critical section.
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| 311 | */
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| 312 | DECLINLINE(bool) RTCritSectIsOwned(PCRTCRITSECT pCritSect)
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| 313 | {
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| 314 | return pCritSect->NativeThreadOwner != NIL_RTNATIVETHREAD;
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| 315 | }
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| 316 |
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| 317 | /**
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| 318 | * Gets the thread id of the critical section owner.
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| 319 | *
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| 320 | * @returns Thread id of the owner thread if owned.
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| 321 | * @returns NIL_RTNATIVETHREAD is not owned.
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| 322 | * @param pCritSect The critical section.
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| 323 | */
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| 324 | DECLINLINE(RTNATIVETHREAD) RTCritSectGetOwner(PCRTCRITSECT pCritSect)
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| 325 | {
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| 326 | return pCritSect->NativeThreadOwner;
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| 327 | }
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| 328 |
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| 329 | /**
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| 330 | * Checks if a critical section is initialized or not.
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| 331 | *
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| 332 | * @returns true if initialized.
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| 333 | * @returns false if not initialized.
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| 334 | * @param pCritSect The critical section.
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| 335 | */
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| 336 | DECLINLINE(bool) RTCritSectIsInitialized(PCRTCRITSECT pCritSect)
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| 337 | {
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| 338 | return pCritSect->u32Magic == RTCRITSECT_MAGIC;
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| 339 | }
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| 340 |
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| 341 | /**
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| 342 | * Gets the recursion depth.
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| 343 | *
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| 344 | * @returns The recursion depth.
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| 345 | * @param pCritSect The Critical section
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| 346 | */
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| 347 | DECLINLINE(uint32_t) RTCritSectGetRecursion(PCRTCRITSECT pCritSect)
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| 348 | {
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| 349 | return (uint32_t)pCritSect->cNestings;
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| 350 | }
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| 351 |
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| 352 | /**
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| 353 | * Gets the waiter count
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| 354 | *
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| 355 | * @returns The waiter count
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| 356 | * @param pCritSect The Critical section
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| 357 | */
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| 358 | DECLINLINE(int32_t) RTCritSectGetWaiters(PCRTCRITSECT pCritSect)
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| 359 | {
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| 360 | return pCritSect->cLockers;
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| 361 | }
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| 362 |
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| 363 | /* Lock strict build: Remap the three enter calls to the debug versions. */
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| 364 | #if defined(RT_LOCK_STRICT) && !defined(RTCRITSECT_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
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| 365 | # ifdef IPRT_INCLUDED_asm_h
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| 366 | # define RTCritSectEnter(pCritSect) RTCritSectEnterDebug(pCritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 367 | # define RTCritSectTryEnter(pCritSect) RTCritSectTryEnterDebug(pCritSect, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 368 | # define RTCritSectEnterMultiple(cCritSects, pCritSect) RTCritSectEnterMultipleDebug((cCritSects), (pCritSect), (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
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| 369 | # else
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| 370 | # define RTCritSectEnter(pCritSect) RTCritSectEnterDebug(pCritSect, 0, RT_SRC_POS)
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| 371 | # define RTCritSectTryEnter(pCritSect) RTCritSectTryEnterDebug(pCritSect, 0, RT_SRC_POS)
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| 372 | # define RTCritSectEnterMultiple(cCritSects, pCritSect) RTCritSectEnterMultipleDebug((cCritSects), (pCritSect), 0, RT_SRC_POS)
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| 373 | # endif
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| 374 | #endif
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| 375 |
|
|---|
| 376 | /* Strict lock order: Automatically classify locks by init location. */
|
|---|
| 377 | #if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3) && !defined(RTCRITSECT_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
|
|---|
| 378 | # define RTCritSectInit(pCritSect) \
|
|---|
| 379 | RTCritSectInitEx((pCritSect), 0 /*fFlags*/, \
|
|---|
| 380 | RTLockValidatorClassForSrcPos(RT_SRC_POS, NULL), \
|
|---|
| 381 | RTLOCKVAL_SUB_CLASS_NONE, NULL)
|
|---|
| 382 | #endif
|
|---|
| 383 |
|
|---|
| 384 | /** @} */
|
|---|
| 385 |
|
|---|
| 386 |
|
|---|
| 387 |
|
|---|
| 388 | /** @defgroup grp_rt_critsectrw RTCritSectRw - Read/Write Critical Sections
|
|---|
| 389 | * @ingroup grp_rt
|
|---|
| 390 | * @{
|
|---|
| 391 | */
|
|---|
| 392 |
|
|---|
| 393 | /**
|
|---|
| 394 | * Union that allows us to atomically update both the state and
|
|---|
| 395 | * exclusive owner if the hardware supports cmpxchg16b or similar.
