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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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4
tool/net/redbean.c
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@ -6496,14 +6496,14 @@ static int MemoryMonitor(void *arg) {
mi[2].x = (intptr_t)_edata >> 16;
mi[2].size = _end - _edata;
mi[2].flags = 0;
_spinlock(&_mmi.lock);
__mmi_lock();
if (_mmi.i == intervals - 3) {
memcpy(mi + 3, _mmi.p, _mmi.i * sizeof(*mi));
ok = true;
} else {
ok = false;
}
_spunlock(&_mmi.lock);
__mmi_unlock();
if (!ok) {
VERBOSEF("(memv) retrying due to contention on mmap table");
continue;