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annotate docs/html/sdlsemtrywait.html @ 4041:1c291c47cf1e SDL-1.2

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Updated SVN checkout instructions
author Sam Lantinga <slouken@libsdl.org>
date Tue, 10 Jul 2007 20:15:31 +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_SemTryWait</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_SemWait"
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17 HREF="sdlsemwait.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_SemWaitTimeout"
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20 HREF="sdlsemwaittimeout.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="sdlsemwait.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="sdlsemwaittimeout.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="SDLSEMTRYWAIT"
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74 ></A
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75 >SDL_SemTryWait</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="AEN8069"
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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_SemTryWait&nbsp;--&nbsp;Attempt to lock a semaphore but don't suspend the thread.</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="AEN8072"
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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="AEN8073"
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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_SemTryWait</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="AEN8079"
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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_SemTryWait</TT
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127 > is a non-blocking varient of
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128 <A
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129 HREF="sdlsemwait.html"
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130 ><TT
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131 CLASS="FUNCTION"
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132 >SDL_SemWait</TT
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133 ></A
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134 >. If the value of the semaphore
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135 pointed to by <TT
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136 CLASS="PARAMETER"
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137 ><I
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138 >sem</I
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139 ></TT
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140 > is positive it will atomically
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141 decrement the semaphore value and return 0, otherwise it will return
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142 <SPAN
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143 CLASS="RETURNVALUE"
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144 >SDL_MUTEX_TIMEDOUT</SPAN
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145 > instead of suspending the thread.</P
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146 ><P
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147 >After <TT
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148 CLASS="FUNCTION"
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149 >SDL_SemTryWait</TT
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150 > is successful, the semaphore
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151 can be released and its count atomically incremented by a successful call to
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152 <A
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153 HREF="sdlsempost.html"
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154 >SDL_SemPost</A
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155 >.</P
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156 ></DIV
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157 ><DIV
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158 CLASS="REFSECT1"
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159 ><A
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160 NAME="AEN8090"
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161 ></A
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162 ><H2
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163 >Return Value</H2
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164 ><P
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165 >Returns <SPAN
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166 CLASS="RETURNVALUE"
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167 >0</SPAN
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168 > if the semaphore was successfully locked or
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169 either <SPAN
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170 CLASS="RETURNVALUE"
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171 >SDL_MUTEX_TIMEDOUT</SPAN
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172 > or <SPAN
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173 CLASS="RETURNVALUE"
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174 >-1</SPAN
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175 >
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176 if the thread would have suspended or there was an error, respectivly.</P
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177 ><P
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178 >If the semaphore was not successfully locked, the semaphore will be unchanged.</P
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179 ></DIV
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180 ><DIV
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181 CLASS="REFSECT1"
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182 ><A
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183 NAME="AEN8097"
0
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184 ></A
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185 ><H2
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186 >Examples</H2
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187 ><P
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188 ><PRE
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189 CLASS="PROGRAMLISTING"
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190 >res = SDL_SemTryWait(my_sem);
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191
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192 if (res == SDL_MUTEX_TIMEDOUT) {
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193 return TRY_AGAIN;
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194 }
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195 if (res == -1) {
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196 return WAIT_ERROR;
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197 }
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198
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199 ...
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200
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201 SDL_SemPost(my_sem);</PRE
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202 ></P
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203 ></DIV
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204 ><DIV
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205 CLASS="REFSECT1"
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206 ><A
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207 NAME="AEN8101"
0
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208 ></A
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209 ><H2
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210 >See Also</H2
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211 ><P
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212 ><A
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213 HREF="sdlcreatesemaphore.html"
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214 ><TT
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215 CLASS="FUNCTION"
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216 >SDL_CreateSemaphore</TT
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217 ></A
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218 >,
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219 <A
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220 HREF="sdldestroysemaphore.html"
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221 ><TT
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222 CLASS="FUNCTION"
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223 >SDL_DestroySemaphore</TT
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224 ></A
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225 >,
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226 <A
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227 HREF="sdlsemwait.html"
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228 ><TT
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229 CLASS="FUNCTION"
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230 >SDL_SemWait</TT
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231 ></A
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232 >,
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233 <A
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234 HREF="sdlsemwaittimeout.html"
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235 ><TT
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236 CLASS="FUNCTION"
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237 >SDL_SemWaitTimeout</TT
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238 ></A
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239 >,
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240 <A
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241 HREF="sdlsempost.html"
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242 ><TT
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243 CLASS="FUNCTION"
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244 >SDL_SemPost</TT
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245 ></A
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246 >,
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247 <A
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248 HREF="sdlsemvalue.html"
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249 ><TT
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250 CLASS="FUNCTION"
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251 >SDL_SemValue</TT
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252 ></A
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253 ></P
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254 ></DIV
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255 ><DIV
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256 CLASS="NAVFOOTER"
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257 ><HR
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258 ALIGN="LEFT"
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259 WIDTH="100%"><TABLE
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260 SUMMARY="Footer navigation table"
0
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261 WIDTH="100%"
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262 BORDER="0"
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263 CELLPADDING="0"
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264 CELLSPACING="0"
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265 ><TR
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266 ><TD
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267 WIDTH="33%"
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268 ALIGN="left"
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269 VALIGN="top"
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270 ><A
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271 HREF="sdlsemwait.html"
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272 ACCESSKEY="P"
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273 >Prev</A
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274 ></TD
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275 ><TD
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276 WIDTH="34%"
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277 ALIGN="center"
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278 VALIGN="top"
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279 ><A
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280 HREF="index.html"
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281 ACCESSKEY="H"
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282 >Home</A
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283 ></TD
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284 ><TD
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285 WIDTH="33%"
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286 ALIGN="right"
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287 VALIGN="top"
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288 ><A
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289 HREF="sdlsemwaittimeout.html"
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290 ACCESSKEY="N"
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291 >Next</A
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292 ></TD
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293 ></TR
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294 ><TR
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295 ><TD
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296 WIDTH="33%"
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297 ALIGN="left"
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298 VALIGN="top"
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299 >SDL_SemWait</TD
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300 ><TD
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301 WIDTH="34%"
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302 ALIGN="center"
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303 VALIGN="top"
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304 ><A
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305 HREF="thread.html"
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306 ACCESSKEY="U"
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307 >Up</A
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308 ></TD
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309 ><TD
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310 WIDTH="33%"
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311 ALIGN="right"
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312 VALIGN="top"
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313 >SDL_SemWaitTimeout</TD
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314 ></TR
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315 ></TABLE
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316 ></DIV
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317 ></BODY
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318 ></HTML
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319 >