33 #define assert_not_enter_unconstrained(phase) \ 34 assert((phase) != UNCONSTRAINED_PHASE, "Cannot enter \"unconstrained\" phase") 35 36 #define assert_manager_is_tos(manager, stack, kind) \ 37 assert((manager) == (stack)->_top, kind " manager is not top of stack") 38 39 ConcurrentGCPhaseManager::Stack::Stack() : 40 _requested_phase(UNCONSTRAINED_PHASE), 41 _top(NULL) 42 { } 43 44 ConcurrentGCPhaseManager::ConcurrentGCPhaseManager(int phase, Stack* stack) : 45 _phase(phase), 46 _active(true), 47 _prev(NULL), 48 _stack(stack) 49 { 50 assert_ConcurrentGC_thread(); 51 assert_not_enter_unconstrained(phase); 52 assert(stack != NULL, "precondition"); 53 MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); 54 if (stack->_top != NULL) { 55 assert(stack->_top->_active, "precondition"); 56 _prev = stack->_top; 57 } 58 stack->_top = this; 59 ml.notify_all(); 60 } 61 62 ConcurrentGCPhaseManager::~ConcurrentGCPhaseManager() { 63 assert_ConcurrentGC_thread(); 64 MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); 65 assert_manager_is_tos(this, _stack, "This"); 66 wait_when_requested_impl(); 67 _stack->_top = _prev; 68 ml.notify_all(); 69 } 70 71 bool ConcurrentGCPhaseManager::is_requested() const { 72 assert_ConcurrentGC_thread(); 73 MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); 74 assert_manager_is_tos(this, _stack, "This"); 75 return _active && (_stack->_requested_phase == _phase); 76 } 77 78 bool ConcurrentGCPhaseManager::wait_when_requested_impl() const { 79 assert_ConcurrentGC_thread(); 80 assert_lock_strong(CGCPhaseManager_lock); 81 bool waited = false; 82 while (_active && (_stack->_requested_phase == _phase)) { 83 waited = true; 84 CGCPhaseManager_lock->wait(Mutex::_no_safepoint_check_flag); 85 } 86 return waited; 87 } 88 89 bool ConcurrentGCPhaseManager::wait_when_requested() const { 90 assert_ConcurrentGC_thread(); 91 MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); 92 assert_manager_is_tos(this, _stack, "This"); 93 return wait_when_requested_impl(); 94 } 95 96 void ConcurrentGCPhaseManager::set_phase(int phase, bool force) { 97 assert_ConcurrentGC_thread(); 98 assert_not_enter_unconstrained(phase); 99 MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); 100 assert_manager_is_tos(this, _stack, "This"); 101 if (!force) wait_when_requested_impl(); 102 _phase = phase; 103 ml.notify_all(); 104 } 105 106 void ConcurrentGCPhaseManager::deactivate() { 107 assert_ConcurrentGC_thread(); 108 MonitorLockerEx ml(CGCPhaseManager_lock, Mutex::_no_safepoint_check_flag); 109 assert_manager_is_tos(this, _stack, "This"); 110 _active = false; 111 ml.notify_all(); 112 } 113 114 bool ConcurrentGCPhaseManager::wait_for_phase(int phase, Stack* stack) { 115 assert(Thread::current()->is_Java_thread(), "precondition"); 116 assert(stack != NULL, "precondition"); 117 MonitorLockerEx ml(CGCPhaseManager_lock); 118 // Update request and notify service of change. 119 if (stack->_requested_phase != phase) { 120 stack->_requested_phase = phase; 121 ml.notify_all(); 122 } 123 124 if (phase == UNCONSTRAINED_PHASE) { 125 return true; 126 } 127 128 // Wait until phase or IDLE is active. | 33 #define assert_not_enter_unconstrained(phase) \ 34 assert((phase) != UNCONSTRAINED_PHASE, "Cannot enter \"unconstrained\" phase") 35 36 #define assert_manager_is_tos(manager, stack, kind) \ 37 assert((manager) == (stack)->_top, kind " manager is not top of stack") 38 39 ConcurrentGCPhaseManager::Stack::Stack() : 40 _requested_phase(UNCONSTRAINED_PHASE), 41 _top(NULL) 42 { } 43 44 ConcurrentGCPhaseManager::ConcurrentGCPhaseManager(int phase, Stack* stack) : 45 _phase(phase), 46 _active(true), 47 _prev(NULL), 48 _stack(stack) 49 { 50 assert_ConcurrentGC_thread(); 51 assert_not_enter_unconstrained(phase); 52 assert(stack != NULL, "precondition"); 53 MonitorLockerEx ml(CGCPhaseManager_lock); 54 if (stack->_top != NULL) { 55 assert(stack->_top->_active, "precondition"); 56 _prev = stack->_top; 57 } 58 stack->_top = this; 59 ml.notify_all(); 60 } 61 62 ConcurrentGCPhaseManager::~ConcurrentGCPhaseManager() { 63 assert_ConcurrentGC_thread(); 64 MonitorLockerEx ml(CGCPhaseManager_lock); 65 assert_manager_is_tos(this, _stack, "This"); 66 wait_when_requested_impl(); 67 _stack->_top = _prev; 68 ml.notify_all(); 69 } 70 71 bool ConcurrentGCPhaseManager::is_requested() const { 72 assert_ConcurrentGC_thread(); 73 MonitorLockerEx ml(CGCPhaseManager_lock); 74 assert_manager_is_tos(this, _stack, "This"); 75 return _active && (_stack->_requested_phase == _phase); 76 } 77 78 bool ConcurrentGCPhaseManager::wait_when_requested_impl() const { 79 assert_ConcurrentGC_thread(); 80 assert_lock_strong(CGCPhaseManager_lock); 81 bool waited = false; 82 while (_active && (_stack->_requested_phase == _phase)) { 83 waited = true; 84 // wait safepoint check should be a property of the thread type also. 85 CGCPhaseManager_lock->wait(Mutex::_no_safepoint_check_flag); 86 } 87 return waited; 88 } 89 90 bool ConcurrentGCPhaseManager::wait_when_requested() const { 91 assert_ConcurrentGC_thread(); 92 MonitorLockerEx ml(CGCPhaseManager_lock); 93 assert_manager_is_tos(this, _stack, "This"); 94 return wait_when_requested_impl(); 95 } 96 97 void ConcurrentGCPhaseManager::set_phase(int phase, bool force) { 98 assert_ConcurrentGC_thread(); 99 assert_not_enter_unconstrained(phase); 100 MonitorLockerEx ml(CGCPhaseManager_lock); 101 assert_manager_is_tos(this, _stack, "This"); 102 if (!force) wait_when_requested_impl(); 103 _phase = phase; 104 ml.notify_all(); 105 } 106 107 void ConcurrentGCPhaseManager::deactivate() { 108 assert_ConcurrentGC_thread(); 109 MonitorLockerEx ml(CGCPhaseManager_lock); 110 assert_manager_is_tos(this, _stack, "This"); 111 _active = false; 112 ml.notify_all(); 113 } 114 115 bool ConcurrentGCPhaseManager::wait_for_phase(int phase, Stack* stack) { 116 assert(Thread::current()->is_Java_thread(), "precondition"); 117 assert(stack != NULL, "precondition"); 118 MonitorLockerEx ml(CGCPhaseManager_lock); 119 // Update request and notify service of change. 120 if (stack->_requested_phase != phase) { 121 stack->_requested_phase = phase; 122 ml.notify_all(); 123 } 124 125 if (phase == UNCONSTRAINED_PHASE) { 126 return true; 127 } 128 129 // Wait until phase or IDLE is active. |