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 }