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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#ifdef SDL_TIMER_OS2
#define INCL_DOSMISC
#define INCL_DOSERRORS
#define INCL_DOSSEMAPHORES
#define INCL_DOSDATETIME
#define INCL_DOSPROCESS
#define INCL_DOSPROFILE
#define INCL_DOSEXCEPTIONS
#include <os2.h>
#include "SDL_thread.h"
#include "SDL_timer.h"
#include "../SDL_timer_c.h"
#define TIME_WRAP_VALUE (~(DWORD)0)
/* The first high-resolution ticks value of the application */
static long long hires_start_ticks;
/* The number of ticks per second of the high-resolution performance counter */
static ULONG hires_ticks_per_second;
void SDL_StartTicks(void)
{
DosTmrQueryFreq(&hires_ticks_per_second);
DosTmrQueryTime((PQWORD)&hires_start_ticks);
}
DECLSPEC Uint32 SDLCALL SDL_GetTicks(void)
{
long long hires_now;
ULONG ticks = ticks;
DosTmrQueryTime((PQWORD)&hires_now);
/*
hires_now -= hires_start_ticks;
hires_now *= 1000;
hires_now /= hires_ticks_per_second;
*/
/* inline asm to avoid runtime inclusion */
_asm {
push edx
push eax
mov eax, dword ptr hires_now
mov edx, dword ptr hires_now+4
sub eax, dword ptr hires_start_ticks
sbb edx, dword ptr hires_start_ticks+4
mov ebx,1000
mov ecx,edx
mul ebx
push eax
push edx
mov eax,ecx
mul ebx
pop eax
add edx,eax
pop eax
mov ebx, dword ptr hires_ticks_per_second
div ebx
mov dword ptr ticks, eax
pop edx
pop eax
}
return ticks;
}
/* High resolution sleep, originally made by Ilya Zakharevich */
DECLSPEC void SDLCALL SDL_Delay(Uint32 ms)
{
/* This is similar to DosSleep(), but has 8ms granularity in time-critical
threads even on Warp3. */
HEV hevEvent1 = 0; /* Event semaphore handle */
HTIMER htimerEvent1 = 0; /* Timer handle */
APIRET rc = NO_ERROR; /* Return code */
int ret = 1;
ULONG priority = 0, nesting; /* Shut down the warnings */
PPIB pib;
PTIB tib;
char *e = NULL;
APIRET badrc;
int switch_priority = 50;
DosCreateEventSem(NULL, /* Unnamed */
&hevEvent1, /* Handle of semaphore returned */
DC_SEM_SHARED, /* Shared needed for DosAsyncTimer */
FALSE); /* Semaphore is in RESET state */
if (ms >= switch_priority)
switch_priority = 0;
if (switch_priority)
{
if (DosGetInfoBlocks(&tib, &pib)!=NO_ERROR)
switch_priority = 0;
else
{
/* In Warp3, to switch scheduling to 8ms step, one needs to do
DosAsyncTimer() in time-critical thread. On laters versions,
more and more cases of wait-for-something are covered.
It turns out that on Warp3fp42 it is the priority at the time
of DosAsyncTimer() which matters. Let's hope that this works
with later versions too... XXXX
*/
priority = (tib->tib_ptib2->tib2_ulpri);
if ((priority & 0xFF00) == 0x0300) /* already time-critical */
switch_priority = 0;
/* Make us time-critical. Just modifying TIB is not enough... */
/* tib->tib_ptib2->tib2_ulpri = 0x0300;*/
/* We do not want to run at high priority if a signal causes us
to longjmp() out of this section... */
if (DosEnterMustComplete(&nesting))
switch_priority = 0;
else
DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0);
}
}
if ((badrc = DosAsyncTimer(ms,
(HSEM) hevEvent1, /* Semaphore to post */
&htimerEvent1))) /* Timer handler (returned) */
e = "DosAsyncTimer";
if (switch_priority && tib->tib_ptib2->tib2_ulpri == 0x0300)
{
/* Nobody switched priority while we slept... Ignore errors... */
/* tib->tib_ptib2->tib2_ulpri = priority; */ /* Get back... */
if (!(rc = DosSetPriority(PRTYS_THREAD, (priority>>8) & 0xFF, 0, 0)))
rc = DosSetPriority(PRTYS_THREAD, 0, priority & 0xFF, 0);
}
if (switch_priority)
rc = DosExitMustComplete(&nesting); /* Ignore errors */
/* The actual blocking call is made with "normal" priority. This way we
should not bother with DosSleep(0) etc. to compensate for us interrupting
higher-priority threads. The goal is to prohibit the system spending too
much time halt()ing, not to run us "no matter what". */
if (!e) /* Wait for AsyncTimer event */
badrc = DosWaitEventSem(hevEvent1, SEM_INDEFINITE_WAIT);
if (e) ; /* Do nothing */
else if (badrc == ERROR_INTERRUPT)
ret = 0;
else if (badrc)
e = "DosWaitEventSem";
if ((rc = DosCloseEventSem(hevEvent1)) && !e) { /* Get rid of semaphore */
e = "DosCloseEventSem";
badrc = rc;
}
if (e)
{
SDL_SetError("[SDL_Delay] : Had error in %s(), rc is 0x%x\n", e, badrc);
}
}
/* Data to handle a single periodic alarm */
static int timer_alive = 0;
static SDL_Thread *timer = NULL;
static int SDLCALL RunTimer(void *unused)
{
DosSetPriority(PRTYS_THREAD, PRTYC_TIMECRITICAL, 0, 0);
while ( timer_alive ) {
if ( SDL_timer_running ) {
SDL_ThreadedTimerCheck();
}
SDL_Delay(10);
}
return(0);
}
/* This is only called if the event thread is not running */
int SDL_SYS_TimerInit(void)
{
timer_alive = 1;
timer = SDL_CreateThread(RunTimer, NULL);
if ( timer == NULL )
return(-1);
return(SDL_SetTimerThreaded(1));
}
void SDL_SYS_TimerQuit(void)
{
timer_alive = 0;
if ( timer ) {
SDL_WaitThread(timer, NULL);
timer = NULL;
}
}
int SDL_SYS_StartTimer(void)
{
SDL_SetError("Internal logic error: OS/2 uses threaded timer");
return(-1);
}
void SDL_SYS_StopTimer(void)
{
return;
}
#endif /* SDL_TIMER_OS2 */
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