annotate src/thread/amigaos/SDL_syssem.c @ 1312:c9b51268668f

Updated copyright information and removed rcs id lines (problematic in branch merges) I batch edited these files, so please let me know if I've accidentally removed anybody's credit here.
author Sam Lantinga <slouken@libsdl.org>
date Wed, 01 Feb 2006 06:32:25 +0000
parents b8d311d90021
children 3692456e7b0f
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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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 /* An implementation of semaphores using mutexes and condition variables */
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24
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25 #include "SDL_error.h"
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26 #include "SDL_thread.h"
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27 #include "SDL_systhread_c.h"
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28
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29
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30 struct SDL_semaphore
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31 {
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32 struct SignalSemaphore Sem;
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33 Uint32 count;
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34 Uint32 waiters_count;
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35 SDL_mutex *count_lock;
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36 SDL_cond *count_nonzero;
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37 };
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38
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39 #undef D
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40
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41 #define D(x)
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42
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43 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value)
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44 {
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45 SDL_sem *sem;
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46
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47 sem = (SDL_sem *)malloc(sizeof(*sem));
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48
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49 if ( ! sem ) {
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50 SDL_OutOfMemory();
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51 return(0);
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52 }
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53
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54 D(bug("Creating semaphore %lx...\n",sem));
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55
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56 memset(sem,0,sizeof(*sem));
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57
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58 InitSemaphore(&sem->Sem);
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59
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60 return(sem);
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61 }
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62
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63 void SDL_DestroySemaphore(SDL_sem *sem)
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64 {
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65 D(bug("Destroying semaphore %lx...\n",sem));
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66
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67 if ( sem ) {
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68 // Condizioni per liberare i task in attesa?
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69 free(sem);
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70 }
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71 }
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72
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73 int SDL_SemTryWait(SDL_sem *sem)
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74 {
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75 if ( ! sem ) {
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76 SDL_SetError("Passed a NULL semaphore");
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77 return -1;
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78 }
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79
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80 D(bug("TryWait semaphore...%lx\n",sem));
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81
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82 ObtainSemaphore(&sem->Sem);
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83 // ReleaseSemaphore(&sem->Sem);
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84
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85 return 1;
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86 }
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87
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88 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout)
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89 {
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90 int retval;
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91
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92
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93 if ( ! sem ) {
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94 SDL_SetError("Passed a NULL semaphore");
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95 return -1;
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96 }
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97
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98 D(bug("WaitTimeout (%ld) semaphore...%lx\n",timeout,sem));
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99
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100 /* A timeout of 0 is an easy case */
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101 if ( timeout == 0 ) {
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102 return SDL_SemTryWait(sem);
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103 }
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104 /*
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105 SDL_LockMutex(sem->count_lock);
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106 ++sem->waiters_count;
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107 retval = 0;
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108 while ( (sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT) ) {
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109 retval = SDL_CondWaitTimeout(sem->count_nonzero,
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110 sem->count_lock, timeout);
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111 }
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112 --sem->waiters_count;
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113 --sem->count;
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114 SDL_UnlockMutex(sem->count_lock);
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115 */
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116 if(!(retval=AttemptSemaphore(&sem->Sem)))
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117 {
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118 SDL_Delay(timeout);
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119 retval=AttemptSemaphore(&sem->Sem);
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120 }
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121
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122 if(retval==TRUE)
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123 {
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124 // ReleaseSemaphore(&sem->Sem);
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125 retval=1;
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126 }
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127
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128 return retval;
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129 }
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130
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131 int SDL_SemWait(SDL_sem *sem)
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132 {
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133 ObtainSemaphore(&sem->Sem);
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134 return 0;
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135 // return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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136 }
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137
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138 Uint32 SDL_SemValue(SDL_sem *sem)
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139 {
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140 Uint32 value;
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141
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142 value = 0;
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143 if ( sem ) {
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144 #ifdef STORMC4_WOS
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145 value = sem->Sem.ssppc_SS.ss_NestCount;
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146 #else
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147 value = sem->Sem.ss_NestCount;
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148 #endif
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149 // SDL_UnlockMutex(sem->count_lock);
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150 }
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151 return value;
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152 }
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153
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154 int SDL_SemPost(SDL_sem *sem)
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155 {
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156 if ( ! sem ) {
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157 SDL_SetError("Passed a NULL semaphore");
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158 return -1;
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159 }
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160 D(bug("SemPost semaphore...%lx\n",sem));
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161
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162 ReleaseSemaphore(&sem->Sem);
21
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163 #if 0
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164 SDL_LockMutex(sem->count_lock);
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165 if ( sem->waiters_count > 0 ) {
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166 SDL_CondSignal(sem->count_nonzero);
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167 }
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168 ++sem->count;
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169 SDL_UnlockMutex(sem->count_lock);
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170 #endif
0
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171 return 0;
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172 }
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173