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 if (!expected_has_no_thread_) {
61 Runtime* runtime = Runtime::Current();
62 bool shutting_down = (runtime == nullptr) || runtime->IsShuttingDown(nullptr);
63 CHECK(shutting_down);
64 }
65 } else {
66 if (old_thread_state_ != thread_state_) {
67 if (old_thread_state_ == kRunnable) {
68 self_->TransitionFromSuspendedToRunnable();
69 } else if (thread_state_ == kRunnable) {
70 self_->TransitionFromRunnableToSuspended(old_thread_state_);
71 } else {
72 // A suspended transition to another effectively suspended transition, ok to use Unsafe.
73 self_->SetState(old_thread_state_);
74 }
75 }
76 }
77 }
78
79 template<typename T>
AddLocalReference(ObjPtr<mirror::Object> obj)80 inline T ScopedObjectAccessAlreadyRunnable::AddLocalReference(ObjPtr<mirror::Object> obj) const {
81 Locks::mutator_lock_->AssertSharedHeld(Self());
82 if (kIsDebugBuild) {
83 CHECK(IsRunnable()); // Don't work with raw objects in non-runnable states.
84 DCheckObjIsNotClearedJniWeakGlobal(obj);
85 }
86 return obj == nullptr ? nullptr : Env()->AddLocalReference<T>(obj);
87 }
88
89 template<typename T>
Decode(jobject obj)90 inline ObjPtr<T> ScopedObjectAccessAlreadyRunnable::Decode(jobject obj) const {
91 Locks::mutator_lock_->AssertSharedHeld(Self());
92 DCHECK(IsRunnable()); // Don't work with raw objects in non-runnable states.
93 return ObjPtr<T>::DownCast(Self()->DecodeJObject(obj));
94 }
95
IsRunnable()96 inline bool ScopedObjectAccessAlreadyRunnable::IsRunnable() const {
97 return self_->GetState() == kRunnable;
98 }
99
ScopedObjectAccessAlreadyRunnable(JNIEnv * env)100 inline ScopedObjectAccessAlreadyRunnable::ScopedObjectAccessAlreadyRunnable(JNIEnv* env)
101 : self_(ThreadForEnv(env)), env_(down_cast<JNIEnvExt*>(env)), vm_(env_->GetVm()) {}
102
ScopedObjectAccessAlreadyRunnable(Thread * self)103 inline ScopedObjectAccessAlreadyRunnable::ScopedObjectAccessAlreadyRunnable(Thread* self)
104 : self_(self),
105 env_(down_cast<JNIEnvExt*>(self->GetJniEnv())),
106 vm_(env_ != nullptr ? env_->GetVm() : nullptr) {}
107
ScopedObjectAccessUnchecked(JNIEnv * env)108 inline ScopedObjectAccessUnchecked::ScopedObjectAccessUnchecked(JNIEnv* env)
109 : ScopedObjectAccessAlreadyRunnable(env), tsc_(Self(), kRunnable) {
110 Self()->VerifyStack();
111 Locks::mutator_lock_->AssertSharedHeld(Self());
112 }
113
ScopedObjectAccessUnchecked(Thread * self)114 inline ScopedObjectAccessUnchecked::ScopedObjectAccessUnchecked(Thread* self)
115 : ScopedObjectAccessAlreadyRunnable(self), tsc_(self, kRunnable) {
116 Self()->VerifyStack();
117 Locks::mutator_lock_->AssertSharedHeld(Self());
118 }
119
ScopedObjectAccess(JNIEnv * env)120 inline ScopedObjectAccess::ScopedObjectAccess(JNIEnv* env) : ScopedObjectAccessUnchecked(env) {}
ScopedObjectAccess(Thread * self)121 inline ScopedObjectAccess::ScopedObjectAccess(Thread* self) : ScopedObjectAccessUnchecked(self) {}
~ScopedObjectAccess()122 inline ScopedObjectAccess::~ScopedObjectAccess() {}
123
ScopedThreadSuspension(Thread * self,ThreadState suspended_state)124 inline ScopedThreadSuspension::ScopedThreadSuspension(Thread* self, ThreadState suspended_state)
125 : self_(self), suspended_state_(suspended_state) {
126 DCHECK(self_ != nullptr);
127 self_->TransitionFromRunnableToSuspended(suspended_state);
128 }
129
~ScopedThreadSuspension()130 inline ScopedThreadSuspension::~ScopedThreadSuspension() {
131 DCHECK_EQ(self_->GetState(), suspended_state_);
132 self_->TransitionFromSuspendedToRunnable();
133 }
134
135 } // namespace art
136
137 #endif // ART_RUNTIME_SCOPED_THREAD_STATE_CHANGE_INL_H_
138