1018 lines
23 KiB
HTML
1018 lines
23 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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<HTML>
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<HEAD>
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<TITLE>Linux Threads Home Page: How do Linux Threads compare with other OSs'?</TITLE>
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<META NAME="GENERATOR" CONTENT="Mozilla/3.0Gold (WinNT; U) [Netscape]">
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</HEAD>
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<BODY background="GraySea.gif">
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<P><FONT SIZE=+3>How do Linux Threads compare with other OSs'?</FONT></P>
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<CENTER><TABLE BORDER=1 CELLSPACING=0 CELLPADDING=2 >
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<TR>
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<TD><B><FONT SIZE=+1>Feature</FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1>Posix</FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1>Solaris</FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1>Win32</FONT></B></TD>
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<TD ALIGN=CENTER COLSPAN="13"><B><FONT SIZE=+1>Linux</FONT></B></TD>
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</TR>
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<TR>
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<TD></TD>
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<TD></TD>
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<TD></TD>
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<TD></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1>Kernel</FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#Bare_Bones">BB</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#CLthreads">CL</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#DCEthreads">DCE</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#FSU_Pthreads">FSU</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#JKthread">JK</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#LinuxThreads">Lt</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#LWP">LWP</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#NThreads">Nt</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#PCthreads">PCt</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#Pthreads">Pt</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#QuickThreads">Qt</A></FONT></B></TD>
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<TD ALIGN=CENTER><B><FONT SIZE=+1><A HREF="ThreadLibs.html#RexThreads">Rex</A></FONT></B></TD>
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</TR>
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<TR>
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<TD><A HREF="Types.html">User-/Kernel-space</A></TD>
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<TD ALIGN=CENTER>n/a</TD>
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<TD ALIGN=CENTER>K&U</TD>
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<TD ALIGN=CENTER>K</TD>
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<TD ALIGN=CENTER>K</TD>
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<TD ALIGN=CENTER>K</TD>
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<TD ALIGN=CENTER>K</TD>
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<TD ALIGN=CENTER>?</TD>
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<TD ALIGN=CENTER>U</TD>
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<TD ALIGN=CENTER>K</TD>
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<TD ALIGN=CENTER>K</TD>
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<TD ALIGN=CENTER>U</TD>
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<TD ALIGN=CENTER>U</TD>
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<TD ALIGN=CENTER>U</TD>
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<TD ALIGN=CENTER>U</TD>
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<TD ALIGN=CENTER>U</TD>
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<TD ALIGN=CENTER>U</TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Cancellation">Cancellation</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Priority_Scheduling">Priority Scheduling</A>
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<A HREF="#NOTE_Linux_Scheduling">[1]</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Priority_Inversion_Handling">Priority Inversion
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Handling</A> <A HREF="#NOTE_Priority_Inversion">[2]</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>?</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Mutex_Attributes">Mutex Attributes</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>?</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Shared_Private_Mutexes">Shared and Private
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Mutexes</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>?</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Thread_Attributes">Thread Attributes</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Synchronization">Synchronization</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Stack_Size_Control">Stack Size Control</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="file:///D|/DATA/Personal/webpages/Linux-Threads/CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Base_Address_Control">Base Address Control</A>
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<A HREF="#NOTE_Solaris">[3]</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>n/a</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Detached_Threads">Detached Threads</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="file:///D|/DATA/Personal/webpages/Linux-Threads/CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Joinable_Threads">Joinable Threads</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER></TD>
