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| author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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| committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
| commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
| tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /pthreads/manual/pthread_kill.html | |
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Diffstat (limited to 'pthreads/manual/pthread_kill.html')
| -rw-r--r-- | pthreads/manual/pthread_kill.html | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/pthreads/manual/pthread_kill.html b/pthreads/manual/pthread_kill.html new file mode 100644 index 000000000..33d61b21c --- /dev/null +++ b/pthreads/manual/pthread_kill.html @@ -0,0 +1,152 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> +<HTML> +<HEAD> + <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=utf-8"> + <TITLE>PTHREAD_SIGNAL(3) manual page</TITLE> + <META NAME="GENERATOR" CONTENT="OpenOffice.org 1.1.3 (Linux)"> + <META NAME="CREATED" CONTENT="20050504;18500100"> + <META NAME="CHANGED" CONTENT="20050504;23005800"> + <!-- manual page source format generated by PolyglotMan v3.2, --> + <!-- available at http://polyglotman.sourceforge.net/ --> +</HEAD> +<BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR"> +<H4>POSIX Threads for Windows – REFERENCE - <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A></H4> +<P><A HREF="index.html">Reference Index</A></P> +<P><A HREF="#toc">Table of Contents</A></P> +<H2><A HREF="#toc0" NAME="sect0">Name</A></H2> +<P>pthread_sigmask, pthread_kill, sigwait - handling of signals in +threads +</P> +<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2> +<P><B>#include <pthread.h></B> <BR><B>#include <signal.h></B> +</P> +<P><B>int pthread_sigmask(int </B><I>how</I><B>, const sigset_t +*</B><I>newmask</I><B>, sigset_t *</B><I>oldmask</I><B>);</B> +</P> +<P><B>int pthread_kill(pthread_t </B><I>thread</I><B>, int </B><I>signo</I><B>);</B> +</P> +<P><B>int sigwait(const sigset_t *</B>set, <B>int</B> *sig);</P> +<H2><A HREF="#toc2" NAME="sect2">Description</A></H2> +<P><B>pthread_sigmask</B> changes the signal mask for the calling +thread as described by the <I>how</I> and <I>newmask</I> arguments. +If <I>oldmask</I> is not <B>NULL</B>, the previous signal mask is +stored in the location pointed to by <I>oldmask</I>. <B>Pthreads-w32</B> +implements this function but no other function uses the signal mask +yet.</P> +<P>The meaning of the <I>how</I> and <I>newmask</I> arguments is the +same as for <B><SPAN STYLE="font-style: normal">sigprocmask</SPAN></B>(2). +If <I>how</I> is <B>SIG_SETMASK</B>, the signal mask is set to +<I>newmask</I>. If <I>how</I> is <B>SIG_BLOCK</B>, the signals +specified to <I>newmask</I> are added to the current signal mask. If +<I>how</I> is <B>SIG_UNBLOCK</B>, the signals specified to <I>newmask</I> +are removed from the current signal mask. +</P> +<P>Recall that signal masks are set on a per-thread basis, but signal +actions and signal handlers, as set with <B>sigaction</B>(2), are +shared between all threads. +</P> +<P><B>pthread_kill</B> send signal number <I>signo</I> to the thread +<I>thread</I>. <B>Pthreads-w32</B> only supports signal number 0, +which does not send any signal but causes <B>pthread_kill</B> to +return an error if <I>thread</I> is not valid.</P> +<P><B>sigwait</B> suspends the calling thread until one of the +signals in <I>set</I> is delivered to the calling thread. It then +stores the number of the signal received in the location pointed to +by <I>sig</I> and returns. The signals in <I>set</I> must be blocked +and not ignored on entrance to <B>sigwait</B>. If the delivered +signal has a signal handler function attached, that function is <I>not</I> +called. <B>Pthreads-w32</B> implements this function as a +cancellation point only - it does not wait for any signals and does +not change the location pointed to by <I>sig</I>.</P> +<H2><A HREF="#toc3" NAME="sect3">Cancellation</A></H2> +<P><B>sigwait</B> is a cancellation point. +</P> +<H2><A HREF="#toc4" NAME="sect4">Return Value</A></H2> +<P>On success, 0 is returned. On failure, a non-zero error code is +returned. +</P> +<H2><A HREF="#toc5" NAME="sect5">Errors</A></H2> +<P>The <B>pthread_sigmask</B> function returns the following error +codes on error: +</P> +<DL> + <DL> + <DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>EINVAL</B> + </DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> + <I>how</I> is not one of <B>SIG_SETMASK</B>, <B>SIG_BLOCK</B>, or + <B>SIG_UNBLOCK</B> + </DD></DL> +</DL> +<P> +The <B>pthread_kill</B> function returns the following error codes on +error: +</P> +<DL> + <DL> + <DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"><B>EINVAL</B> + </DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> + <I>signo</I> is not a valid signal number or is unsupported.</DD><DT STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> + <B>ESRCH</B> + </DT><DD STYLE="margin-right: 1cm; margin-bottom: 0.5cm"> + the thread <I>thread</I> does not exist (e.g. it has already + terminated) + </DD></DL> +</DL> +<P> +The <B>sigwait</B> function never returns an error. +</P> +<H2><A HREF="#toc6" NAME="sect6">Author</A></H2> +<P>Xavier Leroy <Xavier.Leroy@inria.fr> +</P> +<P>Modified by Ross Johnson for use with <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A>.</P> +<H2><A HREF="#toc7" NAME="sect7">See Also</A></H2> +<P> +</P> +<H2><A HREF="#toc8" NAME="sect8">Notes</A></H2> +<P>In any implementation, for <B>sigwait</B> to work reliably, the +signals being waited for must be blocked in all threads, not only in +the calling thread, since otherwise the POSIX semantics for signal +delivery do not guarantee that it’s the thread doing the <B>sigwait</B> +that will receive the signal. The best way to achieve this is to +block those signals before any threads are created, and never unblock +them in the program other than by calling <B>sigwait</B>. This works +because all threads inherit their initial sigmask from their creating +thread.</P> +<H2><A HREF="#toc9" NAME="sect9">Bugs</A></H2> +<P><B>Pthreads-w32</B> does not implement signals yet and so these +routines have almost no use except to prevent the compiler or linker +from complaining. <B>pthread_kill</B> is useful in determining if the +thread is a valid thread, but since many threads implementations +reuse thread IDs, the valid thread may no longer be the thread you +think it is, and so this method of determining thread validity is not +portable, and very risky. <B>Pthreads-w32</B> from version 1.0.0 +onwards implements pseudo-unique thread IDs, so applications that use +this technique (but really shouldn't) have some protection.</P> +<HR> +<P><A NAME="toc"></A><B>Table of Contents</B></P> +<UL> + <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect0" NAME="toc0">Name</A> + </P> + <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect1" NAME="toc1">Synopsis</A> + </P> + <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect2" NAME="toc2">Description</A> + </P> + <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect3" NAME="toc3">Cancellation</A> + </P> + <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">Return + Value</A> + </P> + <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">Errors</A> + </P> + <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect6" NAME="toc6">Author</A> + </P> + <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect7" NAME="toc7">See + Also</A> + </P> + <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect8" NAME="toc8">Notes</A> + </P> + <LI><P><A HREF="#sect9" NAME="toc9">Bugs</A> + </P> +</UL> +</BODY> +</HTML> |