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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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7
libc/time/localtime.c
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@ -4,6 +4,7 @@
#define LOCALTIME_IMPLEMENTATION
#include "libc/bits/bits.h"
#include "libc/calls/calls.h"
#include "libc/intrin/pthread.h"
#include "libc/intrin/spinlock.h"
#include "libc/mem/mem.h"
#include "libc/runtime/gc.h"
@ -42,15 +43,15 @@ STATIC_YOINK("usr/share/zoneinfo/UTC");
** POSIX-style TZ environment variable handling from Guy Harris.
*/
_Alignas(64) static int locallock;
static pthread_mutex_t locallock;
static int lock(void) {
_spinlock(&locallock);
pthread_mutex_lock(&locallock);
return 0;
}
static void unlock(void) {
_spunlock(&locallock);
pthread_mutex_unlock(&locallock);
}
#ifndef TZ_ABBR_MAX_LEN