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better win32 timers - use win32 event to wake up cpu in idle mode (kazu) 

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@1885 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
bellard 2006-05-01 13:23:04 +00:00
parent eade0f192e
commit 06d9f2f7d4
1 changed files with 61 additions and 12 deletions
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73
vl.c
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@ -518,9 +518,15 @@ int64_t cpu_get_real_ticks(void)
int64_t cpu_get_real_ticks(void)
{
#ifdef _WIN32
LARGE_INTEGER ti;
QueryPerformanceCounter(&ti);
return ti.QuadPart;
#else
int64_t val;
asm volatile ("rdtsc" : "=A" (val));
return val;
#endif
}
#elif defined(__x86_64__)
@ -598,17 +604,26 @@ void cpu_disable_ticks(void)
}
}
#ifdef _WIN32
void cpu_calibrate_ticks(void)
{
LARGE_INTEGER freq;
int ret;
ret = QueryPerformanceFrequency(&freq);
if (ret == 0) {
fprintf(stderr, "Could not calibrate ticks\n");
exit(1);
}
ticks_per_sec = freq.QuadPart;
}
#else
static int64_t get_clock(void)
{
#ifdef _WIN32
struct _timeb tb;
_ftime(&tb);
return ((int64_t)tb.time * 1000 + (int64_t)tb.millitm) * 1000;
#else
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000LL + tv.tv_usec;
#endif
}
void cpu_calibrate_ticks(void)
@ -617,15 +632,12 @@ void cpu_calibrate_ticks(void)
usec = get_clock();
ticks = cpu_get_real_ticks();
#ifdef _WIN32
Sleep(50);
#else
usleep(50 * 1000);
#endif
usec = get_clock() - usec;
ticks = cpu_get_real_ticks() - ticks;
ticks_per_sec = (ticks * 1000000LL + (usec >> 1)) / usec;
}
#endif /* !_WIN32 */
/* compute with 96 bit intermediate result: (a*b)/c */
uint64_t muldiv64(uint64_t a, uint32_t b, uint32_t c)
@ -673,6 +685,8 @@ QEMUClock *vm_clock;
static QEMUTimer *active_timers[2];
#ifdef _WIN32
static MMRESULT timerID;
static HANDLE host_alarm = NULL;
static unsigned int period = 1;
#else
/* frequency of the times() clock tick */
static int timer_freq;
@ -895,6 +909,9 @@ static void host_alarm_handler(int host_signum)
qemu_get_clock(vm_clock)) ||
qemu_timer_expired(active_timers[QEMU_TIMER_REALTIME],
qemu_get_clock(rt_clock))) {
#ifdef _WIN32
SetEvent(host_alarm);
#endif
CPUState *env = cpu_single_env;
if (env) {
/* stop the currently executing cpu because a timer occured */
@ -955,8 +972,15 @@ static void init_timers(void)
#ifdef _WIN32
{
int count=0;
TIMECAPS tc;
ZeroMemory(&tc, sizeof(TIMECAPS));
timeGetDevCaps(&tc, sizeof(TIMECAPS));
if (period < tc.wPeriodMin)
period = tc.wPeriodMin;
timeBeginPeriod(period);
timerID = timeSetEvent(1, // interval (ms)
0, // resolution
period, // resolution
host_alarm_handler, // function
(DWORD)&count, // user parameter
TIME_PERIODIC | TIME_CALLBACK_FUNCTION);
@ -964,6 +988,12 @@ static void init_timers(void)
perror("failed timer alarm");
exit(1);
}
host_alarm = CreateEvent(NULL, FALSE, FALSE, NULL);
if (!host_alarm) {
perror("failed CreateEvent");
exit(1);
}
ResetEvent(host_alarm);
}
pit_min_timer_count = ((uint64_t)10000 * PIT_FREQ) / 1000000;
#else
@ -1023,6 +1053,11 @@ void quit_timers(void)
{
#ifdef _WIN32
timeKillEvent(timerID);
timeEndPeriod(period);
if (host_alarm) {
CloseHandle(host_alarm);
host_alarm = NULL;
}
#endif
}
@ -4383,7 +4418,21 @@ void main_loop_wait(int timeout)
}
#ifdef _WIN32
if (ret == 0 && timeout > 0) {
Sleep(timeout);
int err;
HANDLE hEvents[1];
hEvents[0] = host_alarm;
ret = WaitForMultipleObjects(1, hEvents, FALSE, timeout);
switch(ret) {
case WAIT_OBJECT_0 + 0:
break;
case WAIT_TIMEOUT:
break;
default:
err = GetLastError();
fprintf(stderr, "Wait error %d %d\n", ret, err);
break;
}
}
#endif
/* poll any events */