Mercurial > hg > graal-jvmci-8

comparison src/share/vm/runtime/safepoint.hpp @ 4867:1a2723f7ad8e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
7129164: JNI Get/ReleasePrimitiveArrayCritical doesn't scale Reviewed-by: kvn, iveresov, dholmes
author never
date Sun, 29 Jan 2012 16:46:04 -0800
parents f95d63e2154a
children 0382d2b469b2
comparison
equal deleted inserted replaced
4826:072384a61312 4867:1a2723f7ad8e
1 /* 1 /*
2 * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved. 2 * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 * 4 *
5 * This code is free software; you can redistribute it and/or modify it 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 6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
27 27
28 #include "asm/assembler.hpp" 28 #include "asm/assembler.hpp"
29 #include "code/nmethod.hpp" 29 #include "code/nmethod.hpp"
30 #include "memory/allocation.hpp" 30 #include "memory/allocation.hpp"
31 #include "runtime/extendedPC.hpp" 31 #include "runtime/extendedPC.hpp"
32 #include "runtime/mutexLocker.hpp"
32 #include "runtime/os.hpp" 33 #include "runtime/os.hpp"
33 #include "utilities/ostream.hpp" 34 #include "utilities/ostream.hpp"
34 35
35 // 36 //
36 // Safepoint synchronization 37 // Safepoint synchronization
90 } SafepointStats; 91 } SafepointStats;
91 92
92 private: 93 private:
93 static volatile SynchronizeState _state; // Threads might read this flag directly, without acquireing the Threads_lock 94 static volatile SynchronizeState _state; // Threads might read this flag directly, without acquireing the Threads_lock
94 static volatile int _waiting_to_block; // number of threads we are waiting for to block 95 static volatile int _waiting_to_block; // number of threads we are waiting for to block
96 static int _current_jni_active_count; // Counts the number of active critical natives during the safepoint
95 97
96 // This counter is used for fast versions of jni_Get<Primitive>Field. 98 // This counter is used for fast versions of jni_Get<Primitive>Field.
97 // An even value means there is no ongoing safepoint operations. 99 // An even value means there is no ongoing safepoint operations.
98 // The counter is incremented ONLY at the beginning and end of each 100 // The counter is incremented ONLY at the beginning and end of each
99 // safepoint. The fact that Threads_lock is held throughout each pair of 101 // safepoint. The fact that Threads_lock is held throughout each pair of
144 146
145 inline static bool do_call_back() { 147 inline static bool do_call_back() {
146 return (_state != _not_synchronized); 148 return (_state != _not_synchronized);
147 } 149 }
148 150
151 inline static void increment_jni_active_count() {
152 assert_locked_or_safepoint(Safepoint_lock);
153 _current_jni_active_count++;
154 }
155
149 // Called when a thread volantary blocks 156 // Called when a thread volantary blocks
150 static void block(JavaThread *thread); 157 static void block(JavaThread *thread);
151 static void signal_thread_at_safepoint() { _waiting_to_block--; } 158 static void signal_thread_at_safepoint() { _waiting_to_block--; }
152 159
153 // Exception handling for page polling 160 // Exception handling for page polling