| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997-2012 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_RISCOS |
| |
| #include <stdio.h> |
| #include <time.h> |
| #include <sys/time.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <errno.h> |
| |
| #include "SDL_timer.h" |
| #include "../SDL_timer_c.h" |
| |
| #if SDL_THREADS_DISABLED |
| /* Timer SDL_arraysize(Timer ),start/reset time */ |
| static Uint32 timerStart; |
| /* Timer running function */ |
| void RISCOS_CheckTimer(); |
| #else |
| #include <pthread.h> |
| extern Uint32 riscos_main_thread; |
| extern int riscos_using_threads; |
| extern Uint32 SDL_ThreadID(); |
| extern Uint32 SDL_EventThreadID(void); |
| #endif |
| |
| |
| extern void RISCOS_BackgroundTasks(void); |
| |
| /* The first ticks value of the application */ |
| clock_t start; |
| |
| void SDL_StartTicks(void) |
| { |
| /* Set first ticks value */ |
| start = clock(); |
| } |
| |
| Uint32 SDL_GetTicks (void) |
| { |
| clock_t ticks; |
| |
| ticks=clock()-start; |
| |
| |
| #if CLOCKS_PER_SEC == 1000 |
| |
| return(ticks); |
| |
| #elif CLOCKS_PER_SEC == 100 |
| |
| return (ticks * 10); |
| |
| #else |
| |
| return ticks*(1000/CLOCKS_PER_SEC); |
| |
| #endif |
| |
| } |
| |
| void SDL_Delay (Uint32 ms) |
| { |
| Uint32 now,then,elapsed; |
| #if !SDL_THREADS_DISABLED |
| int is_event_thread; |
| if (riscos_using_threads) |
| { |
| is_event_thread = 0; |
| if (SDL_EventThreadID()) |
| { |
| if (SDL_EventThreadID() == SDL_ThreadID()) is_event_thread = 1; |
| } else if (SDL_ThreadID() == riscos_main_thread) is_event_thread = 1; |
| } else is_event_thread = 1; |
| #endif |
| |
| /*TODO: Next version of Unixlib may allow us to use usleep here */ |
| /* for non event threads */ |
| |
| /* Set the timeout interval - Linux only needs to do this once */ |
| then = SDL_GetTicks(); |
| |
| do { |
| /* Do background tasks required while sleeping as we are not multithreaded */ |
| #if SDL_THREADS_DISABLED |
| RISCOS_BackgroundTasks(); |
| #else |
| /* For threaded build only run background tasks in event thread */ |
| if (is_event_thread) RISCOS_BackgroundTasks(); |
| #endif |
| |
| /* Calculate the time interval left (in case of interrupt) */ |
| now = SDL_GetTicks(); |
| elapsed = (now-then); |
| then = now; |
| if ( elapsed >= ms ) { |
| break; |
| } |
| ms -= elapsed; |
| #if !SDL_THREADS_DISABLED |
| /* Need to yield to let other threads have a go */ |
| if (riscos_using_threads) pthread_yield(); |
| #endif |
| |
| } while ( 1 ); |
| } |
| |
| #if SDL_THREADS_DISABLED |
| |
| /* Non-threaded version of timer */ |
| |
| int SDL_SYS_TimerInit(void) |
| { |
| return(0); |
| } |
| |
| void SDL_SYS_TimerQuit(void) |
| { |
| SDL_SetTimer(0, NULL); |
| } |
| |
| int SDL_SYS_StartTimer(void) |
| { |
| timerStart = SDL_GetTicks(); |
| |
| return(0); |
| } |
| |
| void SDL_SYS_StopTimer(void) |
| { |
| /* Don't need to do anything as we use SDL_timer_running |
| to detect if we need to check the timer */ |
| } |
| |
| |
| void RISCOS_CheckTimer() |
| { |
| if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval) |
| { |
| Uint32 ms; |
| |
| ms = SDL_alarm_callback(SDL_alarm_interval); |
| if ( ms != SDL_alarm_interval ) |
| { |
| if ( ms ) |
| { |
| SDL_alarm_interval = ROUND_RESOLUTION(ms); |
| } else |
| { |
| SDL_alarm_interval = 0; |
| SDL_timer_running = 0; |
| } |
| } |
| if (SDL_alarm_interval) timerStart = SDL_GetTicks(); |
| } |
| } |
| |
| #else |
| |
| /* Threaded version of timer - based on code for linux */ |
| |
| #include "SDL_thread.h" |
| |
| /* Data to handle a single periodic alarm */ |
| static int timer_alive = 0; |
| static SDL_Thread *timer = NULL; |
| |
| static int RunTimer(void *unused) |
| { |
| while ( timer_alive ) { |
| if ( SDL_timer_running ) { |
| SDL_ThreadedTimerCheck(); |
| } |
| SDL_Delay(1); |
| } |
| 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: RISC OS uses threaded timer"); |
| return(-1); |
| } |
| |
| void SDL_SYS_StopTimer(void) |
| { |
| return; |
| } |
| |
| #endif /* SDL_THREADS_DISABLED */ |
| |
| #endif /* SDL_TIMER_RISCOS */ |