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Improve pthread_join()

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Since we're now on Windows 8, we can have clone() work as advertised on
Windows, where it sends a futex wake to the child tid. It's also likely
we no longer need to work around thread flakes on OpenBSD, in _wait0().
This commit is contained in:
Justine Tunney 2022-09-16 14:02:06 -07:00
parent 3733b43a8f
commit 994e1f4386
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GPG key ID: BE714B4575D6E328
19 changed files with 154 additions and 74 deletions
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45
libc/intrin/bt.c Normal file
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@ -0,0 +1,45 @@
/*-*- 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/errno.h"
#include "libc/intrin/intrin.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/weaken.h"
#include "libc/log/backtrace.internal.h"
/**
* Shows backtrace if crash reporting facilities are linked.
*/
void _bt(const char *fmt, ...) {
int e;
va_list va;
if (fmt) {
va_start(va, fmt);
kvprintf(fmt, va);
va_end(va);
}
if (_weaken(ShowBacktrace)) {
e = errno;
_weaken(ShowBacktrace)(2, __builtin_frame_address(0));
errno = e;
} else {
kprintf("_bt() can't show backtrace because you need:\n"
"\tSTATIC_YOINK(\"ShowBacktrace\");\n"
"to be linked.\n");
}
}

1
libc/intrin/pthread_getspecific.c
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@ -16,7 +16,6 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/thread.h"
#include "libc/thread/tls.h"

1
libc/intrin/pthread_setspecific.c
View file

@ -17,7 +17,6 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/errno.h"
#include "libc/thread/posixthread.internal.h"
#include "libc/thread/thread.h"
#include "libc/thread/tls.h"

10
libc/intrin/rand64.c
View file

@ -17,18 +17,18 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/intrin/_getauxval.internal.h"
#include "libc/thread/thread.h"
#include "libc/nexgen32e/rdtsc.h"
#include "libc/thread/tls.h"
#include "libc/runtime/internal.h"
#include "libc/runtime/runtime.h"
#include "libc/str/str.h"
#include "libc/sysv/consts/auxv.h"
#include "libc/thread/thread.h"
#include "libc/thread/tls.h"
static struct {
int thepid;
uint128_t thepool;
pthread_mutex_t lock;
pthread_spinlock_t lock;
} g_rand64;
/**
@ -49,7 +49,7 @@ static struct {
uint64_t rand64(void) {
void *p;
uint128_t s;
if (__threaded) pthread_mutex_lock(&g_rand64.lock);
if (__threaded) pthread_spin_lock(&g_rand64.lock);
if (__pid == g_rand64.thepid) {
s = g_rand64.thepool; // normal path
} else {
@ -70,6 +70,6 @@ uint64_t rand64(void) {
g_rand64.thepid = __pid;
}
g_rand64.thepool = (s *= 15750249268501108917ull); // lemur64
if (__threaded) pthread_mutex_unlock(&g_rand64.lock);
pthread_spin_unlock(&g_rand64.lock);
return s >> 64;
}