Mercurial > jdk8-mips64-public > hotspot / file comparison
comparison: src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
src/share/vm/gc_implementation/concurrentMarkSweep/concurrentMarkSweepGeneration.cpp
- changeset 5784
- 190899198332
- parent 5694
- 7944aba7ba41
- child 6088
- 40b8c6bad703
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inserted
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| 5783:c1fbf21c7397 | 5784:190899198332 |
|---|---|
| 9063 _num_par_pushes -=n; | 9063 _num_par_pushes -=n; |
| 9064 #endif | 9064 #endif |
| 9065 return !stack->isEmpty(); | 9065 return !stack->isEmpty(); |
| 9066 } | 9066 } |
| 9067 | 9067 |
| 9068 #define BUSY (oop(0x1aff1aff)) | 9068 #define BUSY (cast_to_oop<intptr_t>(0x1aff1aff)) |
| 9069 // (MT-safe) Get a prefix of at most "num" from the list. | 9069 // (MT-safe) Get a prefix of at most "num" from the list. |
| 9070 // The overflow list is chained through the mark word of | 9070 // The overflow list is chained through the mark word of |
| 9071 // each object in the list. We fetch the entire list, | 9071 // each object in the list. We fetch the entire list, |
| 9072 // break off a prefix of the right size and return the | 9072 // break off a prefix of the right size and return the |
| 9073 // remainder. If other threads try to take objects from | 9073 // remainder. If other threads try to take objects from |
| 9096 assert(num < work_q->max_elems(), "Can't bite more than we can chew"); | 9096 assert(num < work_q->max_elems(), "Can't bite more than we can chew"); |
| 9097 if (_overflow_list == NULL) { | 9097 if (_overflow_list == NULL) { |
| 9098 return false; | 9098 return false; |
| 9099 } | 9099 } |
| 9100 // Grab the entire list; we'll put back a suffix | 9100 // Grab the entire list; we'll put back a suffix |
| 9101 oop prefix = (oop)Atomic::xchg_ptr(BUSY, &_overflow_list); | 9101 oop prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list)); |
| 9102 Thread* tid = Thread::current(); | 9102 Thread* tid = Thread::current(); |
| 9103 // Before "no_of_gc_threads" was introduced CMSOverflowSpinCount was | 9103 // Before "no_of_gc_threads" was introduced CMSOverflowSpinCount was |
| 9104 // set to ParallelGCThreads. | 9104 // set to ParallelGCThreads. |
| 9105 size_t CMSOverflowSpinCount = (size_t) no_of_gc_threads; // was ParallelGCThreads; | 9105 size_t CMSOverflowSpinCount = (size_t) no_of_gc_threads; // was ParallelGCThreads; |
| 9106 size_t sleep_time_millis = MAX2((size_t)1, num/100); | 9106 size_t sleep_time_millis = MAX2((size_t)1, num/100); |
| 9111 if (_overflow_list == NULL) { | 9111 if (_overflow_list == NULL) { |
| 9112 // Nothing left to take | 9112 // Nothing left to take |
| 9113 return false; | 9113 return false; |
| 9114 } else if (_overflow_list != BUSY) { | 9114 } else if (_overflow_list != BUSY) { |
| 9115 // Try and grab the prefix | 9115 // Try and grab the prefix |
| 9116 prefix = (oop)Atomic::xchg_ptr(BUSY, &_overflow_list); | 9116 prefix = cast_to_oop(Atomic::xchg_ptr(BUSY, &_overflow_list)); |
| 9117 } | 9117 } |
| 9118 } | 9118 } |
| 9119 // If the list was found to be empty, or we spun long | 9119 // If the list was found to be empty, or we spun long |
| 9120 // enough, we give up and return empty-handed. If we leave | 9120 // enough, we give up and return empty-handed. If we leave |
| 9121 // the list in the BUSY state below, it must be the case that | 9121 // the list in the BUSY state below, it must be the case that |
