Mercurial > sdl-ios-xcode
annotate src/thread/amigaos/SDL_syssem.c @ 1358:c71e05b4dc2e
More header massaging... works great on Windows. ;-)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Fri, 10 Feb 2006 06:48:43 +0000 |
| parents | 3692456e7b0f |
| children | 19418e4422cb |
| 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_thread.h" | |
| 26 #include "SDL_systhread_c.h" | |
| 27 | |
| 28 | |
| 29 struct SDL_semaphore | |
| 30 { | |
| 31 struct SignalSemaphore Sem; | |
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32 Uint32 count; |
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33 Uint32 waiters_count; |
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34 SDL_mutex *count_lock; |
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35 SDL_cond *count_nonzero; |
| 0 | 36 }; |
| 37 | |
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38 #undef D |
| 0 | 39 |
| 40 #define D(x) | |
| 41 | |
| 42 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 43 { | |
| 44 SDL_sem *sem; | |
| 45 | |
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46 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); |
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47 |
| 0 | 48 if ( ! sem ) { |
| 49 SDL_OutOfMemory(); | |
| 50 return(0); | |
| 51 } | |
| 52 | |
| 53 D(bug("Creating semaphore %lx...\n",sem)); | |
| 54 | |
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55 SDL_memset(sem,0,sizeof(*sem)); |
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56 |
| 0 | 57 InitSemaphore(&sem->Sem); |
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58 |
| 0 | 59 return(sem); |
| 60 } | |
| 61 | |
| 62 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 63 { | |
| 64 D(bug("Destroying semaphore %lx...\n",sem)); | |
| 65 | |
| 66 if ( sem ) { | |
| 67 // Condizioni per liberare i task in attesa? | |
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68 SDL_free(sem); |
| 0 | 69 } |
| 70 } | |
| 71 | |
| 72 int SDL_SemTryWait(SDL_sem *sem) | |
| 73 { | |
| 74 if ( ! sem ) { | |
| 75 SDL_SetError("Passed a NULL semaphore"); | |
| 76 return -1; | |
| 77 } | |
| 78 | |
| 79 D(bug("TryWait semaphore...%lx\n",sem)); | |
| 80 | |
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81 ObtainSemaphore(&sem->Sem); |
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82 // ReleaseSemaphore(&sem->Sem); |
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83 |
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84 return 1; |
| 0 | 85 } |
| 86 | |
| 87 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 88 { | |
| 89 int retval; | |
| 90 | |
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91 |
| 0 | 92 if ( ! sem ) { |
| 93 SDL_SetError("Passed a NULL semaphore"); | |
| 94 return -1; | |
| 95 } | |
| 96 | |
| 97 D(bug("WaitTimeout (%ld) semaphore...%lx\n",timeout,sem)); | |
| 98 | |
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99 /* A timeout of 0 is an easy case */ |
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100 if ( timeout == 0 ) { |
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101 return SDL_SemTryWait(sem); |
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102 } |
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103 /* |
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104 SDL_LockMutex(sem->count_lock); |
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105 ++sem->waiters_count; |
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106 retval = 0; |
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107 while ( (sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT) ) { |
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108 retval = SDL_CondWaitTimeout(sem->count_nonzero, |
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109 sem->count_lock, timeout); |
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110 } |
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111 --sem->waiters_count; |
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112 --sem->count; |
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113 SDL_UnlockMutex(sem->count_lock); |
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114 */ |
| 0 | 115 if(!(retval=AttemptSemaphore(&sem->Sem))) |
| 116 { | |
| 117 SDL_Delay(timeout); | |
| 118 retval=AttemptSemaphore(&sem->Sem); | |
| 119 } | |
| 120 | |
| 121 if(retval==TRUE) | |
| 122 { | |
| 123 // ReleaseSemaphore(&sem->Sem); | |
| 124 retval=1; | |
| 125 } | |
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126 |
| 0 | 127 return retval; |
| 128 } | |
| 129 | |
| 130 int SDL_SemWait(SDL_sem *sem) | |
| 131 { | |
| 132 ObtainSemaphore(&sem->Sem); | |
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133 return 0; |
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134 // return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); |
| 0 | 135 } |
| 136 | |
| 137 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 138 { | |
| 139 Uint32 value; | |
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140 |
| 0 | 141 value = 0; |
| 142 if ( sem ) { | |
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143 #ifdef STORMC4_WOS |
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144 value = sem->Sem.ssppc_SS.ss_NestCount; |
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145 #else |
| 0 | 146 value = sem->Sem.ss_NestCount; |
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147 #endif |
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148 // SDL_UnlockMutex(sem->count_lock); |
| 0 | 149 } |
| 150 return value; | |
| 151 } | |
| 152 | |
| 153 int SDL_SemPost(SDL_sem *sem) | |
| 154 { | |
| 155 if ( ! sem ) { | |
| 156 SDL_SetError("Passed a NULL semaphore"); | |
| 157 return -1; | |
| 158 } | |
| 159 D(bug("SemPost semaphore...%lx\n",sem)); | |
| 160 | |
| 161 ReleaseSemaphore(&sem->Sem); | |
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162 #if 0 |
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163 SDL_LockMutex(sem->count_lock); |
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164 if ( sem->waiters_count > 0 ) { |
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165 SDL_CondSignal(sem->count_nonzero); |
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166 } |
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167 ++sem->count; |
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168 SDL_UnlockMutex(sem->count_lock); |
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169 #endif |
| 0 | 170 return 0; |
| 171 } | |
| 172 |