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diff --git a/share/doc/gdb/Thread_002dSpecific-Breakpoints.html b/share/doc/gdb/Thread_002dSpecific-Breakpoints.html new file mode 100644 index 0000000..ddbc7bf --- /dev/null +++ b/share/doc/gdb/Thread_002dSpecific-Breakpoints.html @@ -0,0 +1,135 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Free Software" and "Free Software Needs +Free Documentation", with the Front-Cover Texts being "A GNU Manual," +and with the Back-Cover Texts as in (a) below. + +(a) The FSF's Back-Cover Text is: "You are free to copy and modify +this GNU Manual. Buying copies from GNU Press supports the FSF in +developing GNU and promoting software freedom." --> +<!-- Created by GNU Texinfo 5.1, http://www.gnu.org/software/texinfo/ --> +<head> +<title>Debugging with GDB: Thread-Specific Breakpoints</title> + +<meta name="description" content="Debugging with GDB: Thread-Specific Breakpoints"> +<meta name="keywords" content="Debugging with GDB: Thread-Specific Breakpoints"> +<meta name="resource-type" content="document"> +<meta name="distribution" content="global"> +<meta name="Generator" content="makeinfo"> +<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> +<link href="index.html#Top" rel="start" title="Top"> +<link href="Concept-Index.html#Concept-Index" rel="index" title="Concept Index"> +<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> +<link href="Thread-Stops.html#Thread-Stops" rel="up" title="Thread Stops"> +<link href="Interrupted-System-Calls.html#Interrupted-System-Calls" rel="next" title="Interrupted System Calls"> +<link href="Background-Execution.html#Background-Execution" rel="previous" title="Background Execution"> +<style type="text/css"> +<!-- +a.summary-letter {text-decoration: none} +blockquote.smallquotation {font-size: smaller} +div.display {margin-left: 3.2em} +div.example {margin-left: 3.2em} +div.indentedblock {margin-left: 3.2em} +div.lisp {margin-left: 3.2em} +div.smalldisplay {margin-left: 3.2em} +div.smallexample {margin-left: 3.2em} +div.smallindentedblock {margin-left: 3.2em; font-size: smaller} +div.smalllisp {margin-left: 3.2em} +kbd {font-style:oblique} +pre.display {font-family: inherit} +pre.format {font-family: inherit} +pre.menu-comment {font-family: serif} +pre.menu-preformatted {font-family: serif} +pre.smalldisplay {font-family: inherit; font-size: smaller} +pre.smallexample {font-size: smaller} +pre.smallformat {font-family: inherit; font-size: smaller} +pre.smalllisp {font-size: smaller} +span.nocodebreak {white-space:nowrap} +span.nolinebreak {white-space:nowrap} +span.roman {font-family:serif; font-weight:normal} +span.sansserif {font-family:sans-serif; font-weight:normal} +ul.no-bullet {list-style: none} +--> +</style> + + +</head> + +<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> +<a name="Thread_002dSpecific-Breakpoints"></a> +<div class="header"> +<p> +Next: <a href="Interrupted-System-Calls.html#Interrupted-System-Calls" accesskey="n" rel="next">Interrupted System Calls</a>, Previous: <a href="Background-Execution.html#Background-Execution" accesskey="p" rel="previous">Background Execution</a>, Up: <a href="Thread-Stops.html#Thread-Stops" accesskey="u" rel="up">Thread Stops</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> +</div> +<hr> +<a name="Thread_002dSpecific-Breakpoints-1"></a> +<h4 class="subsection">5.5.4 Thread-Specific Breakpoints</h4> + +<p>When your program has multiple threads (see <a href="Threads.html#Threads">Debugging +Programs with Multiple Threads</a>), you can choose whether to set +breakpoints on all threads, or on a particular thread. +</p> +<dl compact="compact"> +<dd><a name="index-breakpoints-and-threads"></a> +<a name="index-thread-breakpoints"></a> +<a name="index-break-_2026-thread-thread_002did"></a> +</dd> +<dt><code>break <var>locspec</var> thread <var>thread-id</var></code></dt> +<dt><code>break <var>locspec</var> thread <var>thread-id</var> if …</code></dt> +<dd><p><var>locspec</var> specifies a code location or locations in your program. +See <a href="Location-Specifications.html#Location-Specifications">Location Specifications</a>, for details. +</p> +<p>Use the qualifier ‘<samp>thread <var>thread-id</var></samp>’ with a breakpoint command +to specify that you only want <small>GDB</small> to stop the program when a +particular thread reaches this breakpoint. The <var>thread-id</var> specifier +is one of the thread identifiers assigned by <small>GDB</small>, shown +in the first column of the ‘<samp>info threads</samp>’ display. +</p> +<p>If you do not specify ‘<samp>thread <var>thread-id</var></samp>’ when you set a +breakpoint, the breakpoint applies to <em>all</em> threads of your +program. +</p> +<p>You can use the <code>thread</code> qualifier on conditional breakpoints as +well; in this case, place ‘<samp>thread <var>thread-id</var></samp>’ before or +after the breakpoint condition, like this: +</p> +<div class="smallexample"> +<pre class="smallexample">(gdb) break frik.c:13 thread 28 if bartab > lim +</pre></div> + +</dd> +</dl> + +<p>Thread-specific breakpoints are automatically deleted when +<small>GDB</small> detects the corresponding thread is no longer in the +thread list. For example: +</p> +<div class="smallexample"> +<pre class="smallexample">(gdb) c +Thread-specific breakpoint 3 deleted - thread 28 no longer in the thread list. +</pre></div> + +<p>There are several ways for a thread to disappear, such as a regular +thread exit, but also when you detach from the process with the +<code>detach</code> command (see <a href="Attach.html#Attach">Debugging an Already-running +Process</a>), or if <small>GDB</small> loses the remote connection +(see <a href="Remote-Debugging.html#Remote-Debugging">Remote Debugging</a>), etc. Note that with some targets, +<small>GDB</small> is only able to detect a thread has exited when the user +explictly asks for the thread list with the <code>info threads</code> +command. +</p> +<hr> +<div class="header"> +<p> +Next: <a href="Interrupted-System-Calls.html#Interrupted-System-Calls" accesskey="n" rel="next">Interrupted System Calls</a>, Previous: <a href="Background-Execution.html#Background-Execution" accesskey="p" rel="previous">Background Execution</a>, Up: <a href="Thread-Stops.html#Thread-Stops" accesskey="u" rel="up">Thread Stops</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p> +</div> + + + +</body> +</html> |