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do not wait 1 msec in suspension.

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vsadov 2022-08-18 08:20:30 -07:00
parent 329ac704f9
commit cc59888b35
1 changed files with 29 additions and 0 deletions
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29
src/coreclr/vm/threadsuspend.cpp
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@ -3252,6 +3252,35 @@ COR_PRF_SUSPEND_REASON GCSuspendReasonToProfSuspendReason(ThreadSuspend::SUSPEND
}
#endif // PROFILING_SUPPORTED
// exponential spinwait with an approximate time limit for waiting in microsecond range.
// when iteration == -1, only usecLimit is used
void SpinWait(int iteration, int usecLimit)
{
LARGE_INTEGER li;
QueryPerformanceCounter(&li);
int64_t startTicks = li.QuadPart;
QueryPerformanceFrequency(&li);
int64_t ticksPerSecond = li.QuadPart;
int64_t endTicks = startTicks + (usecLimit * ticksPerSecond) / 1000000;
int l = min((unsigned)iteration, 30);
for (int i = 0; i < l; i++)
{
for (int j = 0; j < (1 << i); j++)
{
System_YieldProcessor();
}
QueryPerformanceCounter(&li);
int64_t currentTicks = li.QuadPart;
if (currentTicks > endTicks)
{
break;
}
}
}
//************************************************************************************
//
// SuspendRuntime is responsible for ensuring that all managed threads reach a