mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
3f49889841
- Fix preadv() and pwritev() for old distros - Introduce _npassert() and _unassert() macros - Prove that file locks work properly on Windows - Support fcntl(F_DUPFD_CLOEXEC) on more systems
82 lines
3.8 KiB
C
82 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/calls.h"
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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/intrin/strace.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/process.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/str/str.h"
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#include "libc/sysv/errfuns.h"
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static textwindows int sys_sched_getaffinity_nt(int tid, size_t size,
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cpu_set_t *bitset) {
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uint64_t ProcessAffinityMask, SystemAffinityMask;
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if (GetProcessAffinityMask(GetCurrentProcess(), &ProcessAffinityMask,
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&SystemAffinityMask)) {
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bzero(bitset, size);
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bitset->__bits[0] = ProcessAffinityMask;
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return 0;
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} else {
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return __winerr();
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}
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}
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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 sched_setaffinity() on Windows.
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*
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* @param pid is the process or thread id (or 0 for caller)
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* @param size is byte length of bitset, which should 128
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* @param bitset receives bitset and should be uint64_t[16] in order to
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* work on older versions of Linux
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* @return 0 on success, or -1 w/ errno
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* @raise ENOSYS if not Linux, NetBSD, or Windows
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*/
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int sched_getaffinity(int tid, size_t size, cpu_set_t *bitset) {
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int rc;
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if (size != 128) {
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rc = einval();
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} else if (IsWindows()) {
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rc = sys_sched_getaffinity_nt(tid, size, bitset);
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} else if (IsNetbsd()) {
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if (!sys_sched_getaffinity_netbsd(0, tid, MIN(size, 32), bitset)) {
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rc = MIN(size, 32);
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} else {
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rc = -1;
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}
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} else {
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rc = sys_sched_getaffinity(tid, size, bitset);
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}
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if (rc > 0) {
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if (rc < size) {
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bzero((char *)bitset + rc, size - rc);
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}
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rc = 0;
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}
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STRACE("sched_getaffinity(%d, %'zu, %p) → %d% m", tid, size, bitset);
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return rc;
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}
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