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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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5
libc/stdio/flushlbf.c
View file

@ -17,6 +17,7 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/calls.h"
#include "libc/intrin/pthread.h"
#include "libc/intrin/spinlock.h"
#include "libc/stdio/fflush.internal.h"
#include "libc/stdio/stdio.h"
@ -28,7 +29,7 @@
void _flushlbf(void) {
int i;
FILE *f;
_spinlock(&__fflush.lock);
pthread_mutex_lock(&__fflush.lock);
for (i = 0; i < __fflush.handles.i; ++i) {
if ((f = __fflush.handles.p[i])) {
flockfile(f);
@ -38,5 +39,5 @@ void _flushlbf(void) {
funlockfile(f);
}
}
_spunlock(&__fflush.lock);
pthread_mutex_unlock(&__fflush.lock);
}