diff options
| author | marha <marha@users.sourceforge.net> | 2013-02-13 10:41:10 +0100 |
|---|---|---|
| committer | marha <marha@users.sourceforge.net> | 2013-02-13 10:41:10 +0100 |
| commit | b41f74438672dd682bc01ae818cb3da654f22c1e (patch) | |
| tree | 07674ef1368a5427a75080528d8cee74234f6b28 /pthreads/manual/sched_setaffinity.html | |
| parent | aaf21968deb85b635cb6aa6544df233ea5981346 (diff) | |
| download | vcxsrv-b41f74438672dd682bc01ae818cb3da654f22c1e.tar.gz vcxsrv-b41f74438672dd682bc01ae818cb3da654f22c1e.tar.bz2 vcxsrv-b41f74438672dd682bc01ae818cb3da654f22c1e.zip | |
Updated to latest CVS version of pthreads
Diffstat (limited to 'pthreads/manual/sched_setaffinity.html')
| -rwxr-xr-x | pthreads/manual/sched_setaffinity.html | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/pthreads/manual/sched_setaffinity.html b/pthreads/manual/sched_setaffinity.html new file mode 100755 index 000000000..ec7ef7e0e --- /dev/null +++ b/pthreads/manual/sched_setaffinity.html @@ -0,0 +1,143 @@ +<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
+<HTML>
+<HEAD>
+ <META HTTP-EQUIV="CONTENT-TYPE" CONTENT="text/html; charset=windows-1252">
+ <TITLE>PTHREAD_CREATE(3) manual page</TITLE>
+ <META NAME="GENERATOR" CONTENT="OpenOffice.org 3.4 (Win32)">
+ <META NAME="CREATED" CONTENT="20050504;19394700">
+ <META NAME="CHANGED" CONTENT="20120921;10513422">
+ <STYLE TYPE="text/css">
+ <!--
+ H4.cjk { font-family: "SimSun" }
+ H4.ctl { font-family: "Mangal" }
+ H2.cjk { font-family: "SimSun" }
+ H2.ctl { font-family: "Mangal" }
+ -->
+ </STYLE>
+</HEAD>
+<BODY LANG="en-GB" BGCOLOR="#ffffff" DIR="LTR">
+<H4 CLASS="western"><FONT FACE="Times New Roman, serif"><FONT SIZE=3><SPAN STYLE="font-style: normal">POSIX
+Threads for Windows – REFERENCE - <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A></SPAN></FONT></FONT></H4>
+<P><A HREF="index.html">Reference Index</A></P>
+<P><A HREF="#toc">Table of Contents</A></P>
+<H2 CLASS="western"><A HREF="#toc0" NAME="sect0">Name</A></H2>
+<P>sched_setaffinity - set process CPU affinity</P>
+<P>sched_getaffinity - get process CPU affinity</P>
+<H2 CLASS="western"><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
+<P><B>#include <sched.h> </B>
+</P>
+<P><B>int sched_setaffinity(pid_t </B><I><SPAN STYLE="font-weight: normal">pid</SPAN></I><B>,
+int </B><I><SPAN STYLE="font-weight: normal">cpusetsize</SPAN></I><B>,
+const cpu_set_t *</B><I><SPAN STYLE="font-weight: normal">mask</SPAN></I><B>);</B></P>
+<P><B>int sched_getaffinity(pid_t </B><I><SPAN STYLE="font-weight: normal">pid</SPAN></I><B>,
+int </B><I><SPAN STYLE="font-weight: normal">cpusetsize</SPAN></I><B>,
+cpu_set_t *</B><I><SPAN STYLE="font-weight: normal">mask</SPAN></I><B>);</B></P>
+<H2 CLASS="western"><A HREF="#toc2" NAME="sect2">Description</A></H2>
+<P><B>sched_setaffinity</B> sets the CPU affinity mask of the process
+whose ID is <I>pid</I> to the value specified by mask. If <I>pid</I>
+is zero, then the calling process is used. The argument <I>cpusetsize</I>
+is the length (in bytes) of the data pointed to by <I>mask</I>.
