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a75cd1e3af
Also return EINVAL if the thread is already terminated at the time of the call. This is slight better than returning the calling thread affinity (current behaviour), since the thread lifetime is defined. Checked on x86_64-linux-gnu.
71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
/* Copyright (C) 2003-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <libc-lock.h>
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#include <pthreadP.h>
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#include <shlib-compat.h>
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int
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__pthread_getaffinity_np (pthread_t th, size_t cpusetsize, cpu_set_t *cpuset)
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{
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struct pthread *pd = (struct pthread *) th;
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/* Block all signals, as required by pd->exit_lock. */
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internal_sigset_t old_mask;
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internal_signal_block_all (&old_mask);
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__libc_lock_lock (pd->exit_lock);
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int res= 0;
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if (pd->tid > 0)
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res = INTERNAL_SYSCALL_CALL (sched_getaffinity, pd->tid,
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MIN (INT_MAX, cpusetsize), cpuset);
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else
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res = -EINVAL;
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__libc_lock_unlock (pd->exit_lock);
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internal_signal_restore_set (&old_mask);
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if (res < 0)
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return -res;
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/* Clean the rest of the memory the kernel didn't do. */
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memset ((char *) cpuset + res, '\0', cpusetsize - res);
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return 0;
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}
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libc_hidden_def (__pthread_getaffinity_np)
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versioned_symbol (libc, __pthread_getaffinity_np, pthread_getaffinity_np,
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GLIBC_2_32);
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#if SHLIB_COMPAT (libc, GLIBC_2_3_4, GLIBC_2_32)
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strong_alias (__pthread_getaffinity_np, __pthread_getaffinity_alias)
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compat_symbol (libc, __pthread_getaffinity_alias, pthread_getaffinity_np,
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GLIBC_2_3_4);
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#endif
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#if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
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int
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__pthread_getaffinity_old (pthread_t th, cpu_set_t *cpuset)
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{
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/* The old interface by default assumed a 1024 processor bitmap. */
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return __pthread_getaffinity_np (th, 128, cpuset);
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}
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compat_symbol (libc, __pthread_getaffinity_old, pthread_getaffinity_np,
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GLIBC_2_3_3);
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#endif
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