author | Ryan C. Gordon <icculus@icculus.org> |
Tue, 27 Sep 2005 11:27:38 +0000 | |
changeset 1146 | ab0154afe938 |
parent 769 | b8d311d90021 |
child 1312 | c9b51268668f |
permissions | -rw-r--r-- |
0 | 1 |
/* |
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SDL - Simple DirectMedia Layer |
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769
b8d311d90021
Updated copyright information for 2004 (Happy New Year!)
Sam Lantinga <slouken@libsdl.org>
parents:
297
diff
changeset
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Copyright (C) 1997-2004 Sam Lantinga |
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This library is free software; you can redistribute it and/or |
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modify it under the terms of the GNU Library General Public |
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License as published by the Free Software Foundation; either |
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version 2 of the License, or (at your option) any later version. |
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This library is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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Library General Public License for more details. |
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You should have received a copy of the GNU Library General Public |
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License along with this library; if not, write to the Free |
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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Sam Lantinga |
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e8157fcb3114
Updated the source with the correct e-mail address
Sam Lantinga <slouken@libsdl.org>
parents:
0
diff
changeset
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slouken@libsdl.org |
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*/ |
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#ifdef SAVE_RCSID |
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static char rcsid = |
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"@(#) $Id$"; |
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#endif |
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/* Semaphores in the BeOS environment */ |
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#include <be/kernel/OS.h> |
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#include "SDL_error.h" |
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#include "SDL_thread.h" |
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struct SDL_semaphore { |
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sem_id id; |
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}; |
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/* Create a counting semaphore */ |
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SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) |
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{ |
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SDL_sem *sem; |
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sem = (SDL_sem *)malloc(sizeof(*sem)); |
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if ( sem ) { |
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sem->id = create_sem(initial_value, "SDL semaphore"); |
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if ( sem->id < B_NO_ERROR ) { |
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SDL_SetError("create_sem() failed"); |
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free(sem); |
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sem = NULL; |
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} |
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} else { |
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SDL_OutOfMemory(); |
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} |
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return(sem); |
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} |
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/* Free the semaphore */ |
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void SDL_DestroySemaphore(SDL_sem *sem) |
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{ |
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if ( sem ) { |
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if ( sem->id >= B_NO_ERROR ) { |
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delete_sem(sem->id); |
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} |
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free(sem); |
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} |
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} |
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int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) |
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{ |
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int32 val; |
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int retval; |
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if ( ! sem ) { |
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SDL_SetError("Passed a NULL semaphore"); |
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return -1; |
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} |
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tryagain: |
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if ( timeout == SDL_MUTEX_MAXWAIT ) { |
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val = acquire_sem(sem->id); |
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} else { |
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timeout *= 1000; /* BeOS uses a timeout in microseconds */ |
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val = acquire_sem_etc(sem->id, 1, B_RELATIVE_TIMEOUT, timeout); |
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} |
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switch (val) { |
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case B_INTERRUPTED: |
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goto tryagain; |
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case B_NO_ERROR: |
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retval = 0; |
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break; |
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1146
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
93 |
case B_TIMED_OUT: |
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
94 |
retval = SDL_MUTEX_TIMEDOUT; |
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
95 |
break; |
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
96 |
case B_WOULD_BLOCK: |
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
97 |
retval = SDL_MUTEX_TIMEDOUT; |
ab0154afe938
Date: Sat, 17 Sep 2005 13:38:49 +0200
Ryan C. Gordon <icculus@icculus.org>
parents:
769
diff
changeset
|
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break; |
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default: |
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SDL_SetError("acquire_sem() failed"); |
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retval = -1; |
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break; |
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} |
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return retval; |
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} |
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int SDL_SemTryWait(SDL_sem *sem) |
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{ |
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return SDL_SemWaitTimeout(sem, 0); |
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} |
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int SDL_SemWait(SDL_sem *sem) |
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{ |
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return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT); |
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} |
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/* Returns the current count of the semaphore */ |
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Uint32 SDL_SemValue(SDL_sem *sem) |
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{ |
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int32 count; |
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Uint32 value; |
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value = 0; |
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if ( sem ) { |
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get_sem_count(sem->id, &count); |
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if ( count > 0 ) { |
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value = (Uint32)count; |
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} |
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} |
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return value; |
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} |
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/* Atomically increases the semaphore's count (not blocking) */ |
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int SDL_SemPost(SDL_sem *sem) |
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{ |
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if ( ! sem ) { |
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SDL_SetError("Passed a NULL semaphore"); |
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return -1; |
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} |
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if ( release_sem(sem->id) != B_NO_ERROR ) { |
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SDL_SetError("release_sem() failed"); |
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return -1; |
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} |
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return 0; |
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} |