Mercurial > sdl-ios-xcode
annotate src/thread/beos/SDL_syssem.c @ 3954:649fba69eccd SDL-1.2
Set supervisor as volatile as it is modified from an interrupt
| author | Patrice Mandin <patmandin@gmail.com> |
|---|---|
| date | Fri, 08 Jun 2007 21:44:40 +0000 |
| parents | d910939febfa |
| children | 782fd950bd46 c121d94672cb a1b03ba2fcd0 |
| rev | line source |
|---|---|
| 0 | 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:
1146
diff
changeset
|
3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 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:
1146
diff
changeset
|
6 modify it under the terms of the GNU Lesser General Public |
| 0 | 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:
1146
diff
changeset
|
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 | |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1146
diff
changeset
|
13 Lesser General Public License for more details. |
| 0 | 14 |
|
1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1146
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:
1146
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:
1146
diff
changeset
|
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
|
252
e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
|
1402
d910939febfa
Use consistent identifiers for the various platforms we support.
Sam Lantinga <slouken@libsdl.org>
parents:
1358
diff
changeset
|
22 #include "SDL_config.h" |
| 0 | 23 |
| 24 /* Semaphores in the BeOS environment */ | |
| 25 | |
| 26 #include <be/kernel/OS.h> | |
| 27 | |
| 28 #include "SDL_thread.h" | |
| 29 | |
| 30 | |
| 31 struct SDL_semaphore { | |
| 32 sem_id id; | |
| 33 }; | |
| 34 | |
| 35 /* Create a counting semaphore */ | |
| 36 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 37 { | |
| 38 SDL_sem *sem; | |
| 39 | |
|
1336
3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
40 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); |
| 0 | 41 if ( sem ) { |
| 42 sem->id = create_sem(initial_value, "SDL semaphore"); | |
| 43 if ( sem->id < B_NO_ERROR ) { | |
| 44 SDL_SetError("create_sem() failed"); | |
|
1336
3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
45 SDL_free(sem); |
| 0 | 46 sem = NULL; |
| 47 } | |
| 48 } else { | |
| 49 SDL_OutOfMemory(); | |
| 50 } | |
| 51 return(sem); | |
| 52 } | |
| 53 | |
| 54 /* Free the semaphore */ | |
| 55 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 56 { | |
| 57 if ( sem ) { | |
| 58 if ( sem->id >= B_NO_ERROR ) { | |
| 59 delete_sem(sem->id); | |
| 60 } | |
|
1336
3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
|
61 SDL_free(sem); |
| 0 | 62 } |
| 63 } | |
| 64 | |
| 65 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 66 { | |
| 67 int32 val; | |
| 68 int retval; | |
| 69 | |
| 70 if ( ! sem ) { | |
| 71 SDL_SetError("Passed a NULL semaphore"); | |
| 72 return -1; | |
| 73 } | |
| 74 | |
| 75 tryagain: | |
| 76 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 77 val = acquire_sem(sem->id); | |
| 78 } else { | |
| 79 timeout *= 1000; /* BeOS uses a timeout in microseconds */ | |
| 80 val = acquire_sem_etc(sem->id, 1, B_RELATIVE_TIMEOUT, timeout); | |
| 81 } | |
| 82 switch (val) { | |
| 83 case B_INTERRUPTED: | |
| 84 goto tryagain; | |
| 85 case B_NO_ERROR: | |
| 86 retval = 0; | |
| 87 break; | |
|
1146
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
88 case B_TIMED_OUT: |
|
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
89 retval = SDL_MUTEX_TIMEDOUT; |
|
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
90 break; |
|
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
91 case B_WOULD_BLOCK: |
|
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
92 retval = SDL_MUTEX_TIMEDOUT; |
|
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
93 break; |
| 0 | 94 default: |
| 95 SDL_SetError("acquire_sem() failed"); | |
| 96 retval = -1; | |
| 97 break; | |
| 98 } | |
| 99 | |
| 100 return retval; | |
| 101 } | |
| 102 | |
| 103 int SDL_SemTryWait(SDL_sem *sem) | |
| 104 { | |
| 105 return SDL_SemWaitTimeout(sem, 0); | |
| 106 } | |
| 107 | |
| 108 int SDL_SemWait(SDL_sem *sem) | |
| 109 { | |
| 110 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | |
| 111 } | |
| 112 | |
| 113 /* Returns the current count of the semaphore */ | |
| 114 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 115 { | |
| 116 int32 count; | |
| 117 Uint32 value; | |
| 118 | |
| 119 value = 0; | |
| 120 if ( sem ) { | |
| 121 get_sem_count(sem->id, &count); | |
| 122 if ( count > 0 ) { | |
| 123 value = (Uint32)count; | |
| 124 } | |
| 125 } | |
| 126 return value; | |
| 127 } | |
| 128 | |
| 129 /* Atomically increases the semaphore's count (not blocking) */ | |
| 130 int SDL_SemPost(SDL_sem *sem) | |
| 131 { | |
| 132 if ( ! sem ) { | |
| 133 SDL_SetError("Passed a NULL semaphore"); | |
| 134 return -1; | |
| 135 } | |
| 136 | |
| 137 if ( release_sem(sem->id) != B_NO_ERROR ) { | |
| 138 SDL_SetError("release_sem() failed"); | |
| 139 return -1; | |
| 140 } | |
| 141 return 0; | |
| 142 } |