68 }
69 }
70
71 bool VM_CMS_Operation::lost_race() const {
72 if (CMSCollector::abstract_state() == CMSCollector::Idling) {
73 // We lost a race to a foreground collection
74 // -- there's nothing to do
75 return true;
76 }
77 assert(CMSCollector::abstract_state() == legal_state(),
78 "Inconsistent collector state?");
79 return false;
80 }
81
82 bool VM_CMS_Operation::doit_prologue() {
83 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking");
84 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock");
85 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
86 "Possible deadlock");
87
88 if (needs_pll()) {
89 acquire_pending_list_lock();
90 }
91 // Get the Heap_lock after the pending_list_lock.
92 Heap_lock->lock();
93 if (lost_race()) {
94 assert(_prologue_succeeded == false, "Initialized in c'tor");
95 Heap_lock->unlock();
96 if (needs_pll()) {
97 release_and_notify_pending_list_lock();
98 }
99 } else {
100 _prologue_succeeded = true;
101 }
102 return _prologue_succeeded;
103 }
104
105 void VM_CMS_Operation::doit_epilogue() {
106 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking");
107 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock");
108 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
109 "Possible deadlock");
110
111 // Release the Heap_lock first.
112 Heap_lock->unlock();
113 if (needs_pll()) {
114 release_and_notify_pending_list_lock();
115 }
116 }
117
118 //////////////////////////////////////////////////////////
119 // Methods in class VM_CMS_Initial_Mark
120 //////////////////////////////////////////////////////////
121 void VM_CMS_Initial_Mark::doit() {
122 if (lost_race()) {
123 // Nothing to do.
124 return;
125 }
126 HS_PRIVATE_CMS_INITMARK_BEGIN();
127 GCIdMark gc_id_mark(_gc_id);
128
129 _collector->_gc_timer_cm->register_gc_pause_start("Initial Mark");
130
131 GenCollectedHeap* gch = GenCollectedHeap::heap();
132 GCCauseSetter gccs(gch, GCCause::_cms_initial_mark);
133
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68 }
69 }
70
71 bool VM_CMS_Operation::lost_race() const {
72 if (CMSCollector::abstract_state() == CMSCollector::Idling) {
73 // We lost a race to a foreground collection
74 // -- there's nothing to do
75 return true;
76 }
77 assert(CMSCollector::abstract_state() == legal_state(),
78 "Inconsistent collector state?");
79 return false;
80 }
81
82 bool VM_CMS_Operation::doit_prologue() {
83 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking");
84 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock");
85 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
86 "Possible deadlock");
87
88 if (needs_pending_list_lock()) {
89 acquire_pending_list_lock();
90 }
91 // Get the Heap_lock after the pending_list_lock.
92 Heap_lock->lock();
93 if (lost_race()) {
94 assert(_prologue_succeeded == false, "Initialized in c'tor");
95 Heap_lock->unlock();
96 if (needs_pending_list_lock()) {
97 release_and_notify_pending_list_lock();
98 }
99 } else {
100 _prologue_succeeded = true;
101 }
102 return _prologue_succeeded;
103 }
104
105 void VM_CMS_Operation::doit_epilogue() {
106 assert(Thread::current()->is_ConcurrentGC_thread(), "just checking");
107 assert(!CMSCollector::foregroundGCShouldWait(), "Possible deadlock");
108 assert(!ConcurrentMarkSweepThread::cms_thread_has_cms_token(),
109 "Possible deadlock");
110
111 // Release the Heap_lock first.
112 Heap_lock->unlock();
113 if (needs_pending_list_lock()) {
114 release_and_notify_pending_list_lock();
115 }
116 }
117
118 //////////////////////////////////////////////////////////
119 // Methods in class VM_CMS_Initial_Mark
120 //////////////////////////////////////////////////////////
121 void VM_CMS_Initial_Mark::doit() {
122 if (lost_race()) {
123 // Nothing to do.
124 return;
125 }
126 HS_PRIVATE_CMS_INITMARK_BEGIN();
127 GCIdMark gc_id_mark(_gc_id);
128
129 _collector->_gc_timer_cm->register_gc_pause_start("Initial Mark");
130
131 GenCollectedHeap* gch = GenCollectedHeap::heap();
132 GCCauseSetter gccs(gch, GCCause::_cms_initial_mark);
133
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