Mercurial > sdl-ios-xcode

annotate src/thread/beos/SDL_syssem.c @ 1675:d33dcfc3fde7 SDL-1.3

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Overlay functions are being replaced by YUV textures. If the driver doesn't support YUV textures, they can be emulated by backing the texture with an RGB texture and using the software conversion routines. Note that it doesn't make sense to lock a portion of a YV12 texture, since you'd need to return three pixel pointers and pitch values instead of the one that's available through the API. I'm guessing that's one of the reasons DirectX 9 doesn't support this format at all.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 11 Jun 2006 07:30:16 +0000
parents 4da1ee79c9af
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 /* Semaphores in the BeOS environment */
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25
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26 #include <be/kernel/OS.h>
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27
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28 #include "SDL_thread.h"
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29
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30
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31 struct SDL_semaphore
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32 {
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33 sem_id id;
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34 };
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35
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36 /* Create a counting semaphore */
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37 SDL_sem *
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38 SDL_CreateSemaphore(Uint32 initial_value)
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39 {
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40 SDL_sem *sem;
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41
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42 sem = (SDL_sem *) SDL_malloc(sizeof(*sem));
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43 if (sem) {
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44 sem->id = create_sem(initial_value, "SDL semaphore");
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45 if (sem->id < B_NO_ERROR) {
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46 SDL_SetError("create_sem() failed");
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47 SDL_free(sem);
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48 sem = NULL;
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49 }
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50 } else {
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51 SDL_OutOfMemory();
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52 }
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53 return (sem);
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54 }
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55
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56 /* Free the semaphore */
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57 void
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58 SDL_DestroySemaphore(SDL_sem * sem)
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59 {
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60 if (sem) {
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61 if (sem->id >= B_NO_ERROR) {
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62 delete_sem(sem->id);
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63 }
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64 SDL_free(sem);
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65 }
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66 }
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67
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68 int
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69 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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70 {
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71 int32 val;
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72 int retval;
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73
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74 if (!sem) {
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75 SDL_SetError("Passed a NULL semaphore");
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76 return -1;
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77 }
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78
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79 tryagain:
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80 if (timeout == SDL_MUTEX_MAXWAIT) {
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81 val = acquire_sem(sem->id);
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82 } else {
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83 timeout *= 1000; /* BeOS uses a timeout in microseconds */
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84 val = acquire_sem_etc(sem->id, 1, B_RELATIVE_TIMEOUT, timeout);
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85 }
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86 switch (val) {
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87 case B_INTERRUPTED:
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88 goto tryagain;
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89 case B_NO_ERROR:
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90 retval = 0;
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91 break;
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92 case B_TIMED_OUT:
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93 retval = SDL_MUTEX_TIMEDOUT;
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94 break;
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95 case B_WOULD_BLOCK:
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96 retval = SDL_MUTEX_TIMEDOUT;
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97 break;
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98 default:
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99 SDL_SetError("acquire_sem() failed");
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100 retval = -1;
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101 break;
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102 }
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103
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104 return retval;
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105 }
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106
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107 int
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108 SDL_SemTryWait(SDL_sem * sem)
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109 {
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110 return SDL_SemWaitTimeout(sem, 0);
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111 }
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112
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113 int
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114 SDL_SemWait(SDL_sem * sem)
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115 {
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116 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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117 }
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118
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119 /* Returns the current count of the semaphore */
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120 Uint32
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121 SDL_SemValue(SDL_sem * sem)
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122 {
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123 int32 count;
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124 Uint32 value;
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125
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126 value = 0;
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127 if (sem) {
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128 get_sem_count(sem->id, &count);
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129 if (count > 0) {
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130 value = (Uint32) count;
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131 }
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132 }
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133 return value;
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134 }
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135
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136 /* Atomically increases the semaphore's count (not blocking) */
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137 int
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138 SDL_SemPost(SDL_sem * sem)
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139 {
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140 if (!sem) {
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141 SDL_SetError("Passed a NULL semaphore");
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142 return -1;
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143 }
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144
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145 if (release_sem(sem->id) != B_NO_ERROR) {
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146 SDL_SetError("release_sem() failed");
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147 return -1;
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148 }
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149 return 0;
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150 }
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151
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152 /* vi: set ts=4 sw=4 expandtab: */