1 /*
2 * Copyright (C) 2012 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #ifndef ART_RUNTIME_SCOPED_THREAD_STATE_CHANGE_INL_H_
18 #define ART_RUNTIME_SCOPED_THREAD_STATE_CHANGE_INL_H_
19
20 #include "scoped_thread_state_change.h"
21
22 #include <android-base/logging.h>
23
24 #include "base/casts.h"
25 #include "base/mutex.h"
26 #include "jni/jni_env_ext-inl.h"
27 #include "obj_ptr-inl.h"
28 #include "runtime.h"
29 #include "thread-inl.h"
30
31 namespace art {
32
ScopedThreadStateChange(Thread * self,ThreadState new_thread_state)33 inline ScopedThreadStateChange::ScopedThreadStateChange(Thread* self, ThreadState new_thread_state)
34 : self_(self), thread_state_(new_thread_state), expected_has_no_thread_(false) {
35 if (UNLIKELY(self_ == nullptr)) {
36 // Value chosen arbitrarily and won't be used in the destructor since thread_ == null.
37 old_thread_state_ = kTerminated;
38 Runtime* runtime = Runtime::Current();
39 CHECK(runtime == nullptr || !runtime->IsStarted() || runtime->IsShuttingDown(self_));
40 } else {
41 DCHECK_EQ(self, Thread::Current());
42 // Read state without locks, ok as state is effectively thread local and we're not interested
43 // in the suspend count (this will be handled in the runnable transitions).
44 old_thread_state_ = self->GetState();
45 if (old_thread_state_ != new_thread_state) {
46 if (new_thread_state == kRunnable) {
47 self_->TransitionFromSuspendedToRunnable();
48 } else if (old_thread_state_ == kRunnable) {
49 self_->TransitionFromRunnableToSuspended(new_thread_state);
50 } else {
51 // A suspended transition to another effectively suspended transition, ok to use Unsafe.
52 self_->SetState(new_thread_state);
53 }
54 }
55 }
56 }
57
~ScopedThreadStateChange()58 inline ScopedThreadStateChange::~ScopedThreadStateChange() {
59 if (UNLIKELY(self_ == nullptr)) {
60 ScopedThreadChangeDestructorCheck();
61 } else {
62 if (old_thread_state_ != thread_state_) {
63 if (old_thread_state_ == kRunnable) {
64 self_->TransitionFromSuspendedToRunnable();
65 } else if (thread_state_ == kRunnable) {
66 self_->TransitionFromRunnableToSuspended(old_thread_state_);
67 } else {
68 // A suspended transition to another effectively suspended transition, ok to use Unsafe.
69 self_->SetState(old_thread_state_);
70 }
71 }
72 }
73 }
74
75 template<typename T>
AddLocalReference(ObjPtr<mirror::Object> obj)76 inline T ScopedObjectAccessAlreadyRunnable::AddLocalReference(ObjPtr<mirror::Object> obj) const {
77 Locks::mutator_lock_->AssertSharedHeld(Self());
78 if (kIsDebugBuild) {
79 CHECK(IsRunnable()); // Don't work with raw objects in non-runnable states.
80 DCheckObjIsNotClearedJniWeakGlobal(obj);
81 }
82 return obj == nullptr ? nullptr : Env()->AddLocalReference<T>(obj);
83 }
84
85 template<typename T>
Decode(jobject obj)86 inline ObjPtr<T> ScopedObjectAccessAlreadyRunnable::Decode(jobject obj) const {
87 Locks::mutator_lock_->AssertSharedHeld(Self());
88 DCHECK(IsRunnable()); // Don't work with raw objects in non-runnable states.
89 return ObjPtr<T>::DownCast(Self()->DecodeJObject(obj));
90 }
91
IsRunnable()92 inline bool ScopedObjectAccessAlreadyRunnable::IsRunnable() const {
93 return self_->GetState() == kRunnable;
94 }
95
ScopedObjectAccessAlreadyRunnable(JNIEnv * env)96 inline ScopedObjectAccessAlreadyRunnable::ScopedObjectAccessAlreadyRunnable(JNIEnv* env)
97 : self_(ThreadForEnv(env)), env_(down_cast<JNIEnvExt*>(env)), vm_(env_->GetVm()) {}
98
ScopedObjectAccessAlreadyRunnable(Thread * self)99 inline ScopedObjectAccessAlreadyRunnable::ScopedObjectAccessAlreadyRunnable(Thread* self)
100 : self_(self),
101 env_(down_cast<JNIEnvExt*>(self->GetJniEnv())),
102 vm_(env_ != nullptr ? env_->GetVm() : nullptr) {}
103
ScopedObjectAccessUnchecked(JNIEnv * env)104 inline ScopedObjectAccessUnchecked::ScopedObjectAccessUnchecked(JNIEnv* env)
105 : ScopedObjectAccessAlreadyRunnable(env), tsc_(Self(), kRunnable) {
106 Self()->VerifyStack();
107 Locks::mutator_lock_->AssertSharedHeld(Self());
108 }
109
ScopedObjectAccessUnchecked(Thread * self)110 inline ScopedObjectAccessUnchecked::ScopedObjectAccessUnchecked(Thread* self)
111 : ScopedObjectAccessAlreadyRunnable(self), tsc_(self, kRunnable) {
112 Self()->VerifyStack();
113 Locks::mutator_lock_->AssertSharedHeld(Self());
114 }
115
ScopedObjectAccess(JNIEnv * env)116 inline ScopedObjectAccess::ScopedObjectAccess(JNIEnv* env) : ScopedObjectAccessUnchecked(env) {}
ScopedObjectAccess(Thread * self)117 inline ScopedObjectAccess::ScopedObjectAccess(Thread* self) : ScopedObjectAccessUnchecked(self) {}
~ScopedObjectAccess()118 inline ScopedObjectAccess::~ScopedObjectAccess() {}
119
ScopedThreadSuspension(Thread * self,ThreadState suspended_state)120 inline ScopedThreadSuspension::ScopedThreadSuspension(Thread* self, ThreadState suspended_state)
121 : self_(self), suspended_state_(suspended_state) {
122 DCHECK(self_ != nullptr);
123 self_->TransitionFromRunnableToSuspended(suspended_state);
124 }
125
~ScopedThreadSuspension()126 inline ScopedThreadSuspension::~ScopedThreadSuspension() {
127 DCHECK_EQ(self_->GetState(), suspended_state_);
128 self_->TransitionFromSuspendedToRunnable();
129 }
130
131 } // namespace art
132
133 #endif // ART_RUNTIME_SCOPED_THREAD_STATE_CHANGE_INL_H_
134