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annotate src/thread/beos/SDL_syssem.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 f7b03b6838cb
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 /* Semaphores in the BeOS environment */
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25
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26 #include <be/kernel/OS.h>
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27
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28 #include "SDL_thread.h"
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29
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30
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31 struct SDL_semaphore
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32 {
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33 sem_id id;
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34 };
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35
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36 /* Create a counting semaphore */
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37 SDL_sem *
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38 SDL_CreateSemaphore(Uint32 initial_value)
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39 {
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40 SDL_sem *sem;
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41
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42 sem = (SDL_sem *) SDL_malloc(sizeof(*sem));
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43 if (sem) {
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44 sem->id = create_sem(initial_value, "SDL semaphore");
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45 if (sem->id < B_NO_ERROR) {
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46 SDL_SetError("create_sem() failed");
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47 SDL_free(sem);
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48 sem = NULL;
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49 }
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50 } else {
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51 SDL_OutOfMemory();
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52 }
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53 return (sem);
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54 }
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55
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56 /* Free the semaphore */
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57 void
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58 SDL_DestroySemaphore(SDL_sem * sem)
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59 {
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60 if (sem) {
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61 if (sem->id >= B_NO_ERROR) {
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62 delete_sem(sem->id);
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63 }
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64 SDL_free(sem);
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65 }
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66 }
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67
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68 int
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69 SDL_SemWaitTimeout(SDL_sem * sem, Uint32 timeout)
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70 {
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71 int32 val;
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72 int retval;
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73
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74 if (!sem) {
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75 SDL_SetError("Passed a NULL semaphore");
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76 return -1;
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77 }
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78
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79 tryagain:
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80 if (timeout == SDL_MUTEX_MAXWAIT) {
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81 val = acquire_sem(sem->id);
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82 } else {
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83 timeout *= 1000; /* BeOS uses a timeout in microseconds */
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84 val = acquire_sem_etc(sem->id, 1, B_RELATIVE_TIMEOUT, timeout);
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85 }
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86 switch (val) {
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87 case B_INTERRUPTED:
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88 goto tryagain;
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89 case B_NO_ERROR:
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90 retval = 0;
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91 break;
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92 case B_TIMED_OUT:
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93 retval = SDL_MUTEX_TIMEDOUT;
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94 break;
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95 case B_WOULD_BLOCK:
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96 retval = SDL_MUTEX_TIMEDOUT;
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97 break;
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98 default:
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99 SDL_SetError("acquire_sem() failed");
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100 retval = -1;
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101 break;
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102 }
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103
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104 return retval;
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105 }
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106
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107 int
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108 SDL_SemTryWait(SDL_sem * sem)
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109 {
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110 return SDL_SemWaitTimeout(sem, 0);
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111 }
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112
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113 int
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114 SDL_SemWait(SDL_sem * sem)
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115 {
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116 return SDL_SemWaitTimeout(sem, SDL_MUTEX_MAXWAIT);
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117 }
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118
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119 /* Returns the current count of the semaphore */
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120 Uint32
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121 SDL_SemValue(SDL_sem * sem)
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122 {
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123 int32 count;
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124 Uint32 value;
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125
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126 value = 0;
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127 if (sem) {
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128 get_sem_count(sem->id, &count);
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129 if (count > 0) {
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130 value = (Uint32) count;
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131 }
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132 }
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133 return value;
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134 }
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135
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136 /* Atomically increases the semaphore's count (not blocking) */
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137 int
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138 SDL_SemPost(SDL_sem * sem)
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139 {
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140 if (!sem) {
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141 SDL_SetError("Passed a NULL semaphore");
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142 return -1;
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143 }
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144
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145 if (release_sem(sem->id) != B_NO_ERROR) {
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146 SDL_SetError("release_sem() failed");
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147 return -1;
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148 }
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149 return 0;
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150 }
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151
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152 /* vi: set ts=4 sw=4 expandtab: */