#endif
}
+
+
#ifdef WIN32
# define HAVE_TIMEGETTIME 1
# define HAVE_QUERYPERFORMANCECOUNTER 1
+# define HAVE_WIN32_USLEEP 1
# define HAVE_Sleep 1
-#endif
-
-#ifndef WIN32
-#if defined(CLOCK_MONOTONIC) || defined(CLOCK_HIRES)
-# define HAVE_CLOCKGETTIME 1
-#endif
-// FIXME improve this check, manpage hints to DST_NONE
-# define HAVE_GETTIMEOFDAY 1
+#else
+# if defined(CLOCK_MONOTONIC) || defined(CLOCK_HIRES)
+# define HAVE_CLOCKGETTIME 1
+# endif
+# if _POSIX_VERSION >= 200112L
+// MacOS advertises POSIX support but doesn't implement clock_nanosleep().
+// POSIX deprecated and removed usleep() so select() seems like a safer choice.
+# if defined(MACOSX)
+# define HAVE_SELECT_POSIX 1
+# else
+# define HAVE_CLOCK_NANOSLEEP 1
+# endif
+# endif
#endif
#ifdef FD_SET
# define HAVE_SELECT 1
#endif
-#ifndef WIN32
-// FIXME improve this check
-# define HAVE_USLEEP 1
-#endif
-
// these are referenced elsewhere
cvar_t sys_usenoclockbutbenchmark = {CF_SHARED, "sys_usenoclockbutbenchmark", "0", "don't use ANY real timing, and simulate a clock (for benchmarking); the game then runs as fast as possible. Run a QC mod with bots that does some stuff, then does a quit at the end, to benchmark a server. NEVER do this on a public server."};
cvar_t sys_libdir = {CF_READONLY | CF_SHARED, "sys_libdir", "", "Default engine library directory"};
// these are not
static cvar_t sys_debugsleep = {CF_SHARED, "sys_debugsleep", "0", "write requested and attained sleep times to standard output, to be used with gnuplot"};
-static cvar_t sys_usesdlgetticks = {CF_SHARED, "sys_usesdlgetticks", "0", "use SDL_GetTicks() timer (less accurate, for debugging)"};
-static cvar_t sys_usesdldelay = {CF_SHARED, "sys_usesdldelay", "0", "use SDL_Delay() (less accurate, for debugging)"};
+static cvar_t sys_usesdlgetticks = {CF_SHARED, "sys_usesdlgetticks", "0", "use SDL_GetTicks() timer (low precision, for debugging)"};
+static cvar_t sys_usesdldelay = {CF_SHARED, "sys_usesdldelay", "0", "use SDL_Delay() (low precision, for debugging)"};
#if HAVE_QUERYPERFORMANCECOUNTER
-static cvar_t sys_usequeryperformancecounter = {CF_SHARED | CF_ARCHIVE, "sys_usequeryperformancecounter", "0", "use windows QueryPerformanceCounter timer (which has issues on multicore/multiprocessor machines and processors which are designed to conserve power) for timing rather than timeGetTime function (which has issues on some motherboards)"};
-#endif
-#if HAVE_CLOCKGETTIME
-static cvar_t sys_useclockgettime = {CF_SHARED | CF_ARCHIVE, "sys_useclockgettime", "1", "use POSIX clock_gettime function (not adjusted by NTP on some older Linux kernels) for timing rather than gettimeofday (which has issues if the system time is stepped by ntpdate, or apparently on some Xen installations)"};
+static cvar_t sys_usequeryperformancecounter = {CF_SHARED | CF_ARCHIVE, "sys_usequeryperformancecounter", "1", "use windows QueryPerformanceCounter timer (which has issues on systems lacking constant-rate TSCs synchronised across all cores, such as ancient PCs or VMs) for timing rather than timeGetTime function (which is low precision and had issues on some old motherboards)"};
