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6666698: EnableBiasedLocking with BiasedLockingStartupDelay can block Watcher thread

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Enqueue VM_EnableBiasedLocking operation asynchronously

Reviewed-by: never, xlu, kbr, acorn
This commit is contained in:
Steve Bohne 2008-03-04 09:44:24 -05:00
parent 59cc274f16
commit c953a1e7b8
1 changed files with 9 additions and 4 deletions
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13
hotspot/src/share/vm/runtime/biasedLocking.cpp
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@ -38,8 +38,11 @@ static void enable_biased_locking(klassOop k) {
class VM_EnableBiasedLocking: public VM_Operation { class VM_EnableBiasedLocking: public VM_Operation {
public: public:
VM_EnableBiasedLocking() {} VM_EnableBiasedLocking() {}
VMOp_Type type() const { return VMOp_EnableBiasedLocking; } VMOp_Type type() const { return VMOp_EnableBiasedLocking; }
Mode evaluation_mode() const { return _async_safepoint; }
bool is_cheap_allocated() const { return true; }
void doit() { void doit() {
// Iterate the system dictionary enabling biased locking for all // Iterate the system dictionary enabling biased locking for all
// currently loaded classes // currently loaded classes
@ -62,8 +65,10 @@ class EnableBiasedLockingTask : public PeriodicTask {
EnableBiasedLockingTask(size_t interval_time) : PeriodicTask(interval_time) {} EnableBiasedLockingTask(size_t interval_time) : PeriodicTask(interval_time) {}
virtual void task() { virtual void task() {
VM_EnableBiasedLocking op; // Use async VM operation to avoid blocking the Watcher thread.
VMThread::execute(&op); // VM Thread will free C heap storage.
VM_EnableBiasedLocking *op = new VM_EnableBiasedLocking();
VMThread::execute(op);
// Reclaim our storage and disenroll ourself // Reclaim our storage and disenroll ourself
delete this; delete this;