| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include "java_lang_Thread.h" |
| |
| #include "common_throws.h" |
| #include "jni/jni_internal.h" |
| #include "mirror/object.h" |
| #include "monitor.h" |
| #include "native_util.h" |
| #include "nativehelper/jni_macros.h" |
| #include "nativehelper/scoped_utf_chars.h" |
| #include "scoped_fast_native_object_access-inl.h" |
| #include "scoped_thread_state_change-inl.h" |
| #include "thread.h" |
| #include "thread_list.h" |
| #include "verify_object.h" |
| |
| namespace art { |
| |
| static jobject Thread_currentThread(JNIEnv* env, jclass) { |
| ScopedFastNativeObjectAccess soa(env); |
| return soa.AddLocalReference<jobject>(soa.Self()->GetPeer()); |
| } |
| |
| static jboolean Thread_interrupted(JNIEnv* env, jclass) { |
| return static_cast<JNIEnvExt*>(env)->GetSelf()->Interrupted() ? JNI_TRUE : JNI_FALSE; |
| } |
| |
| static jboolean Thread_isInterrupted(JNIEnv* env, jobject java_thread) { |
| ScopedFastNativeObjectAccess soa(env); |
| MutexLock mu(soa.Self(), *Locks::thread_list_lock_); |
| Thread* thread = Thread::FromManagedThread(soa, java_thread); |
| return (thread != nullptr) ? thread->IsInterrupted() : JNI_FALSE; |
| } |
| |
| static void Thread_nativeCreate(JNIEnv* env, jclass, jobject java_thread, jlong stack_size, |
| jboolean daemon) { |
| // There are sections in the zygote that forbid thread creation. |
| Runtime* runtime = Runtime::Current(); |
| if (runtime->IsZygote() && runtime->IsZygoteNoThreadSection()) { |
| jclass internal_error = env->FindClass("java/lang/InternalError"); |
| CHECK(internal_error != nullptr); |
| env->ThrowNew(internal_error, "Cannot create threads in zygote"); |
| return; |
| } |
| |
| Thread::CreateNativeThread(env, java_thread, stack_size, daemon == JNI_TRUE); |
| } |
| |
| static jint Thread_nativeGetStatus(JNIEnv* env, jobject java_thread, jboolean has_been_started) { |
| // Ordinals from Java's Thread.State. |
| const jint kJavaNew = 0; |
| const jint kJavaRunnable = 1; |
| const jint kJavaBlocked = 2; |
| const jint kJavaWaiting = 3; |
| const jint kJavaTimedWaiting = 4; |
| const jint kJavaTerminated = 5; |
| |
| ScopedObjectAccess soa(env); |
| ThreadState internal_thread_state = (has_been_started ? kTerminated : kStarting); |
| MutexLock mu(soa.Self(), *Locks::thread_list_lock_); |
| Thread* thread = Thread::FromManagedThread(soa, java_thread); |
| if (thread != nullptr) { |
| internal_thread_state = thread->GetState(); |
| } |
| switch (internal_thread_state) { |
| case kTerminated: return kJavaTerminated; |
| case kRunnable: return kJavaRunnable; |
| case kTimedWaiting: return kJavaTimedWaiting; |
| case kSleeping: return kJavaTimedWaiting; |
| case kBlocked: return kJavaBlocked; |
| case kWaiting: return kJavaWaiting; |
| case kStarting: return kJavaNew; |
| case kNative: return kJavaRunnable; |
| case kWaitingForTaskProcessor: return kJavaWaiting; |
| case kWaitingForLockInflation: return kJavaWaiting; |
| case kWaitingForGcToComplete: return kJavaWaiting; |
| case kWaitingPerformingGc: return kJavaWaiting; |
| case kWaitingForCheckPointsToRun: return kJavaWaiting; |
| case kWaitingForDebuggerSend: return kJavaWaiting; |
| case kWaitingForDebuggerToAttach: return kJavaWaiting; |
| case kWaitingInMainDebuggerLoop: return kJavaWaiting; |
| case kWaitingForDebuggerSuspension: return kJavaWaiting; |
| case kWaitingForDeoptimization: return kJavaWaiting; |
| case kWaitingForGetObjectsAllocated: return kJavaWaiting; |
| case kWaitingForJniOnLoad: return kJavaWaiting; |
| case kWaitingForSignalCatcherOutput: return kJavaWaiting; |
| case kWaitingInMainSignalCatcherLoop: return kJavaWaiting; |
| case kWaitingForMethodTracingStart: return kJavaWaiting; |
| case kWaitingForVisitObjects: return kJavaWaiting; |
| case kWaitingWeakGcRootRead: return kJavaRunnable; |
| case kWaitingForGcThreadFlip: return kJavaWaiting; |
| case kSuspended: return kJavaRunnable; |
| // Don't add a 'default' here so the compiler can spot incompatible enum changes. |
| } |
