Mercurial > sdl-ios-xcode
annotate src/thread/beos/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 | d910939febfa |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
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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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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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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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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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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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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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13 Lesser General Public License for more details. |
| 0 | 14 |
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1312
c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1146
diff
changeset
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15 You should have received a copy of the GNU Lesser General Public |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
1146
diff
changeset
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16 License along with this library; if not, write to the Free Software |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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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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252
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Sam Lantinga <slouken@libsdl.org>
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 /* Semaphores in the BeOS environment */ | |
| 24 | |
| 25 #include <be/kernel/OS.h> | |
| 26 | |
| 27 #include "SDL_thread.h" | |
| 28 | |
| 29 | |
| 30 struct SDL_semaphore { | |
| 31 sem_id id; | |
| 32 }; | |
| 33 | |
| 34 /* Create a counting semaphore */ | |
| 35 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 36 { | |
| 37 SDL_sem *sem; | |
| 38 | |
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39 sem = (SDL_sem *)SDL_malloc(sizeof(*sem)); |
| 0 | 40 if ( sem ) { |
| 41 sem->id = create_sem(initial_value, "SDL semaphore"); | |
| 42 if ( sem->id < B_NO_ERROR ) { | |
| 43 SDL_SetError("create_sem() failed"); | |
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3692456e7b0f
Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
1312
diff
changeset
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44 SDL_free(sem); |
| 0 | 45 sem = NULL; |
| 46 } | |
| 47 } else { | |
| 48 SDL_OutOfMemory(); | |
| 49 } | |
| 50 return(sem); | |
| 51 } | |
| 52 | |
| 53 /* Free the semaphore */ | |
| 54 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 55 { | |
| 56 if ( sem ) { | |
| 57 if ( sem->id >= B_NO_ERROR ) { | |
| 58 delete_sem(sem->id); | |
| 59 } | |
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Use SDL_ prefixed versions of C library functions.
Sam Lantinga <slouken@libsdl.org>
parents:
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diff
changeset
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60 SDL_free(sem); |
| 0 | 61 } |
| 62 } | |
| 63 | |
| 64 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 65 { | |
| 66 int32 val; | |
| 67 int retval; | |
| 68 | |
| 69 if ( ! sem ) { | |
| 70 SDL_SetError("Passed a NULL semaphore"); | |
| 71 return -1; | |
| 72 } | |
| 73 | |
| 74 tryagain: | |
| 75 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 76 val = acquire_sem(sem->id); | |
| 77 } else { | |
| 78 timeout *= 1000; /* BeOS uses a timeout in microseconds */ | |
| 79 val = acquire_sem_etc(sem->id, 1, B_RELATIVE_TIMEOUT, timeout); | |
| 80 } | |
| 81 switch (val) { | |
| 82 case B_INTERRUPTED: | |
| 83 goto tryagain; | |
| 84 case B_NO_ERROR: | |
| 85 retval = 0; | |
| 86 break; | |
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Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
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87 case B_TIMED_OUT: |
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ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
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88 retval = SDL_MUTEX_TIMEDOUT; |
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ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
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diff
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89 break; |
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ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
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90 case B_WOULD_BLOCK: |
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ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
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91 retval = SDL_MUTEX_TIMEDOUT; |
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ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
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92 break; |
| 0 | 93 default: |
| 94 SDL_SetError("acquire_sem() failed"); | |
| 95 retval = -1; | |
| 96 break; | |
| 97 } | |
| 98 | |
| 99 return retval; | |
| 100 } | |
| 101 | |
| 102 int SDL_SemTryWait(SDL_sem *sem) | |
| 103 { | |
| 104 return SDL_SemWaitTimeout(sem, 0); | |
| 105 } | |
| 106 | |
| 107 int SDL_SemWait(SDL_sem *sem) | |
| 108 { | |
| 109 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); | |
| 110 } | |
| 111 | |
| 112 /* Returns the current count of the semaphore */ | |
| 113 Uint32 SDL_SemValue(SDL_sem *sem) | |
| 114 { | |
| 115 int32 count; | |
| 116 Uint32 value; | |
| 117 | |
| 118 value = 0; | |
| 119 if ( sem ) { | |
| 120 get_sem_count(sem->id, &count); | |
| 121 if ( count > 0 ) { | |
| 122 value = (Uint32)count; | |
| 123 } | |
| 124 } | |
| 125 return value; | |
| 126 } | |
| 127 | |
| 128 /* Atomically increases the semaphore's count (not blocking) */ | |
| 129 int SDL_SemPost(SDL_sem *sem) | |
| 130 { | |
| 131 if ( ! sem ) { | |
| 132 SDL_SetError("Passed a NULL semaphore"); | |
| 133 return -1; | |
| 134 } | |
| 135 | |
| 136 if ( release_sem(sem->id) != B_NO_ERROR ) { | |
| 137 SDL_SetError("release_sem() failed"); | |
| 138 return -1; | |
| 139 } | |
| 140 return 0; | |
| 141 } |