Mercurial > sdl-ios-xcode
annotate src/thread/beos/SDL_syssem.c @ 866:0a45995a7fc3
Date: Tue, 2 Mar 2004 11:34:54 +0100
From: Bartosz Fenski aka fEnIo
Subject: outdated entry in INSTALL file
I've just found in INSTALL file:
If you are cross-compiling from Linux to Win32, you should read
the file README.Win32
But you don't shipped this file with SDL. I've found in CVS logs that
this file has been deleted and this information is now in FAQ.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Tue, 02 Mar 2004 13:01:02 +0000 |
| parents | b8d311d90021 |
| children | ab0154afe938 |
| 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:
0
diff
changeset
|
20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 /* Semaphores in the BeOS environment */ | |
| 29 | |
| 30 #include <be/kernel/OS.h> | |
| 31 | |
| 32 #include "SDL_error.h" | |
| 33 #include "SDL_thread.h" | |
| 34 | |
| 35 | |
| 36 struct SDL_semaphore { | |
| 37 sem_id id; | |
| 38 }; | |
| 39 | |
| 40 /* Create a counting semaphore */ | |
| 41 SDL_sem *SDL_CreateSemaphore(Uint32 initial_value) | |
| 42 { | |
| 43 SDL_sem *sem; | |
| 44 | |
| 45 sem = (SDL_sem *)malloc(sizeof(*sem)); | |
| 46 if ( sem ) { | |
| 47 sem->id = create_sem(initial_value, "SDL semaphore"); | |
| 48 if ( sem->id < B_NO_ERROR ) { | |
| 49 SDL_SetError("create_sem() failed"); | |
| 50 free(sem); | |
| 51 sem = NULL; | |
| 52 } | |
| 53 } else { | |
| 54 SDL_OutOfMemory(); | |
| 55 } | |
| 56 return(sem); | |
| 57 } | |
| 58 | |
| 59 /* Free the semaphore */ | |
| 60 void SDL_DestroySemaphore(SDL_sem *sem) | |
| 61 { | |
| 62 if ( sem ) { | |
| 63 if ( sem->id >= B_NO_ERROR ) { | |
| 64 delete_sem(sem->id); | |
| 65 } | |
| 66 free(sem); | |
| 67 } | |
| 68 } | |
| 69 | |
| 70 int SDL_SemWaitTimeout(SDL_sem *sem, Uint32 timeout) | |
| 71 { | |
| 72 int32 val; | |
| 73 int retval; | |
| 74 | |
| 75 if ( ! sem ) { | |
| 76 SDL_SetError("Passed a NULL semaphore"); | |
| 77 return -1; | |
| 78 } | |
| 79 | |
| 80 tryagain: | |
| 81 if ( timeout == SDL_MUTEX_MAXWAIT ) { | |
| 82 val = acquire_sem(sem->id); | |
| 83 } else { | |
| 84 timeout *= 1000; /* BeOS uses a timeout in microseconds */ | |
| 85 val = acquire_sem_etc(sem->id, 1, B_RELATIVE_TIMEOUT, timeout); | |
| 86 } | |
| 87 switch (val) { | |
| 88 case B_INTERRUPTED: | |
| 89 goto tryagain; | |
| 90 case B_NO_ERROR: | |
| 91 retval = 0; | |
| 92 break; | |
| 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 } |