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- Lets try using semaphores on Linux instead of sleeping to implement cl_capfps.

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SVN r3270 (trunk)
This commit is contained in:
Braden Obrzut 2011-07-11 02:35:33 +00:00
parent d8ea5cdad9
commit dc50487432
2 changed files with 13 additions and 49 deletions
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7
src/CMakeLists.txt
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@ -444,13 +444,6 @@ if( NOT STRNICMP_EXISTS )
add_definitions( -Dstrnicmp=strncasecmp )
endif( NOT STRNICMP_EXISTS )
if( NOT WIN32 )
CHECK_FUNCTION_EXISTS( sigtimedwait SIGTIMEDWAIT_EXISTS )
if( SIGTIMEDWAIT_EXISTS )
add_definitions( -DHAVE_SIGTIMEDWAIT )
endif( SIGTIMEDWAIT_EXISTS )
endif( NOT WIN32)
if( NOT MSVC )
add_definitions( -D__forceinline=inline )
endif( NOT MSVC )

55
src/sdl/i_system.cpp
View file

@ -33,6 +33,7 @@
#include <sys/stat.h>
#include <fcntl.h>
#include <signal.h>
#include <semaphore.h>
#ifndef NO_GTK
#include <gtk/gtk.h>
#include <gdk/gdkkeysyms.h>
@ -124,10 +125,7 @@ static DWORD BaseTime;
static int TicFrozen;
// Signal based timer.
static struct timespec SignalTimeOut = { 0, 1000000/TICRATE };
#ifdef HAVE_SIGTIMEDWAIT
static sigset_t SignalWaitSet;
#endif
static sem_t timerWait;
static int tics;
static DWORD sig_start, sig_next;
@ -175,11 +173,6 @@ int I_GetTimePolled (bool saveMS)
int I_GetTimeSignaled (bool saveMS)
{
if (TicFrozen != 0)
{
return TicFrozen;
}
if (saveMS)
{
TicStart = sig_start;
@ -203,15 +196,10 @@ int I_WaitForTicSignaled (int prevtic)
{
assert (TicFrozen == 0);
#ifdef HAVE_SIGTIMEDWAIT
while(sigtimedwait(&SignalWaitSet, NULL, &SignalTimeOut) == -1 && errno == EINTR)
;
#else
while(nanosleep(&SignalTimeOut, NULL) == -1 && errno == EINTR)
;
#endif
while(tics <= prevtic)
while(sem_wait(&timerWait) != 0);
return I_GetTimePolled(false);
return tics;
}
void I_FreezeTimeSelect (bool frozen)
@ -258,6 +246,7 @@ void I_HandleAlarm (int sig)
tics++;
sig_start = SDL_GetTicks();
sig_next = Scale((Scale (sig_start, TICRATE, 1000) + 1), 1000, TICRATE);
sem_post(&timerWait);
}
//
@ -267,41 +256,23 @@ void I_HandleAlarm (int sig)
//
void I_SelectTimer()
{
struct sigaction act;
sem_init(&timerWait, 0, 0);
signal(SIGALRM, I_HandleAlarm);
struct itimerval itv;
sigfillset (&act.sa_mask);
act.sa_flags = 0;
// [BL] This doesn't seem to be executed consistantly, I'm guessing the
// sleep functions are taking over the signal. So for now, lets just
// attach WaitForTic to signals in order to reduce CPU usage.
//act.sa_handler = I_HandleAlarm;
act.sa_handler = SIG_IGN;
sigaction (SIGALRM, &act, NULL);
itv.it_interval.tv_sec = itv.it_value.tv_sec = 0;
itv.it_interval.tv_usec = itv.it_value.tv_usec = 1000000/TICRATE;
// [BL] See above.
I_GetTime = I_GetTimePolled;
I_FreezeTime = I_FreezeTimePolled;
if (setitimer(ITIMER_REAL, &itv, NULL) != 0)
{
//I_GetTime = I_GetTimePolled;
//I_FreezeTime = I_FreezeTimePolled;
I_GetTime = I_GetTimePolled;
I_FreezeTime = I_FreezeTimePolled;
I_WaitForTic = I_WaitForTicPolled;
}
else
{
#ifdef HAVE_SIGTIMEDWAIT
sigemptyset(&SignalWaitSet);
sigaddset(&SignalWaitSet, SIGALRM);
#endif
//I_GetTime = I_GetTimeSignaled;
//I_FreezeTime = I_FreezeTimeSignaled;
I_GetTime = I_GetTimeSignaled;
I_FreezeTime = I_FreezeTimeSignaled;
I_WaitForTic = I_WaitForTicSignaled;
}
}