-<?xml version="1.0" encoding="UTF-8" standalone="no"?>
-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
-<html xmlns="http://www.w3.org/1999/xhtml"><head><title>Implementation</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"/><meta name="keywords" content=" ISO C++ , allocator "/><meta name="keywords" content=" ISO C++ , library "/><meta name="keywords" content=" ISO C++ , runtime , library "/><link rel="home" href="../index.html" title="The GNU C++ Library"/><link rel="up" href="mt_allocator.html" title="Chapter 20. The mt_allocator"/><link rel="prev" href="bk01pt03ch20s02.html" title="Design Issues"/><link rel="next" href="bk01pt03ch20s04.html" title="Single Thread Example"/></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Implementation</th></tr><tr><td align="left"><a accesskey="p" href="bk01pt03ch20s02.html">Prev</a> </td><th width="60%" align="center">Chapter 20. The mt_allocator</th><td align="right"> <a accesskey="n" href="bk01pt03ch20s04.html">Next</a></td></tr></table><hr/></div><div class="section" title="Implementation"><div class="titlepage"><div><div><h2 class="title"><a id="allocator.mt.impl"/>Implementation</h2></div></div></div><div class="section" title="Tunable Parameters"><div class="titlepage"><div><div><h3 class="title"><a id="allocator.mt.tune"/>Tunable Parameters</h3></div></div></div><p>Certain allocation parameters can be modified, or tuned. There
+<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"><title>Implementation</title><meta name="generator" content="DocBook XSL-NS Stylesheets V1.76.1"><meta name="keywords" content="
+ ISO C++
+ ,
+ allocator
+ "><meta name="keywords" content="
+ ISO C++
+ ,
+ library
+ "><meta name="keywords" content="
+ ISO C++
+ ,
+ runtime
+ ,
+ library
+ "><link rel="home" href="../index.html" title="The GNU C++ Library"><link rel="up" href="mt_allocator.html" title="Chapter 20. The mt_allocator"><link rel="prev" href="bk01pt03ch20s02.html" title="Design Issues"><link rel="next" href="bk01pt03ch20s04.html" title="Single Thread Example"></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Implementation</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="bk01pt03ch20s02.html">Prev</a> </td><th width="60%" align="center">Chapter 20. The mt_allocator</th><td width="20%" align="right"> <a accesskey="n" href="bk01pt03ch20s04.html">Next</a></td></tr></table><hr></div><div class="section" title="Implementation"><div class="titlepage"><div><div><h2 class="title" style="clear: both"><a name="allocator.mt.impl"></a>Implementation</h2></div></div></div><div class="section" title="Tunable Parameters"><div class="titlepage"><div><div><h3 class="title"><a name="allocator.mt.tune"></a>Tunable Parameters</h3></div></div></div><p>Certain allocation parameters can be modified, or tuned. There
exists a nested <code class="code">struct __pool_base::_Tune</code> that contains all
these parameters, which include settings for
-</p><div class="itemizedlist"><ul class="itemizedlist"><li class="listitem"><p>Alignment</p></li><li class="listitem"><p>Maximum bytes before calling <code class="code">::operator new</code> directly</p></li><li class="listitem"><p>Minimum bytes</p></li><li class="listitem"><p>Size of underlying global allocations</p></li><li class="listitem"><p>Maximum number of supported threads</p></li><li class="listitem"><p>Migration of deallocations to the global free list</p></li><li class="listitem"><p>Shunt for global <code class="code">new</code> and <code class="code">delete</code></p></li></ul></div><p>Adjusting parameters for a given instance of an allocator can only
+</p><div class="itemizedlist"><ul class="itemizedlist"
type="disc"><li class="listitem"><p>Alignment</p></li><li class="listitem"><p>Maximum bytes before calling <code class="code">::operator new</code> directly</p></li><li class="listitem"><p>Minimum bytes</p></li><li class="listitem"><p>Size of underlying global allocations</p></li><li class="listitem"><p>Maximum number of supported threads</p></li><li class="listitem"><p>Migration of deallocations to the global free list</p></li><li class="listitem"><p>Shunt for global <code class="code">new</code> and <code class="code">delete</code></p></li></ul></div><p>Adjusting parameters for a given instance of an allocator can only
happen before any allocations take place, when the allocator itself is
initialized. For instance:
</p><pre class="programlisting">
return 0;
}
-</pre></div><div class="section" title="Initialization"><div class="titlepage"><div><div><h3 class="title"><a
id="allocator.mt.init"/>Initialization</h3></div></div></div><p>
+</pre></div><div class="section" title="Initialization"><div class="titlepage"><div><div><h3 class="title"><a
name="allocator.mt.init"></a>Initialization</h3></div></div></div><p>
The static variables (pointers to freelists, tuning parameters etc)
are initialized as above, or are set to the global defaults.
</p><p>
for this specific bin. This only occurs when a number of blocks
are grabbed from the global list to a thread specific list or when
a thread decides to return some blocks to the global freelist.
-</p></div><div class="section" title="Deallocation Notes"><div class="titlepage"><div><div><h3 class="title"><a
id="allocator.mt.deallocation"/>Deallocation Notes</h3></div></div></div><p> Notes about deallocation. This allocator does not explicitly
+</p></div><div class="section" title="Deallocation Notes"><div class="titlepage"><div><div><h3 class="title"><a
name="allocator.mt.deallocation"></a>Deallocation Notes</h3></div></div></div><p> Notes about deallocation. This allocator does not explicitly
release memory. Because of this, memory debugging programs like
valgrind or purify may notice leaks: sorry about this
inconvenience. Operating systems will reclaim allocated memory at
as part of a container's constructor. However, this assumption is
implementation-specific, and subject to change. For an example of a
pool that frees memory, see the following
- <a class="link" href="http://gcc.gnu.org/viewcvs/trunk/libstdc++-v3/testsuite/ext/mt_allocator/deallocate_local-6.cc?view=markup">
+ <a class="link" href="http://gcc.gnu.org/viewcvs/trunk/libstdc++-v3/testsuite/ext/mt_allocator/deallocate_local-6.cc?view=markup" target="_top">
example.</a>
-</p></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td align="left"><a accesskey="p" href="bk01pt03ch20s02.html">Prev</a> </td><td align="center"><a accesskey="u" href="mt_allocator.html">Up</a></td><td align="right"> <a accesskey="n" href="bk01pt03ch20s04.html">Next</a></td></tr><tr><td align="left" valign="top">Design Issues </td><td align="center"><a accesskey="h" href="../index.html">Home</a></td><td align="right" valign="top"> Single Thread Example</td></tr></table></div></body></html>
+</p></div></div><div class="navfooter"><hr><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="bk01pt03ch20s02.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="mt_allocator.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="bk01pt03ch20s04.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Design Issues </td><td width="20%" align="center"><a accesskey="h" href="../index.html">Home</a></td><td width="40%" align="right" valign="top"> Single Thread Example</td></tr></table></div></body></html>
projects / gcc.git / blobdiff