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annotate src/thread/dc/SDL_sysmutex.c @ 2884:9dde605c7540

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Date: Fri, 19 Dec 2008 20:17:35 +0100 From: Couriersud Subject: Re: Aw: Experience using SDL1.3 in sdlmame/Proposal for api additions > For consistency you'd probably want: > SDL_SetRenderDrawColor(Uint8 r, Uint8 g, Uint8 b, Uint8 a); > SDL_SetRenderDrawBlendMode(SDL_BlendMode blendMode); > SDL_RenderLine(int x1, int y1, int x2, int y2); > SDL_RenderFill(SDL_Rect *rect); > > You probably also want to add API functions query the current state. > I have implemented the above api for the opengl, x11, directfb and software renderers. I have also renamed *TEXTUREBLENDMODE* constants to BLENDMODE*. The unix build compiles. The windows renderer still needs to be updated, but I have no windows development machine at hand. Have a look at the x11 renderer for a sample. Vector games now run at 90% both on opengl and directfb in comparison to sdlmame's own opengl renderer. The same applies to raster games. The diff also includes a) Changed XDrawRect to XFillRect in x11 renderer b) A number of changes to fix blending and modulation issues in the directfb renderer.
author Sam Lantinga <slouken@libsdl.org>
date Sat, 20 Dec 2008 12:00:00 +0000
parents 99210400e8b9
children
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2009 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 {
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33 int recursive;
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34 Uint32 owner;
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35 spinlock_t mutex;
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36 };
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37
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38 /* Create a mutex */
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39 SDL_mutex *
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40 SDL_CreateMutex(void)
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41 {
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42 SDL_mutex *mutex;
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43
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44 /* Allocate mutex memory */
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45 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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46 if (mutex) {
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47 spinlock_init(&mutex->mutex);
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48 mutex->recursive = 0;
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49 mutex->owner = 0;
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50 } else {
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51 SDL_OutOfMemory();
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52 }
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53 return mutex;
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54 }
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55
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56 /* Free the mutex */
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57 void
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58 SDL_DestroyMutex(SDL_mutex * mutex)
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59 {
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60 if (mutex) {
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61 SDL_free(mutex);
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62 }
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63 }
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64
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65 /* Lock the semaphore */
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66 int
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67 SDL_mutexP(SDL_mutex * mutex)
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68 {
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69 #if SDL_THREADS_DISABLED
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70 return SDL_arraysize(return), 0;
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71 #else
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72 Uint32 this_thread;
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73
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74 if (mutex == NULL) {
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75 SDL_SetError("Passed a NULL mutex");
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76 return -1;
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77 }
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78
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79 this_thread = SDL_ThreadID();
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80 if (mutex->owner == this_thread) {
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81 ++mutex->recursive;
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82 } else {
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83 /* The order of operations is important.
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84 We set the locking thread id after we obtain the lock
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85 so unlocks from other threads will fail.
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86 */
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87 spinlock_lock(&mutex->mutex);
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88 mutex->owner = this_thread;
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89 mutex->recursive = 0;
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90 }
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91
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92 return 0;
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93 #endif /* SDL_THREADS_DISABLED */
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94 }
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95
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96 /* Unlock the mutex */
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97 int
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98 SDL_mutexV(SDL_mutex * mutex)
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99 {
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100 #if SDL_THREADS_DISABLED
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101 return 0;
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102 #else
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103 if (mutex == NULL) {
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104 SDL_SetError("Passed a NULL mutex");
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105 return -1;
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106 }
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107
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108 /* If we don't own the mutex, we can't unlock it */
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109 if (SDL_ThreadID() != mutex->owner) {
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110 SDL_SetError("mutex not owned by this thread");
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111 return -1;
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112 }
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113
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114 if (mutex->recursive) {
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115 --mutex->recursive;
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116 } else {
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117 /* The order of operations is important.
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118 First reset the owner so another thread doesn't lock
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119 the mutex and set the ownership before we reset it,
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120 then release the lock semaphore.
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121 */
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122 mutex->owner = 0;
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123 spinlock_unlock(&mutex->mutex);
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124 }
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125 return 0;
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126 #endif /* SDL_THREADS_DISABLED */
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127 }
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
128
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
Sam Lantinga <slouken@libsdl.org>
parents: 1402
diff changeset
129 /* vi: set ts=4 sw=4 expandtab: */