1 /* 2 * Copyright (c) 2012, 2018, 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 "jfr/jni/jfrJavaSupport.hpp" 27 #include "jfr/recorder/repository/jfrChunkWriter.hpp" 28 #include "jfr/recorder/repository/jfrChunkSizeNotifier.hpp" 29 30 size_t JfrChunkSizeNotifier::_chunk_size_threshold = 0; 31 32 void JfrChunkSizeNotifier::set_chunk_size_threshold(size_t bytes) { 33 _chunk_size_threshold = bytes; 34 } 35 36 size_t JfrChunkSizeNotifier::chunk_size_threshold() { 37 return _chunk_size_threshold; 38 } 39 40 static jobject new_chunk_monitor = NULL; 41 42 // lazy install 43 static jobject get_new_chunk_monitor(Thread* thread) { 44 static bool initialized = false; 45 if (initialized) { 46 assert(new_chunk_monitor != NULL, "invariant"); 47 return new_chunk_monitor; 48 } 49 assert(new_chunk_monitor == NULL, "invariant"); 50 // read static field 51 HandleMark hm(thread); 52 static const char klass[] = "jdk/jfr/internal/JVM"; 53 static const char field[] = "FILE_DELTA_CHANGE"; 54 static const char signature[] = "Ljava/lang/Object;"; 55 JavaValue result(T_OBJECT); 56 JfrJavaArguments field_args(&result, klass, field, signature, thread); 57 JfrJavaSupport::get_field_global_ref(&field_args, thread); 58 new_chunk_monitor = result.get_jobject(); 59 initialized = new_chunk_monitor != NULL; 60 return new_chunk_monitor; 61 } 62 63 void JfrChunkSizeNotifier::notify() { 64 Thread* const thread = Thread::current(); 65 JfrJavaSupport::notify_all(get_new_chunk_monitor(thread), thread); 66 } 67 68 void JfrChunkSizeNotifier::release_monitor() { 69 if (new_chunk_monitor != NULL) { 70 JfrJavaSupport::destroy_global_jni_handle(new_chunk_monitor); 71 new_chunk_monitor = NULL; 72 } 73 }