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Diffstat (limited to 'runtime/native/java_lang_Thread.cc')
| -rw-r--r-- | runtime/native/java_lang_Thread.cc | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/runtime/native/java_lang_Thread.cc b/runtime/native/java_lang_Thread.cc new file mode 100644 index 0000000000..8ef190aa3f --- /dev/null +++ b/runtime/native/java_lang_Thread.cc @@ -0,0 +1,186 @@ +/* + * 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 "common_throws.h" +#include "debugger.h" +#include "jni_internal.h" +#include "monitor.h" +#include "mirror/object.h" +#include "scoped_thread_state_change.h" +#include "ScopedUtfChars.h" +#include "thread.h" +#include "thread_list.h" + +namespace art { + +static jobject Thread_currentThread(JNIEnv* env, jclass) { + ScopedObjectAccess soa(env); + return soa.AddLocalReference<jobject>(soa.Self()->GetPeer()); +} + +static jboolean Thread_interrupted(JNIEnv* env, jclass) { + return static_cast<JNIEnvExt*>(env)->self->Interrupted() ? JNI_TRUE : JNI_FALSE; +} + +static jboolean Thread_isInterrupted(JNIEnv* env, jobject java_thread) { + ScopedObjectAccess soa(env); + MutexLock mu(soa.Self(), *Locks::thread_list_lock_); + Thread* thread = Thread::FromManagedThread(soa, java_thread); + return (thread != NULL) ? thread->IsInterrupted() : JNI_FALSE; +} + +static void Thread_nativeCreate(JNIEnv* env, jclass, jobject java_thread, jlong stack_size, + jboolean daemon) { + 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 != NULL) { + 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 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 kWaitingForJniOnLoad: return kJavaWaiting; + case kWaitingForSignalCatcherOutput: return kJavaWaiting; + case kWaitingInMainSignalCatcherLoop: return kJavaWaiting; + case kSuspended: return kJavaRunnable; + // Don't add a 'default' here so the compiler can spot incompatible enum changes. + } + return -1; // Unreachable. +} + +static jboolean Thread_nativeHoldsLock(JNIEnv* env, jobject java_thread, jobject java_object) { + ScopedObjectAccess soa(env); + mirror::Object* object = soa.Decode<mirror::Object*>(java_object); + if (object == NULL) { + ThrowNullPointerException(NULL, "object == null"); + return JNI_FALSE; + } + MutexLock mu(soa.Self(), *Locks::thread_list_lock_); + Thread* thread = Thread::FromManagedThread(soa, java_thread); + return thread->HoldsLock(object); +} + +static void Thread_nativeInterrupt(JNIEnv* env, jobject java_thread) { + ScopedObjectAccess soa(env); + MutexLock mu(soa.Self(), *Locks::thread_list_lock_); + Thread* thread = Thread::FromManagedThread(soa, java_thread); + if (thread != NULL) { + thread->Interrupt(); + } +} + +static void Thread_nativeSetName(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. + bool timed_out; + Thread* thread = Thread::SuspendForDebugger(peer, true, &timed_out); + if (thread != NULL) { + { + ScopedObjectAccess soa(env); + thread->SetThreadName(name.c_str()); + } + Runtime::Current()->GetThreadList()->Resume(thread, true); + } 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_nativeSetPriority(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 != NULL) { + thread->SetNativePriority(new_priority); + } +} + +static void Thread_sleep(JNIEnv* env, jclass, jobject java_lock, jlong ms, jint ns) { + ScopedObjectAccess soa(env); + mirror::Object* lock = soa.Decode<mirror::Object*>(java_lock); + Monitor::Wait(Thread::Current(), lock, 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[] = { + NATIVE_METHOD(Thread, currentThread, "()Ljava/lang/Thread;"), + NATIVE_METHOD(Thread, interrupted, "()Z"), + NATIVE_METHOD(Thread, isInterrupted, "()Z"), + NATIVE_METHOD(Thread, nativeCreate, "(Ljava/lang/Thread;JZ)V"), + NATIVE_METHOD(Thread, nativeGetStatus, "(Z)I"), + NATIVE_METHOD(Thread, nativeHoldsLock, "(Ljava/lang/Object;)Z"), + NATIVE_METHOD(Thread, nativeInterrupt, "()V"), + NATIVE_METHOD(Thread, nativeSetName, "(Ljava/lang/String;)V"), + NATIVE_METHOD(Thread, nativeSetPriority, "(I)V"), + 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 |