This is a maintenance fork
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program is distributed in the hope that it will be useful, but │
│ WITHOUT ANY WARRANTY; without even the implied warranty of │
│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/bits/safemacros.h"
#include "libc/calls/calls.h"
#include "libc/calls/internal.h"
#include "libc/dce.h"
#include "libc/limits.h"
#include "libc/nt/enum/processaccess.h"
#include "libc/nt/enum/threadaccess.h"
#include "libc/nt/process.h"
#include "libc/nt/runtime.h"
#include "libc/nt/thread.h"
#include "libc/str/str.h"
static textwindows noinline int sched_setaffinity$nt(int pid,
uint64_t bitsetsize,
const void *bitset) {
int rc;
uintptr_t mask;
int64_t handle;
typeof(SetThreadAffinityMask) *SetAffinityMask = SetThreadAffinityMask;
mask = 0;
memcpy(&mask, bitset, min(bitsetsize, sizeof(uintptr_t)));
handle = 0;
if (!pid) pid = GetCurrentThreadId();
if (0 < pid && pid <= UINT32_MAX) {
if (pid == GetCurrentProcessId()) {
pid = GetCurrentProcess();
SetAffinityMask = SetProcessAffinityMask;
} else if (pid == GetCurrentThreadId()) {
pid = GetCurrentThread();
} else {
handle = OpenThread(kNtThreadSetInformation | kNtThreadQueryInformation,
false, pid);
if (!handle) {
handle = OpenProcess(
kNtProcessSetInformation | kNtProcessQueryInformation, false, pid);
SetAffinityMask = SetProcessAffinityMask;
}
}
}
rc = SetAffinityMask(handle ? handle : pid, mask) ? 0 : __winerr();
if (handle) CloseHandle(handle);
return rc;
}
/**
* Asks kernel to only schedule process on particular CPUs.
*
* @param pid is the process or thread id (or 0 for caller)
* @param bitsetsize is byte length of bitset
* @return 0 on success, or -1 w/ errno
*/
int sched_setaffinity(int pid, uint64_t bitsetsize, const void *bitset) {
if (!IsWindows()) {
return sched_setaffinity$sysv(pid, bitsetsize, bitset);
} else {
return sched_setaffinity$nt(pid, bitsetsize, bitset);
}
}