|
|---|
| 396 | */
|
|---|
| 397 | typedef union RTCRITSECTRWSTATE
|
|---|
| 398 | {
|
|---|
| 399 | struct
|
|---|
| 400 | {
|
|---|
| 401 | /** The state variable.
|
|---|
| 402 | * All accesses are atomic and it bits are defined like this:
|
|---|
| 403 | * Bits 0..14 - cReads.
|
|---|
| 404 | * Bit 15 - Unused.
|
|---|
| 405 | * Bits 16..31 - cWrites.
|
|---|
| 406 | * Bit 31 - fDirection; 0=Read, 1=Write.
|
|---|
| 407 | * Bits 32..46 - cWaitingReads
|
|---|
| 408 | * Bit 47 - Unused.
|
|---|
| 409 | * Bits 48..62 - cWaitingWrites - doesn't make sense here, not used.
|
|---|
| 410 | * Bit 63 - Unused.
|
|---|
| 411 | */
|
|---|
| 412 | uint64_t u64State;
|
|---|
| 413 | /** The write owner. */
|
|---|
| 414 | RTNATIVETHREAD hNativeWriter;
|
|---|
| 415 | } s;
|
|---|
| 416 | RTUINT128U u128;
|
|---|
| 417 | } RTCRITSECTRWSTATE;
|
|---|
| 418 |
|
|---|
| 419 |
|
|---|
| 420 | /**
|
|---|
| 421 | * Read/write critical section.
|
|---|
| 422 | */
|
|---|
| 423 | typedef struct RTCRITSECTRW
|
|---|
| 424 | {
|
|---|
| 425 | /** Magic used to validate the section state.
|
|---|
| 426 | * RTCRITSECTRW_MAGIC is the value of an initialized & operational section. */
|
|---|
| 427 | volatile uint32_t u32Magic;
|
|---|
| 428 |
|
|---|
| 429 | /** Indicates whether hEvtRead needs resetting. */
|
|---|
| 430 | bool volatile fNeedReset;
|
|---|
| 431 | /** Explicit alignment padding. */
|
|---|
| 432 | bool volatile afPadding[1];
|
|---|
| 433 | /** Section flags - the RTCRITSECT_FLAGS_* \#defines. */
|
|---|
| 434 | uint16_t fFlags;
|
|---|
| 435 |
|
|---|
| 436 | /** The number of reads made by the current writer. */
|
|---|
| 437 | uint32_t volatile cWriterReads;
|
|---|
| 438 | /** The number of recursions made by the current writer. (The initial grabbing
|
|---|
| 439 | * of the lock counts as the first one.) */
|
|---|
| 440 | uint32_t volatile cWriteRecursions;
|
|---|
| 441 | /** The core state. */
|
|---|
| 442 | RTCRITSECTRWSTATE volatile u;
|
|---|
| 443 |
|
|---|
| 444 | /** What the writer threads are blocking on. */
|
|---|
| 445 | RTSEMEVENT hEvtWrite;
|
|---|
| 446 | /** What the read threads are blocking on when waiting for the writer to
|
|---|
| 447 | * finish. */
|
|---|
| 448 | RTSEMEVENTMULTI hEvtRead;
|
|---|
| 449 |
|
|---|
| 450 | /** The validator record for the writer. */
|
|---|
| 451 | R3R0PTRTYPE(PRTLOCKVALRECEXCL) pValidatorWrite;
|
|---|
| 452 | /** The validator record for the readers. */
|
|---|
| 453 | R3R0PTRTYPE(PRTLOCKVALRECSHRD) pValidatorRead;
|
|---|
| 454 | } RTCRITSECTRW;
|
|---|
| 455 | AssertCompileSize(RTCRITSECTRW, HC_ARCH_BITS == 32 ? 48 : 64);
|
|---|
| 456 |
|
|---|
| 457 | /** RTCRITSECTRW::u32Magic value. (Eric Allan Dolphy, Jr.) */
|
|---|
| 458 | #define RTCRITSECTRW_MAGIC UINT32_C(0x19280620)
|
|---|
| 459 | /** RTCRITSECTRW::u32Magic dead value. */
|
|---|
| 460 | #define RTCRITSECTRW_MAGIC_DEAD UINT32_C(0x19640629)
|
|---|
| 461 |
|
|---|
| 462 | /** @name RTCRITSECTRW::u64State values.
