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<title>pcre_assign_jit_stack specification</title>
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<h1>pcre_assign_jit_stack man page</h1>
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<br>
<br><b>
SYNOPSIS
</b><br>
<P>
<b>#include <pcre.h></b>
</P>
<P>
<b>void pcre_assign_jit_stack(pcre_extra *<i>extra</i>,</b>
<b>pcre_jit_callback <i>callback</i>, void *<i>data</i>);</b>
</P>
<P>
<b>void pcre16_assign_jit_stack(pcre16_extra *<i>extra</i>,</b>
<b>pcre16_jit_callback <i>callback</i>, void *<i>data</i>);</b>
</P>
<P>
<b>void pcre32_assign_jit_stack(pcre32_extra *<i>extra</i>,</b>
<b>pcre32_jit_callback <i>callback</i>, void *<i>data</i>);</b>
</P>
<br><b>
DESCRIPTION
</b><br>
<P>
This function provides control over the memory used as a stack at run-time by a
call to <b>pcre[16|32]_exec()</b> with a pattern that has been successfully
compiled with JIT optimization. The arguments are:
<pre>
extra the data pointer returned by <b>pcre[16|32]_study()</b>
callback a callback function
data a JIT stack or a value to be passed to the callback
function
</PRE>
</P>
<P>
If <i>callback</i> is NULL and <i>data</i> is NULL, an internal 32K block on
the machine stack is used.
</P>
<P>
If <i>callback</i> is NULL and <i>data</i> is not NULL, <i>data</i> must
be a valid JIT stack, the result of calling <b>pcre[16|32]_jit_stack_alloc()</b>.
</P>
<P>
If <i>callback</i> not NULL, it is called with <i>data</i> as an argument at
the start of matching, in order to set up a JIT stack. If the result is NULL,
the internal 32K stack is used; otherwise the return value must be a valid JIT
stack, the result of calling <b>pcre[16|32]_jit_stack_alloc()</b>.
</P>
<P>
You may safely assign the same JIT stack to multiple patterns, as long as they
are all matched in the same thread. In a multithread application, each thread
must use its own JIT stack. For more details, see the
<a href="pcrejit.html"><b>pcrejit</b></a>
page.
</P>
<P>
There is a complete description of the PCRE native API in the
<a href="pcreapi.html"><b>pcreapi</b></a>
page and a description of the POSIX API in the
<a href="pcreposix.html"><b>pcreposix</b></a>
page.
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