Mercurial > sdl-ios-xcode
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 |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 4 |
| 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 |
| 0 | 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. |
| 0 | 9 |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
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13 Lesser General Public License for more details. |
| 0 | 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 |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
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23 /* An implementation of semaphores using mutexes and condition variables */ |
| 0 | 24 |
| 25 #include "SDL_error.h" | |
| 26 #include "SDL_thread.h" | |
| 27 #include "SDL_systhread_c.h" | |
| 28 | |
| 29 | |
| 30 struct SDL_semaphore | |
| 31 { | |
| 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; |
| 0 | 37 }; |
| 38 | |
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39 #undef D |
| 0 | 40 |
| 41 #define D(x) | |
| 42 | |
| 43 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 44 { | |
| 45 SDL_sem *sem; | |
| 46 | |
| 47 sem = (SDL_sem *)malloc(sizeof(*sem)); | |
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48 |
| 0 | 49 if ( ! sem ) { |
| 50 SDL_OutOfMemory(); | |
| 51 return(0); | |
| 52 } | |
| 53 | |
| 54 D(bug("Creating semaphore %lx...\n",sem)); | |
| 55 | |
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56 memset(sem,0,sizeof(*sem)); |
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57 |
| 0 | 58 InitSemaphore(&sem->Sem); |
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59 |
| 0 | 60 return(sem); |
| 61 } | |
| 62 | |
| 63 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 64 { | |
| 65 D(bug("Destroying semaphore %lx...\n",sem)); | |
| 66 | |
| 67 if ( sem ) { | |
| 68 // Condizioni per liberare i task in attesa? | |
| 69 free(sem); | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 int SDL_SemTryWait(SDL_sem *sem) | |
| 74 { | |
| 75 if ( ! sem ) { | |
| 76 SDL_SetError("Passed a NULL semaphore"); | |
| 77 return -1; | |
| 78 } | |
| 79 | |
| 80 D(bug("TryWait semaphore...%lx\n",sem)); | |
| 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; |
| 0 | 86 } |
| 87 | |
| 88 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 89 { | |
| 90 int retval; | |
| 91 | |
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92 |
| 0 | 93 if ( ! sem ) { |
| 94 SDL_SetError("Passed a NULL semaphore"); | |
| 95 return -1; | |
| 96 } | |
| 97 | |
| 98 D(bug("WaitTimeout (%ld) semaphore...%lx\n",timeout,sem)); | |
| 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 */ |
| 0 | 116 if(!(retval=AttemptSemaphore(&sem->Sem))) |
| 117 { | |
| 118 SDL_Delay(timeout); | |
| 119 retval=AttemptSemaphore(&sem->Sem); | |
| 120 } | |
| 121 | |
| 122 if(retval==TRUE) | |
| 123 { | |
| 124 // ReleaseSemaphore(&sem->Sem); | |
| 125 retval=1; | |
| 126 } | |
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127 |
| 0 | 128 return retval; |
| 129 } | |
| 130 | |
| 131 int SDL_SemWait(SDL_sem *sem) | |
| 132 { | |
| 133 ObtainSemaphore(&sem->Sem); | |
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134 return 0; |
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135 // return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); |
| 0 | 136 } |
| 137 | |
| 138 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 139 { | |
| 140 Uint32 value; | |
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141 |
| 0 | 142 value = 0; |
| 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 |
| 0 | 147 value = sem->Sem.ss_NestCount; |
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148 #endif |
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149 // SDL_UnlockMutex(sem->count_lock); |
| 0 | 150 } |
| 151 return value; | |
| 152 } | |
| 153 | |
| 154 int SDL_SemPost(SDL_sem *sem) | |
| 155 { | |
| 156 if ( ! sem ) { | |
| 157 SDL_SetError("Passed a NULL semaphore"); | |
| 158 return -1; | |
| 159 } | |
| 160 D(bug("SemPost semaphore...%lx\n",sem)); | |
| 161 | |
| 162 ReleaseSemaphore(&sem->Sem); | |
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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 | 171 return 0; |
| 172 } | |
| 173 |