VirtualBox

source: vbox/trunk/src/VBox/Runtime/r3/linux/thread-affinity-linux.cpp@ 103795

Last change on this file since 103795 was 98103, checked in by vboxsync, 23 months ago

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1/* $Id: thread-affinity-linux.cpp 98103 2023-01-17 14:15:46Z vboxsync $ */
2/** @file
3 * IPRT - Thread Affinity, Linux ring-3 implementation.
4 */
5
6/*
7 * Copyright (C) 2011-2023 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#ifndef _GNU_SOURCE
42# define _GNU_SOURCE
43#endif
44#include <features.h>
45#if __GLIBC_PREREQ(2,4)
46
47#include <sched.h>
48#include <unistd.h>
49#include <errno.h>
50#include <pthread.h>
51
52#include <iprt/thread.h>
53#include "internal/iprt.h"
54
55#include <iprt/assert.h>
56#include <iprt/cpuset.h>
57#include <iprt/err.h>
58#include <iprt/mp.h>
59
60
61
62RTR3DECL(int) RTThreadSetAffinity(PCRTCPUSET pCpuSet)
63{
64 /* convert */
65 cpu_set_t LnxCpuSet;
66 CPU_ZERO(&LnxCpuSet);
67 if (!pCpuSet)
68 for (unsigned iCpu = 0; iCpu < CPU_SETSIZE; iCpu++)
69 CPU_SET(iCpu, &LnxCpuSet);
70 else
71 for (unsigned iCpu = 0; iCpu < RT_MIN(CPU_SETSIZE, RTCPUSET_MAX_CPUS); iCpu++)
72 if (RTCpuSetIsMemberByIndex(pCpuSet, iCpu))
73 CPU_SET(iCpu, &LnxCpuSet);
74
75 int rc = pthread_setaffinity_np(pthread_self(), sizeof(LnxCpuSet), &LnxCpuSet);
76 if (!rc)
77 return VINF_SUCCESS;
78 rc = errno;
79 if (rc == ENOENT)
80 return VERR_CPU_NOT_FOUND;
81 return RTErrConvertFromErrno(errno);
82}
83
84
85RTR3DECL(int) RTThreadGetAffinity(PRTCPUSET pCpuSet)
86{
87 cpu_set_t LnxCpuSet;
88 int rc = pthread_getaffinity_np(pthread_self(), sizeof(LnxCpuSet), &LnxCpuSet);
89 if (rc != 0)
90 return RTErrConvertFromErrno(errno);
91
92 /* convert */
93 RTCpuSetEmpty(pCpuSet);
94 for (unsigned iCpu = 0; iCpu < RT_MIN(CPU_SETSIZE, RTCPUSET_MAX_CPUS); iCpu++)
95 if (CPU_ISSET(iCpu, &LnxCpuSet))
96 RTCpuSetAddByIndex(pCpuSet, iCpu);
97
98 return VINF_SUCCESS;
99}
100
101#else
102# include "../../generic/RTThreadGetAffinity-stub-generic.cpp"
103# include "../../generic/RTThreadSetAffinity-stub-generic.cpp"
104#endif
105
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