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Make locks more reliable

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This change switches most of the core locks to be re-entrant, in order
to reduce the chance of deadlocking code that does, clever things with
asynchronous signal handlers. This change implements it it in pthreads
so we're one step closer to having a standardized threading primitives
This commit is contained in:
Justine Tunney 2022-06-11 01:59:26 -07:00
parent 5ea618f0af
commit c260345e06
35 changed files with 369 additions and 258 deletions
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11
libc/intrin/asan.c
View file

@ -31,6 +31,7 @@
#include "libc/intrin/kprintf.h"
#include "libc/intrin/lockcmpxchg.h"
#include "libc/intrin/nomultics.internal.h"
#include "libc/intrin/pthread.h"
#include "libc/intrin/spinlock.h"
#include "libc/log/backtrace.internal.h"
#include "libc/log/internal.h"
@ -169,7 +170,7 @@ struct ReportOriginHeap {
};
static int __asan_noreentry;
_Alignas(64) static int __asan_lock;
static pthread_mutex_t __asan_lock;
static struct AsanMorgue __asan_morgue;
#define __asan_unreachable() \
@ -852,25 +853,25 @@ dontdiscard __asan_die_f *__asan_report_memory_fault(void *addr, int size,
void *__asan_morgue_add(void *p) {
int i;
void *r;
_spinlock_cooperative(&__asan_lock);
pthread_mutex_lock(&__asan_lock);
i = __asan_morgue.i++ & (ARRAYLEN(__asan_morgue.p) - 1);
r = __asan_morgue.p[i];
__asan_morgue.p[i] = p;
_spunlock(&__asan_lock);
pthread_mutex_unlock(&__asan_lock);
return r;
}
static void __asan_morgue_flush(void) {
int i;
void *p;
_spinlock_cooperative(&__asan_lock);
pthread_mutex_lock(&__asan_lock);
for (i = 0; i < ARRAYLEN(__asan_morgue.p); ++i) {
if (__asan_morgue.p[i] && weaken(dlfree)) {
weaken(dlfree)(__asan_morgue.p[i]);
}
__asan_morgue.p[i] = 0;
}
_spunlock(&__asan_lock);
pthread_mutex_unlock(&__asan_lock);
}
static size_t __asan_user_size(size_t n) {