Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/runtime/biasedLocking.cpp
src/share/vm/runtime/biasedLocking.cpp
- changeset 528
- c6ff24ceec1c
- parent 519
- 6e085831cad7
- child 631
- d1605aabd0a1
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| 527:ebec5b9731e2 | 528:c6ff24ceec1c |
|---|---|
| 1 | |
| 2 /* | 1 /* |
| 3 * Copyright 2005-2007 Sun Microsystems, Inc. All Rights Reserved. | 2 * Copyright 2005-2007 Sun Microsystems, Inc. All Rights Reserved. |
| 4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 5 * | 4 * |
| 6 * 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 |
| 35 static void enable_biased_locking(klassOop k) { | 34 static void enable_biased_locking(klassOop k) { |
| 36 Klass::cast(k)->set_prototype_header(markOopDesc::biased_locking_prototype()); | 35 Klass::cast(k)->set_prototype_header(markOopDesc::biased_locking_prototype()); |
| 37 } | 36 } |
| 38 | 37 |
| 39 class VM_EnableBiasedLocking: public VM_Operation { | 38 class VM_EnableBiasedLocking: public VM_Operation { |
| 39 private: | |
| 40 bool _is_cheap_allocated; | |
| 40 public: | 41 public: |
| 41 VM_EnableBiasedLocking() {} | 42 VM_EnableBiasedLocking(bool is_cheap_allocated) { _is_cheap_allocated = is_cheap_allocated; } |
| 42 VMOp_Type type() const { return VMOp_EnableBiasedLocking; } | 43 VMOp_Type type() const { return VMOp_EnableBiasedLocking; } |
| 43 Mode evaluation_mode() const { return _async_safepoint; } | 44 Mode evaluation_mode() const { return _is_cheap_allocated ? _async_safepoint : _safepoint; } |
| 44 bool is_cheap_allocated() const { return true; } | 45 bool is_cheap_allocated() const { return _is_cheap_allocated; } |
| 45 | 46 |
| 46 void doit() { | 47 void doit() { |
| 47 // Iterate the system dictionary enabling biased locking for all | 48 // Iterate the system dictionary enabling biased locking for all |
| 48 // currently loaded classes | 49 // currently loaded classes |
| 49 SystemDictionary::classes_do(enable_biased_locking); | 50 SystemDictionary::classes_do(enable_biased_locking); |
| 65 EnableBiasedLockingTask(size_t interval_time) : PeriodicTask(interval_time) {} | 66 EnableBiasedLockingTask(size_t interval_time) : PeriodicTask(interval_time) {} |
| 66 | 67 |
| 67 virtual void task() { | 68 virtual void task() { |
| 68 // Use async VM operation to avoid blocking the Watcher thread. | 69 // Use async VM operation to avoid blocking the Watcher thread. |
| 69 // VM Thread will free C heap storage. | 70 // VM Thread will free C heap storage. |
| 70 VM_EnableBiasedLocking *op = new VM_EnableBiasedLocking(); | 71 VM_EnableBiasedLocking *op = new VM_EnableBiasedLocking(true); |
| 71 VMThread::execute(op); | 72 VMThread::execute(op); |
| 72 | 73 |
| 73 // Reclaim our storage and disenroll ourself | 74 // Reclaim our storage and disenroll ourself |
| 74 delete this; | 75 delete this; |
| 75 } | 76 } |
| 87 if (UseBiasedLocking) { | 88 if (UseBiasedLocking) { |
| 88 if (BiasedLockingStartupDelay > 0) { | 89 if (BiasedLockingStartupDelay > 0) { |
| 89 EnableBiasedLockingTask* task = new EnableBiasedLockingTask(BiasedLockingStartupDelay); | 90 EnableBiasedLockingTask* task = new EnableBiasedLockingTask(BiasedLockingStartupDelay); |
| 90 task->enroll(); | 91 task->enroll(); |
| 91 } else { | 92 } else { |
| 92 VM_EnableBiasedLocking op; | 93 VM_EnableBiasedLocking op(false); |
| 93 VMThread::execute(&op); | 94 VMThread::execute(&op); |
| 94 } | 95 } |
| 95 } | 96 } |
| 96 } | 97 } |
| 97 | 98 |
