77 lines
3.7 KiB
C
77 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 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/bits/safemacros.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/limits.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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static textwindows noinline int sched_setaffinity$nt(int pid,
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uint64_t bitsetsize,
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const void *bitset) {
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int rc;
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uintptr_t mask;
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int64_t handle;
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typeof(SetThreadAffinityMask) *SetAffinityMask = SetThreadAffinityMask;
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mask = 0;
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memcpy(&mask, bitset, min(bitsetsize, sizeof(uintptr_t)));
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handle = 0;
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if (!pid) pid = GetCurrentThreadId();
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if (0 < pid && pid <= UINT32_MAX) {
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if (pid == GetCurrentProcessId()) {
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pid = GetCurrentProcess();
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SetAffinityMask = SetProcessAffinityMask;
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} else if (pid == GetCurrentThreadId()) {
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pid = GetCurrentThread();
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} else {
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handle = OpenThread(kNtThreadSetInformation | kNtThreadQueryInformation,
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false, pid);
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if (!handle) {
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handle = OpenProcess(
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kNtProcessSetInformation | kNtProcessQueryInformation, false, pid);
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SetAffinityMask = SetProcessAffinityMask;
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}
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}
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}
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rc = SetAffinityMask(handle ? handle : pid, mask) ? 0 : winerr();
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if (handle) CloseHandle(handle);
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return rc;
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}
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/**
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* Asks kernel to only schedule process on particular CPUs.
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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 bitsetsize is byte length of bitset
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* @param bitset can be manipulated using bt(), bts(), etc.
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* @return 0 on success, or -1 w/ errno
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*/
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int sched_setaffinity(int pid, uint64_t bitsetsize, const void *bitset) {
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if (!IsWindows()) {
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return sched_setaffinity$sysv(pid, bitsetsize, bitset);
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} else {
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return sched_setaffinity$nt(pid, bitsetsize, bitset);
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}
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}
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