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134ffee519
Doing this makes binaries tinier, since we don't need to have all the
extra code for supporting a 32-bit address space. It also benefits us
because we're able to use WIN32 futexes, which makes locking simpler.
b69f3d2488 is what officially ended our
Windows 7 support. This change is merely a formalization. You can use
old versions of Cosmo now and forevermore if you need Windows 7 since
our repository is hermetic and vendors all its dependencies.
Won't fix #617
94 lines
3.5 KiB
C
94 lines
3.5 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/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/weirdtypes.h"
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#include "libc/dce.h"
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#include "libc/macros.internal.h"
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#include "libc/nt/accounting.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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cpu_set_t s = {0};
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if (sys_sched_getaffinity(0, sizeof(s), &s) != -1) {
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return CPU_COUNT(&s);
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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 (!sys_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 unsigned GetCpuCountImpl(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 GetMaximumProcessorCount(ALL_PROCESSOR_GROUPS);
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}
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}
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static int g_cpucount;
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// precompute because process affinity on linux may change later
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__attribute__((__constructor__)) static void init(void) {
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g_cpucount = GetCpuCountImpl();
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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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return g_cpucount;
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}
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