mirror of
https://github.com/jart/cosmopolitan.git
synced 2024-05-17 02:52:40 +00:00
2ab9e9f7fd
- Introduce portable sched_getcpu() api - Support GCC's __target_clones__ feature - Make fma() go faster on x86 in default mode - Remove some asan checks from core libraries - WinMain() now ensures $HOME and $USER are defined
65 lines
3 KiB
C
65 lines
3 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2024 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/struct/cpuset.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/nexgen32e/rdtscp.h"
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#include "libc/nexgen32e/x86feature.h"
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#include "libc/nt/struct/processornumber.h"
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#include "libc/nt/synchronization.h"
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#include "libc/runtime/syslib.internal.h"
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#include "libc/sysv/errfuns.h"
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int sys_getcpu(unsigned *opt_cpu, unsigned *opt_node, void *tcache);
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/**
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* Returns ID of CPU on which thread is currently scheduled.
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* @return cpu number on success, or -1 w/ errno
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*/
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int sched_getcpu(void) {
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if (X86_HAVE(RDTSCP)) {
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unsigned tsc_aux;
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rdtscp(&tsc_aux);
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return TSC_AUX_CORE(tsc_aux);
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} else if (IsWindows()) {
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struct NtProcessorNumber pn;
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GetCurrentProcessorNumberEx(&pn);
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return 64 * pn.Group + pn.Number;
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} else if (IsXnuSilicon()) {
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if (__syslib->__version >= 9) {
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size_t cpu;
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errno_t err = __syslib->__pthread_cpu_number_np(&cpu);
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if (!err) {
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return cpu;
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} else {
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errno = err;
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return -1;
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}
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} else {
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return enosys();
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}
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} else {
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unsigned cpu = 0;
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int rc = sys_getcpu(&cpu, 0, 0);
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if (rc == -1) return -1;
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return cpu;
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}
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}
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