Mercurial > sdl-ios-xcode
annotate src/thread/amigaos/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 | |
|
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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 | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
|
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28 /* BeOS thread management routines for SDL */ |
| 0 | 29 |
| 30 #include "SDL_error.h" | |
| 31 #include "SDL_mutex.h" | |
| 32 #include "SDL_thread.h" | |
| 33 #include "SDL_thread_c.h" | |
| 34 #include "SDL_systhread.h" | |
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35 #include "mydebug.h" |
| 0 | 36 |
| 37 typedef struct { | |
| 38 int (*func)(void *); | |
| 39 void *data; | |
| 40 SDL_Thread *info; | |
| 41 struct Task *wait; | |
| 42 } thread_args; | |
| 43 | |
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44 #ifndef MORPHOS |
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45 |
| 0 | 46 #if defined(__SASC) && !defined(__PPC__) |
| 47 __saveds __asm Uint32 RunThread(register __a0 char *args ) | |
| 48 #elif defined(__PPC__) | |
| 49 Uint32 RunThread(char *args) | |
| 50 #else | |
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51 Uint32 __saveds RunThread(char *args __asm("a0") ) |
| 0 | 52 #endif |
| 53 { | |
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54 #ifdef STORMC4_WOS |
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55 thread_args *data=(thread_args *)args; |
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56 #else |
| 0 | 57 thread_args *data=(thread_args *)atol(args); |
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58 #endif |
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59 |
| 0 | 60 struct Task *Father; |
| 61 | |
| 62 D(bug("Received data: %lx\n",data)); | |
| 63 Father=data->wait; | |
| 64 | |
| 65 SDL_RunThread(data); | |
| 66 | |
| 67 Signal(Father,SIGBREAKF_CTRL_F); | |
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68 D(bug("Thread with data %lx ended\n",data)); |
| 0 | 69 return(0); |
| 70 } | |
| 71 | |
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72 #else |
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73 |
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74 #include <emul/emulinterface.h> |
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75 |
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76 Uint32 RunTheThread(void) |
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77 { |
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78 thread_args *data=(thread_args *)atol((char *)REG_A0); |
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79 struct Task *Father; |
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80 |
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81 D(bug("Received data: %lx\n",data)); |
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82 Father=data->wait; |
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83 |
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84 SDL_RunThread(data); |
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85 |
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86 Signal(Father,SIGBREAKF_CTRL_F); |
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87 D(bug("Thread with data %lx ended\n",data)); |
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88 return(0); |
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89 } |
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90 |
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91 struct EmulLibEntry RunThreadStruct= |
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92 { |
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93 TRAP_LIB, |
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94 0, |
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95 (ULONG)RunTheThread |
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96 }; |
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97 |
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98 void *RunThread=&RunThreadStruct; |
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99 #endif |
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100 |
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101 |
| 0 | 102 int SDL_SYS_CreateThread(SDL_Thread *thread, void *args) |
| 103 { | |
| 104 /* Create the thread and go! */ | |
| 105 char buffer[20]; | |
| 106 | |
| 107 D(bug("Sending %lx to the new thread...\n",args)); | |
| 108 | |
| 109 if(args) | |
| 110 sprintf(buffer,"%ld",args); | |
| 111 | |
|
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112 #ifdef STORMC4_WOS |
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113 thread->handle=CreateTaskPPCTags(TASKATTR_CODE, RunThread, |
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114 TASKATTR_NAME, "SDL subtask", |
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115 TASKATTR_STACKSIZE, 100000, |
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116 (args ? TASKATTR_R3 : TAG_IGNORE), args, |
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117 TASKATTR_INHERITR2, TRUE, |
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118 TAG_DONE); |
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119 #else |
| 0 | 120 thread->handle=(struct Task *)CreateNewProcTags(NP_Output,Output(), |
| 121 NP_Name,(ULONG)"SDL subtask", | |
| 122 NP_CloseOutput, FALSE, | |
| 123 NP_StackSize,20000, | |
| 124 NP_Entry,(ULONG)RunThread, | |
| 125 args ? NP_Arguments : TAG_IGNORE,(ULONG)buffer, | |
| 126 TAG_DONE); | |
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127 #endif |
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128 |
| 0 | 129 if(!thread->handle) |
| 130 { | |
| 131 SDL_SetError("Not enough resources to create thread"); | |
| 132 return(-1); | |
| 133 } | |
| 134 | |
| 135 return(0); | |
| 136 } | |
| 137 | |
| 138 void SDL_SYS_SetupThread(void) | |
| 139 { | |
| 140 } | |
| 141 | |
| 142 Uint32 SDL_ThreadID(void) | |
| 143 { | |
| 144 return((Uint32)FindTask(NULL)); | |
| 145 } | |
| 146 | |
| 147 void SDL_SYS_WaitThread(SDL_Thread *thread) | |
| 148 { | |
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149 SetSignal(0L,SIGBREAKF_CTRL_F|SIGBREAKF_CTRL_C); |
| 0 | 150 Wait(SIGBREAKF_CTRL_F|SIGBREAKF_CTRL_C); |
| 151 } | |
| 152 | |
| 153 void SDL_SYS_KillThread(SDL_Thread *thread) | |
| 154 { | |
| 155 Signal((struct Task *)thread->handle,SIGBREAKF_CTRL_C); | |
| 156 } |