Date: Mon, 30 Oct 2006 11:44:35 -0500 (EST) From: Daniel Eischen <eischen@vigrid.com> To: Greg Lewis <glewis@eyesbeyond.com> Cc: Paul Allen <nospam@ugcs.caltech.edu>, Lev Serebryakov <lev@freebsd.org>, Robert Watson <rwatson@freebsd.org>, Julian Elischer <julian@elischer.org>, current@freebsd.org Subject: Re: KSE, libpthread & libthr: almost newbie question Message-ID: <Pine.GSO.4.64.0610301141550.23983@sea.ntplx.net> In-Reply-To: <20061030163327.GA22419@misty.eyesbeyond.com> References: <45426071.7020403@elischer.org> <602423478.20061028001449@serebryakov.spb.ru> <4542896D.1050001@elischer.org> <20061027231642.GJ30707@riyal.ugcs.caltech.edu> <45429703.8070305@elischer.org> <20061028104741.Q69980@fledge.watson.org> <45442A35.2030803@elischer.org> <20061029090309.T27107@fledge.watson.org> <20061029182108.GA46604@misty.eyesbeyond.com> <45458C7E.50104@elischer.org> <20061030163327.GA22419@misty.eyesbeyond.com>
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On Mon, 30 Oct 2006, Greg Lewis wrote: > On Sun, Oct 29, 2006 at 09:24:14PM -0800, Julian Elischer wrote: >> Greg Lewis wrote: >> >>> If you really want to know, just send the running process a SIGQUIT and >>> it will dump the currently running threads to stdout. But yes, 1.4 and 1.5 >>> both use "native" threads which correspond 1:1 with OS threads (plus >>> there are threads the JVM creates itself, as you note). The JVM threads >>> include garbage collection and AWT event handlers at least. >>> >> >> I gather it doesn't use libpthread, but rather just the syscalls? > > No, it does use libpthread (or libthr, or libc_r if you so choose). What > I'm saying is that the JVM maps a single Java thread to a single <pthread > library of your choice> thread. How that maps to a kernel thread is > then defined by the threading library. > > The point is that the JVM doesn't do any internal M:N business itself, > which was the original point under discussion IIRC. Does the JVM specify system or process scope threads when it does its mapping? Or does it not use pthread_attr_setscope() at all? (I know this doesn't apply to libthr or libc_r, only libpthread.) -- DE
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