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Make posix_spawn faster on Windows

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Justine Tunney 2023-08-20 02:13:02 -07:00
parent d6f72aa4a6
commit ec957491ea
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15 changed files with 514 additions and 123 deletions
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libc/thread/tkill.c Normal file
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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 2022 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/calls/sig.internal.h"
#include "libc/calls/syscall-sysv.internal.h"
#include "libc/calls/syscall_support-nt.internal.h"
#include "libc/dce.h"
#include "libc/errno.h"
#include "libc/intrin/atomic.h"
#include "libc/intrin/dll.h"
#include "libc/intrin/strace.internal.h"
#include "libc/nt/enum/threadaccess.h"
#include "libc/nt/runtime.h"
#include "libc/nt/thread.h"
#include "libc/sysv/consts/sicode.h"
#include "libc/sysv/consts/sig.h"
#include "libc/sysv/errfuns.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/thread.h"
#include "libc/thread/tls.h"
static dontinline textwindows int __tkill_nt(int tid, int sig,
struct CosmoTib *tib) {
// check to see if this is a cosmo posix thread
int rc = 0;
struct Dll *e;
bool found = false;
pthread_spin_lock(&_pthread_lock);
for (e = dll_first(_pthread_list); e; e = dll_next(_pthread_list, e)) {
enum PosixThreadStatus status;
struct PosixThread *pt = POSIXTHREAD_CONTAINER(e);
if (tib && tib != pt->tib) continue;
int other = atomic_load_explicit(&pt->tib->tib_tid, memory_order_acquire);
if (!other || tid != other) continue;
status = atomic_load_explicit(&pt->status, memory_order_acquire);
found = true;
if (status < kPosixThreadTerminated) {
if (sig == SIGKILL) {
intptr_t h;
if ((h = OpenThread(kNtThreadTerminate, false, tid))) {
TerminateThread(h, sig);
CloseHandle(h);
}
atomic_store_explicit(&pt->status, kPosixThreadTerminated,
memory_order_release);
} else {
rc = __sig_add(tid, sig, SI_TKILL);
}
} else {
// already dead but not joined
}
break;
}
pthread_spin_unlock(&_pthread_lock);
if (found) {
return rc;
}
// otherwise try our luck sigkilling a manually made thread
if (!tib) {
intptr_t h;
if ((h = OpenThread(kNtThreadTerminate, false, tid))) {
if (TerminateThread(h, sig)) {
return 0;
} else {
return __winerr();
}
CloseHandle(h);
} else {
return __winerr();
}
} else {
return esrch();
}
}
// OpenBSD has an optional `tib` parameter for extra safety.
int __tkill(int tid, int sig, void *tib) {
int rc;
if (IsLinux() || IsXnu() || IsFreebsd() || IsOpenbsd() || IsNetbsd()) {
rc = sys_tkill(tid, sig, tib);
} else if (IsWindows()) {
rc = __tkill_nt(tid, sig, tib);
} else {
rc = enosys();
}
STRACE("tkill(%d, %G) → %d% m", tid, sig, rc);
return rc;
}
/**
* Kills thread.
*
* @param tid is thread id
* @param sig does nothing on xnu
* @return 0 on success, or -1 w/ errno
* @raise EAGAIN if `RLIMIT_SIGPENDING` was exceeded
* @raise EINVAL if `tid` or `sig` were invalid
* @raise ESRCH if no such `tid` existed
* @raise EPERM if permission was denied
* @asyncsignalsafe
*/
int tkill(int tid, int sig) {
return __tkill(tid, sig, 0);
}