Mercurial > sdl-ios-xcode

annotate src/timer/unix/SDL_systimer.c @ 5282:8e421890cdb8

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Fixed bug #1117 There's a new event that's always sent when the window changes size, and that event is what the renderers listen for to determine if they need to rebind their context.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 12 Feb 2011 19:02:14 -0800
parents b530ef003506
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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b530ef003506 Happy 2011! :)
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3 Copyright (C) 1997-2011 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: */