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<TITLE>PTHREAD_WIN32_TEST_FEATURES_NP manual page</TITLE>
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<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 STYLE="font-weight: medium">pthread_win32_test_features_np –
find out what features were detected at process attach time.</P>
<H2><A HREF="#toc1" NAME="sect1">Synopsis</A></H2>
<P><B>#include <pthread.h></B>
</P>
<P><B>BOOL pthread_win32_test_features_np(int</B> <I>mask</I><B>);</B></P>
<H2><A HREF="#toc2" NAME="sect2">Description</A></H2>
<P><B>pthread_win32_test_features_np</B> allows an application to
check which run-time auto-detected features are available within the
library.</P>
<P>The possible features are:</P>
<P><B>PTW32_SYSTEM_INTERLOCKED_COMPARE_EXCHANGE</B></P>
<P STYLE="margin-left: 2cm">Return TRUE if the Win32 version of
InterlockedCompareExchange() is being used. On IA32 systems the
library can use optimised and inlinable assembler versions of
InterlockedExchange() and InterlockedCompareExchange().</P>
<P><B>PTW32_ALERTABLE_ASYNC_CANCEL</B></P>
<P STYLE="margin-left: 2cm">Return TRUE if the QueueUserAPCEx package
QUSEREX.DLL and the AlertDrv.sys driver was detected. This package
provides alertable (pre-emptive) asynchronous threads cancellation.
If this feature returns FALSE then the default async cancel scheme
is in use, which cannot cancel blocked threads.</P>
<P>Features may be OR'ed into the mask parameter, in which case the
routine returns TRUE if any of the OR'ed features would
return TRUE. At this stage it doesn't make sense to OR features but
it may some day.</P>
<H2><A HREF="#toc3" NAME="sect3">Cancellation</A></H2>
<P>None.</P>
<H2><A HREF="#toc4" NAME="sect4"><FONT COLOR="#000080">Return Value</FONT></A></H2>
<P><B>pthread_win32_test_features_np</B> returns TRUE (non-zero) if
any of the specified features is present, and FALSE (0) otherwise.</P>
<H2><A HREF="#toc5" NAME="sect5">Errors</A></H2>
<P>None.</P>
<H2><A HREF="#toc6" NAME="sect6">Author</A></H2>
<P>Ross Johnson for use with <A HREF="http://sources.redhat.com/pthreads-win32">Pthreads-w32</A>.</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><A HREF="#sect6" NAME="toc6">Author</A>
</P>
</UL>
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