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annotate src/thread/amigaos/SDL_syssem.c @ 1662:782fd950bd46 SDL-1.3

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Revamp of the video system in progress - adding support for multiple displays, multiple windows, and a full video mode selection API. WARNING: None of the video drivers have been updated for the new API yet! The API is still under design and very fluid. The code is now run through a consistent indent format: indent -i4 -nut -nsc -br -ce The headers are being converted to automatically generate doxygen documentation.
author Sam Lantinga <slouken@libsdl.org>
date Sun, 28 May 2006 13:04:16 +0000
parents d910939febfa
children 4da1ee79c9af
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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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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 semaphores using mutexes and condition variables */
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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_semaphore
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31 {
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32 struct SignalSemaphore Sem;
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33 };
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34
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35 #undef D
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36
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37 #define D(x)
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38
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39 SDL_sem *
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40 SDL_CreateSemaphore (Uint32 initial_value)
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41 {
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42 SDL_sem *sem;
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43
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44 sem = (SDL_sem *) SDL_malloc (sizeof (*sem));
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45
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46 if (!sem) {
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47 SDL_OutOfMemory ();
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48 return (0);
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49 }
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50
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51 D (bug ("Creating semaphore %lx...\n", sem));
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52
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53 SDL_memset (sem, 0, sizeof (*sem));
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54
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55 InitSemaphore (&sem->Sem);
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56
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57 return (sem);
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58 }
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59
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60 void
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61 SDL_DestroySemaphore (SDL_sem * sem)
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62 {
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63 D (bug ("Destroying semaphore %lx...\n", sem));
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64
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65 if (sem) {
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66 // Condizioni per liberare i task in attesa?
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67 SDL_free (sem);
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68 }
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69 }
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70
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71 int
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72 SDL_SemTryWait (SDL_sem * sem)
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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 D (bug ("TryWait semaphore...%lx\n", sem));
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80
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81 ObtainSemaphore (&sem->Sem);
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82 // ReleaseSemaphore(&sem->Sem);
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83
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84 return 1;
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85 }
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86
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87 int
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88 SDL_SemWaitTimeout (SDL_sem * sem, Uint32 timeout)
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89 {
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90 int retval;
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91
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92
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93 if (!sem) {
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94 SDL_SetError ("Passed a NULL semaphore");
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95 return -1;
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96 }
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97
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98 D (bug ("WaitTimeout (%ld) semaphore...%lx\n", timeout, sem));
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99
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100 /* A timeout of 0 is an easy case */
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101 if (timeout == 0) {
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102 ObtainSemaphore (&sem->Sem);
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103 return 1;
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104 }
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105 if (!(retval = AttemptSemaphore (&sem->Sem))) {
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106 SDL_Delay (timeout);
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107 retval = AttemptSemaphore (&sem->Sem);
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108 }
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109
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110 if (retval == TRUE) {
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111 // ReleaseSemaphore(&sem->Sem);
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112 retval = 1;
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113 }
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114
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115 return retval;
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116 }
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117
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118 int
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119 SDL_SemWait (SDL_sem * sem)
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120 {
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121 ObtainSemaphore (&sem->Sem);
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122 return 0;
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123 }
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124
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125 Uint32
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126 SDL_SemValue (SDL_sem * sem)
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127 {
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128 Uint32 value;
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129
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130 value = 0;
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131 if (sem) {
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132 #ifdef STORMC4_WOS
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133 value = sem->Sem.ssppc_SS.ss_NestCount;
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134 #else
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135 value = sem->Sem.ss_NestCount;
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136 #endif
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137 }
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138 return value;
0
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139 }
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140
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141 int
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142 SDL_SemPost (SDL_sem * sem)
0
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143 {
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144 if (!sem) {
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145 SDL_SetError ("Passed a NULL semaphore");
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146 return -1;
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147 }
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148 D (bug ("SemPost semaphore...%lx\n", sem));
0
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149
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150 ReleaseSemaphore (&sem->Sem);
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151 return 0;
0
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152 }
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153
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154 /* vi: set ts=4 sw=4 expandtab: */