Author: mjg
Date: Sat Jan 13 09:26:24 2018
New Revision: 327914
URL: https://svnweb.freebsd.org/changeset/base/327914
Log:
sx: retry hard shared unlock just like in r327905 for rwlocks
Modified:
head/sys/kern/kern_sx.c
Modified: head/sys/kern/kern_sx.c
==============================================================================
--- head/sys/kern/kern_sx.c Sat Jan 13 08:28:46 2018 (r327913)
+++ head/sys/kern/kern_sx.c Sat Jan 13 09:26:24 2018 (r327914)
@@ -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_
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.
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