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/*
* RTS periodic timers.
*
*/
#define _WIN32_WINNT 0x0501
#include "Rts.h"
#include "Ticker.h"
#include <windows.h>
#include <stdio.h>
#include <process.h>
static TickProc tick_proc = NULL;
static HANDLE timer_queue = NULL;
static HANDLE timer = NULL;
static Time tick_interval = 0;
static VOID CALLBACK tick_callback(
PVOID lpParameter STG_UNUSED,
BOOLEAN TimerOrWaitFired STG_UNUSED
)
{
tick_proc(0);
}
// We use the CreateTimerQueue() API which has been around since
// Windows 2000. Apparently it gives bad results before Windows 7,
// though: http://www.virtualdub.org/blog/pivot/entry.php?id=272
//
// Even with the improvements in Windows 7, this timer isn't going to
// be very useful for profiling with a max usable resolution of
// 15ms. Unfortunately we don't have anything better.
void
initTicker (Time interval, TickProc handle_tick)
{
tick_interval = interval;
tick_proc = handle_tick;
timer_queue = CreateTimerQueue();
if (timer_queue == NULL) {
sysErrorBelch("CreateTimerQueue");
stg_exit(EXIT_FAILURE);
}
}
void
startTicker(void)
{
BOOL r;
r = CreateTimerQueueTimer(&timer,
timer_queue,
tick_callback,
0,
0,
TimeToUS(tick_interval) / 1000, // ms
WT_EXECUTEINTIMERTHREAD);
if (r == 0) {
sysErrorBelch("CreateTimerQueueTimer");
stg_exit(EXIT_FAILURE);
}
}
void
stopTicker(void)
{
if (timer_queue != NULL && timer != NULL) {
DeleteTimerQueueTimer(timer_queue, timer, NULL);
timer = NULL;
}
}
void
exitTicker (rtsBool wait)
{
if (timer_queue != NULL) {
DeleteTimerQueueEx(timer_queue, wait ? INVALID_HANDLE_VALUE : NULL);
timer_queue = NULL;
}
}
// Local Variables:
// mode: C
// fill-column: 80
// indent-tabs-mode: nil
// c-basic-offset: 4
// buffer-file-coding-system: utf-8-unix
// End:
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