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Make fixes and improvements

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- Introduce __assert_disable global
- Improve strsignal() thread safety
- Make system call tracing thread safe
- Fix SO_RCVTIMEO / SO_SNDTIMEO on Windows
- Refactor DescribeFoo() functions into one place
- Fix fork() on Windows when TLS and MAP_STACK exist
- Round upwards in setsockopt(SO_RCVTIMEO) on Windows
- Disable futexes on OpenBSD which seem extremely broken
- Implement a better kludge for monotonic time on Windows
This commit is contained in:
Justine Tunney 2022-06-25 18:17:31 -07:00
parent 5d837c4e7c
commit fbc053e018
186 changed files with 1836 additions and 1325 deletions
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14
libc/intrin/pthread_mutex_lock.c
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@ -16,6 +16,7 @@
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/assert.h"
#include "libc/bits/asmflag.h"
#include "libc/bits/atomic.h"
#include "libc/calls/calls.h"
@ -29,15 +30,16 @@
#include "libc/sysv/consts/futex.h"
#include "libc/sysv/consts/nr.h"
static int pthread_mutex_lock_spin(pthread_mutex_t *mutex, int tries) {
static int pthread_mutex_lock_spin(pthread_mutex_t *mutex, int expect,
int tries) {
volatile int i;
if (tries < 7) {
for (i = 0; i != 1 << tries; i++) {
}
tries++;
} else if (IsLinux() || IsOpenbsd()) {
} else if (IsLinux() /* || IsOpenbsd() */) {
atomic_fetch_add(&mutex->waits, 1);
_futex_wait(&mutex->lock, 1, &(struct timespec){1});
_futex_wait(&mutex->lock, expect, &(struct timespec){1});
atomic_fetch_sub(&mutex->waits, 1);
} else {
sched_yield();
@ -64,7 +66,7 @@ int(pthread_mutex_lock)(pthread_mutex_t *mutex) {
!atomic_exchange_explicit(&mutex->lock, 1, memory_order_acquire)) {
break;
}
tries = pthread_mutex_lock_spin(mutex, tries);
tries = pthread_mutex_lock_spin(mutex, 1, tries);
}
return 0;
case PTHREAD_MUTEX_RECURSIVE:
@ -79,14 +81,16 @@ int(pthread_mutex_lock)(pthread_mutex_t *mutex) {
if (mutex->attr != PTHREAD_MUTEX_ERRORCHECK) {
break;
} else {
assert(!"dead lock");
return EDEADLK;
}
}
tries = pthread_mutex_lock_spin(mutex, tries);
tries = pthread_mutex_lock_spin(mutex, owner, tries);
}
++mutex->reent;
return 0;
default:
assert(!"inva lock");
return EINVAL;
}
}