mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 19:43:32 +00:00
b41f91c658
The cosmopolitan command interpreter now has 13 builtin commands, variable support, support for ; / && / || syntax, asynchronous support, and plenty of unit tests with bug fixes. This change fixes a bug in posix_spawn() with null envp arg. strace logging now uses atomic writes for scatter functions. Breaking change renaming GetCpuCount() to _getcpucount(). TurfWar is now updated to use the new token bucket algorithm. WIN32 affinity masks now inherit across fork() and execve().
100 lines
3.7 KiB
C
100 lines
3.7 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 _getcpucount_linux(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 _getcpucount_bsd(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 _getcpucount_impl(void) {
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if (!IsWindows()) {
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if (!IsBsd()) {
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return _getcpucount_linux();
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} else {
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return _getcpucount_bsd();
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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 _getcpucount_init(void) {
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g_cpucount = _getcpucount_impl();
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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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* This is the same as the standard interface:
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*
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* sysconf(_SC_NPROCESSORS_ONLN);
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*
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* Except this function isn't a bloated diamond dependency.
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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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