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Make windows sleep consistent with non-windows sleep #2382

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Nov 28, 2017
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Make windows sleep consistent with non-windows sleep #2382

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27 changes: 24 additions & 3 deletions src/libponyrt/sched/cpu.c
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Original file line number Diff line number Diff line change
Expand Up @@ -297,34 +297,55 @@ void ponyint_cpu_core_pause(uint64_t tsc, uint64_t tsc2, bool yield)
if((tsc2 - tsc) < 10000000)
return;

#ifndef PLATFORM_IS_WINDOWS
#ifdef PLATFORM_IS_WINDOWS
DWORD ts = 0;
#else
struct timespec ts = {0, 0};
#endif

if(yield)
{
// A billion cycles is roughly half a second, depending on clock speed.
if((tsc2 - tsc) > 10000000000)
{
// If it has been 10 billion cycles, pause 30 ms.
#ifdef PLATFORM_IS_WINDOWS
ts = 30;
#else
ts.tv_nsec = 30000000;
#endif
} else if((tsc2 - tsc) > 3000000000) {
// If it has been 3 billion cycles, pause 10 ms.
#ifdef PLATFORM_IS_WINDOWS
ts = 10;
#else
ts.tv_nsec = 10000000;
#endif
} else if((tsc2 - tsc) > 1000000000) {
// If it has been 1 billion cycles, pause 1 ms.
#ifdef PLATFORM_IS_WINDOWS
ts = 1;
#else
ts.tv_nsec = 1000000;
#endif
}
else
{
#ifdef PLATFORM_IS_WINDOWS
// Otherwise, pause for 1 ms (minimum on windows)
ts = 1;
#else
// Otherwise, pause for 100 microseconds
ts.tv_nsec = 100000;
#endif
}
}

#ifdef PLATFORM_IS_WINDOWS
Sleep(ts);
#else
DTRACE1(CPU_NANOSLEEP, ts.tv_nsec);
nanosleep(&ts, NULL);
#else
Sleep(yield ? 1 : 0);
#endif
}

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