|
|---|
| 463 | * @note Using RTCSRW instead of RTCRITSECTRW to save space.
|
|---|
| 464 | * @{ */
|
|---|
| 465 | #define RTCSRW_CNT_BITS 15
|
|---|
| 466 | #define RTCSRW_CNT_MASK UINT64_C(0x00007fff)
|
|---|
| 467 |
|
|---|
| 468 | #define RTCSRW_CNT_RD_SHIFT 0
|
|---|
| 469 | #define RTCSRW_CNT_RD_MASK (RTCSRW_CNT_MASK << RTCSRW_CNT_RD_SHIFT)
|
|---|
| 470 | #define RTCSRW_CNT_WR_SHIFT 16
|
|---|
| 471 | #define RTCSRW_CNT_WR_MASK (RTCSRW_CNT_MASK << RTCSRW_CNT_WR_SHIFT)
|
|---|
| 472 |
|
|---|
| 473 | #define RTCSRW_DIR_SHIFT 31
|
|---|
| 474 | #define RTCSRW_DIR_MASK RT_BIT_64(RTCSRW_DIR_SHIFT)
|
|---|
| 475 | #define RTCSRW_DIR_READ UINT64_C(0)
|
|---|
| 476 | #define RTCSRW_DIR_WRITE UINT64_C(1)
|
|---|
| 477 |
|
|---|
| 478 | #define RTCSRW_WAIT_CNT_RD_SHIFT 32
|
|---|
| 479 | #define RTCSRW_WAIT_CNT_RD_MASK (RTCSRW_CNT_MASK << RTCSRW_WAIT_CNT_RD_SHIFT)
|
|---|
| 480 | /* #define RTCSRW_WAIT_CNT_WR_SHIFT 48 */
|
|---|
| 481 | /* #define RTCSRW_WAIT_CNT_WR_MASK (RTCSRW_CNT_MASK << RTCSRW_WAIT_CNT_WR_SHIFT) */
|
|---|
| 482 | /** @} */
|
|---|
| 483 |
|
|---|
| 484 | #if defined(IN_RING3) || defined(IN_RING0)
|
|---|
| 485 |
|
|---|
| 486 | /**
|
|---|
| 487 | * Initialize a critical section.
|
|---|
| 488 | */
|
|---|
| 489 | RTDECL(int) RTCritSectRwInit(PRTCRITSECTRW pThis);
|
|---|
| 490 |
|
|---|
| 491 | /**
|
|---|
| 492 | * Initialize a critical section.
|
|---|
| 493 | *
|
|---|
| 494 | * @returns IPRT status code.
|
|---|
| 495 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 496 | * @param fFlags Flags, any combination of the RTCRITSECT_FLAGS
|
|---|
| 497 | * \#defines.
|
|---|
| 498 | * @param hClass The class (no reference consumed). If NIL, no lock
|
|---|
| 499 | * order validation will be performed on this lock.
