annotate src/thread/amigaos/SDL_syssem.c @ 769:b8d311d90021

Updated copyright information for 2004 (Happy New Year!)
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2004 16:49:27 +0000
parents f6ffac90895c
children c9b51268668f
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 /* An implementation of semaphores using mutexes and condition variables */
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29
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30 #include "SDL_error.h"
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31 #include "SDL_thread.h"
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32 #include "SDL_systhread_c.h"
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33
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34
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35 struct SDL_semaphore
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36 {
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37 struct SignalSemaphore Sem;
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38 Uint32 count;
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39 Uint32 waiters_count;
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40 SDL_mutex *count_lock;
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41 SDL_cond *count_nonzero;
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42 };
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43
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44 #undef D
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45
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46 #define D(x)
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47
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48 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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49 {
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50 SDL_sem *sem;
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51
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52 sem = (SDL_sem *)malloc(sizeof(*sem));
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53
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54 if ( ! sem ) {
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55 SDL_OutOfMemory();
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56 return(0);
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57 }
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58
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59 D(bug("Creating semaphore %lx...\n",sem));
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60
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61 memset(sem,0,sizeof(*sem));
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62
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63 InitSemaphore(&sem->Sem);
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64
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65 return(sem);
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66 }
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67
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68 void SDL_DestroySemaphore(SDL_sem *sem)
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69 {
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70 D(bug("Destroying semaphore %lx...\n",sem));
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71
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72 if ( sem ) {
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73 // Condizioni per liberare i task in attesa?
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74 free(sem);
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75 }
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76 }
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77
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78 int SDL_SemTryWait(SDL_sem *sem)
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79 {
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80 if ( ! sem ) {
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81 SDL_SetError("Passed a NULL semaphore");
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82 return -1;
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83 }
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84
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85 D(bug("TryWait semaphore...%lx\n",sem));
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86
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87 ObtainSemaphore(&sem->Sem);
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88 // ReleaseSemaphore(&sem->Sem);
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89
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90 return 1;
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91 }
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92
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93 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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94 {
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95 int retval;
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96
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97
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98 if ( ! sem ) {
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99 SDL_SetError("Passed a NULL semaphore");
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100 return -1;
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101 }
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102
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103 D(bug("WaitTimeout (%ld) semaphore...%lx\n",timeout,sem));
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104
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105 /* A timeout of 0 is an easy case */
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106 if ( timeout == 0 ) {
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107 return SDL_SemTryWait(sem);
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108 }
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109 /*
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110 SDL_LockMutex(sem->count_lock);
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111 ++sem->waiters_count;
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112 retval = 0;
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113 while ( (sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT) ) {
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114 retval = SDL_CondWaitTimeout(sem->count_nonzero,
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115 sem->count_lock, timeout);
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116 }
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117 --sem->waiters_count;
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118 --sem->count;
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119 SDL_UnlockMutex(sem->count_lock);
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120 */
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121 if(!(retval=AttemptSemaphore(&sem->Sem)))
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122 {
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123 SDL_Delay(timeout);
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124 retval=AttemptSemaphore(&sem->Sem);
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125 }
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126
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127 if(retval==TRUE)
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128 {
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129 // ReleaseSemaphore(&sem->Sem);
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130 retval=1;
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131 }
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132
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133 return retval;
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134 }
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135
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136 int SDL_SemWait(SDL_sem *sem)
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137 {
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138 ObtainSemaphore(&sem->Sem);
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139 return 0;
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140 // return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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141 }
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142
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143 Uint32 SDL_SemValue(SDL_sem *sem)
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144 {
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145 Uint32 value;
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146
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147 value = 0;
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148 if ( sem ) {
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149 #ifdef STORMC4_WOS
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150 value = sem->Sem.ssppc_SS.ss_NestCount;
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151 #else
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152 value = sem->Sem.ss_NestCount;
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153 #endif
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154 // SDL_UnlockMutex(sem->count_lock);
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155 }
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156 return value;
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157 }
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158
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159 int SDL_SemPost(SDL_sem *sem)
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160 {
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161 if ( ! sem ) {
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162 SDL_SetError("Passed a NULL semaphore");
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163 return -1;
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164 }
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165 D(bug("SemPost semaphore...%lx\n",sem));
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166
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167 ReleaseSemaphore(&sem->Sem);
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168 #if 0
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169 SDL_LockMutex(sem->count_lock);
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170 if ( sem->waiters_count > 0 ) {
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171 SDL_CondSignal(sem->count_nonzero);
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172 }
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173 ++sem->count;
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174 SDL_UnlockMutex(sem->count_lock);
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175 #endif
0
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176 return 0;
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177 }
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178