#endif
static cvar_t sys_stdout = {CF_SHARED, "sys_stdout", "1", "0: nothing is written to stdout (-nostdout cmdline option sets this), 1: normal messages are written to stdout, 2: normal messages are written to stderr (-stderr cmdline option sets this)"};
Cvar_RegisterVariable(&sys_debugsleep);
Cvar_RegisterVariable(&sys_usenoclockbutbenchmark);
Cvar_RegisterVariable(&sys_libdir);
-#if HAVE_TIMEGETTIME || HAVE_QUERYPERFORMANCECOUNTER || HAVE_CLOCKGETTIME || HAVE_GETTIMEOFDAY
+#if HAVE_TIMEGETTIME || HAVE_QUERYPERFORMANCECOUNTER || HAVE_CLOCKGETTIME
if(sys_supportsdlgetticks)
{
Cvar_RegisterVariable(&sys_usesdlgetticks);
#if HAVE_QUERYPERFORMANCECOUNTER
Cvar_RegisterVariable(&sys_usequeryperformancecounter);
#endif
-#if HAVE_CLOCKGETTIME
- Cvar_RegisterVariable(&sys_useclockgettime);
-#endif
+
Cvar_RegisterVariable(&sys_stdout);
Cvar_RegisterCallback(&sys_stdout, Sys_UpdateOutFD_c);
#ifndef WIN32
#endif
}
+#ifdef WIN32
+static LARGE_INTEGER PerformanceFreq;
+/// Windows default timer resolution is only 15.625ms,
+/// this affects (at least) timeGetTime() and all forms of sleeping.
+static void Sys_SetTimerResolution(void)
+{
+ NTSTATUS(NTAPI *qNtQueryTimerResolution)(OUT PULONG MinRes, OUT PULONG MaxRes, OUT PULONG CurrentRes);
+ NTSTATUS(NTAPI *qNtSetTimerResolution)(IN ULONG DesiredRes, IN BOOLEAN SetRes, OUT PULONG ActualRes);
+ const char* ntdll_names [] =
+ {
+ "ntdll.dll",
+ NULL
+ };
+ dllfunction_t ntdll_funcs[] =
+ {
+ {"NtQueryTimerResolution", (void **) &qNtQueryTimerResolution},
+ {"NtSetTimerResolution", (void **) &qNtSetTimerResolution},
+ {NULL, NULL}
+ };
+ dllhandle_t ntdll;
+ unsigned long WorstRes, BestRes, CurrentRes;
+
+ timeBeginPeriod(1); // 1ms, documented
+
+ // the best Windows can manage (typically 0.5ms)
+ // http://undocumented.ntinternals.net/index.html?page=UserMode%2FUndocumented%20Functions%2FTime%2FNtSetTimerResolution.html
+ if (Sys_LoadDependency(ntdll_names, &ntdll, ntdll_funcs))
+ {
+ qNtQueryTimerResolution(&WorstRes, &BestRes, &CurrentRes); // no pointers may be NULL
+ if (CurrentRes > BestRes)
+ qNtSetTimerResolution(BestRes, true, &CurrentRes);
+
+ Sys_FreeLibrary(&ntdll);
+ }
+
+ // Microsoft says the freq is fixed at boot and consistent across all processors
+ // and that it need only be queried once and cached.
+ QueryPerformanceFrequency (&PerformanceFreq);
+}
+#endif // WIN32
+
double Sys_DirtyTime(void)
{
// first all the OPTIONAL timers
Sys_Error("sys_usenoclockbutbenchmark cannot run any longer, sorry");
return benchmark_time * 0.000001;
}
+
+ if(sys_supportsdlgetticks && sys_usesdlgetticks.integer)
+ return (double) Sys_SDL_GetTicks() / 1000.0;
+
#if HAVE_QUERYPERFORMANCECOUNTER
if (sys_usequeryperformancecounter.integer)
{
- // LadyHavoc: note to people modifying this code, DWORD is specifically defined as an unsigned 32bit number, therefore the 65536.0 * 65536.0 is fine.
