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1 // Copyright 2012 the V8 project authors. All rights reserved. | 1 // Copyright 2012 the V8 project authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "src/v8threads.h" | 5 #include "src/v8threads.h" |
6 | 6 |
7 #include "src/api.h" | 7 #include "src/api.h" |
8 #include "src/bootstrapper.h" | 8 #include "src/bootstrapper.h" |
9 #include "src/debug/debug.h" | 9 #include "src/debug/debug.h" |
10 #include "src/execution.h" | 10 #include "src/execution.h" |
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25 | 25 |
26 | 26 |
27 // Once the Locker is initialized, the current thread will be guaranteed to have | 27 // Once the Locker is initialized, the current thread will be guaranteed to have |
28 // the lock for a given isolate. | 28 // the lock for a given isolate. |
29 void Locker::Initialize(v8::Isolate* isolate) { | 29 void Locker::Initialize(v8::Isolate* isolate) { |
30 DCHECK(isolate != NULL); | 30 DCHECK(isolate != NULL); |
31 has_lock_ = false; | 31 has_lock_ = false; |
32 top_level_ = true; | 32 top_level_ = true; |
33 isolate_ = reinterpret_cast<i::Isolate*>(isolate); | 33 isolate_ = reinterpret_cast<i::Isolate*>(isolate); |
34 // Record that the Locker has been used at least once. | 34 // Record that the Locker has been used at least once. |
35 base::NoBarrier_Store(&g_locker_was_ever_used_, 1); | 35 base::Relaxed_Store(&g_locker_was_ever_used_, 1); |
36 // Get the big lock if necessary. | 36 // Get the big lock if necessary. |
37 if (!isolate_->thread_manager()->IsLockedByCurrentThread()) { | 37 if (!isolate_->thread_manager()->IsLockedByCurrentThread()) { |
38 isolate_->thread_manager()->Lock(); | 38 isolate_->thread_manager()->Lock(); |
39 has_lock_ = true; | 39 has_lock_ = true; |
40 | 40 |
41 // This may be a locker within an unlocker in which case we have to | 41 // This may be a locker within an unlocker in which case we have to |
42 // get the saved state for this thread and restore it. | 42 // get the saved state for this thread and restore it. |
43 if (isolate_->thread_manager()->RestoreThread()) { | 43 if (isolate_->thread_manager()->RestoreThread()) { |
44 top_level_ = false; | 44 top_level_ = false; |
45 } else { | 45 } else { |
46 internal::ExecutionAccess access(isolate_); | 46 internal::ExecutionAccess access(isolate_); |
47 isolate_->stack_guard()->ClearThread(access); | 47 isolate_->stack_guard()->ClearThread(access); |
48 isolate_->stack_guard()->InitThread(access); | 48 isolate_->stack_guard()->InitThread(access); |
49 } | 49 } |
50 } | 50 } |
51 DCHECK(isolate_->thread_manager()->IsLockedByCurrentThread()); | 51 DCHECK(isolate_->thread_manager()->IsLockedByCurrentThread()); |
52 } | 52 } |
53 | 53 |
54 | 54 |
55 bool Locker::IsLocked(v8::Isolate* isolate) { | 55 bool Locker::IsLocked(v8::Isolate* isolate) { |
56 DCHECK(isolate != NULL); | 56 DCHECK(isolate != NULL); |
57 i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate); | 57 i::Isolate* internal_isolate = reinterpret_cast<i::Isolate*>(isolate); |
58 return internal_isolate->thread_manager()->IsLockedByCurrentThread(); | 58 return internal_isolate->thread_manager()->IsLockedByCurrentThread(); |
59 } | 59 } |
60 | 60 |
61 | 61 |
62 bool Locker::IsActive() { | 62 bool Locker::IsActive() { |
63 return !!base::NoBarrier_Load(&g_locker_was_ever_used_); | 63 return !!base::Relaxed_Load(&g_locker_was_ever_used_); |
64 } | 64 } |
65 | 65 |
66 | 66 |
67 Locker::~Locker() { | 67 Locker::~Locker() { |
68 DCHECK(isolate_->thread_manager()->IsLockedByCurrentThread()); | 68 DCHECK(isolate_->thread_manager()->IsLockedByCurrentThread()); |
69 if (has_lock_) { | 69 if (has_lock_) { |
70 if (top_level_) { | 70 if (top_level_) { |
71 isolate_->thread_manager()->FreeThreadResources(); | 71 isolate_->thread_manager()->FreeThreadResources(); |
72 } else { | 72 } else { |
73 isolate_->thread_manager()->ArchiveThread(); | 73 isolate_->thread_manager()->ArchiveThread(); |
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356 state = state->Next()) { | 356 state = state->Next()) { |
357 if (thread_id.Equals(state->id())) { | 357 if (thread_id.Equals(state->id())) { |
358 state->set_terminate_on_restore(true); | 358 state->set_terminate_on_restore(true); |
359 } | 359 } |
360 } | 360 } |
361 } | 361 } |
362 | 362 |
363 | 363 |
364 } // namespace internal | 364 } // namespace internal |
365 } // namespace v8 | 365 } // namespace v8 |
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