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libwinpr-synch: fix broken USleep (on WIN32)

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Also reduce CPU usage by reducing the max busy-looping time to 1ms
This commit is contained in:
Norbert Federa 2013-06-25 16:33:40 +02:00
parent f670bce3c5
commit 786df03bb6
1 changed files with 15 additions and 9 deletions
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24
winpr/libwinpr/synch/sleep.c
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@ -52,17 +52,23 @@ VOID USleep(DWORD dwMicroseconds)
#ifndef _WIN32
usleep(dwMicroseconds);
#else
UINT64 t1;
UINT64 t2;
UINT64 freq;
static LARGE_INTEGER freq = { 0, 0 };
LARGE_INTEGER t1 = { 0, 0 };
LARGE_INTEGER t2 = { 0, 0 };
QueryPerformanceCounter((LARGE_INTEGER*) &t1);
QueryPerformanceCounter((LARGE_INTEGER*) &freq);
QueryPerformanceCounter(&t1);
do
{
QueryPerformanceCounter((LARGE_INTEGER*) &t2);
if (freq.QuadPart == 0) {
QueryPerformanceFrequency(&freq);
}
while ((t2 - t1) < dwMicroseconds);
// in order to save cpu cyles we use Sleep() for the large share ...
if (dwMicroseconds >= 1000) {
Sleep(dwMicroseconds/1000);
}
// ... and busy loop until all the requested micro seconds have passed
do {
QueryPerformanceCounter(&t2);
} while (((t2.QuadPart - t1.QuadPart)*1000000)/freq.QuadPart < dwMicroseconds);
#endif
}