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71 lines
1.5 KiB
C
71 lines
1.5 KiB
C
/* ptwinmm.c -- portable timer implementation for win32 */
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#include "porttime.h"
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#include "windows.h"
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#include "time.h"
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TIMECAPS caps;
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static long time_offset = 0;
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static int time_started_flag = FALSE;
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static long time_resolution;
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static MMRESULT timer_id;
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static PtCallback *time_callback;
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void CALLBACK winmm_time_callback(UINT uID, UINT uMsg, DWORD_PTR dwUser,
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DWORD_PTR dw1, DWORD_PTR dw2)
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{
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(*time_callback)(Pt_Time(), (void *) dwUser);
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}
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PMEXPORT PtError Pt_Start(int resolution, PtCallback *callback, void *userData)
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{
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if (time_started_flag) return ptAlreadyStarted;
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timeBeginPeriod(resolution);
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time_resolution = resolution;
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time_offset = timeGetTime();
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time_started_flag = TRUE;
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time_callback = callback;
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if (callback) {
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timer_id = timeSetEvent(resolution, 1, winmm_time_callback,
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(DWORD_PTR) userData, TIME_PERIODIC | TIME_CALLBACK_FUNCTION);
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if (!timer_id) return ptHostError;
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}
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return ptNoError;
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}
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PMEXPORT PtError Pt_Stop()
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{
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if (!time_started_flag) return ptAlreadyStopped;
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if (time_callback && timer_id) {
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timeKillEvent(timer_id);
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time_callback = NULL;
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timer_id = 0;
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}
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time_started_flag = FALSE;
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timeEndPeriod(time_resolution);
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return ptNoError;
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}
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PMEXPORT int Pt_Started()
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{
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return time_started_flag;
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}
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PMEXPORT PtTimestamp Pt_Time()
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{
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return timeGetTime() - time_offset;
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}
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PMEXPORT void Pt_Sleep(int32_t duration)
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{
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Sleep(duration);
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}
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