Mercurial > sdl-ios-xcode

annotate src/thread/beos/SDL_syssem.c @ 2349:0381047f2210 gsoc2008_iphone

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The class SDL_uikitappdelegate acts as the UIApplicationDelegate for an iPhone SDL project. This class is reponsible for application control flow, including initial setup of working directory, forwarding command line arguments to the user's main function, and handling application termination.
author Holmes Futrell <hfutrell@umail.ucsb.edu>
date Thu, 17 Jul 2008 22:29:37 +0000
parents c121d94672cb
children 99210400e8b9
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: */