|
|---|
| 500 | * @param uSubClass The sub-class. This is used to define lock order
|
|---|
| 501 | * within a class. RTLOCKVAL_SUB_CLASS_NONE is the
|
|---|
| 502 | * recommended value here.
|
|---|
| 503 | * @param pszNameFmt Name format string for the lock validator, optional
|
|---|
| 504 | * (NULL). Max length is 32 bytes.
|
|---|
| 505 | * @param ... Format string arguments.
|
|---|
| 506 | */
|
|---|
| 507 | RTDECL(int) RTCritSectRwInitEx(PRTCRITSECTRW pThis, uint32_t fFlags, RTLOCKVALCLASS hClass, uint32_t uSubClass,
|
|---|
| 508 | const char *pszNameFmt, ...) RT_IPRT_FORMAT_ATTR_MAYBE_NULL(5, 6);
|
|---|
| 509 |
|
|---|
| 510 | /**
|
|---|
| 511 | * Changes the lock validator sub-class of the critical section.
|
|---|
| 512 | *
|
|---|
| 513 | * It is recommended to try make sure that nobody is using this critical section
|
|---|
| 514 | * while changing the value.
|
|---|
| 515 | *
|
|---|
| 516 | * @returns The old sub-class. RTLOCKVAL_SUB_CLASS_INVALID is returns if the
|
|---|
| 517 | * lock validator isn't compiled in or either of the parameters are
|
|---|
| 518 | * invalid.
|
|---|
| 519 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 520 | * @param uSubClass The new sub-class value.
|
|---|
| 521 | */
|
|---|
| 522 | RTDECL(uint32_t) RTCritSectRwSetSubClass(PRTCRITSECTRW pThis, uint32_t uSubClass);
|
|---|
| 523 |
|
|---|
| 524 |
|
|---|
| 525 | /**
|
|---|
| 526 | * Enter a critical section with shared (read) access.
|
|---|
| 527 | *
|
|---|
| 528 | * @returns IPRT status code.
|
|---|
| 529 | * @retval VINF_SUCCESS on success.
|
|---|
| 530 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 531 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 532 | * during the operation.
|
|---|
| 533 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 534 | */
|
|---|
| 535 | RTDECL(int) RTCritSectRwEnterShared(PRTCRITSECTRW pThis);
|
|---|
| 536 |
|
|---|
| 537 | /**
|
|---|
| 538 | * Enter a critical section with shared (read) access.
|
|---|
| 539 | *
|
|---|
| 540 | * @returns IPRT status code.
|
|---|
| 541 | * @retval VINF_SUCCESS on success.
|
|---|
| 542 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 543 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 544 | * during the operation.
|
|---|
| 545 | *
|
|---|
| 546 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 547 | * @param uId Where we're entering the section.
|
|---|
| 548 | * @param SRC_POS The source position where call is being made from.
|
|---|
| 549 | * Use RT_SRC_POS when possible. Optional.
|
|---|
| 550 | */
|
|---|
| 551 | RTDECL(int) RTCritSectRwEnterSharedDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
|---|
| 552 |
|
|---|
| 553 | /**
|
|---|
| 554 | * Try enter a critical section with shared (read) access.
|
|---|
| 555 | *
|
|---|
| 556 | * @returns IPRT status code.
|
|---|
| 557 | * @retval VINF_SUCCESS on success.
|
|---|
| 558 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
|---|
| 559 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 560 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 561 | * during the operation.
|
|---|
| 562 | *
|
|---|
| 563 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 564 | */
|
|---|
| 565 | RTDECL(int) RTCritSectRwTryEnterShared(PRTCRITSECTRW pThis);
|
|---|
| 566 |
|
|---|
| 567 | /**
|
|---|
| 568 | * Try enter a critical section with shared (read) access.
|
|---|
| 569 | *
|
|---|
| 570 | * @returns IPRT status code.
|
|---|
| 571 | * @retval VINF_SUCCESS on success.
