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1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file | 1 // Copyright (c) 2015, the Dart project authors. Please see the AUTHORS file |
2 // for details. All rights reserved. Use of this source code is governed by a | 2 // for details. All rights reserved. Use of this source code is governed by a |
3 // BSD-style license that can be found in the LICENSE file. | 3 // BSD-style license that can be found in the LICENSE file. |
4 | 4 |
5 #ifndef VM_THREAD_REGISTRY_H_ | 5 #ifndef VM_THREAD_REGISTRY_H_ |
6 #define VM_THREAD_REGISTRY_H_ | 6 #define VM_THREAD_REGISTRY_H_ |
7 | 7 |
8 #include "vm/globals.h" | 8 #include "vm/globals.h" |
9 #include "vm/growable_array.h" | 9 #include "vm/growable_array.h" |
10 #include "vm/isolate.h" | 10 #include "vm/isolate.h" |
11 #include "vm/lockers.h" | 11 #include "vm/lockers.h" |
12 #include "vm/stack_frame.h" | 12 #include "vm/stack_frame.h" |
13 #include "vm/thread.h" | 13 #include "vm/thread.h" |
14 | 14 |
15 namespace dart { | 15 namespace dart { |
16 | 16 |
17 // Unordered collection of threads relating to a particular isolate. | 17 // Unordered collection of threads relating to a particular isolate. |
18 class ThreadRegistry { | 18 class ThreadRegistry { |
19 public: | 19 public: |
20 ThreadRegistry() | 20 ThreadRegistry() |
21 : monitor_(new Monitor()), | 21 : monitor_(new Monitor()), |
22 entries_(), | 22 entries_(), |
23 in_rendezvous_(false), | 23 in_rendezvous_(false), |
24 remaining_(0), | 24 remaining_(0), |
25 round_(0) {} | 25 round_(0) {} |
26 | 26 |
| 27 ~ThreadRegistry(); |
| 28 |
27 // Bring all threads in this isolate to a safepoint. The caller is | 29 // Bring all threads in this isolate to a safepoint. The caller is |
28 // expected to be implicitly at a safepoint. The threads will wait | 30 // expected to be implicitly at a safepoint. The threads will wait |
29 // until ResumeAllThreads is called. First participates in any | 31 // until ResumeAllThreads is called. First participates in any |
30 // already pending rendezvous requested by another thread. Any | 32 // already pending rendezvous requested by another thread. Any |
31 // thread that tries to enter this isolate during rendezvous will | 33 // thread that tries to enter this isolate during rendezvous will |
32 // wait in RestoreStateTo. Nesting is not supported: the caller must | 34 // wait in RestoreStateTo. Nesting is not supported: the caller must |
33 // call ResumeAllThreads before making further calls to | 35 // call ResumeAllThreads before making further calls to |
34 // SafepointThreads. | 36 // SafepointThreads. |
35 void SafepointThreads(); | 37 void SafepointThreads(); |
36 | 38 |
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131 StackFrame* frame = frames_iterator.NextFrame(); | 133 StackFrame* frame = frames_iterator.NextFrame(); |
132 while (frame != NULL) { | 134 while (frame != NULL) { |
133 frame->VisitObjectPointers(visitor); | 135 frame->VisitObjectPointers(visitor); |
134 frame = frames_iterator.NextFrame(); | 136 frame = frames_iterator.NextFrame(); |
135 } | 137 } |
136 } | 138 } |
137 } | 139 } |
138 | 140 |
139 private: | 141 private: |
140 struct Entry { | 142 struct Entry { |
| 143 // NOTE: |thread| is deleted automatically when the thread exits. |
| 144 // In other words, it is not safe to dereference |thread| unless you are on |
| 145 // the thread itself. |
141 Thread* thread; | 146 Thread* thread; |
142 bool scheduled; | 147 bool scheduled; |
143 Thread::State state; | 148 Thread::State state; |
144 }; | 149 }; |
145 | 150 |
146 // Returns Entry corresponding to thread in registry or NULL. | 151 // Returns Entry corresponding to thread in registry or NULL. |
147 // Note: Lock should be taken before this function is called. | 152 // Note: Lock should be taken before this function is called. |
148 // TODO(koda): Add method Monitor::IsOwnedByCurrentThread. | 153 // TODO(koda): Add method Monitor::IsOwnedByCurrentThread. |
149 Entry* FindEntry(Thread* thread) { | 154 Entry* FindEntry(Thread* thread) { |
150 for (int i = 0; i < entries_.length(); ++i) { | 155 for (int i = 0; i < entries_.length(); ++i) { |
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170 intptr_t remaining_; // Number of threads yet to reach their safepoint. | 175 intptr_t remaining_; // Number of threads yet to reach their safepoint. |
171 int64_t round_; // Counter, to prevent missing updates to remaining_ | 176 int64_t round_; // Counter, to prevent missing updates to remaining_ |
172 // (see comments in CheckSafepointLocked). | 177 // (see comments in CheckSafepointLocked). |
173 | 178 |
174 DISALLOW_COPY_AND_ASSIGN(ThreadRegistry); | 179 DISALLOW_COPY_AND_ASSIGN(ThreadRegistry); |
175 }; | 180 }; |
176 | 181 |
177 } // namespace dart | 182 } // namespace dart |
178 | 183 |
179 #endif // VM_THREAD_REGISTRY_H_ | 184 #endif // VM_THREAD_REGISTRY_H_ |
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