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