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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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