mirror of
https://github.com/jart/cosmopolitan.git
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99 lines
3.6 KiB
C
99 lines
3.6 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 2021 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/assert.h"
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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/weirdtypes.h"
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#include "libc/dce.h"
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#include "libc/intrin/popcnt.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/dll.h"
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#include "libc/nt/struct/systeminfo.h"
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#include "libc/nt/systeminfo.h"
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#include "libc/runtime/runtime.h"
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#define CTL_HW 6
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#define HW_NCPU 3
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#define HW_NCPUONLINE_OPENBSD 25
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#define HW_NCPUONLINE_NETBSD 16
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#define ALL_PROCESSOR_GROUPS 0xffff
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static unsigned GetCpuCountLinux(void) {
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uint64_t s[16];
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unsigned i, c, n;
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if (!sys_sched_getaffinity(0, sizeof(s), s)) {
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for (c = i = 0; i < ARRAYLEN(s); ++i) {
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c += popcnt(s[i]);
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}
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return c;
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} else {
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return 0;
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}
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}
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static unsigned GetCpuCountBsd(void) {
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size_t n;
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int c, cmd[2];
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n = sizeof(c);
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cmd[0] = CTL_HW;
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if (IsOpenbsd()) {
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cmd[1] = HW_NCPUONLINE_OPENBSD;
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} else if (IsNetbsd()) {
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cmd[1] = HW_NCPUONLINE_NETBSD;
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} else {
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cmd[1] = HW_NCPU;
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}
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if (!sysctl(cmd, 2, &c, &n, 0, 0)) {
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return c;
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} else {
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return 0;
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}
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}
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static textwindows unsigned GetCpuCountWindows(void) {
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struct NtSystemInfo si;
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uint32_t (*f)(uint16_t);
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if ((f = GetProcAddress(GetModuleHandle("KERNEL32"),
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"GetMaximumProcessorCount"))) {
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return f(ALL_PROCESSOR_GROUPS);
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} else {
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GetSystemInfo(&si);
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return si.dwNumberOfProcessors;
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}
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}
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/**
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* Returns number of CPUs in system.
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*
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* On Intel systems with HyperThreading this will return the number of
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* cores multiplied by two.
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*
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* @return cpu count or 0 if it couldn't be determined
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*/
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unsigned GetCpuCount(void) {
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if (!IsWindows()) {
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if (!IsBsd()) {
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return GetCpuCountLinux();
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} else {
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return GetCpuCountBsd();
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}
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} else {
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return GetCpuCountWindows();
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}
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}
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