Mercurial > sdl-ios-xcode
annotate src/thread/amigaos/SDL_syssem.c @ 878:c7ca0f3cbca2
Argh...
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 08 Apr 2004 21:06:10 +0000 |
| parents | b8d311d90021 |
| children | c9b51268668f |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
769
b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
|
3 Copyright (C) 1997-2004 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 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 | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
21
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
28 /* An implementation of semaphores using mutexes and condition variables */ |
| 0 | 29 |
| 30 #include "SDL_error.h" | |
| 31 #include "SDL_thread.h" | |
| 32 #include "SDL_systhread_c.h" | |
| 33 | |
| 34 | |
| 35 struct SDL_semaphore | |
| 36 { | |
| 37 struct SignalSemaphore Sem; | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
38 Uint32 count; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
39 Uint32 waiters_count; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
40 SDL_mutex *count_lock; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
41 SDL_cond *count_nonzero; |
| 0 | 42 }; |
| 43 | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
44 #undef D |
| 0 | 45 |
| 46 #define D(x) | |
| 47 | |
| 48 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 49 { | |
| 50 SDL_sem *sem; | |
| 51 | |
| 52 sem = (SDL_sem *)malloc(sizeof(*sem)); | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
53 |
| 0 | 54 if ( ! sem ) { |
| 55 SDL_OutOfMemory(); | |
| 56 return(0); | |
| 57 } | |
| 58 | |
| 59 D(bug("Creating semaphore %lx...\n",sem)); | |
| 60 | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
61 memset(sem,0,sizeof(*sem)); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
62 |
| 0 | 63 InitSemaphore(&sem->Sem); |
|
255
dcb5e869f8b5
Updated Amiga port by Gabriele Greco
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
64 |
| 0 | 65 return(sem); |
| 66 } | |
| 67 | |
| 68 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 69 { | |
| 70 D(bug("Destroying semaphore %lx...\n",sem)); | |
| 71 | |
| 72 if ( sem ) { | |
| 73 // Condizioni per liberare i task in attesa? | |
| 74 free(sem); | |
| 75 } | |
| 76 } | |
| 77 | |
| 78 int SDL_SemTryWait(SDL_sem *sem) | |
| 79 { | |
| 80 if ( ! sem ) { | |
| 81 SDL_SetError("Passed a NULL semaphore"); | |
| 82 return -1; | |
| 83 } | |
| 84 | |
| 85 D(bug("TryWait semaphore...%lx\n",sem)); | |
| 86 | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
87 ObtainSemaphore(&sem->Sem); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
88 // ReleaseSemaphore(&sem->Sem); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
89 |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
90 return 1; |
| 0 | 91 } |
| 92 | |
| 93 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 94 { | |
| 95 int retval; | |
| 96 | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
97 |
| 0 | 98 if ( ! sem ) { |
| 99 SDL_SetError("Passed a NULL semaphore"); | |
| 100 return -1; | |
| 101 } | |
| 102 | |
| 103 D(bug("WaitTimeout (%ld) semaphore...%lx\n",timeout,sem)); | |
| 104 | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
105 /* A timeout of 0 is an easy case */ |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
106 if ( timeout == 0 ) { |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
107 return SDL_SemTryWait(sem); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
108 } |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
109 /* |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
110 SDL_LockMutex(sem->count_lock); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
111 ++sem->waiters_count; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
112 retval = 0; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
113 while ( (sem->count == 0) && (retval != SDL_MUTEX_TIMEDOUT) ) { |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
114 retval = SDL_CondWaitTimeout(sem->count_nonzero, |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
115 sem->count_lock, timeout); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
116 } |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
117 --sem->waiters_count; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
118 --sem->count; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
119 SDL_UnlockMutex(sem->count_lock); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
120 */ |
| 0 | 121 if(!(retval=AttemptSemaphore(&sem->Sem))) |
| 122 { | |
| 123 SDL_Delay(timeout); | |
| 124 retval=AttemptSemaphore(&sem->Sem); | |
| 125 } | |
| 126 | |
| 127 if(retval==TRUE) | |
| 128 { | |
| 129 // ReleaseSemaphore(&sem->Sem); | |
| 130 retval=1; | |
| 131 } | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
132 |
| 0 | 133 return retval; |
| 134 } | |
| 135 | |
| 136 int SDL_SemWait(SDL_sem *sem) | |
| 137 { | |
| 138 ObtainSemaphore(&sem->Sem); | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
139 return 0; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
140 // return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); |
| 0 | 141 } |
| 142 | |
| 143 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 144 { | |
| 145 Uint32 value; | |
|
255
dcb5e869f8b5
Updated Amiga port by Gabriele Greco
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
146 |
| 0 | 147 value = 0; |
| 148 if ( sem ) { | |
|
255
dcb5e869f8b5
Updated Amiga port by Gabriele Greco
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
149 #ifdef STORMC4_WOS |
|
dcb5e869f8b5
Updated Amiga port by Gabriele Greco
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
150 value = sem->Sem.ssppc_SS.ss_NestCount; |
|
dcb5e869f8b5
Updated Amiga port by Gabriele Greco
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
151 #else |
| 0 | 152 value = sem->Sem.ss_NestCount; |
|
255
dcb5e869f8b5
Updated Amiga port by Gabriele Greco
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
153 #endif |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
154 // SDL_UnlockMutex(sem->count_lock); |
| 0 | 155 } |
| 156 return value; | |
| 157 } | |
| 158 | |
| 159 int SDL_SemPost(SDL_sem *sem) | |
| 160 { | |
| 161 if ( ! sem ) { | |
| 162 SDL_SetError("Passed a NULL semaphore"); | |
| 163 return -1; | |
| 164 } | |
| 165 D(bug("SemPost semaphore...%lx\n",sem)); | |
| 166 | |
| 167 ReleaseSemaphore(&sem->Sem); | |
|
21
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
168 #if 0 |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
169 SDL_LockMutex(sem->count_lock); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
170 if ( sem->waiters_count > 0 ) { |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
171 SDL_CondSignal(sem->count_nonzero); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
172 } |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
173 ++sem->count; |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
174 SDL_UnlockMutex(sem->count_lock); |
|
75a95f82bc1f
Updated the Amiga OS port of SDL (thanks Gabriele)
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
|
175 #endif |
| 0 | 176 return 0; |
| 177 } | |
| 178 |