Mercurial > sdl-ios-xcode
annotate src/audio/SDL_audiomem.c @ 1312:c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
I batch edited these files, so please let me know if I've accidentally removed anybody's
credit here.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 06:32:25 +0000 |
| parents | b8d311d90021 |
| children | 450721ad5436 |
| 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:
769
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:
769
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:
769
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:
769
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:
769
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:
769
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:
769
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:
1
diff
changeset
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 /* Functions to allocate audio buffer memory, shareable across threads | |
| 24 (necessary because SDL audio emulates threads with fork() | |
| 25 */ | |
| 26 | |
|
1
cf2af46e9e2a
Changes since SDL 1.2.0 release
Sam Lantinga <slouken@lokigames.com>
parents:
0
diff
changeset
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27 #include <stdlib.h> |
| 0 | 28 #ifdef FORK_HACK |
| 29 #include <sys/types.h> | |
| 30 #include <sys/ipc.h> | |
| 31 #include <sys/shm.h> | |
| 32 #include <stddef.h> | |
| 33 #endif | |
| 34 | |
| 35 #include "SDL_audiomem.h" | |
| 36 | |
| 37 /* Allocate memory that will be shared between threads (freed on exit) */ | |
| 38 void *SDL_AllocAudioMem(int size) | |
| 39 { | |
| 40 void *chunk; | |
| 41 | |
| 42 #ifdef FORK_HACK | |
| 43 int semid; | |
| 44 | |
| 45 /* Create and get the address of a shared memory segment */ | |
| 46 semid = shmget(IPC_PRIVATE, size, (IPC_CREAT|0600)); | |
| 47 if ( semid < 0 ) { | |
| 48 return(NULL); | |
| 49 } | |
| 50 chunk = shmat(semid, NULL, 0); | |
| 51 | |
| 52 /* Set the segment for deletion when it is detatched */ | |
| 53 shmctl(semid, IPC_RMID, NULL); /* Delets semid if shmat() fails */ | |
| 54 #else | |
| 55 chunk = malloc(size); | |
| 56 #endif | |
| 57 return((void *)chunk); | |
| 58 } | |
| 59 | |
| 60 void SDL_FreeAudioMem(void *chunk) | |
| 61 { | |
| 62 #ifdef FORK_HACK | |
| 63 shmdt(chunk); | |
| 64 #else | |
| 65 free(chunk); | |
| 66 #endif | |
| 67 } |