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<TD ALIGN=CENTER>-</TD>
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<TD ALIGN=CENTER></TD>
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</TR>
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<TR>
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<TD><A HREF="Dictionary.html#Per_thread_Data_Handling_Function">Per-Thread
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Data Handling Functions</A></TD>
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<TD><A HREF="Dictionary.html#Per_thread_Signal_Handling">Per-Thread Signal
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Handling</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11><A HREF="#NOTE_Signal_Handlers">[4]</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11><A HREF="#NOTE_SIGIO">[8]</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11><A HREF="#NOTE_Signal_Handlers">[4]</A></TD>
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<TD><A HREF="Dictionary.html#DEF_Semaphores">Semaphores</A></TD>
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<TD><A HREF="Dictionary.html#DEF_Thread_ID_Comparison">Thread ID Comparison</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11><A HREF="#NOTE_nthread_self">[9]</A></TD>
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<TD><A HREF="Dictionary.html#DEF_Call_Once_Functions">Call-Once Functions</A></TD>
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<TR>
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<TD><A HREF="Dictionary.html#DEF_Thread_Suspension">Thread Suspension</A>
|
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<A HREF="#NOTE_No_Suspend_Resume">[5]</A></TD>
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<TR>
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<TD><A HREF="Dictionary.html#DEF_Specifying_Concurrency">Specifying Concurrency</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11><A HREF="#NOTE_Multiprocessors">[6]</A></TD>
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<TD ALIGN=CENTER><IMG SRC="CheckMark.gif" ALT="X" HEIGHT=11 WIDTH=11><A HREF="#NOTE_Num_threads">[10]</A></TD>
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<TR>
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<TD><A HREF="Dictionary.html#DEF_Readers_Writer_Locking">Readers/Writer
|
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Share Locking</A> <A HREF="#NOTE_Solaris">[3]</A></TD>
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<TR>
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<TD><A HREF="Dictionary.html#DEF_Processor_specific_Thread_Allocation">Processor-specific
|
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Thread Allocation</A></TD>
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<TR>
|
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<TD><A HREF="Dictionary.html#DEF_Fork_All_Threads">Fork All Threads</A>
|
|
<A HREF="#NOTE_Win32_fork">[7]</A></TD>
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<TD ALIGN=CENTER>-</TD>
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<TR>
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<TD><A HREF="Dictionary.html#DEF_Fork_Calling_Thread_Only">Fork Calling
|
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Thread Only</A> <A HREF="#NOTE_Win32_fork">[7]</A></TD>
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</TABLE></CENTER>
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<P>NOTES:</P>
|
|
|
|
<OL>
|
|
<LI><A NAME="NOTE_Linux_Scheduling"></A>Linux kernel-space threads are
|
|
processes and are not handled differently from fork'ed tasks (unlike most
|
|
other multithreaded OS's). Therefore, process scheduling, cancelling, suspending,
|
|
etc. is controlled via signals.</LI>
|
|
|
|
<LI><A NAME="NOTE_Priority_Inversion"></A>Posix and Solaris link thread
|
|
priorities with mutexes and use the priority of a blocked thread's mutex
|
|
to alter the priority of the blocking thread. Win32 and Linux let the scheduler
|
|
determine what thread to elevate in priority.</LI>
|
|
|
|
<LI><A NAME="NOTE_Solaris"></A>Solaris strangeness. Not applicable to most
|
|
other OS's.</LI>
|
|
|
|
<LI><A NAME="NOTE_Signal_Handlers"></A>Signals are received on a per-thread
|
|
basis, but threads share signal handlers for a given signal.</LI>
|
|
|
|
<LI><A NAME="NOTE_No_Suspend_Resume"></A>Posix specifies no functionality
|
|
for suspending and resuming threads. Solaris implements it because they
|
|
need it: the program can change certain thread's attributes unless it is
|
|
suspended.</LI>
|
|
|
|
<LI><A NAME="NOTE_Multiprocessors"></A>Multiprocessor systems only.</LI>
|
|
|
|
<LI><A NAME="NOTE_Win32_fork"></A>Win32 has no direct equivalent to unix's
|
|
fork() system call, but you can fake it with the CreateProcess() and CreateRemoteProcess()
|
|
calls [and a little luck].</LI>
|
|
|
|
<LI><A NAME="NOTE_SIGIO"></A>SIGIO and SIGALARM are multiplexed.</LI>
|
|
|
|
<LI><A NAME="NOTE_nthread_self"></A>There is a function "nthread_self()"
|
|
to get the ID of the calling thread.</LI>
|
|
|
|
<LI><A NAME="NOTE_Num_threads"></A>You can specify how much user-level
|
|
threads you will use at once. The number of kernel-level threads (i.e.
|
|
concurrency level) is then determined as min([max number of threads to
|
|
use],[number of available processors]).</LI>
|
|
</OL>
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<P>
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<HR SIZE=4 WIDTH="100%"></P>
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