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annotate src/thread/generic/SDL_sysmutex.c @ 3097:0d12e8f1de3c

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Date: Thu, 05 Feb 2009 18:07:35 +0100 From: Stefan Klug Subject: [SDL] SDL 1.3 WinCE backend as promised, I've started to work on the WinCE backend of SDL 1.3 I've modified the win32 video backend and the gdi renderer, to work properly in WinCE. The results till now are great, but there is still some work to do. Attached are two patches with my changes. I would be happy if someone could review and propably commit them. The first one (configure.in.patch) should be straight forward without any side effects. The second one does the necessary changes to the win32 backend. I was really unhappy to start slicing this shiny new backend with #ifdef/#endif but I saw no other option. The most problematic issues are: - WinCe has no GetDIBits, so its practically impossible to fill a BITMAPINFO with correct values. I therefore removed the bmi member from the GDI_RenderData in SDL_gdirender.c to prevent usage of a not or not properly initialized bmi. - In SDL_win32window.c I exchanged some ASCII function by their general counterparts, (In CE only the Unicode versions are available). I don't know if this has a negative effect when running in win32 Cheers Stefan
author Sam Lantinga <slouken@libsdl.org>
date Mon, 23 Mar 2009 05:35:21 +0000
parents 99210400e8b9
children 0d1b16ee0bca
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
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30 struct SDL_mutex
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31 {
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32 int recursive;
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33 Uint32 owner;
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34 SDL_sem *sem;
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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 *
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39 SDL_CreateMutex(void)
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40 {
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41 SDL_mutex *mutex;
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42
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43 /* Allocate mutex memory */
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44 mutex = (SDL_mutex *) SDL_malloc(sizeof(*mutex));
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45 if (mutex) {
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46 /* Create the mutex semaphore, with initial value 1 */
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47 mutex->sem = SDL_CreateSemaphore(1);
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48 mutex->recursive = 0;
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49 mutex->owner = 0;
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50 if (!mutex->sem) {
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51 SDL_free(mutex);
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52 mutex = NULL;
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53 }
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54 } else {
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55 SDL_OutOfMemory();
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56 }
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57 return mutex;
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58 }
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59
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60 /* Free the mutex */
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61 void
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62 SDL_DestroyMutex(SDL_mutex * mutex)
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63 {
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64 if (mutex) {
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65 if (mutex->sem) {
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66 SDL_DestroySemaphore(mutex->sem);
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67 }
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68 SDL_free(mutex);
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69 }
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70 }
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71
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72 /* Lock the semaphore */
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73 int
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74 SDL_mutexP(SDL_mutex * mutex)
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75 {
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76 #if SDL_THREADS_DISABLED
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77 return 0;
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78 #else
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79 Uint32 this_thread;
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80
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81 if (mutex == NULL) {
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82 SDL_SetError("Passed a NULL mutex");
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83 return -1;
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84 }
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85
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86 this_thread = SDL_ThreadID();
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87 if (mutex->owner == this_thread) {
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88 ++mutex->recursive;
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89 } else {
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90 /* The order of operations is important.
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91 We set the locking thread id after we obtain the lock
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92 so unlocks from other threads will fail.
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93 */
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94 SDL_SemWait(mutex->sem);
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95 mutex->owner = this_thread;
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96 mutex->recursive = 0;
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97 }
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98
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99 return 0;
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100 #endif /* SDL_THREADS_DISABLED */
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101 }
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102
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103 /* Unlock the mutex */
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104 int
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105 SDL_mutexV(SDL_mutex * mutex)
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106 {
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107 #if SDL_THREADS_DISABLED
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108 return 0;
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109 #else
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110 if (mutex == NULL) {
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111 SDL_SetError("Passed a NULL mutex");
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112 return -1;
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113 }
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114
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115 /* If we don't own the mutex, we can't unlock it */
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116 if (SDL_ThreadID() != mutex->owner) {
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117 SDL_SetError("mutex not owned by this thread");
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118 return -1;
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119 }
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120
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121 if (mutex->recursive) {
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122 --mutex->recursive;
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123 } else {
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124 /* The order of operations is important.
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125 First reset the owner so another thread doesn't lock
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126 the mutex and set the ownership before we reset it,
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127 then release the lock semaphore.
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128 */
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129 mutex->owner = 0;
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130 SDL_SemPost(mutex->sem);
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131 }
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132 return 0;
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133 #endif /* SDL_THREADS_DISABLED */
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74212992fb08 Initial revision
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134 }
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c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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135
c121d94672cb SDL 1.2 is moving to a branch, and SDL 1.3 is becoming the head.
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136 /* vi: set ts=4 sw=4 expandtab: */