// QueryPerformanceCounter
// platform:
// Windows 95/98/ME/NT/2000/XP
// features:
- // very accurate (CPU cycles)
+ // + very accurate (constant-rate TSCs on modern systems)
// known issues:
- // does not necessarily match realtime too well (tends to get faster and faster in win98)
- // wraps around occasionally on some platforms (depends on CPU speed and probably other unknown factors)
- double timescale;
- LARGE_INTEGER PerformanceFreq;
+ // - does not necessarily match realtime too well (tends to get faster and faster in win98)
+ // - wraps around occasionally on some platforms (depends on CPU speed and probably other unknown factors)
+ // - higher access latency on Vista
+ // Microsoft says on Win 7 or later, latency and overhead are very low, synchronisation is excellent.
LARGE_INTEGER PerformanceCount;
- if (QueryPerformanceFrequency (&PerformanceFreq))
+ if (PerformanceFreq.QuadPart)
{
QueryPerformanceCounter (&PerformanceCount);
-
- timescale = 1.0 / ((double) PerformanceFreq.LowPart + (double) PerformanceFreq.HighPart * 65536.0 * 65536.0);
- return ((double) PerformanceCount.LowPart + (double) PerformanceCount.HighPart * 65536.0 * 65536.0) * timescale;
+ return (double)PerformanceCount.QuadPart * (1.0 / (double)PerformanceFreq.QuadPart);
}
else
{
#endif
#if HAVE_CLOCKGETTIME
- if (sys_useclockgettime.integer)
{
struct timespec ts;
-# ifdef CLOCK_MONOTONIC
- // linux
+# ifdef CLOCK_MONOTONIC_RAW
+ // Linux-specific, SDL_GetPerformanceCounter() uses it
+ clock_gettime(CLOCK_MONOTONIC_RAW, &ts);
+# elif defined(CLOCK_MONOTONIC)
+ // POSIX
clock_gettime(CLOCK_MONOTONIC, &ts);
# else
// sunos
#endif
// now all the FALLBACK timers
- if(sys_supportsdlgetticks && sys_usesdlgetticks.integer)
- return (double) Sys_SDL_GetTicks() / 1000.0;
-#if HAVE_GETTIMEOFDAY
- {
- struct timeval tp;
- gettimeofday(&tp, NULL);
- return (double) tp.tv_sec + tp.tv_usec / 1000000.0;
- }
-#elif HAVE_TIMEGETTIME
+#if HAVE_TIMEGETTIME
{
- static int firsttimegettime = true;
// timeGetTime
// platform:
// Windows 95/98/ME/NT/2000/XP
// reasonable accuracy (millisecond)
// issues:
// wraps around every 47 days or so (but this is non-fatal to us, odd times are rejected, only causes a one frame stutter)
-
- // make sure the timer is high precision, otherwise different versions of windows have varying accuracy
- if (firsttimegettime)
- {
- timeBeginPeriod(1);
- firsttimegettime = false;
- }
-
+ // requires Sys_SetTimerResolution()
return (double) timeGetTime() / 1000.0;
}
#else
#endif
}
-extern cvar_t host_maxwait;
double Sys_Sleep(double time)
{
double dt;
- uint32_t microseconds;
-
- // convert to microseconds
- time *= 1000000.0;
+ uint32_t msec, usec, nsec;
- if(host_maxwait.value <= 0)
- time = min(time, 1000000.0);
- else
- time = min(time, host_maxwait.value * 1000.0);
-
- if (time < 1 || host.restless)
+ if (time < 1.0/1000000.0 || host.restless)
return 0; // not sleeping this frame
-
- microseconds = time; // post-validation to prevent overflow
+ if (time >= 1)
+ time = 0.999999; // simpler, also ensures values are in range for all platform APIs
