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LightLock: avoid the svcArbitrateAddress() call if no thread is waiting

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fincs 2015-09-30 22:39:57 +02:00
parent abd104fae7
commit 9e43411a0e
1 changed files with 9 additions and 2 deletions
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11
libctru/source/synchronization.c
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@ -33,7 +33,7 @@ _begin:
if (val < 0) if (val < 0)
{ {
__clrex(); __clrex();
svcArbitrateAddress(arbiter, (u32)lock, ARBITRATION_WAIT_IF_LESS_THAN, 0, 0); svcArbitrateAddress(arbiter, (u32)lock, ARBITRATION_DECREMENT_AND_WAIT_IF_LESS_THAN, 0, 0);
goto _begin; // Try locking again goto _begin; // Try locking again
} }
} while (__strex(lock, -val)); } while (__strex(lock, -val));
@ -45,7 +45,14 @@ void LightLock_Unlock(LightLock* lock)
do do
val = -__ldrex(lock); val = -__ldrex(lock);
while (__strex(lock, val)); while (__strex(lock, val));
svcArbitrateAddress(arbiter, (u32)lock, ARBITRATION_SIGNAL, 1, 0); if (val > 1)
{
// Wake up exactly one thread
do
val = __ldrex(lock);
while (__strex(lock, val-1));
svcArbitrateAddress(arbiter, (u32)lock, ARBITRATION_SIGNAL, 1, 0);
}
} }
void RecursiveLock_Init(RecursiveLock* lock) void RecursiveLock_Init(RecursiveLock* lock)