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94 lines
4.0 KiB
HTML
94 lines
4.0 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This manual documents how to install and use the Multiple Precision
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Floating-Point Reliable Library, version 3.1.4.
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Copyright 1991, 1993-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document under
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the terms of the GNU Free Documentation License, Version 1.2 or any later
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version published by the Free Software Foundation; with no Invariant Sections,
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with no Front-Cover Texts, and with no Back-Cover Texts. A copy of the
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license is included in GNU Free Documentation License. -->
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Memory Handling (GNU MPFR 3.1.4)</title>
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<meta name="description" content="How to install and use GNU MPFR, a library for reliable multiple precision
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floating-point arithmetic, version 3.1.4.">
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<meta name="keywords" content="Memory Handling (GNU MPFR 3.1.4)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index">
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<link href="MPFR-Basics.html#MPFR-Basics" rel="up" title="MPFR Basics">
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<link href="MPFR-Interface.html#MPFR-Interface" rel="next" title="MPFR Interface">
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<link href="Exceptions.html#Exceptions" rel="prev" title="Exceptions">
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-->
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</style>
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</head>
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<body lang="en">
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<a name="Memory-Handling"></a>
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<div class="header">
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<p>
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Previous: <a href="Exceptions.html#Exceptions" accesskey="p" rel="prev">Exceptions</a>, Up: <a href="MPFR-Basics.html#MPFR-Basics" accesskey="u" rel="up">MPFR Basics</a> [<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Memory-Handling-1"></a>
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<h3 class="section">4.7 Memory Handling</h3>
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<p>MPFR functions may create caches, e.g., when computing constants such
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as <em>Pi</em>, either because the user has called a function like
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<code>mpfr_const_pi</code> directly or because such a function was called
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internally by the MPFR library itself to compute some other function.
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</p>
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<p>At any time, the user can free the various caches with
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<code>mpfr_free_cache</code>. It is strongly advised to do that before
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terminating a thread, or before exiting when using tools like
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‘<samp>valgrind</samp>’ (to avoid memory leaks being reported).
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</p>
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<p>MPFR internal data such as flags, the exponent range, the default
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precision and rounding mode, and caches (i.e., data that are not
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accessed via parameters) are either global (if MPFR has not been
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compiled as thread safe) or per-thread (thread local storage, TLS).
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The initial values of TLS data after a thread is created entirely
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depend on the compiler and thread implementation (MPFR simply does
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a conventional variable initialization, the variables being declared
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with an implementation-defined TLS specifier).
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</p>
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</body>
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</html>
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