|
|---|
| 572 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
|---|
| 573 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 574 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 575 | * during the operation.
|
|---|
| 576 | *
|
|---|
| 577 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 578 | * @param uId Where we're entering the section.
|
|---|
| 579 | * @param SRC_POS The source position where call is being made from.
|
|---|
| 580 | * Use RT_SRC_POS when possible. Optional.
|
|---|
| 581 | */
|
|---|
| 582 | RTDECL(int) RTCritSectRwTryEnterSharedDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
|---|
| 583 |
|
|---|
| 584 | /**
|
|---|
| 585 | * Leave a critical section held with shared access.
|
|---|
| 586 | *
|
|---|
| 587 | * @returns IPRT status code.
|
|---|
| 588 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 589 | */
|
|---|
| 590 | RTDECL(int) RTCritSectRwLeaveShared(PRTCRITSECTRW pThis);
|
|---|
| 591 |
|
|---|
| 592 |
|
|---|
| 593 | /**
|
|---|
| 594 | * Enter a critical section with exclusive (write) access.
|
|---|
| 595 | *
|
|---|
| 596 | * @returns IPRT status code.
|
|---|
| 597 | * @retval VINF_SUCCESS on success.
|
|---|
| 598 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 599 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 600 | * during the operation.
|
|---|
| 601 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 602 | */
|
|---|
| 603 | RTDECL(int) RTCritSectRwEnterExcl(PRTCRITSECTRW pThis);
|
|---|
| 604 |
|
|---|
| 605 | /**
|
|---|
| 606 | * Enter a critical section with exclusive (write) access.
|
|---|
| 607 | *
|
|---|
| 608 | * @retval VINF_SUCCESS on success.
|
|---|
| 609 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 610 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 611 | * during the operation.
|
|---|
| 612 | *
|
|---|
| 613 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 614 | * @param uId Where we're entering the section.
|
|---|
| 615 | * @param SRC_POS The source position where call is being made from.
|
|---|
| 616 | * Use RT_SRC_POS when possible. Optional.
|
|---|
| 617 | */
|
|---|
| 618 | RTDECL(int) RTCritSectRwEnterExclDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
|---|
| 619 |
|
|---|
| 620 | /**
|
|---|
| 621 | * Try enter a critical section with exclusive (write) access.
|
|---|
| 622 | *
|
|---|
| 623 | * @returns IPRT status code.
|
|---|
| 624 | * @retval VINF_SUCCESS on success.
|
|---|
| 625 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
|---|
| 626 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 627 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 628 | * during the operation.
|
|---|
| 629 | *
|
|---|
| 630 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 631 | */
|
|---|
| 632 | RTDECL(int) RTCritSectRwTryEnterExcl(PRTCRITSECTRW pThis);
|
|---|
| 633 |
|
|---|
| 634 | /**
|
|---|
| 635 | * Try enter a critical section with exclusive (write) access.
|
|---|
| 636 | *
|
|---|
| 637 | * @returns IPRT status code.
|
|---|
| 638 | * @retval VINF_SUCCESS on success.
|
|---|
| 639 | * @retval VERR_SEM_BUSY if the critsect was owned.
|
|---|
| 640 | * @retval VERR_SEM_NESTED if nested enter on a no nesting section. (Asserted.)
|
|---|
| 641 | * @retval VERR_SEM_DESTROYED if the critical section is delete before or
|
|---|
| 642 | * during the operation.
|
|---|
| 643 | *
|
|---|
| 644 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 645 | * @param uId Where we're entering the section.
|
|---|
| 646 | * @param SRC_POS The source position where call is being made from.
|
|---|
| 647 | * Use RT_SRC_POS when possible. Optional.
|
|---|
| 648 | */
|
|---|
| 649 | RTDECL(int) RTCritSectRwTryEnterExclDebug(PRTCRITSECTRW pThis, RTHCUINTPTR uId, RT_SRC_POS_DECL);
|
|---|
| 650 |
|
|---|
| 651 | /**
|
|---|
| 652 | * Leave a critical section held exclusively.
