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<title>15.1.1 Concurrency support for libraries </title>
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<a name="1204978"> </a><font color="#003366" face="Verdana, Arial, Helvetica, sans-serif">15.1.1 Concurrency support for libraries</font>
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<a name="1204979"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Some ANSI functions are non-reentrant. This means that in a multi-threaded environment they must be used carefully. The following functions are non-reentrant:</font>
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<a name="1213340"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif"><font size=2 face=Courier><strong>atexit</strong></font>, <font size=2 face=Courier><strong>asctime</strong></font>, <font size=2 face=Courier><strong>ctime</strong></font>, <font size=2 face=Courier><strong>localtime</strong></font>, <font size=2 face=Courier><strong>rand</strong></font>, <font size=2 face=Courier><strong>signal</strong></font>, <font size=2 face=Courier><strong>srand</strong></font>, <font size=2 face=Courier><strong>strtok</strong></font>.</font>
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<a name="1213341"> </a><font size=2 face="Verdana, Arial, Helvetica, sans-serif">Use of OS20 (either with or without the <strong>st20cc</strong> option <font face="Verdana, Arial, Helvetica, sans-serif"><b>runtime</b></font> <font size=2 face=Courier><strong>os20</strong></font>) provides support for the following:</font>
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<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205000"> </a>the heap functions: <font size=2 face=Courier><strong>calloc</strong></font>, <font size=2 face=Courier><strong>free</strong></font>, <font size=2 face=Courier><strong>malloc</strong></font>, <font size=2 face=Courier><strong>realloc</strong></font>,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205001"> </a>all <font size=2 face=Courier><strong>stdio</strong></font> functions including <font size=2 face=Courier><strong>printf</strong></font>,</font></p>
<p> <font size=2 face="Verdana, Arial, Helvetica, sans-serif"><li ><a name="1205005"> </a>all device independent I/O functions described in <a href="posix.htm#1206311"><font color="#0000ff" face="Verdana, Arial, Helvetica, sans-serif"><i>Chapter⌨️ 快捷键说明
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