Mercurial > hg > truffle
view src/os_cpu/solaris_x86/vm/thread_solaris_x86.cpp @ 453:c96030fff130
6684579: SoftReference processing can be made more efficient
Summary: For current soft-ref clearing policies, we can decide at marking time if a soft-reference will definitely not be cleared, postponing the decision of whether it will definitely be cleared to the final reference processing phase. This can be especially beneficial in the case of concurrent collectors where the marking is usually concurrent but reference processing is usually not.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Thu, 20 Nov 2008 16:56:09 -0800 |
parents | d1605aabd0a1 |
children | c18cbe5936b8 |
line wrap: on
line source
/* * Copyright 2003-2008 Sun Microsystems, Inc. All Rights Reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ #include "incls/_precompiled.incl" #include "incls/_thread_solaris_x86.cpp.incl" // For Forte Analyzer AsyncGetCallTrace profiling support - thread is // currently interrupted by SIGPROF bool JavaThread::pd_get_top_frame_for_signal_handler(frame* fr_addr, void* ucontext, bool isInJava) { assert(Thread::current() == this, "caller must be current thread"); assert(this->is_Java_thread(), "must be JavaThread"); JavaThread* jt = (JavaThread *)this; // last_Java_frame is always walkable and safe use it if we have it if (jt->has_last_Java_frame()) { *fr_addr = jt->pd_last_frame(); return true; } ucontext_t* uc = (ucontext_t*) ucontext; // We always want to use the initial frame we create from the ucontext as // it certainly signals where we currently are. However that frame may not // be safe for calling sender. In that case if we have a last_Java_frame // then the forte walker will switch to that frame as the virtual sender // for the frame we create here which is not sender safe. intptr_t* ret_fp; intptr_t* ret_sp; ExtendedPC addr = os::Solaris::fetch_frame_from_ucontext(this, uc, &ret_sp, &ret_fp); // Something would really have to be screwed up to get a NULL pc if (addr.pc() == NULL ) { assert(false, "NULL pc from signal handler!"); return false; } // If sp and fp are nonsense just leave them out if ((address)ret_sp >= jt->stack_base() || (address)ret_sp < jt->stack_base() - jt->stack_size() ) { ret_sp = NULL; ret_fp = NULL; } else { // sp is reasonable is fp reasonable? if ( (address)ret_fp >= jt->stack_base() || ret_fp < ret_sp) { ret_fp = NULL; } } frame ret_frame(ret_sp, ret_fp, addr.pc()); *fr_addr = ret_frame; return true; }