src/share/vm/memory/gcLocker.cpp

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   1 /*
   2  * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 # include "incls/_precompiled.incl"
  26 # include "incls/_gcLocker.cpp.incl"


  27 
  28 volatile jint GC_locker::_jni_lock_count = 0;
  29 volatile jint GC_locker::_lock_count     = 0;
  30 volatile bool GC_locker::_needs_gc       = false;
  31 volatile bool GC_locker::_doing_gc       = false;
  32 
  33 void GC_locker::stall_until_clear() {
  34   assert(!JavaThread::current()->in_critical(), "Would deadlock");
  35   if (PrintJNIGCStalls && PrintGCDetails) {
  36     ResourceMark rm; // JavaThread::name() allocates to convert to UTF8
  37     gclog_or_tty->print_cr(
  38       "Allocation failed. Thread \"%s\" is stalled by JNI critical section.",
  39       JavaThread::current()->name());
  40   }
  41   MutexLocker   ml(JNICritical_lock);
  42   // Wait for _needs_gc  to be cleared
  43   while (GC_locker::needs_gc()) {
  44     JNICritical_lock->wait();
  45   }
  46 }


   1 /*
   2  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  *
  23  */
  24 
  25 #include "precompiled.hpp"
  26 #include "memory/gcLocker.inline.hpp"
  27 #include "memory/resourceArea.hpp"
  28 #include "memory/sharedHeap.hpp"
  29 
  30 volatile jint GC_locker::_jni_lock_count = 0;
  31 volatile jint GC_locker::_lock_count     = 0;
  32 volatile bool GC_locker::_needs_gc       = false;
  33 volatile bool GC_locker::_doing_gc       = false;
  34 
  35 void GC_locker::stall_until_clear() {
  36   assert(!JavaThread::current()->in_critical(), "Would deadlock");
  37   if (PrintJNIGCStalls && PrintGCDetails) {
  38     ResourceMark rm; // JavaThread::name() allocates to convert to UTF8
  39     gclog_or_tty->print_cr(
  40       "Allocation failed. Thread \"%s\" is stalled by JNI critical section.",
  41       JavaThread::current()->name());
  42   }
  43   MutexLocker   ml(JNICritical_lock);
  44   // Wait for _needs_gc  to be cleared
  45   while (GC_locker::needs_gc()) {
  46     JNICritical_lock->wait();
  47   }
  48 }