Mercurial > sdl-ios-xcode
annotate src/timer/unix/SDL_systimer.c @ 5113:481dabb098ef
Improved timer implementation
The new timer model is formalized as using a separate thread to handle timer callbacks. This was the case on almost every platform before, but it's now a requirement, and simplifies the implementation and makes it perform consistently across platforms.
Goals:
* Minimize timer thread blocking
* Dispatch timers as accurately as possible
* SDL_AddTimer() and SDL_RemoveTimer() are completely threadsafe
* SDL_RemoveTimer() doesn't crash with a timer that's expired or removed
author | Sam Lantinga <slouken@libsdl.org> |
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date | Thu, 27 Jan 2011 14:45:06 -0800 |
parents | 54cbc34229f4 |
children | b530ef003506 |
rev | line source |
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1 /* |
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2 SDL - Simple DirectMedia Layer |
3697 | 3 Copyright (C) 1997-2010 Sam Lantinga |
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4 |
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5 This library is free software; you can redistribute it and/or |
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6 modify it under the terms of the GNU Lesser General Public |
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7 License as published by the Free Software Foundation; either |
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8 version 2.1 of the License, or (at your option) any later version. |
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9 |
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10 This library is distributed in the hope that it will be useful, |
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 Lesser General Public License for more details. |
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14 |
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15 You should have received a copy of the GNU Lesser General Public |
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16 License along with this library; if not, write to the Free Software |
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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18 |
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19 Sam Lantinga |
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20 slouken@libsdl.org |
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21 */ |
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22 #include "SDL_config.h" |
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23 |
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24 #ifdef SDL_TIMER_UNIX |
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25 |
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26 #include <stdio.h> |
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27 #include <sys/time.h> |
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28 #include <unistd.h> |
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29 #include <errno.h> |
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30 |
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31 #include "SDL_timer.h" |
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32 |
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33 /* The clock_gettime provides monotonous time, so we should use it if |
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34 it's available. The clock_gettime function is behind ifdef |
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35 for __USE_POSIX199309 |
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36 Tommi Kyntola (tommi.kyntola@ray.fi) 27/09/2005 |
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37 */ |
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38 #if HAVE_NANOSLEEP || HAVE_CLOCK_GETTIME |
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39 #include <time.h> |
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40 #endif |
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41 |
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42 /* The first ticks value of the application */ |
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43 #ifdef HAVE_CLOCK_GETTIME |
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44 static struct timespec start; |
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45 #else |
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46 static struct timeval start; |
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47 #endif /* HAVE_CLOCK_GETTIME */ |
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48 |
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49 |
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50 void |
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51 SDL_StartTicks(void) |
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52 { |
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53 /* Set first ticks value */ |
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54 #if HAVE_CLOCK_GETTIME |
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55 clock_gettime(CLOCK_MONOTONIC, &start); |
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56 #else |
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57 gettimeofday(&start, NULL); |
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58 #endif |
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59 } |
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60 |
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61 Uint32 |
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62 SDL_GetTicks(void) |
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63 { |
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64 #if HAVE_CLOCK_GETTIME |
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65 Uint32 ticks; |
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66 struct timespec now; |
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67 clock_gettime(CLOCK_MONOTONIC, &now); |
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68 ticks = |
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69 (now.tv_sec - start.tv_sec) * 1000 + (now.tv_nsec - |
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70 start.tv_nsec) / 1000000; |
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71 return (ticks); |
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72 #else |
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73 Uint32 ticks; |
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74 struct timeval now; |
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75 gettimeofday(&now, NULL); |
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76 ticks = |
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77 (now.tv_sec - start.tv_sec) * 1000 + (now.tv_usec - |
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78 start.tv_usec) / 1000; |
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79 return (ticks); |
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80 #endif |
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81 } |
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82 |
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83 void |
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84 SDL_Delay(Uint32 ms) |
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85 { |
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86 int was_error; |
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87 |
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88 #if HAVE_NANOSLEEP |
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89 struct timespec elapsed, tv; |
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90 #else |
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91 struct timeval tv; |
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92 Uint32 then, now, elapsed; |
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93 #endif |
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94 |
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95 /* Set the timeout interval */ |
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96 #if HAVE_NANOSLEEP |
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97 elapsed.tv_sec = ms / 1000; |
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98 elapsed.tv_nsec = (ms % 1000) * 1000000; |
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99 #else |
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100 then = SDL_GetTicks(); |
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101 #endif |
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102 do { |
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103 errno = 0; |
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104 |
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105 #if HAVE_NANOSLEEP |
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106 tv.tv_sec = elapsed.tv_sec; |
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107 tv.tv_nsec = elapsed.tv_nsec; |
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108 was_error = nanosleep(&tv, &elapsed); |
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109 #else |
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110 /* Calculate the time interval left (in case of interrupt) */ |
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111 now = SDL_GetTicks(); |
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112 elapsed = (now - then); |
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113 then = now; |
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114 if (elapsed >= ms) { |
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115 break; |
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116 } |
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117 ms -= elapsed; |
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118 tv.tv_sec = ms / 1000; |
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119 tv.tv_usec = (ms % 1000) * 1000; |
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120 |
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121 was_error = select(0, NULL, NULL, NULL, &tv); |
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122 #endif /* HAVE_NANOSLEEP */ |
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123 } while (was_error && (errno == EINTR)); |
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124 } |
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125 |
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126 #endif /* SDL_TIMER_UNIX */ |
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127 |
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128 /* vi: set ts=4 sw=4 expandtab: */ |