Date: Tue, 28 Aug 2001 23:40:34 +0900 From: Fuyuhiko Maruyama <fuyuhik8@is.titech.ac.jp> To: Arun Sharma <arun@sharmas.dhs.org> Cc: Fuyuhiko Maruyama <fuyuhik8@is.titech.ac.jp>, java@FreeBSD.ORG Subject: Re: JVM and native threads Message-ID: <554rqsqmcd.wl@tripper.private> In-Reply-To: <20010827181249.A16093@sharmas.dhs.org> References: <20010824233304.A32099@sharmas.dhs.org> <55vgjcqv87.wl@tripper.private> <20010825095746.A1015@sharmas.dhs.org> <55heuv0xtl.wl@tripper.private> <20010826171010.A6742@gnuppy> <20010827143244.A12305@misty.eyesbeyond.com> <55k7zqnd1x.wl@tripper.private> <20010827095624.B14875@sharmas.dhs.org> <55itf9cmln.wl@tripper.private> <20010827181249.A16093@sharmas.dhs.org>
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At Mon, 27 Aug 2001 18:12:49 -0700, Arun Sharma wrote: > > On Tue, Aug 28, 2001 at 04:46:28AM +0900, Fuyuhiko Maruyama wrote: > > Thanks, it is interesting. > > > > In fact, it seems quite curious for me because you say nothing about > > thread's context. So I dig the orp-20010727 sources and found that > > current ORP doesn't well support Linux platform. Current ORP may > > cause disaster when GC is happen on Linux, possible senarios are: > > 1. GC system collects live object refered only by register. > > 2. GC system moves live objects refered by register and it doesn't > > treat pointers on register to catch up moving of objects. > > 3. GC system cannot ensure all threads are suspended at GC safepoint. > > > > Do I misunderstand? > > > > Since they claim to run SpecJVM on Linux and it doesn't crash and burn, > they must be doing something right :) Codes at root_set_enum_ia32.cpp says it works as thier papers but it isn't true on Linux because the key function thread_gc_get_context(...) isn't implemented for Linux. See: 1. base_natives/common/thread_manager.cpp 2. mains/orp/stubs.cpp 3. arch/ia32/base_natives/java_lang_thread_ia32.h Why the function isn't implemented in Linux is just the same problem we have, I think -- there is no POSIX API to get context of thread. -- Fuyuhiko MARUYAMA <fuyuhik8@is.titech.ac.jp> Matsuoka laboratory, Department of Mathematical and Computing Sciences, Graduate School of Information Science and Engineering, Tokyo Institute of Technology. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-java" in the body of the message
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