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annotate src/thread/dc/SDL_sysmutex.c @ 1554:0ca607a5d173

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Fixed bug #84 Date: Sun, 23 Oct 2005 16:39:03 +0200 From: "A. Schmid" <sahib@phreaker.net> Subject: [SDL] no software surfaces with svgalib driver? Hi, I noticed that the SDL (1.2.9) svgalib driver only makes use of linear addressable (framebuffer) video modes. On older systems (like one of mine), linear addressable modes are often not available. Especially for cards with VESA VBE < 2.0 the svgalib vesa driver is unusable, since VESA only supports framebuffering for VBE 2.0 and later. The changes necessary to add support for software surfaces seem to be relatively small. I only had to hack src/video/svga/SDL_svgavideo.c (see attached patch). The code worked fine for me, but it is no more than a proof of concept and should be reviewed (probably has a memory leak when switching modes). It also uses the vgagl library (included in the svgalib package) and needs to be linked against it. -Alex
author Sam Lantinga <slouken@libsdl.org>
date Sun, 19 Mar 2006 12:04:40 +0000
parents d910939febfa
children 782fd950bd46 c121d94672cb a1b03ba2fcd0
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 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 Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 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 Lesser 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 Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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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 #include "SDL_config.h"
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23
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24 /* An implementation of mutexes using semaphores */
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25
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26 #include "SDL_thread.h"
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27 #include "SDL_systhread_c.h"
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28
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29 #include <arch/spinlock.h>
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30
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31 struct SDL_mutex {
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32 int recursive;
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33 Uint32 owner;
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34 spinlock_t mutex;
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35 };
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36
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37 /* Create a mutex */
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38 SDL_mutex *SDL_CreateMutex(void)
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39 {
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40 SDL_mutex *mutex;
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41
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42 /* Allocate mutex memory */
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43 mutex = (SDL_mutex *)SDL_malloc(sizeof(*mutex));
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44 if ( mutex ) {
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45 spinlock_init(&mutex->mutex);
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46 mutex->recursive = 0;
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47 mutex->owner = 0;
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48 } else {
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49 SDL_OutOfMemory();
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50 }
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51 return mutex;
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52 }
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53
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54 /* Free the mutex */
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55 void SDL_DestroyMutex(SDL_mutex *mutex)
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56 {
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57 if ( mutex ) {
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58 SDL_free(mutex);
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59 }
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60 }
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61
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62 /* Lock the semaphore */
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63 int SDL_mutexP(SDL_mutex *mutex)
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64 {
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65 #if SDL_THREADS_DISABLED
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66 return SDL_arraysize(return ),0;
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67 #else
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68 Uint32 this_thread;
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69
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70 if ( mutex == NULL ) {
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71 SDL_SetError("Passed a NULL mutex");
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72 return -1;
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73 }
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74
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75 this_thread = SDL_ThreadID();
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76 if ( mutex->owner == this_thread ) {
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77 ++mutex->recursive;
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78 } else {
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79 /* The order of operations is important.
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80 We set the locking thread id after we obtain the lock
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81 so unlocks from other threads will fail.
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82 */
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83 spinlock_lock(&mutex->mutex);
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84 mutex->owner = this_thread;
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85 mutex->recursive = 0;
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86 }
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87
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88 return 0;
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89 #endif /* SDL_THREADS_DISABLED */
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90 }
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91
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92 /* Unlock the mutex */
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93 int SDL_mutexV(SDL_mutex *mutex)
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94 {
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95 #if SDL_THREADS_DISABLED
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96 return 0;
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97 #else
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98 if ( mutex == NULL ) {
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99 SDL_SetError("Passed a NULL mutex");
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100 return -1;
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101 }
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102
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103 /* If we don't own the mutex, we can't unlock it */
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104 if ( SDL_ThreadID() != mutex->owner ) {
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105 SDL_SetError("mutex not owned by this thread");
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106 return -1;
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107 }
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108
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109 if ( mutex->recursive ) {
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110 --mutex->recursive;
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111 } else {
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112 /* The order of operations is important.
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113 First reset the owner so another thread doesn't lock
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114 the mutex and set the ownership before we reset it,
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115 then release the lock semaphore.
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116 */
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117 mutex->owner = 0;
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118 spinlock_unlock(&mutex->mutex);
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119 }
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120 return 0;
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121 #endif /* SDL_THREADS_DISABLED */
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122 }