annotate src/thread/amigaos/SDL_systhread_c.h @ 968:4675910b0b7b

Date: Mon, 11 Oct 2004 15:17:27 +0300 (EEST) From: Hannu Savolainen Subject: Re: SDL uses obsolete OSS features I did some work on getting OSS to work better with SDL. There have been some problems with select which should be fixed now. I'm having some problems in understanding what is the purpose of the DSP_WaitAudio() routine. I added a return to the very beginning of this routine and commendted out the define for USE_BLOCKING_WRITES. At least lbreakout2 seems to work as well as earlier. The latencies are the same. An ordinary blocking write does exactly the same thing than DSP_WaitAudio does. So I would recommend using the USE_BLOCKING_WRITES approach and removing everything from the DSP_WaitAudio routine. Also enabling USE_BLOCKING_WRITES makes it possible to simplify DSP_PlayAudio() because you don't need to handle the partial writes (the do-while loop). Attached is a patch against SDL-1.2.7. After these changes SDL will use OSS as it's designed to be used (make it as simple as possible). This code should work with all OSS implementations because it uses only the very fundamental features that have been there since the jurassic times.
author Sam Lantinga <slouken@libsdl.org>
date Fri, 12 Nov 2004 21:39:04 +0000
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2004 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Library General Public License for more details.
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14
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15 You should have received a copy of the GNU Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #include <exec/exec.h>
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29 #include <dos/dos.h>
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30 #include <dos/dostags.h>
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31 #if defined (__SASC) || defined(STORMC4_WOS)
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32 #include <proto/dos.h>
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33 #include <proto/exec.h>
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34 #else
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35 #include <inline/dos.h>
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36 #include <inline/exec.h>
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37 #endif
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38
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39 #include <stdio.h>
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40 #include <stdlib.h>
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41 #include <string.h>
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42 #include "mydebug.h"
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43
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44 extern struct ExecBase *SysBase;
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45 extern struct DosLibrary *DOSBase;
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46
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47 #ifdef STORMC4_WOS
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48 #include <proto/powerpc.h>
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49
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50 /* use powerpc.library functions instead og exec */
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51 #define SYS_ThreadHandle struct TaskPPC *
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52 #define Signal SignalPPC
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53 #define Wait WaitPPC
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54 #define Task TaskPPC
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55 #define FindTask FindTaskPPC
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56 #define SetSignal SetSignalPPC
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58 #define InitSemaphore InitSemaphorePPC
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59 #define ObtainSemaphore ObtainSemaphorePPC
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60 #define AttemptSemaphore AttemptSemaphorePPC
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61 #define ReleaseSemaphore ReleaseSemaphorePPC
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62 #define SignalSemaphore SignalSemaphorePPC
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64 #else
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65
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66 #define SYS_ThreadHandle struct Task *
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67 #endif /*STORMC4_WOS*/
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