| LOG(ERROR) << "Unexpected thread state: " << internal_thread_state; |
| return -1; // Unreachable. |
| } |
| |
| static jboolean Thread_holdsLock(JNIEnv* env, jclass, jobject java_object) { |
| ScopedObjectAccess soa(env); |
| ObjPtr<mirror::Object> object = soa.Decode<mirror::Object>(java_object); |
| if (object == nullptr) { |
| ThrowNullPointerException("object == null"); |
| return JNI_FALSE; |
| } |
| Thread* thread = soa.Self(); |
| return thread->HoldsLock(object); |
| } |
| |
| static void Thread_interrupt0(JNIEnv* env, jobject java_thread) { |
| ScopedFastNativeObjectAccess soa(env); |
| MutexLock mu(soa.Self(), *Locks::thread_list_lock_); |
| Thread* thread = Thread::FromManagedThread(soa, java_thread); |
| if (thread != nullptr) { |
| thread->Interrupt(soa.Self()); |
| } |
| } |
| |
| static void Thread_setNativeName(JNIEnv* env, jobject peer, jstring java_name) { |
| ScopedUtfChars name(env, java_name); |
| { |
| ScopedObjectAccess soa(env); |
| if (soa.Decode<mirror::Object>(peer) == soa.Self()->GetPeer()) { |
| soa.Self()->SetThreadName(name.c_str()); |
| return; |
| } |
| } |
| // Suspend thread to avoid it from killing itself while we set its name. We don't just hold the |
| // thread list lock to avoid this, as setting the thread name causes mutator to lock/unlock |
| // in the DDMS send code. |
| ThreadList* thread_list = Runtime::Current()->GetThreadList(); |
| bool timed_out; |
| // Take suspend thread lock to avoid races with threads trying to suspend this one. |
| Thread* thread = thread_list->SuspendThreadByPeer(peer, |
| /* request_suspension */ true, |
| SuspendReason::kInternal, |
| &timed_out); |
| if (thread != nullptr) { |
| { |
| ScopedObjectAccess soa(env); |
| thread->SetThreadName(name.c_str()); |
| } |
| bool resumed = thread_list->Resume(thread, SuspendReason::kInternal); |
| DCHECK(resumed); |
| } else if (timed_out) { |
| LOG(ERROR) << "Trying to set thread name to '" << name.c_str() << "' failed as the thread " |
| "failed to suspend within a generous timeout."; |
| } |
| } |
| |
| /* |
| * Alter the priority of the specified thread. "new_priority" will range |
| * from Thread.MIN_PRIORITY to Thread.MAX_PRIORITY (1-10), with "normal" |
| * threads at Thread.NORM_PRIORITY (5). |
| */ |
| static void Thread_setPriority0(JNIEnv* env, jobject java_thread, jint new_priority) { |
| ScopedObjectAccess soa(env); |
| MutexLock mu(soa.Self(), *Locks::thread_list_lock_); |
| Thread* thread = Thread::FromManagedThread(soa, java_thread); |
| if (thread != nullptr) { |
| thread->SetNativePriority(new_priority); |
| } |
| } |
| |
| static void Thread_sleep(JNIEnv* env, jclass, jobject java_lock, jlong ms, jint ns) { |
| ScopedFastNativeObjectAccess soa(env); |
| ObjPtr<mirror::Object> lock = soa.Decode<mirror::Object>(java_lock); |
| Monitor::Wait(Thread::Current(), lock.Ptr(), ms, ns, true, kSleeping); |
| } |
| |
| /* |
| * Causes the thread to temporarily pause and allow other threads to execute. |
| * |
| * The exact behavior is poorly defined. Some discussion here: |
| * http://www.cs.umd.edu/~pugh/java/memoryModel/archive/0944.html |
| */ |
| static void Thread_yield(JNIEnv*, jobject) { |
| sched_yield(); |
| } |
| |
| static JNINativeMethod gMethods[] = { |
| FAST_NATIVE_METHOD(Thread, currentThread, "()Ljava/lang/Thread;"), |
| FAST_NATIVE_METHOD(Thread, interrupted, "()Z"), |
| FAST_NATIVE_METHOD(Thread, isInterrupted, "()Z"), |
| NATIVE_METHOD(Thread, nativeCreate, "(Ljava/lang/Thread;JZ)V"), |
| NATIVE_METHOD(Thread, nativeGetStatus, "(Z)I"), |
| NATIVE_METHOD(Thread, holdsLock, "(Ljava/lang/Object;)Z"), |
| FAST_NATIVE_METHOD(Thread, interrupt0, "()V"), |
| NATIVE_METHOD(Thread, setNativeName, "(Ljava/lang/String;)V"), |
| NATIVE_METHOD(Thread, setPriority0, "(I)V"), |
| FAST_NATIVE_METHOD(Thread, sleep, "(Ljava/lang/Object;JI)V"), |
| NATIVE_METHOD(Thread, yield, "()V"), |
| }; |
| |
| void register_java_lang_Thread(JNIEnv* env) { |
| REGISTER_NATIVE_METHODS("java/lang/Thread"); |
| } |
| |
| } // namespace art |