mirror of
https://github.com/jart/cosmopolitan.git
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f2af97711b
- Improve compatibility with Blink virtual machine - Add non-POSIX APIs for joining threads and signal masks - Never ever use anything except 32-bit integers for atomics - Add some `#undef` statements to workaround `ctags` problems
80 lines
3.8 KiB
C
80 lines
3.8 KiB
C
/*-*- 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/sched-sysv.internal.h"
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#include "libc/calls/struct/cpuset.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/nt/enum/threadaccess.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/thread.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/posixthread.internal.h"
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static dontinline textwindows int sys_pthread_setaffinity_nt(
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int tid, uint64_t size, const cpu_set_t *bitset) {
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int rc;
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int64_t h;
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h = OpenThread(kNtThreadSetInformation | kNtThreadQueryInformation, false,
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tid);
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if (!h) return __winerr();
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rc = SetThreadAffinityMask(h, bitset->__bits[0]) ? 0 : __winerr();
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CloseHandle(h);
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return rc;
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}
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/**
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* Asks kernel to only schedule thread on particular CPUs.
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*
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* @param size is bytes in bitset, which should be `sizeof(cpu_set_t)`
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* @return 0 on success, or errno on error
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* @raise EINVAL if `size` or `bitset` is invalid
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* @raise ENOSYS if not Linux, FreeBSD, NetBSD, or Windows
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* @see sched_setaffinity() for processes
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*/
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errno_t pthread_setaffinity_np(pthread_t thread, size_t size,
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const cpu_set_t *bitset) {
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int e, rc, tid;
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if (!(rc = pthread_getunique_np(thread, &tid))) {
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e = errno;
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if (size != sizeof(cpu_set_t)) {
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rc = einval();
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} else if (IsWindows()) {
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rc = sys_pthread_setaffinity_nt(tid, size, bitset);
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} else if (IsFreebsd()) {
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rc = sys_sched_setaffinity_freebsd(CPU_LEVEL_WHICH, CPU_WHICH_TID, tid,
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32, bitset);
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} else if (IsNetbsd()) {
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rc = sys_sched_setaffinity_netbsd(tid, 0, 32, bitset);
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} else {
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rc = sys_sched_setaffinity(tid, size, bitset);
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}
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if (rc == -1) {
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rc = errno;
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errno = e;
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}
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}
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STRACE("pthread_setaffinity_np(%d, %'zu, %p) → %s", tid, size, bitset,
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DescribeErrno(rc));
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return rc;
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}
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