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sx: retry hard shared unlock just like in r327905 for rwlocks

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This commit is contained in:
Mateusz Guzik 2018-01-13 09:26:24 +00:00
parent b23dbcb8ae
commit 1b54ffc8d2
1 changed files with 4 additions and 1 deletions
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5
sys/kern/kern_sx.c
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@ -1193,7 +1193,7 @@ _sx_sunlock_try(struct sx *sx, uintptr_t *xp)
static void __noinline
_sx_sunlock_hard(struct sx *sx, uintptr_t x LOCK_FILE_LINE_ARG_DEF)
{
int wakeup_swapper;
int wakeup_swapper = 0;
uintptr_t setx;
if (SCHEDULER_STOPPED())
@ -1213,6 +1213,9 @@ _sx_sunlock_hard(struct sx *sx, uintptr_t x LOCK_FILE_LINE_ARG_DEF)
for (;;) {
MPASS(x & SX_LOCK_EXCLUSIVE_WAITERS);
MPASS(!(x & SX_LOCK_SHARED_WAITERS));
if (_sx_sunlock_try(sx, &x))
break;
/*
* Wake up semantic here is quite simple:
* Just wake up all the exclusive waiters.