| 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
| 3 | Copyright (C) 1997-2009 Sam Lantinga |
| 4 | |
| 5 | This library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | This library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with this library; if not, write to the Free Software |
| 17 | Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 18 | |
| 19 | Sam Lantinga |
| 20 | slouken@libsdl.org |
| 21 | */ |
| 22 | #include "SDL_config.h" |
| 23 | |
| 24 | #ifdef SDL_TIMER_RISCOS |
| 25 | |
| 26 | #include <stdio.h> |
| 27 | #include <time.h> |
| 28 | #include <sys/time.h> |
| 29 | #include <unistd.h> |
| 30 | #include <string.h> |
| 31 | #include <errno.h> |
| 32 | |
| 33 | #include "SDL_timer.h" |
| 34 | #include "../SDL_timer_c.h" |
| 35 | |
| 36 | #if SDL_THREADS_DISABLED |
| 37 | /* Timer SDL_arraysize(Timer ),start/reset time */ |
| 38 | static Uint32 timerStart; |
| 39 | /* Timer running function */ |
| 40 | void RISCOS_CheckTimer(); |
| 41 | #else |
| 42 | #include <pthread.h> |
| 43 | extern Uint32 riscos_main_thread; |
| 44 | extern int riscos_using_threads; |
| 45 | extern Uint32 SDL_ThreadID(); |
| 46 | extern Uint32 SDL_EventThreadID(void); |
| 47 | #endif |
| 48 | |
| 49 | |
| 50 | extern void RISCOS_BackgroundTasks(void); |
| 51 | |
| 52 | /* The first ticks value of the application */ |
| 53 | clock_t start; |
| 54 | |
| 55 | void SDL_StartTicks(void) |
| 56 | { |
| 57 | /* Set first ticks value */ |
| 58 | start = clock(); |
| 59 | } |
| 60 | |
| 61 | Uint32 SDL_GetTicks (void) |
| 62 | { |
| 63 | clock_t ticks; |
| 64 | |
| 65 | ticks=clock()-start; |
| 66 | |
| 67 | |
| 68 | #if CLOCKS_PER_SEC == 1000 |
| 69 | |
| 70 | return(ticks); |
| 71 | |
| 72 | #elif CLOCKS_PER_SEC == 100 |
| 73 | |
| 74 | return (ticks * 10); |
| 75 | |
| 76 | #else |
| 77 | |
| 78 | return ticks*(1000/CLOCKS_PER_SEC); |
| 79 | |
| 80 | #endif |
| 81 | |
| 82 | } |
| 83 | |
| 84 | void SDL_Delay (Uint32 ms) |
| 85 | { |
| 86 | Uint32 now,then,elapsed; |
| 87 | #if !SDL_THREADS_DISABLED |
| 88 | int is_event_thread; |
| 89 | if (riscos_using_threads) |
| 90 | { |
| 91 | is_event_thread = 0; |
| 92 | if (SDL_EventThreadID()) |
| 93 | { |
| 94 | if (SDL_EventThreadID() == SDL_ThreadID()) is_event_thread = 1; |
| 95 | } else if (SDL_ThreadID() == riscos_main_thread) is_event_thread = 1; |
| 96 | } else is_event_thread = 1; |
| 97 | #endif |
| 98 | |
| 99 | /*TODO: Next version of Unixlib may allow us to use usleep here */ |
| 100 | /* for non event threads */ |
| 101 | |
| 102 | /* Set the timeout interval - Linux only needs to do this once */ |
| 103 | then = SDL_GetTicks(); |
| 104 | |
| 105 | do { |
| 106 | /* Do background tasks required while sleeping as we are not multithreaded */ |
| 107 | #if SDL_THREADS_DISABLED |
| 108 | RISCOS_BackgroundTasks(); |
| 109 | #else |
| 110 | /* For threaded build only run background tasks in event thread */ |
| 111 | if (is_event_thread) RISCOS_BackgroundTasks(); |
| 112 | #endif |
| 113 | |
| 114 | /* Calculate the time interval left (in case of interrupt) */ |
