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Add more POSIX threads APIs

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Justine Tunney 2022-09-09 11:30:33 -07:00
parent 1729a8259c
commit c3208eb9d5
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32 changed files with 592 additions and 87 deletions
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libc/thread/pthread_getaffinity_np.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/struct/cpuset.h"
#include "libc/errno.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/thread.h"
/**
* Gets CPU affinity for thread.
*
* While Windows allows us to change the thread affinity mask, it's only
* possible to read the process affinity mask. Therefore this function
* won't reflect the changes made by psched_setaffinity_np() on Windows.
*
* @param bitsetsize is byte length of bitset, which should be 128
* @return 0 on success, or errno on error
* @raise ENOSYS if not Linux or Windows
*/
int pthread_getaffinity_np(pthread_t thread, size_t bitsetsize,
cpu_set_t *bitset) {
int rc, e = errno;
struct PosixThread *pt = (struct PosixThread *)thread;
if (!sched_getaffinity(pt->tid, bitsetsize, bitset)) {
return 0;
} else {
rc = errno;
errno = e;
return rc;
}
}