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annotate src/thread/beos/SDL_syssem.c @ 4866:f42e8db53f78

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Added a typedef for the thread function to simplify documentation
author Sam Lantinga <slouken@libsdl.org>
date Sat, 28 Aug 2010 22:56:52 -0700
parents f7b03b6838cb
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 /* 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 }
0
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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: */