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src/hotspot/share/gc/shared/gcLocker.cpp

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rev 47674 : Port 09.17.Thread_SMR_logging_update from JDK9 to JDK10
rev 47676 : eosterlund, stefank CR - refactor code into threadSMR.cpp and threadSMR.hpp
rev 47679 : stefank, coleenp CR - refactor most JavaThreadIterator usage to use JavaThreadIteratorWithHandle.
   1 /*
   2  * Copyright (c) 1997, 2016, 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 "gc/shared/collectedHeap.hpp"
  27 #include "gc/shared/gcLocker.inline.hpp"
  28 #include "memory/resourceArea.hpp"
  29 #include "logging/log.hpp"
  30 #include "runtime/atomic.hpp"
  31 #include "runtime/thread.inline.hpp"

  32 
  33 volatile jint GCLocker::_jni_lock_count = 0;
  34 volatile bool GCLocker::_needs_gc       = false;
  35 volatile bool GCLocker::_doing_gc       = false;
  36 
  37 #ifdef ASSERT
  38 volatile jint GCLocker::_debug_jni_lock_count = 0;
  39 #endif
  40 
  41 
  42 #ifdef ASSERT
  43 void GCLocker::verify_critical_count() {
  44   if (SafepointSynchronize::is_at_safepoint()) {
  45     assert(!needs_gc() || _debug_jni_lock_count == _jni_lock_count, "must agree");
  46     int count = 0;
  47     // Count the number of threads with critical operations in progress
  48     for (JavaThread* thr = Threads::first(); thr; thr = thr->next()) {

  49       if (thr->in_critical()) {
  50         count++;
  51       }
  52     }
  53     if (_jni_lock_count != count) {
  54       log_error(gc, verify)("critical counts don't match: %d != %d", _jni_lock_count, count);
  55       for (JavaThread* thr = Threads::first(); thr; thr = thr->next()) {

  56         if (thr->in_critical()) {
  57           log_error(gc, verify)(INTPTR_FORMAT " in_critical %d", p2i(thr), thr->in_critical());
  58         }
  59       }
  60     }
  61     assert(_jni_lock_count == count, "must be equal");
  62   }
  63 }
  64 
  65 // In debug mode track the locking state at all times
  66 void GCLocker::increment_debug_jni_lock_count() {
  67   assert(_debug_jni_lock_count >= 0, "bad value");
  68   Atomic::inc(&_debug_jni_lock_count);
  69 }
  70 
  71 void GCLocker::decrement_debug_jni_lock_count() {
  72   assert(_debug_jni_lock_count > 0, "bad value");
  73   Atomic::dec(&_debug_jni_lock_count);
  74 }
  75 #endif


   1 /*
   2  * Copyright (c) 1997, 2017, 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 "gc/shared/collectedHeap.hpp"
  27 #include "gc/shared/gcLocker.inline.hpp"
  28 #include "memory/resourceArea.hpp"
  29 #include "logging/log.hpp"
  30 #include "runtime/atomic.hpp"
  31 #include "runtime/thread.inline.hpp"
  32 #include "runtime/threadSMR.hpp"
  33 
  34 volatile jint GCLocker::_jni_lock_count = 0;
  35 volatile bool GCLocker::_needs_gc       = false;
  36 volatile bool GCLocker::_doing_gc       = false;
  37 
  38 #ifdef ASSERT
  39 volatile jint GCLocker::_debug_jni_lock_count = 0;
  40 #endif
  41 
  42 
  43 #ifdef ASSERT
  44 void GCLocker::verify_critical_count() {
  45   if (SafepointSynchronize::is_at_safepoint()) {
  46     assert(!needs_gc() || _debug_jni_lock_count == _jni_lock_count, "must agree");
  47     int count = 0;
  48     // Count the number of threads with critical operations in progress
  49     JavaThreadIteratorWithHandle jtiwh;
  50     for (; JavaThread *thr = jtiwh.next(); ) {
  51       if (thr->in_critical()) {
  52         count++;
  53       }
  54     }
  55     if (_jni_lock_count != count) {
  56       log_error(gc, verify)("critical counts don't match: %d != %d", _jni_lock_count, count);
  57       jtiwh.rewind();
  58       for (; JavaThread *thr = jtiwh.next(); ) {
  59         if (thr->in_critical()) {
  60           log_error(gc, verify)(INTPTR_FORMAT " in_critical %d", p2i(thr), thr->in_critical());
  61         }
  62       }
  63     }
  64     assert(_jni_lock_count == count, "must be equal");
  65   }
  66 }
  67 
  68 // In debug mode track the locking state at all times
  69 void GCLocker::increment_debug_jni_lock_count() {
  70   assert(_debug_jni_lock_count >= 0, "bad value");
  71   Atomic::inc(&_debug_jni_lock_count);
  72 }
  73 
  74 void GCLocker::decrement_debug_jni_lock_count() {
  75   assert(_debug_jni_lock_count > 0, "bad value");
  76   Atomic::dec(&_debug_jni_lock_count);
  77 }
  78 #endif


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