Mercurial > sdl-ios-xcode
annotate src/thread/os2/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 | 604d73db6802 |
| children | d910939febfa |
| rev | line source |
|---|---|
| 1190 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 1190 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 1190 | 7 License as published by the Free Software Foundation; either |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
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8 version 2.1 of the License, or (at your option) any later version. |
| 1190 | 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 | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
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13 Lesser General Public License for more details. |
| 1190 | 14 |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
15 You should have received a copy of the GNU Lesser General Public |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
16 License along with this library; if not, write to the Free Software |
|
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1190
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 1190 | 18 |
| 19 Sam Lantinga | |
| 20 slouken@libsdl.org | |
| 21 */ | |
| 22 | |
| 23 /* Semaphore functions using the OS/2 API */ | |
| 24 | |
| 25 #define INCL_DOS | |
| 26 #define INCL_DOSERRORS | |
| 27 #define INCL_DOSSEMAPHORES | |
| 28 #include <os2.h> | |
| 29 | |
| 30 #include "SDL_thread.h" | |
| 31 #include "SDL_timer.h" | |
| 32 | |
| 33 | |
| 34 struct SDL_semaphore { | |
| 35 HMTX id; | |
| 36 HEV changed; | |
| 37 Uint32 value; | |
| 38 }; | |
| 39 | |
| 40 | |
| 41 /* Create a semaphore */ | |
| 42 DECLSPEC SDL_sem * SDLCALL SDL_CreateSemaphore(Uint32 initial_value) | |
| 43 { | |
| 44 SDL_sem *sem; | |
| 45 ULONG ulrc; | |
| 46 | |
| 47 /* Allocate sem memory */ | |
|
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Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
48 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); |
| 1190 | 49 if ( sem ) { |
| 50 /* Create the mutex semaphore */ | |
| 51 ulrc = DosCreateMutexSem(NULL,&(sem->id),0,TRUE); | |
| 52 if ( ulrc ) { | |
| 53 SDL_SetError("Couldn't create semaphore"); | |
|
1336
3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
54 SDL_free(sem); |
| 1190 | 55 sem = NULL; |
| 56 } else | |
| 57 { | |
| 58 DosCreateEventSem(NULL, &(sem->changed), 0, FALSE); | |
| 59 sem->value = initial_value; | |
| 60 DosReleaseMutexSem(sem->id); | |
| 61 } | |
| 62 } else { | |
| 63 SDL_OutOfMemory(); | |
| 64 } | |
| 65 return(sem); | |
| 66 } | |
| 67 | |
| 68 /* Free the semaphore */ | |
| 69 DECLSPEC void SDLCALL SDL_DestroySemaphore(SDL_sem *sem) | |
| 70 { | |
| 71 if ( sem ) { | |
| 72 if ( sem->id ) { | |
| 73 DosCloseEventSem(sem->changed); | |
| 74 DosCloseMutexSem(sem->id); | |
| 75 sem->id = 0; | |
| 76 } | |
|
1336
3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
77 SDL_free(sem); |
| 1190 | 78 } |
| 79 } | |
| 80 | |
| 81 DECLSPEC int SDLCALL SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 82 { | |
| 83 ULONG ulrc; | |
| 84 | |
| 85 if ( ! sem ) { | |
| 86 SDL_SetError("Passed a NULL sem"); | |
| 87 return -1; | |
| 88 } | |
| 89 | |
| 90 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 91 while (1) { | |
| 92 ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); | |
| 93 if (ulrc) { | |
| 94 /* if error waiting mutex */ | |
| 95 SDL_SetError("DosRequestMutexSem() failed"); | |
| 96 return -1; | |
| 97 } else if (sem->value) { | |
| 98 sem->value--; | |
| 99 DosReleaseMutexSem(sem->id); | |
| 100 return 0; | |
| 101 } else { | |
| 102 ULONG ulPostCount; | |
| 103 DosResetEventSem(sem->changed, &ulPostCount); | |
| 104 DosReleaseMutexSem(sem->id); | |
| 105 /* continue waiting until somebody posts the semaphore */ | |
| 106 DosWaitEventSem(sem->changed, SEM_INDEFINITE_WAIT); | |
| 107 } | |
| 108 } | |
| 109 } else | |
| 110 if ( timeout == 0 ) | |
| 111 { | |
| 112 ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); | |
| 113 if (ulrc==NO_ERROR) | |
| 114 { | |
| 115 if (sem->value) | |
| 116 { | |
| 117 sem->value--; | |
| 118 DosReleaseMutexSem(sem->id); | |
| 119 return 0; | |
| 120 } else | |
| 121 { | |
| 122 DosReleaseMutexSem(sem->id); | |
| 123 return SDL_MUTEX_TIMEDOUT; | |
| 124 } | |
| 125 } else | |
| 126 { | |
| 127 SDL_SetError("DosRequestMutexSem() failed"); | |
| 128 return -1; | |
| 129 } | |
| 130 } else { | |
| 131 ulrc = DosRequestMutexSem(sem->id, SEM_INDEFINITE_WAIT); | |
| 132 if (ulrc) { | |
| 133 /* if error waiting mutex */ | |
| 134 SDL_SetError("DosRequestMutexSem() failed"); | |
| 135 return -1; | |
| 136 } else | |
| 137 if (sem->value) { | |
| 138 sem->value--; | |
| 139 DosReleaseMutexSem(sem->id); | |
| 140 return 0; | |
| 141 } else { | |
| 142 ULONG ulPostCount; | |
| 143 DosResetEventSem(sem->changed, &ulPostCount); | |
| 144 DosReleaseMutexSem(sem->id); | |
| 145 /* continue waiting until somebody posts the semaphore */ | |
| 146 ulrc = DosWaitEventSem(sem->changed, timeout); | |
| 147 if (ulrc==NO_ERROR) | |
| 148 return 0; | |
| 149 else | |
| 150 return SDL_MUTEX_TIMEDOUT; | |
| 151 } | |
| 152 } | |
| 153 /* never reached */ | |
| 154 return -1; | |
| 155 } | |
| 156 | |
| 157 DECLSPEC int SDLCALL SDL_SemTryWait(SDL_sem *sem) | |
| 158 { | |
| 159 return SDL_SemWaitTimeout(sem, 0); | |
| 160 } | |
| 161 | |
| 162 DECLSPEC int SDLCALL SDL_SemWait(SDL_sem *sem) | |
| 163 { | |
| 164 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | |
| 165 } | |
| 166 | |
| 167 /* Returns the current count of the semaphore */ | |
| 168 DECLSPEC Uint32 SDLCALL SDL_SemValue(SDL_sem *sem) | |
| 169 { | |
| 170 if ( ! sem ) { | |
| 171 SDL_SetError("Passed a NULL sem"); | |
| 172 return 0; | |
| 173 } | |
| 174 return sem->value; | |
| 175 } | |
| 176 | |
| 177 DECLSPEC int SDLCALL SDL_SemPost(SDL_sem *sem) | |
| 178 { | |
| 179 if ( ! sem ) { | |
| 180 SDL_SetError("Passed a NULL sem"); | |
| 181 return -1; | |
| 182 } | |
| 183 if ( DosRequestMutexSem(sem->id,SEM_INDEFINITE_WAIT) ) { | |
| 184 SDL_SetError("DosRequestMutexSem() failed"); | |
| 185 return -1; | |
| 186 } | |
| 187 sem->value++; | |
| 188 DosPostEventSem(sem->changed); | |
| 189 DosReleaseMutexSem(sem->id); | |
| 190 return 0; | |
| 191 } |