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annotate docs/html/sdlsemwait.html @ 2995:b3f23a4b4547

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Added more info for precise waiting in SDL_WaitEvent()
author Sam Lantinga <slouken@libsdl.org>
date Sun, 04 Jan 2009 19:36:55 +0000
parents 355632dca928
children
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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_SemWait</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_DestroySemaphore"
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17 HREF="sdldestroysemaphore.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_SemTryWait"
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20 HREF="sdlsemtrywait.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"
0
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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="sdldestroysemaphore.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="sdlsemtrywait.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="SDLSEMWAIT"
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74 ></A
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75 >SDL_SemWait</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="AEN8023"
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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_SemWait&nbsp;--&nbsp;Lock a semaphore and suspend the thread if the semaphore value is zero.</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="AEN8026"
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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="AEN8027"
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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 >int <B
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107 CLASS="FSFUNC"
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108 >SDL_SemWait</B
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109 ></CODE
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110 >(SDL_sem *sem);</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="AEN8033"
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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_SemWait()</TT
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127 > suspends the calling thread until either
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128 the semaphore pointed to by <TT
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129 CLASS="PARAMETER"
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130 ><I
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131 >sem</I
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132 ></TT
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133 > has a positive value,
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134 the call is interrupted by a signal or error. If the call is successful it
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135 will atomically decrement the semaphore value.</P
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136 ><P
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137 >After <TT
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138 CLASS="FUNCTION"
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139 >SDL_SemWait()</TT
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140 > is successful, the semaphore
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141 can be released and its count atomically incremented by a successful call to
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142 <A
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143 HREF="sdlsempost.html"
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144 >SDL_SemPost</A
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145 >.</P
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146 ></DIV
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147 ><DIV
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148 CLASS="REFSECT1"
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149 ><A
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150 NAME="AEN8041"
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151 ></A
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152 ><H2
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153 >Return Value</H2
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154 ><P
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155 >Returns <SPAN
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156 CLASS="RETURNVALUE"
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157 >0</SPAN
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158 > if successful or
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159 <SPAN
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160 CLASS="RETURNVALUE"
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161 >-1</SPAN
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162 > if there was an error (leaving the semaphore unchanged).</P
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163 ></DIV
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164 ><DIV
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165 CLASS="REFSECT1"
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166 ><A
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167 NAME="AEN8046"
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168 ></A
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169 ><H2
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170 >Examples</H2
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171 ><P
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172 ><PRE
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173 CLASS="PROGRAMLISTING"
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174 >if (SDL_SemWait(my_sem) == -1) {
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175 return WAIT_FAILED;
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176 }
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177
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178 ...
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179
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180 SDL_SemPost(my_sem);</PRE
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181 ></P
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182 ></DIV
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183 ><DIV
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184 CLASS="REFSECT1"
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185 ><A
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186 NAME="AEN8050"
0
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187 ></A
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188 ><H2
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189 >See Also</H2
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190 ><P
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191 ><A
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192 HREF="sdlcreatesemaphore.html"
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193 ><TT
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194 CLASS="FUNCTION"
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195 >SDL_CreateSemaphore</TT
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196 ></A
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197 >,
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198 <A
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199 HREF="sdldestroysemaphore.html"
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200 ><TT
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201 CLASS="FUNCTION"
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202 >SDL_DestroySemaphore</TT
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203 ></A
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204 >,
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205 <A
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206 HREF="sdlsemtrywait.html"
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207 ><TT
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208 CLASS="FUNCTION"
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209 >SDL_SemTryWait</TT
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210 ></A
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211 >,
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212 <A
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213 HREF="sdlsemwaittimeout.html"
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214 ><TT
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215 CLASS="FUNCTION"
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216 >SDL_SemWaitTimeout</TT
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217 ></A
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218 >,
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219 <A
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220 HREF="sdlsempost.html"
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221 ><TT
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222 CLASS="FUNCTION"
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223 >SDL_SemPost</TT
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224 ></A
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225 >,
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226 <A
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227 HREF="sdlsemvalue.html"
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228 ><TT
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229 CLASS="FUNCTION"
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230 >SDL_SemValue</TT
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231 ></A
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232 ></P
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233 ></DIV
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234 ><DIV
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235 CLASS="NAVFOOTER"
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236 ><HR
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237 ALIGN="LEFT"
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238 WIDTH="100%"><TABLE
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239 SUMMARY="Footer navigation table"
0
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240 WIDTH="100%"
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241 BORDER="0"
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242 CELLPADDING="0"
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243 CELLSPACING="0"
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244 ><TR
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245 ><TD
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246 WIDTH="33%"
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247 ALIGN="left"
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248 VALIGN="top"
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249 ><A
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250 HREF="sdldestroysemaphore.html"
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251 ACCESSKEY="P"
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252 >Prev</A
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253 ></TD
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254 ><TD
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255 WIDTH="34%"
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256 ALIGN="center"
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257 VALIGN="top"
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258 ><A
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259 HREF="index.html"
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260 ACCESSKEY="H"
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261 >Home</A
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262 ></TD
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263 ><TD
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264 WIDTH="33%"
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265 ALIGN="right"
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266 VALIGN="top"
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267 ><A
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268 HREF="sdlsemtrywait.html"
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269 ACCESSKEY="N"
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270 >Next</A
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271 ></TD
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272 ></TR
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273 ><TR
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274 ><TD
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275 WIDTH="33%"
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276 ALIGN="left"
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277 VALIGN="top"
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278 >SDL_DestroySemaphore</TD
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279 ><TD
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280 WIDTH="34%"
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281 ALIGN="center"
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282 VALIGN="top"
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283 ><A
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284 HREF="thread.html"
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285 ACCESSKEY="U"
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286 >Up</A
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287 ></TD
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288 ><TD
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289 WIDTH="33%"
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290 ALIGN="right"
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291 VALIGN="top"
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292 >SDL_SemTryWait</TD
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293 ></TR
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294 ></TABLE
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295 ></DIV
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296 ></BODY
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297 ></HTML
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298 >