+Normally this argument would be specified as <I>sizeof(cpu_set_t)</I>.</P>
+<P>If the process specified by <I>pid</I> is not currently running on
+one of the CPUs specified in <I>mask</I>, then that process is
+migrated to one of the CPUs specified in <I>mask</I>.</P>
+<P>After a call to <B>sched_setaffinity</B>, the set of CPUs on which
+the process will actually run is the intersection of the set
+specified in the <I>mask</I> argument and the set of CPUs actually
+present on the system.</P>
+<P><B>sched_getaffinity</B> writes the affinity mask of the process
+whose ID is <I>pid</I> into the cpu_set_t structure pointed to by
+<I>mask</I>. The <I>cpusetsize</I> argument specifies the size (in
+bytes) of <I>mask</I>. If <I>pid</I> is zero, then the mask of the
+calling process is returned.</P>
+<P><B>Pthreads-w32</B> currently ignores the <I>cpusetsize</I>
+parameter for either function because cpu_set_t is a direct typeset
+to the Windows affinity vector type DWORD_PTR.</P>
+<P>Windows may require that the requesting process have permission to
+set its own CPU affinity or that of another process.</P>
+<H2 CLASS="western"><A HREF="#toc3" NAME="sect3">Return Value</A></H2>
+<P>On success, <B>sched_setaffinity</B> and <B>sched_getaffinity</B>
+return 0. On error, -1 is returned, and <I>errno</I> is set
+appropriately.</P>
+<H2 CLASS="western"><A HREF="#toc4" NAME="sect4">Errors</A></H2>
+<DL>
+ <DT><B>EFAULT</B></DT><DL>
+ <DL>
+ <DT STYLE="margin-left: 0.02cm">
+ A supplied memory address was invalid.</DT></DL>
+ </DL>
+ <DT>
+ <B>EINVAL</B></DT><DL>
+ <DL>
+ <DT STYLE="margin-left: 0.04cm">
+ The affinity bit mask mask contains no processors that are
+ currently physically on the system.</DT></DL>
+ </DL>
+ <DT>
+ <B>EAGAIN</B></DT><DL>
+ <DL>
+ <DT STYLE="margin-left: 0.02cm">
+ The function did not succeed in changing or obtaining the CPU
+ affinity for some undetermined reason. Try again.</DT></DL>
+ </DL>
+ <DT>
+ <B>EPERM</B></DT><DL>
+ <DL>
+ <DT STYLE="margin-left: 0.02cm">
+ The calling process does not have appropriate privileges.</DT></DL>
+ </DL>
+ <DT>
+ <B>ESRCH</B>
+ </DT><DL>
+ <DL>
+ <DT STYLE="margin-left: 0.02cm">
+ The process whose ID is pid could not be found.</DT></DL>
+ </DL>
+</DL>
+<H2 CLASS="western">
+<A HREF="#toc5" NAME="sect5">Application Usage</A></H2>
+<P>A process's CPU affinity mask determines the set of CPUs on which
+it is eligible to run. On a multiprocessor system, setting the CPU
+affinity mask can be used to obtain performance benefits. For
+example, by dedicating one CPU to a particular process (i.e., setting
+the affinity mask of that process to specify a single CPU, and
+setting the affinity mask of all other processes to exclude that
+CPU), it is possible to ensure maximum execution speed for that
+process. Restricting a process to run on a single CPU also avoids the
+performance cost caused by the cache invalidation that occurs when a
+process ceases to execute on one CPU and then recommences execution
+on a different CPU.</P>
+<P>A CPU affinity mask is represented by the cpu_set_t structure, a
+"CPU set", pointed to by <I>mask</I>. A set of macros for
+manipulating CPU sets is described in <B>cpu_set</B>(3).</P>
+<H2 CLASS="western"><A HREF="#toc6" NAME="sect6">See Also</A></H2>
+<P><A HREF="cpu_set.html"><B>cpu_set</B>(3)</A>,
+<A HREF="pthread_setaffinity_np.html"><B>pthread_setaffininty_np</B>(3)</A>,
+<A HREF="pthread_setaffinity_np.html"><B>pthread_getaffinity_np</B>(3)</A></P>
+<H2 CLASS="western"><A HREF="#toc7" NAME="sect7">Copyright</A></H2>
+<P>Most of this is taken from the Linux manual page.</P>
+<P>Modified by Ross Johnson for use with <B>Pthreads-w32</B>.</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">Return
+ Value</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect4" NAME="toc4">Errors</A>
+ </P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect5" NAME="toc5">Application
+ Usage</A></P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect6" NAME="toc6">See
+ Also</A></P>
+ <LI><P STYLE="margin-bottom: 0cm"><A HREF="#sect7" NAME="toc7">Copyright</A></P>
+</UL>
+<H4 CLASS="western"><BR><BR>
+</H4>
+</BODY>
+</HTML>
\ No newline at end of file |