annotate src/thread/beos/SDL_syssem.c @ 1336:3692456e7b0f

Use SDL_ prefixed versions of C library functions. FIXME: Change #include <stdlib.h> to #include "SDL_stdlib.h" Change #include <string.h> to #include "SDL_string.h" Make sure nothing else broke because of this...
author Sam Lantinga <slouken@libsdl.org>
date Tue, 07 Feb 2006 06:59:48 +0000
parents c9b51268668f
children c71e05b4dc2e
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
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23 /* Semaphores in the BeOS environment */
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24
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25 #include <be/kernel/OS.h>
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26
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27 #include "SDL_error.h"
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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 sem_id id;
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33 };
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34
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35 /* Create a counting semaphore */
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36 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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37 {
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38 SDL_sem *sem;
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39
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40 sem = (SDL_sem *)SDL_malloc(sizeof(*sem));
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41 if ( sem ) {
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42 sem->id = create_sem(initial_value, "SDL semaphore");
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43 if ( sem->id < B_NO_ERROR ) {
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44 SDL_SetError("create_sem() failed");
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45 SDL_free(sem);
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46 sem = NULL;
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47 }
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48 } else {
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49 SDL_OutOfMemory();
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50 }
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51 return(sem);
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52 }
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53
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54 /* Free the semaphore */
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55 void SDL_DestroySemaphore(SDL_sem *sem)
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56 {
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57 if ( sem ) {
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58 if ( sem->id >= B_NO_ERROR ) {
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59 delete_sem(sem->id);
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60 }
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61 SDL_free(sem);
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62 }
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63 }
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64
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65 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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66 {
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67 int32 val;
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68 int retval;
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69
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70 if ( ! sem ) {
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71 SDL_SetError("Passed a NULL semaphore");
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72 return -1;
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73 }
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74
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75 tryagain:
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76 if ( timeout == SDL_MUTEX_MAXWAIT ) {
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77 val = acquire_sem(sem->id);
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78 } else {
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79 timeout *= 1000; /* BeOS uses a timeout in microseconds */
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80 val = acquire_sem_etc(sem->id, 1, B_RELATIVE_TIMEOUT, timeout);
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81 }
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82 switch (val) {
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83 case B_INTERRUPTED:
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84 goto tryagain;
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85 case B_NO_ERROR:
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86 retval = 0;
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87 break;
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88 case B_TIMED_OUT:
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89 retval = SDL_MUTEX_TIMEDOUT;
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90 break;
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91 case B_WOULD_BLOCK:
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92 retval = SDL_MUTEX_TIMEDOUT;
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93 break;
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94 default:
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95 SDL_SetError("acquire_sem() failed");
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96 retval = -1;
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97 break;
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98 }
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99
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100 return retval;
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101 }
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102
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103 int SDL_SemTryWait(SDL_sem *sem)
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104 {
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105 return SDL_SemWaitTimeout(sem, 0);
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106 }
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107
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108 int SDL_SemWait(SDL_sem *sem)
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109 {
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110 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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111 }
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112
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113 /* Returns the current count of the semaphore */
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114 Uint32 SDL_SemValue(SDL_sem *sem)
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115 {
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116 int32 count;
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117 Uint32 value;
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118
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119 value = 0;
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120 if ( sem ) {
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121 get_sem_count(sem->id, &count);
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122 if ( count > 0 ) {
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123 value = (Uint32)count;
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124 }
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125 }
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126 return value;
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127 }
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128
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129 /* Atomically increases the semaphore's count (not blocking) */
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130 int SDL_SemPost(SDL_sem *sem)
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131 {
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132 if ( ! sem ) {
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133 SDL_SetError("Passed a NULL semaphore");
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134 return -1;
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135 }
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136
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137 if ( release_sem(sem->id) != B_NO_ERROR ) {
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138 SDL_SetError("release_sem() failed");
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139 return -1;
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140 }
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141 return 0;
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142 }