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annotate docs/html/sdlcreatesemaphore.html @ 834:d37179d10ccc

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author Sam Lantinga <slouken@libsdl.org>
date Mon, 16 Feb 2004 21:15:25 +0000
parents 355632dca928
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_CreateSemaphore</TITLE
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5 ><META
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6 NAME="GENERATOR"
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7 CONTENT="Modular DocBook HTML Stylesheet Version 1.76b+
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8 "><LINK
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9 REL="HOME"
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10 TITLE="SDL Library Documentation"
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11 HREF="index.html"><LINK
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12 REL="UP"
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13 TITLE="Multi-threaded Programming"
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14 HREF="thread.html"><LINK
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15 REL="PREVIOUS"
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16 TITLE="SDL_mutexV"
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17 HREF="sdlmutexv.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_DestroySemaphore"
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20 HREF="sdldestroysemaphore.html"></HEAD
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21 ><BODY
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22 CLASS="REFENTRY"
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23 BGCOLOR="#FFF8DC"
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24 TEXT="#000000"
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25 LINK="#0000ee"
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26 VLINK="#551a8b"
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27 ALINK="#ff0000"
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28 ><DIV
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29 CLASS="NAVHEADER"
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30 ><TABLE
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31 SUMMARY="Header navigation table"
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32 WIDTH="100%"
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33 BORDER="0"
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34 CELLPADDING="0"
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35 CELLSPACING="0"
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36 ><TR
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37 ><TH
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38 COLSPAN="3"
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39 ALIGN="center"
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40 >SDL Library Documentation</TH
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41 ></TR
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42 ><TR
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43 ><TD
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44 WIDTH="10%"
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45 ALIGN="left"
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46 VALIGN="bottom"
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47 ><A
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48 HREF="sdlmutexv.html"
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49 ACCESSKEY="P"
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50 >Prev</A
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51 ></TD
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52 ><TD
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53 WIDTH="80%"
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54 ALIGN="center"
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55 VALIGN="bottom"
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56 ></TD
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57 ><TD
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58 WIDTH="10%"
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59 ALIGN="right"
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60 VALIGN="bottom"
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61 ><A
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62 HREF="sdldestroysemaphore.html"
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63 ACCESSKEY="N"
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64 >Next</A
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65 ></TD
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66 ></TR
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67 ></TABLE
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68 ><HR
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69 ALIGN="LEFT"
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70 WIDTH="100%"></DIV
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71 ><H1
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72 ><A
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73 NAME="SDLCREATESEMAPHORE"
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74 ></A
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75 >SDL_CreateSemaphore</H1
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76 ><DIV
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77 CLASS="REFNAMEDIV"
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78 ><A
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79 NAME="AEN7936"
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80 ></A
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81 ><H2
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82 >Name</H2
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83 >SDL_CreateSemaphore&nbsp;--&nbsp;Creates a new semaphore and assigns an initial value to it.</DIV
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84 ><DIV
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85 CLASS="REFSYNOPSISDIV"
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86 ><A
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87 NAME="AEN7939"
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88 ></A
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89 ><H2
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90 >Synopsis</H2
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91 ><DIV
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92 CLASS="FUNCSYNOPSIS"
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93 ><A
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94 NAME="AEN7940"
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95 ></A
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96 ><P
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97 ></P
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98 ><PRE
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99 CLASS="FUNCSYNOPSISINFO"
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100 >#include "SDL.h"
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101 #include "SDL_thread.h"</PRE
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102 ><P
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103 ><CODE
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104 ><CODE
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105 CLASS="FUNCDEF"
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106 >SDL_sem *<B
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107 CLASS="FSFUNC"
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108 >SDL_CreateSemaphore</B
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109 ></CODE
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110 >(Uint32 initial_value);</CODE
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111 ></P
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112 ><P
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113 ></P
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114 ></DIV
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115 ></DIV
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116 ><DIV
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117 CLASS="REFSECT1"
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118 ><A
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119 NAME="AEN7946"
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120 ></A
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121 ><H2
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122 >Description</H2
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123 ><P
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124 ><TT
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125 CLASS="FUNCTION"
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126 >SDL_CreateSemaphore()</TT
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127 > creates a new semaphore and
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128 initializes it with the value <TT
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129 CLASS="PARAMETER"
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130 ><I
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131 >initial_value</I
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132 ></TT
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133 >.
