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/* $Id: thread-affinity-linux.cpp $ */
/** @file
* IPRT - Thread Affinity, Linux ring-3 implementation.
*/
/*
* Copyright (C) 2011-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#ifndef _GNU_SOURCE
# define _GNU_SOURCE
#endif
#include <features.h>
#if __GLIBC_PREREQ(2,4)
#include <sched.h>
#include <unistd.h>
#include <errno.h>
#include <pthread.h>
#include <iprt/thread.h>
#include "internal/iprt.h"
#include <iprt/assert.h>
#include <iprt/cpuset.h>
#include <iprt/err.h>
#include <iprt/mp.h>
RTR3DECL(int) RTThreadSetAffinity(PCRTCPUSET pCpuSet)
{
/* convert */
cpu_set_t LnxCpuSet;
CPU_ZERO(&LnxCpuSet);
if (!pCpuSet)
for (unsigned iCpu = 0; iCpu < CPU_SETSIZE; iCpu++)
CPU_SET(iCpu, &LnxCpuSet);
else
for (unsigned iCpu = 0; iCpu < RT_MIN(CPU_SETSIZE, RTCPUSET_MAX_CPUS); iCpu++)
if (RTCpuSetIsMemberByIndex(pCpuSet, iCpu))
CPU_SET(iCpu, &LnxCpuSet);
int rc = pthread_setaffinity_np(pthread_self(), sizeof(LnxCpuSet), &LnxCpuSet);
if (!rc)
return VINF_SUCCESS;
rc = errno;
if (rc == ENOENT)
return VERR_CPU_NOT_FOUND;
return RTErrConvertFromErrno(errno);
}
RTR3DECL(int) RTThreadGetAffinity(PRTCPUSET pCpuSet)
{
cpu_set_t LnxCpuSet;
int rc = pthread_getaffinity_np(pthread_self(), sizeof(LnxCpuSet), &LnxCpuSet);
if (rc != 0)
return RTErrConvertFromErrno(errno);
/* convert */
RTCpuSetEmpty(pCpuSet);
for (unsigned iCpu = 0; iCpu < RT_MIN(CPU_SETSIZE, RTCPUSET_MAX_CPUS); iCpu++)
if (CPU_ISSET(iCpu, &LnxCpuSet))
RTCpuSetAddByIndex(pCpuSet, iCpu);
return VINF_SUCCESS;
}
#else
# include "../../generic/RTThreadGetAffinity-stub-generic.cpp"
# include "../../generic/RTThreadSetAffinity-stub-generic.cpp"
#endif
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