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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 |
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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() { |
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152 assert_locked_or_safepoint(Safepoint_lock); |
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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 |