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annotate src/timer/unix/SDL_systimer.c @ 5246:189b1bdb7baf

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Surfaces aren't in hardware memory anymore!
author Sam Lantinga <slouken@libsdl.org>
date Thu, 10 Feb 2011 05:10:05 -0800
parents 481dabb098ef
children b530ef003506
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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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: */