|
|---|
| 653 | *
|
|---|
| 654 | * @returns IPRT status code; VINF_SUCCESS, VERR_NOT_OWNER, VERR_SEM_DESTROYED,
|
|---|
| 655 | * or VERR_WRONG_ORDER.
|
|---|
| 656 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 657 | */
|
|---|
| 658 | RTDECL(int) RTCritSectRwLeaveExcl(PRTCRITSECTRW pThis);
|
|---|
| 659 |
|
|---|
| 660 |
|
|---|
| 661 | /**
|
|---|
| 662 | * Deletes a critical section.
|
|---|
| 663 | *
|
|---|
| 664 | * @returns VINF_SUCCESS.
|
|---|
| 665 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 666 | */
|
|---|
| 667 | RTDECL(int) RTCritSectRwDelete(PRTCRITSECTRW pThis);
|
|---|
| 668 |
|
|---|
| 669 | /**
|
|---|
| 670 | * Checks the caller is the exclusive (write) owner of the critical section.
|
|---|
| 671 | *
|
|---|
| 672 | * @retval true if owner.
|
|---|
| 673 | * @retval false if not owner.
|
|---|
| 674 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 675 | */
|
|---|
| 676 | RTDECL(bool) RTCritSectRwIsWriteOwner(PRTCRITSECTRW pThis);
|
|---|
| 677 |
|
|---|
| 678 | /**
|
|---|
| 679 | * Checks if the caller is one of the read owners of the critical section.
|
|---|
| 680 | *
|
|---|
| 681 | * @note !CAUTION! This API doesn't work reliably if lock validation isn't
|
|---|
| 682 | * enabled. Meaning, the answer is not trustworhty unless
|
|---|
| 683 | * RT_LOCK_STRICT or RTCRITSECTRW_STRICT was defined at build time.
|
|---|
| 684 | * Also, make sure you do not use RTCRITSECTRW_FLAGS_NO_LOCK_VAL when
|
|---|
| 685 | * creating the semaphore. And finally, if you used a locking class,
|
|---|
| 686 | * don't disable deadlock detection by setting cMsMinDeadlock to
|
|---|
| 687 | * RT_INDEFINITE_WAIT.
|
|---|
| 688 | *
|
|---|
| 689 | * In short, only use this for assertions.
|
|---|
| 690 | *
|
|---|
| 691 | * @returns @c true if reader, @c false if not.
|
|---|
| 692 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 693 | * @param fWannaHear What you'd like to hear when lock validation is not
|
|---|
| 694 | * available. (For avoiding asserting all over the
|
|---|
| 695 | * place.)
|
|---|
| 696 | */
|
|---|
| 697 | RTDECL(bool) RTCritSectRwIsReadOwner(PRTCRITSECTRW pThis, bool fWannaHear);
|
|---|
| 698 |
|
|---|
| 699 | /**
|
|---|
| 700 | * Gets the write recursion count.
|
|---|
| 701 | *
|
|---|
| 702 | * @returns The write recursion count (0 if bad critsect).
|
|---|
| 703 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 704 | */
|
|---|
| 705 | RTDECL(uint32_t) RTCritSectRwGetWriteRecursion(PRTCRITSECTRW pThis);
|
|---|
| 706 |
|
|---|
| 707 | /**
|
|---|
| 708 | * Gets the read recursion count of the current writer.
|
|---|
| 709 | *
|
|---|
| 710 | * @returns The read recursion count (0 if bad critsect).
|
|---|
| 711 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 712 | */
|
|---|
| 713 | RTDECL(uint32_t) RTCritSectRwGetWriterReadRecursion(PRTCRITSECTRW pThis);
|
|---|
| 714 |
|
|---|
| 715 | /**
|
|---|
| 716 | * Gets the current number of reads.
|
|---|
| 717 | *
|
|---|
| 718 | * This includes all read recursions, so it might be higher than the number of
|
|---|
| 719 | * read owners. It does not include reads done by the current writer.