| 115 | now = SDL_GetTicks(); |
| 116 | elapsed = (now-then); |
| 117 | then = now; |
| 118 | if ( elapsed >= ms ) { |
| 119 | break; |
| 120 | } |
| 121 | ms -= elapsed; |
| 122 | #if !SDL_THREADS_DISABLED |
| 123 | /* Need to yield to let other threads have a go */ |
| 124 | if (riscos_using_threads) pthread_yield(); |
| 125 | #endif |
| 126 | |
| 127 | } while ( 1 ); |
| 128 | } |
| 129 | |
| 130 | #if SDL_THREADS_DISABLED |
| 131 | |
| 132 | /* Non-threaded version of timer */ |
| 133 | |
| 134 | int SDL_SYS_TimerInit(void) |
| 135 | { |
| 136 | return(0); |
| 137 | } |
| 138 | |
| 139 | void SDL_SYS_TimerQuit(void) |
| 140 | { |
| 141 | SDL_SetTimer(0, NULL); |
| 142 | } |
| 143 | |
| 144 | int SDL_SYS_StartTimer(void) |
| 145 | { |
| 146 | timerStart = SDL_GetTicks(); |
| 147 | |
| 148 | return(0); |
| 149 | } |
| 150 | |
| 151 | void SDL_SYS_StopTimer(void) |
| 152 | { |
| 153 | /* Don't need to do anything as we use SDL_timer_running |
| 154 | to detect if we need to check the timer */ |
| 155 | } |
| 156 | |
| 157 | |
| 158 | void RISCOS_CheckTimer() |
| 159 | { |
| 160 | if (SDL_timer_running && SDL_GetTicks() - timerStart >= SDL_alarm_interval) |
| 161 | { |
| 162 | Uint32 ms; |
| 163 | |
| 164 | ms = SDL_alarm_callback(SDL_alarm_interval); |
| 165 | if ( ms != SDL_alarm_interval ) |
| 166 | { |
| 167 | if ( ms ) |
| 168 | { |
| 169 | SDL_alarm_interval = ROUND_RESOLUTION(ms); |
| 170 | } else |
| 171 | { |
| 172 | SDL_alarm_interval = 0; |
| 173 | SDL_timer_running = 0; |
| 174 | } |
| 175 | } |
| 176 | if (SDL_alarm_interval) timerStart = SDL_GetTicks(); |
| 177 | } |
| 178 | } |
| 179 | |
| 180 | #else |
| 181 | |
| 182 | /* Threaded version of timer - based on code for linux */ |
| 183 | |
| 184 | #include "SDL_thread.h" |
| 185 | |
| 186 | /* Data to handle a single periodic alarm */ |
| 187 | static int timer_alive = 0; |
| 188 | static SDL_Thread *timer = NULL; |
| 189 | |
| 190 | static int RunTimer(void *unused) |
| 191 | { |
| 192 | while ( timer_alive ) { |
| 193 | if ( SDL_timer_running ) { |
| 194 | SDL_ThreadedTimerCheck(); |
| 195 | } |
| 196 | SDL_Delay(1); |
| 197 | } |
| 198 | return(0); |
| 199 | } |
| 200 | |
| 201 | /* This is only called if the event thread is not running */ |
| 202 | int SDL_SYS_TimerInit(void) |
| 203 | { |
| 204 | timer_alive = 1; |
| 205 | timer = SDL_CreateThread(RunTimer, NULL); |
| 206 | if ( timer == NULL ) |
| 207 | return(-1); |
| 208 | return(SDL_SetTimerThreaded(1)); |
| 209 | } |
| 210 | |
| 211 | void SDL_SYS_TimerQuit(void) |
| 212 | { |
| 213 | timer_alive = 0; |
| 214 | if ( timer ) { |
| 215 | SDL_WaitThread(timer, NULL); |
| 216 | timer = NULL; |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | int SDL_SYS_StartTimer(void) |
| 221 | { |
| 222 | SDL_SetError("Internal logic error: RISC OS uses threaded timer"); |
| 223 | return(-1); |
| 224 | } |
| 225 | |
| 226 | void SDL_SYS_StopTimer(void) |
| 227 | { |
| 228 | return; |
| 229 | } |
| 230 | |
| 231 | #endif /* SDL_THREADS_DISABLED */ |
| 232 | |
| 233 | #endif /* SDL_TIMER_RISCOS */ |