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