AuroraSupport/AuroraRuntime
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[*] improve latency (i think - benchmark pending)

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This commit is contained in:
Reece Wilson 2023-06-07 11:45:14 +01:00
parent 8667d1059f
commit 50f25e147a
1 changed files with 7 additions and 0 deletions
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7
Source/Threading/Primitives/AuConditionVariable.NT.cpp
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@ -16,6 +16,9 @@
#define NTSTATUS_TIMEOUT 0x102
#endif
// TODO: benchmark
#define AUBUILD_REMOVE_PREHOG
namespace Aurora::Threading::Primitives
{
ConditionVariableImpl::ConditionVariableImpl(const AuSPtr<IConditionMutex> &pMutex) :
@ -84,6 +87,7 @@ namespace Aurora::Threading::Primitives
this->mutex_->Unlock();
#if !defined(AUBUILD_REMOVE_PREHOG)
// forced smt stall
// see the "hopefully nt is smart enough" comment
// the idea is to prevent windows from taking away our time-slice in a preemptive manor
@ -93,6 +97,7 @@ namespace Aurora::Threading::Primitives
bool b = true;
bIOU = CheckOut(b);
}
#endif
bRet = pNtWaitForKeyedEvent(gKeyedEventHandle, &this->wlist, 0, &word) != NTSTATUS_TIMEOUT;
@ -179,12 +184,14 @@ namespace Aurora::Threading::Primitives
this->mutex_->Unlock();
#if !defined(AUBUILD_REMOVE_PREHOG)
// forced smp stall
if (!bIOU)
{
bool b = true;
bIOU = CheckOut(b);
}
#endif
// then into the kernel no matter what (hopefully nt is smart enough to have a fast path)
pNtWaitForKeyedEvent(gKeyedEventHandle, &this->wlist, 0, nullptr);