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1 <HTML
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2 ><HEAD
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3 ><TITLE
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4 >SDL_DestroySemaphore</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 1.61
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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_CreateSemaphore"
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17 HREF="sdlcreatesemaphore.html"><LINK
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18 REL="NEXT"
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19 TITLE="SDL_SemWait"
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20 HREF="sdlsemwait.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 WIDTH="100%"
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32 BORDER="0"
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33 CELLPADDING="0"
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34 CELLSPACING="0"
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35 ><TR
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36 ><TH
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37 COLSPAN="3"
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38 ALIGN="center"
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39 >SDL Library Documentation</TH
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40 ></TR
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41 ><TR
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42 ><TD
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43 WIDTH="10%"
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44 ALIGN="left"
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45 VALIGN="bottom"
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46 ><A
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47 HREF="sdlcreatesemaphore.html"
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48 >Prev</A
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49 ></TD
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50 ><TD
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51 WIDTH="80%"
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52 ALIGN="center"
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53 VALIGN="bottom"
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54 ></TD
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55 ><TD
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56 WIDTH="10%"
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57 ALIGN="right"
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58 VALIGN="bottom"
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59 ><A
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60 HREF="sdlsemwait.html"
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61 >Next</A
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62 ></TD
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63 ></TR
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64 ></TABLE
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65 ><HR
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66 ALIGN="LEFT"
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67 WIDTH="100%"></DIV
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68 ><H1
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69 ><A
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70 NAME="SDLDESTROYSEMAPHORE"
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71 >SDL_DestroySemaphore</A
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72 ></H1
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73 ><DIV
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74 CLASS="REFNAMEDIV"
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75 ><A
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76 NAME="AEN7357"
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77 ></A
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78 ><H2
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79 >Name</H2
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80 >SDL_DestroySemaphore -- Destroys a semaphore that was created by <A
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81 HREF="sdlcreatesemaphore.html"
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82 >SDL_CreateSemaphore</A
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83 >.</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="AEN7361"
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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="AEN7362"
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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 >void <B
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107 CLASS="FSFUNC"
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108 >SDL_DestroySemaphore</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="AEN7368"
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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_DestroySemaphore</TT
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127 > destroys the semaphore pointed to
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128 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 > that was created by
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134 <A
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135 HREF="sdlcreatesemaphore.html"
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136 ><TT
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137 CLASS="FUNCTION"
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138 >SDL_CreateSemaphore</TT
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139 ></A
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140 >.
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141 It is not safe to destroy a semaphore if there are threads currently blocked
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142 waiting on it.</P
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143 ></DIV
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144 ><DIV
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145 CLASS="REFSECT1"
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146 ><A
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147 NAME="AEN7375"
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148 ></A
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149 ><H2
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150 >Examples</H2
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151 ><P
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152 ><PRE
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153 CLASS="PROGRAMLISTING"
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154 >if (my_sem != NULL) {
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155 SDL_DestroySemaphore(my_sem);
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156 my_sem = NULL;
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157 }</PRE
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158 ></P
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159 ></DIV
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160 ><DIV
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161 CLASS="REFSECT1"
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162 ><A
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163 NAME="AEN7379"
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164 ></A
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165 ><H2
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166 >See Also</H2
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167 ><P
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168 ><A
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169 HREF="sdlcreatesemaphore.html"
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170 ><TT
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171 CLASS="FUNCTION"
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172 >SDL_CreateSemaphore</TT
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173 ></A
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174 >,
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175 <A
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176 HREF="sdlsemwait.html"
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177 ><TT
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178 CLASS="FUNCTION"
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179 >SDL_SemWait</TT
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180 ></A
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181 >,
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182 <A
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183 HREF="sdlsemtrywait.html"
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184 ><TT
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185 CLASS="FUNCTION"
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186 >SDL_SemTryWait</TT
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187 ></A
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188 >,
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189 <A
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190 HREF="sdlsemwaittimeout.html"
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191 ><TT
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192 CLASS="FUNCTION"
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193 >SDL_SemWaitTimeout</TT
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194 ></A
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195 >,
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196 <A
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197 HREF="sdlsempost.html"
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198 ><TT
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199 CLASS="FUNCTION"
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200 >SDL_SemPost</TT
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201 ></A
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202 >,
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203 <A
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204 HREF="sdlsemvalue.html"
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205 ><TT
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206 CLASS="FUNCTION"
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207 >SDL_SemValue</TT
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208 ></A
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209 ></P
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210 ></DIV
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211 ><DIV
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212 CLASS="NAVFOOTER"
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213 ><HR
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214 ALIGN="LEFT"
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219 CELLSPACING="0"
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220 ><TR
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221 ><TD
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222 WIDTH="33%"
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223 ALIGN="left"
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224 VALIGN="top"
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225 ><A
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226 HREF="sdlcreatesemaphore.html"
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227 >Prev</A
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228 ></TD
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229 ><TD
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230 WIDTH="34%"
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231 ALIGN="center"
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232 VALIGN="top"
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233 ><A
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234 HREF="index.html"
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235 >Home</A
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236 ></TD
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237 ><TD
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238 WIDTH="33%"
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239 ALIGN="right"
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240 VALIGN="top"
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241 ><A
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242 HREF="sdlsemwait.html"
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243 >Next</A
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244 ></TD
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245 ></TR
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246 ><TR
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247 ><TD
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248 WIDTH="33%"
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249 ALIGN="left"
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250 VALIGN="top"
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251 >SDL_CreateSemaphore</TD
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252 ><TD
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253 WIDTH="34%"
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254 ALIGN="center"
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255 VALIGN="top"
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256 ><A
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257 HREF="thread.html"
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258 >Up</A
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261 WIDTH="33%"
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262 ALIGN="right"
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263 VALIGN="top"
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264 >SDL_SemWait</TD
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265 ></TR
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