|
|---|
| 720 | *
|
|---|
| 721 | * @returns The read count (0 if bad critsect).
|
|---|
| 722 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 723 | */
|
|---|
| 724 | RTDECL(uint32_t) RTCritSectRwGetReadCount(PRTCRITSECTRW pThis);
|
|---|
| 725 |
|
|---|
| 726 | #endif /* IN_RING3 || IN_RING0 */
|
|---|
| 727 |
|
|---|
| 728 | /**
|
|---|
| 729 | * Checks if a critical section is initialized or not.
|
|---|
| 730 | *
|
|---|
| 731 | * @retval true if initialized.
|
|---|
| 732 | * @retval false if not initialized.
|
|---|
| 733 | * @param pThis Pointer to the read/write critical section.
|
|---|
| 734 | */
|
|---|
| 735 | DECLINLINE(bool) RTCritSectRwIsInitialized(PCRTCRITSECTRW pThis)
|
|---|
| 736 | {
|
|---|
| 737 | return pThis->u32Magic == RTCRITSECTRW_MAGIC;
|
|---|
| 738 | }
|
|---|
| 739 |
|
|---|
| 740 | /* Lock strict build: Remap the three enter calls to the debug versions. */
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| 741 | #if defined(RT_LOCK_STRICT) && !defined(RTCRITSECTRW_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
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| 742 | # ifdef IPRT_INCLUDED_asm_h
|
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| 743 | # define RTCritSectRwEnterExcl(pThis) RTCritSectRwEnterExclDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
|
|---|
| 744 | # define RTCritSectRwTryEnterExcl(pThis) RTCritSectRwTryEnterExclDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
|
|---|
| 745 | # define RTCritSectRwEnterShared(pThis) RTCritSectRwEnterSharedDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
|
|---|
| 746 | # define RTCritSectRwTryEnterShared(pThis) RTCritSectRwTryEnterSharedDebug(pThis, (uintptr_t)ASMReturnAddress(), RT_SRC_POS)
|
|---|
| 747 | # else
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|---|
| 748 | # define RTCritSectRwEnterExcl(pThis) RTCritSectRwEnterExclDebug(pThis, 0, RT_SRC_POS)
|
|---|
| 749 | # define RTCritSectRwTryEnterExcl(pThis) RTCritSectRwTryEnterExclDebug(pThis, 0, RT_SRC_POS)
|
|---|
| 750 | # define RTCritSectRwEnterShared(pThis) RTCritSectRwEnterSharedDebug(pThis, 0, RT_SRC_POS)
|
|---|
| 751 | # define RTCritSectRwTryEnterShared(pThis) RTCritSectRwTryEnterSharedDebug(pThis, 0, RT_SRC_POS)
|
|---|
| 752 | # endif
|
|---|
| 753 | #endif
|
|---|
| 754 |
|
|---|
| 755 | /* Strict lock order: Automatically classify locks by init location. */
|
|---|
| 756 | #if defined(RT_LOCK_STRICT_ORDER) && defined(IN_RING3) && !defined(RTCRITSECTRW_WITHOUT_REMAPPING) && !defined(RT_WITH_MANGLING)
|
|---|
| 757 | # define RTCritSectRwInit(a_pThis) \
|
|---|
| 758 | RTCritSectRwInitEx((a_pThis), 0 /*fFlags*/, \
|
|---|
| 759 | RTLockValidatorClassForSrcPos(RT_SRC_POS, NULL), \
|
|---|
| 760 | RTLOCKVAL_SUB_CLASS_NONE, NULL)
|
|---|
| 761 | #endif
|
|---|
| 762 |
|
|---|
| 763 | /** @} */
|
|---|
| 764 |
|
|---|
| 765 | RT_C_DECLS_END
|
|---|
| 766 |
|
|---|
| 767 | #endif /* !IPRT_INCLUDED_critsect_h */
|
|---|
| 768 |
|
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