Mercurial > sdl-ios-xcode
annotate src/thread/beos/SDL_systhread.c @ 765:4c2ba6161939
Editors Note: The original patch was modified to use SDL_Delay() instead of
nanosleep because nanosleep may not be portable to all systems
using SDL with the ALSA backend. This may be a moot point with
the switch to blocking writes anyway...
Date: Sat, 27 Dec 2003 21:47:36 +0100
From: Michel Daenzer
To: Debian Bug Tracking System
Subject: [SDL] Bug#225252: [PATCH] ALSA fixes
Package: libsdl1.2debian-all
Version: 1.2.6-2
Severity: normal
Tags: patch
For SDL 1.2.6, the ALSA backend was changed to call snd_pcm_open() with
SND_PCM_NONBLOCK. That's a good idea per se, however, it causes high CPU
usage, interrupted sound and stuttering in some games here. Taking a nanosleep
whenever snd_pcm_writei() returns -EAGAIN fixes this, but I think it's more
efficient to use blocking mode for the actual sound playback. Feedback from the
SDL and ALSA lists appreciated.
The patch also fixes the default ALSA device to be used.
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Sun, 04 Jan 2004 15:40:50 +0000 |
| parents | f6ffac90895c |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
297
f6ffac90895c
Updated copyright information for 2002
Sam Lantinga <slouken@libsdl.org>
parents:
252
diff
changeset
|
3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 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 /* BeOS thread management routines for SDL */ | |
| 29 | |
| 30 #include <stdio.h> | |
| 31 #include <signal.h> | |
| 32 #include <be/kernel/OS.h> | |
| 33 | |
| 34 #include "SDL_error.h" | |
| 35 #include "SDL_mutex.h" | |
| 36 #include "SDL_thread.h" | |
| 37 #include "SDL_thread_c.h" | |
| 38 #include "SDL_systhread.h" | |
| 39 | |
| 40 | |
| 41 static int sig_list[] = { | |
| 42 SIGHUP, SIGINT, SIGQUIT, SIGPIPE, SIGALRM, SIGTERM, SIGWINCH, 0 | |
| 43 }; | |
| 44 | |
| 45 void SDL_MaskSignals(sigset_t *omask) | |
| 46 { | |
| 47 sigset_t mask; | |
| 48 int i; | |
| 49 | |
| 50 sigemptyset(&mask); | |
| 51 for ( i=0; sig_list[i]; ++i ) { | |
| 52 sigaddset(&mask, sig_list[i]); | |
| 53 } | |
| 54 sigprocmask(SIG_BLOCK, &mask, omask); | |
| 55 } | |
| 56 void SDL_UnmaskSignals(sigset_t *omask) | |
| 57 { | |
| 58 sigprocmask(SIG_SETMASK, omask, NULL); | |
| 59 } | |
| 60 | |
| 61 static int32 RunThread(void *data) | |
| 62 { | |
| 63 SDL_RunThread(data); | |
| 64 return(0); | |
| 65 } | |
| 66 | |
| 67 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args) | |
| 68 { | |
| 69 /* Create the thread and go! */ | |
| 70 thread->handle=spawn_thread(RunThread, "SDL", B_NORMAL_PRIORITY, args); | |
| 71 if ( (thread->handle == B_NO_MORE_THREADS) || | |
| 72 (thread->handle == B_NO_MEMORY) ) { | |
| 73 SDL_SetError("Not enough resources to create thread"); | |
| 74 return(-1); | |
| 75 } | |
| 76 resume_thread(thread->handle); | |
| 77 return(0); | |
| 78 } | |
| 79 | |
| 80 void SDL_SYS_SetupThread(void) | |
| 81 { | |
| 82 /* Mask asynchronous signals for this thread */ | |
| 83 SDL_MaskSignals(NULL); | |
| 84 } | |
| 85 | |
| 86 Uint32 SDL_ThreadID(void) | |
| 87 { | |
| 88 return((Uint32)find_thread(NULL)); | |
| 89 } | |
| 90 | |
| 91 void SDL_SYS_WaitThread(SDL_Thread *thread) | |
| 92 { | |
| 93 status_t the_status; | |
| 94 | |
| 95 wait_for_thread(thread->handle, &the_status); | |
| 96 } | |
| 97 | |
| 98 void SDL_SYS_KillThread(SDL_Thread *thread) | |
| 99 { | |
| 100 kill_thread(thread->handle); | |
| 101 } |