mirror of
https://github.com/jart/cosmopolitan.git
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46 lines
2.6 KiB
C
46 lines
2.6 KiB
C
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2022 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/calls/struct/cpuset.h"
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#include "libc/errno.h"
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#include "libc/thread/posixthread.internal.h"
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/**
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* Gets CPU affinity for thread.
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*
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* While Windows allows us to change the thread affinity mask, it's only
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* possible to read the process affinity mask. Therefore this function
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* won't reflect the changes made by psched_setaffinity_np() on Windows.
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*
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* @param bitsetsize is byte length of bitset, which should be 128
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* @return 0 on success, or errno on error
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* @raise ENOSYS if not Linux or Windows
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*/
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int pthread_getaffinity_np(pthread_t thread, size_t bitsetsize,
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cpu_set_t *bitset) {
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int rc, e = errno;
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struct PosixThread *pt = (struct PosixThread *)thread;
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if (!sched_getaffinity(pt->tid, bitsetsize, bitset)) {
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return 0;
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} else {
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rc = errno;
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errno = e;
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return rc;
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}
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}
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