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134 Each locking operation on the semaphore by
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135 <A
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136 HREF="sdlsemwait.html"
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137 >SDL_SemWait</A
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138 >,
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139 <A
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140 HREF="sdlsemtrywait.html"
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141 >SDL_SemTryWait</A
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142 > or
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143 <A
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144 HREF="sdlsemwaittimeout.html"
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145 >SDL_SemWaitTimeout</A
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146 >
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147 will atomically decrement the semaphore value. The locking operation will be blocked
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148 if the semaphore value is not positive (greater than zero). Each unlock operation by
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149 <A
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150 HREF="sdlsempost.html"
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151 >SDL_SemPost</A
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152 >
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153 will atomically increment the semaphore value.</P
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154 ></DIV
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155 ><DIV
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156 CLASS="REFSECT1"
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157 ><A
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158 NAME="AEN7955"
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159 ></A
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160 ><H2
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161 >Return Value</H2
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162 ><P
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163 >Returns a pointer to an initialized semaphore or
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164 <SPAN
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165 CLASS="RETURNVALUE"
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166 >NULL</SPAN
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167 > if there was an error.</P
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168 ></DIV
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169 ><DIV
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170 CLASS="REFSECT1"
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171 ><A
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172 NAME="AEN7959"
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173 ></A
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174 ><H2
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175 >Examples</H2
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176 ><P
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177 ><PRE
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178 CLASS="PROGRAMLISTING"
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179 >SDL_sem *my_sem;
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180
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181 my_sem = SDL_CreateSemaphore(INITIAL_SEM_VALUE);
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182
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183 if (my_sem == NULL) {
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184 return CREATE_SEM_FAILED;
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185 }</PRE
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186 ></P
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187 ></DIV
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188 ><DIV
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189 CLASS="REFSECT1"
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190 ><A
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191 NAME="AEN7963"
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192 ></A
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193 ><H2
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194 >See Also</H2
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195 ><P
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196 ><A
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197 HREF="sdldestroysemaphore.html"
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198 ><TT
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199 CLASS="FUNCTION"
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200 >SDL_DestroySemaphore</TT
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201 ></A
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202 >,
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203 <A
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204 HREF="sdlsemwait.html"
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205 ><TT
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206 CLASS="FUNCTION"
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207 >SDL_SemWait</TT
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208 ></A
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209 >,
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210 <A
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211 HREF="sdlsemtrywait.html"
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212 ><TT
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213 CLASS="FUNCTION"
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214 >SDL_SemTryWait</TT
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215 ></A
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216 >,
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217 <A
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218 HREF="sdlsemwaittimeout.html"
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219 ><TT
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220 CLASS="FUNCTION"
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221 >SDL_SemWaitTimeout</TT
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222 ></A
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223 >,
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224 <A
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225 HREF="sdlsempost.html"
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226 ><TT
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227 CLASS="FUNCTION"
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228 >SDL_SemPost</TT
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229 ></A
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230 >,
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231 <A
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232 HREF="sdlsemvalue.html"
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233 ><TT
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234 CLASS="FUNCTION"
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235 >SDL_SemValue</TT
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236 ></A
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237 ></P
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238 ></DIV
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239 ><DIV
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240 CLASS="NAVFOOTER"
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241 ><HR
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242 ALIGN="LEFT"
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243 WIDTH="100%"><TABLE
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244 SUMMARY="Footer navigation table"
0
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245 WIDTH="100%"
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246 BORDER="0"
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247 CELLPADDING="0"
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248 CELLSPACING="0"
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249 ><TR
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250 ><TD
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251 WIDTH="33%"
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252 ALIGN="left"
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253 VALIGN="top"
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254 ><A
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255 HREF="sdlmutexv.html"
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256 ACCESSKEY="P"
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257 >Prev</A
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258 ></TD
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259 ><TD
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260 WIDTH="34%"
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261 ALIGN="center"
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262 VALIGN="top"
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263 ><A
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264 HREF="index.html"
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265 ACCESSKEY="H"
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266 >Home</A
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267 ></TD
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268 ><TD
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269 WIDTH="33%"
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270 ALIGN="right"
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271 VALIGN="top"
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272 ><A
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273 HREF="sdldestroysemaphore.html"
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274 ACCESSKEY="N"
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275 >Next</A
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276 ></TD
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277 ></TR
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278 ><TR
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279 ><TD
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280 WIDTH="33%"
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281 ALIGN="left"
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282 VALIGN="top"
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283 >SDL_mutexV</TD
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284 ><TD
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285 WIDTH="34%"
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286 ALIGN="center"
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287 VALIGN="top"
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288 ><A
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289 HREF="thread.html"
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290 ACCESSKEY="U"
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291 >Up</A
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292 ></TD
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293 ><TD
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294 WIDTH="33%"
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295 ALIGN="right"
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296 VALIGN="top"
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297 >SDL_DestroySemaphore</TD
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298 ></TR
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299 ></TABLE
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300 ></DIV
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301 ></BODY
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302 ></HTML
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303 >