+ msec = time * 1000;
+ usec = time * 1000000;
+ nsec = time * 1000000000;
if(sys_usenoclockbutbenchmark.integer)
{
double old_benchmark_time = benchmark_time;
- benchmark_time += microseconds;
+ benchmark_time += usec;
if(benchmark_time == old_benchmark_time)
Sys_Error("sys_usenoclockbutbenchmark cannot run any longer, sorry");
return 0;
}
if(sys_debugsleep.integer)
- Con_Printf("sys_debugsleep: requesting %u ", microseconds);
+ Con_Printf("sys_debugsleep: requesting %u ", usec);
dt = Sys_DirtyTime();
// less important on newer libcurl so no need to disturb dedicated servers
- if (cls.state != ca_dedicated && Curl_Select(microseconds))
+ if (cls.state != ca_dedicated && Curl_Select(msec))
{
// a transfer is ready or we finished sleeping
}
else if(sys_supportsdlgetticks && sys_usesdldelay.integer)
- Sys_SDL_Delay(microseconds / 1000);
+ Sys_SDL_Delay(msec);
#if HAVE_SELECT
else if (cls.state == ca_dedicated && sv_checkforpacketsduringsleep.integer)
{
#endif
}
}
- tv.tv_sec = microseconds / 1000000;
- tv.tv_usec = microseconds % 1000000;
+ tv.tv_sec = 0;
+ tv.tv_usec = usec;
// on Win32, select() cannot be used with all three FD list args being NULL according to MSDN
// (so much for POSIX...), not with an empty fd_set either.
select(lastfd + 1, &fdreadset, NULL, NULL, &tv);
}
#endif
-#if HAVE_USLEEP
+#if HAVE_CLOCK_NANOSLEEP
else
- usleep(microseconds);
+ {
+ struct timespec ts;
+ ts.tv_sec = 0;
+ ts.tv_nsec = nsec;
+ clock_nanosleep(CLOCK_MONOTONIC, 0, &ts, NULL);
+ }
+#elif HAVE_SELECT_POSIX
+ else
+ {
+ struct timeval tv;
+ tv.tv_sec = 0;
+ tv.tv_usec = usec;
+ select(0, NULL, NULL, NULL, &tv);
+ }
+#elif HAVE_WIN32_USLEEP // Windows XP/2003 minimum
+ else
+ {
+ HANDLE timer;
+ LARGE_INTEGER sleeptime;
+
+ // takes 100ns units, negative indicates relative time
+ sleeptime.QuadPart = -((int64_t)nsec / 100);
+ timer = CreateWaitableTimer(NULL, true, NULL);
+ SetWaitableTimer(timer, &sleeptime, 0, NULL, NULL, 0);
+ WaitForSingleObject(timer, INFINITE);
+ CloseHandle(timer);
+ }
#elif HAVE_Sleep
else
- Sleep(microseconds / 1000);
+ Sleep(msec);
#else
else
- Sys_SDL_Delay(microseconds / 1000);
+ Sys_SDL_Delay(msec);
#endif
dt = Sys_DirtyTime() - dt;
if(sys_debugsleep.integer)
- Con_Printf(" got %u oversleep %d\n", (unsigned int)(dt * 1000000), (unsigned int)(dt * 1000000) - microseconds);
+ Con_Printf(" got %u oversleep %d\n", (unsigned int)(dt * 1000000), (unsigned int)(dt * 1000000) - usec);
return (dt < 0 || dt >= 1800) ? 0 : dt;
}
#endif
}
-int main (int argc, char **argv)
+/** main() but renamed so we can wrap it in sys_sdl.c and sys_null.c
+ * to avoid needing to include SDL.h in this file (would make the dedicated server require SDL).
+ * SDL builds need SDL.h in the file where main() is defined because SDL renames and wraps main().
+ */
+int Sys_Main(int argc, char *argv[])
{
sys.argc = argc;
sys.argv = (const char **)argv;
Sys_InitSignals();
+#ifdef WIN32
+ Sys_SetTimerResolution();
+#endif
+
Host_Main();
#ifdef __ANDROID__
projects / xonotic / darkplaces.git / blobdiff