87 //
88 // A single VMThread (the primordial thread) spawns all other threads
89 // and is itself used by other threads to offload heavy vm operations
90 // like scavenge, garbage_collect etc.
91 //
92
93 class VMThread: public NamedThread {
94 private:
95 static ThreadPriority _current_priority;
96
97 static bool _should_terminate;
98 static bool _terminated;
99 static Monitor * _terminate_lock;
100 static PerfCounter* _perf_accumulated_vm_operation_time;
101
102 void evaluate_operation(VM_Operation* op);
103 public:
104 // Constructor
105 VMThread();
106
107 // Tester
108 bool is_VM_thread() const { return true; }
109 bool is_GC_thread() const { return true; }
110
111 // The ever running loop for the VMThread
112 void loop();
113
114 // Called to stop the VM thread
115 static void wait_for_vm_thread_exit();
116 static bool should_terminate() { return _should_terminate; }
117 static bool is_terminated() { return _terminated == true; }
118
119 // Execution of vm operation
120 static void execute(VM_Operation* op);
121
122 // Returns the current vm operation if any.
123 static VM_Operation* vm_operation() { return _cur_vm_operation; }
124
125 // Returns the single instance of VMThread.
126 static VMThread* vm_thread() { return _vm_thread; }
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87 //
88 // A single VMThread (the primordial thread) spawns all other threads
89 // and is itself used by other threads to offload heavy vm operations
90 // like scavenge, garbage_collect etc.
91 //
92
93 class VMThread: public NamedThread {
94 private:
95 static ThreadPriority _current_priority;
96
97 static bool _should_terminate;
98 static bool _terminated;
99 static Monitor * _terminate_lock;
100 static PerfCounter* _perf_accumulated_vm_operation_time;
101
102 void evaluate_operation(VM_Operation* op);
103 public:
104 // Constructor
105 VMThread();
106
107 // No destruction allowed
108 ~VMThread() {
109 guarantee(false, "VMThread deletion must fix the race with VM termination");
110 }
111
112
113 // Tester
114 bool is_VM_thread() const { return true; }
115 bool is_GC_thread() const { return true; }
116
117 // The ever running loop for the VMThread
118 void loop();
119
120 // Called to stop the VM thread
121 static void wait_for_vm_thread_exit();
122 static bool should_terminate() { return _should_terminate; }
123 static bool is_terminated() { return _terminated == true; }
124
125 // Execution of vm operation
126 static void execute(VM_Operation* op);
127
128 // Returns the current vm operation if any.
129 static VM_Operation* vm_operation() { return _cur_vm_operation; }
130
131 // Returns the single instance of VMThread.
132 static VMThread* vm_thread() { return _vm_thread; }
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