133 lines
8.3 KiB
HTML
133 lines
8.3 KiB
HTML
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<!DOCTYPE html>
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<html>
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<!-- Created by GNU Texinfo 7.1, https://www.gnu.org/software/texinfo/ -->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<!-- This manual documents Guile version 3.0.10.
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Copyright (C) 1996-1997, 2000-2005, 2009-2023 Free Software Foundation,
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Inc.
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Copyright (C) 2021 Maxime Devos
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Copyright (C) 2024 Tomas Volf
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with no
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Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A
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copy of the license is included in the section entitled "GNU Free
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Documentation License." -->
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<title>Blocking (Guile Reference Manual)</title>
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<meta name="description" content="Blocking (Guile Reference Manual)">
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<meta name="keywords" content="Blocking (Guile Reference Manual)">
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<meta name="viewport" content="width=device-width,initial-scale=1">
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<link href="index.html" rel="start" title="Top">
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<link href="Concept-Index.html" rel="index" title="Concept Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Scheduling.html" rel="up" title="Scheduling">
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<link href="Futures.html" rel="next" title="Futures">
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<link href="Mutexes-and-Condition-Variables.html" rel="prev" title="Mutexes and Condition Variables">
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<style type="text/css">
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<link rel="stylesheet" type="text/css" href="https://www.gnu.org/software/gnulib/manual.css">
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</head>
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<body lang="en">
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<div class="subsection-level-extent" id="Blocking">
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<div class="nav-panel">
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<p>
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Next: <a href="Futures.html" accesskey="n" rel="next">Futures</a>, Previous: <a href="Mutexes-and-Condition-Variables.html" accesskey="p" rel="prev">Mutexes and Condition Variables</a>, Up: <a href="Scheduling.html" accesskey="u" rel="up">Threads, Mutexes, Asyncs and Dynamic Roots</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<h4 class="subsection" id="Blocking-in-Guile-Mode"><span>6.22.6 Blocking in Guile Mode<a class="copiable-link" href="#Blocking-in-Guile-Mode"> ¶</a></span></h4>
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<p>Up to Guile version 1.8, a thread blocked in guile mode would prevent
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the garbage collector from running. Thus threads had to explicitly
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leave guile mode with <code class="code">scm_without_guile ()</code> before making a
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potentially blocking call such as a mutex lock, a <code class="code">select ()</code>
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system call, etc. The following functions could be used to temporarily
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leave guile mode or to perform some common blocking operations in a
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supported way.
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</p>
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<p>Starting from Guile 2.0, blocked threads no longer hinder garbage
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collection. Thus, the functions below are not needed anymore. They can
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still be used to inform the GC that a thread is about to block, giving
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it a (small) optimization opportunity for “stop the world” garbage
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collections, should they occur while the thread is blocked.
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</p>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_005fwithout_005fguile"><span class="category-def">C Function: </span><span><code class="def-type">void *</code> <strong class="def-name">scm_without_guile</strong> <code class="def-code-arguments">(void *(*func) (void *), void *data)</code><a class="copiable-link" href="#index-scm_005fwithout_005fguile"> ¶</a></span></dt>
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<dd><p>Leave guile mode, call <var class="var">func</var> on <var class="var">data</var>, enter guile mode and
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return the result of calling <var class="var">func</var>.
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</p>
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<p>While a thread has left guile mode, it must not call any libguile
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functions except <code class="code">scm_with_guile</code> or <code class="code">scm_without_guile</code> and
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must not use any libguile macros. Also, local variables of type
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<code class="code">SCM</code> that are allocated while not in guile mode are not
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protected from the garbage collector.
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</p>
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<p>When used from non-guile mode, calling <code class="code">scm_without_guile</code> is
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still allowed: it simply calls <var class="var">func</var>. In that way, you can leave
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guile mode without having to know whether the current thread is in
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guile mode or not.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_005fpthread_005fmutex_005flock"><span class="category-def">C Function: </span><span><code class="def-type">int</code> <strong class="def-name">scm_pthread_mutex_lock</strong> <code class="def-code-arguments">(pthread_mutex_t *mutex)</code><a class="copiable-link" href="#index-scm_005fpthread_005fmutex_005flock"> ¶</a></span></dt>
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<dd><p>Like <code class="code">pthread_mutex_lock</code>, but leaves guile mode while waiting for
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the mutex.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_005fpthread_005fcond_005fwait"><span class="category-def">C Function: </span><span><code class="def-type">int</code> <strong class="def-name">scm_pthread_cond_wait</strong> <code class="def-code-arguments">(pthread_cond_t *cond, pthread_mutex_t *mutex)</code><a class="copiable-link" href="#index-scm_005fpthread_005fcond_005fwait"> ¶</a></span></dt>
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<dt class="deftypefnx def-cmd-deftypefn" id="index-scm_005fpthread_005fcond_005ftimedwait"><span class="category-def">C Function: </span><span><code class="def-type">int</code> <strong class="def-name">scm_pthread_cond_timedwait</strong> <code class="def-code-arguments">(pthread_cond_t *cond, pthread_mutex_t *mutex, struct timespec *abstime)</code><a class="copiable-link" href="#index-scm_005fpthread_005fcond_005ftimedwait"> ¶</a></span></dt>
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<dd><p>Like <code class="code">pthread_cond_wait</code> and <code class="code">pthread_cond_timedwait</code>, but
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leaves guile mode while waiting for the condition variable.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_005fstd_005fselect"><span class="category-def">C Function: </span><span><code class="def-type">int</code> <strong class="def-name">scm_std_select</strong> <code class="def-code-arguments">(int nfds, fd_set *readfds, fd_set *writefds, fd_set *exceptfds, struct timeval *timeout)</code><a class="copiable-link" href="#index-scm_005fstd_005fselect"> ¶</a></span></dt>
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<dd><p>Like <code class="code">select</code> but leaves guile mode while waiting. Also, the
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delivery of an async causes this function to be interrupted with error
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code <code class="code">EINTR</code>.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_005fstd_005fsleep"><span class="category-def">C Function: </span><span><code class="def-type">unsigned int</code> <strong class="def-name">scm_std_sleep</strong> <code class="def-code-arguments">(unsigned int seconds)</code><a class="copiable-link" href="#index-scm_005fstd_005fsleep"> ¶</a></span></dt>
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<dd><p>Like <code class="code">sleep</code>, but leaves guile mode while sleeping. Also, the
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delivery of an async causes this function to be interrupted.
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</p></dd></dl>
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<dl class="first-deftypefn">
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<dt class="deftypefn" id="index-scm_005fstd_005fusleep"><span class="category-def">C Function: </span><span><code class="def-type">unsigned long</code> <strong class="def-name">scm_std_usleep</strong> <code class="def-code-arguments">(unsigned long usecs)</code><a class="copiable-link" href="#index-scm_005fstd_005fusleep"> ¶</a></span></dt>
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<dd><p>Like <code class="code">usleep</code>, but leaves guile mode while sleeping. Also, the
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delivery of an async causes this function to be interrupted.
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</p></dd></dl>
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</div>
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<hr>
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<div class="nav-panel">
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<p>
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Next: <a href="Futures.html">Futures</a>, Previous: <a href="Mutexes-and-Condition-Variables.html">Mutexes and Condition Variables</a>, Up: <a href="Scheduling.html">Threads, Mutexes, Asyncs and Dynamic Roots</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html" title="Index" rel="index">Index</a>]</p>
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</div>
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</body>
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</html>
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