java_lang_Thread.cc revision 37c16453a92bbf1a47f042000318a1b60381017d
1/* 2 * Copyright (C) 2008 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#include "common_throws.h" 18#include "debugger.h" 19#include "jni_internal.h" 20#include "monitor.h" 21#include "mirror/object.h" 22#include "scoped_fast_native_object_access.h" 23#include "scoped_thread_state_change.h" 24#include "ScopedUtfChars.h" 25#include "thread.h" 26#include "thread_list.h" 27#include "verify_object-inl.h" 28 29namespace art { 30 31static jobject Thread_currentThread(JNIEnv* env, jclass) { 32 ScopedFastNativeObjectAccess soa(env); 33 return soa.AddLocalReference<jobject>(soa.Self()->GetPeer()); 34} 35 36static jboolean Thread_interrupted(JNIEnv* env, jclass) { 37 return static_cast<JNIEnvExt*>(env)->self->Interrupted() ? JNI_TRUE : JNI_FALSE; 38} 39 40static jboolean Thread_isInterrupted(JNIEnv* env, jobject java_thread) { 41 ScopedFastNativeObjectAccess soa(env); 42 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 43 Thread* thread = Thread::FromManagedThread(soa, java_thread); 44 return (thread != NULL) ? thread->IsInterrupted() : JNI_FALSE; 45} 46 47static void Thread_nativeCreate(JNIEnv* env, jclass, jobject java_thread, jlong stack_size, 48 jboolean daemon) { 49 Thread::CreateNativeThread(env, java_thread, stack_size, daemon == JNI_TRUE); 50} 51 52static jint Thread_nativeGetStatus(JNIEnv* env, jobject java_thread, jboolean has_been_started) { 53 // Ordinals from Java's Thread.State. 54 const jint kJavaNew = 0; 55 const jint kJavaRunnable = 1; 56 const jint kJavaBlocked = 2; 57 const jint kJavaWaiting = 3; 58 const jint kJavaTimedWaiting = 4; 59 const jint kJavaTerminated = 5; 60 61 ScopedObjectAccess soa(env); 62 ThreadState internal_thread_state = (has_been_started ? kTerminated : kStarting); 63 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 64 Thread* thread = Thread::FromManagedThread(soa, java_thread); 65 if (thread != NULL) { 66 internal_thread_state = thread->GetState(); 67 } 68 switch (internal_thread_state) { 69 case kTerminated: return kJavaTerminated; 70 case kRunnable: return kJavaRunnable; 71 case kTimedWaiting: return kJavaTimedWaiting; 72 case kSleeping: return kJavaTimedWaiting; 73 case kBlocked: return kJavaBlocked; 74 case kWaiting: return kJavaWaiting; 75 case kStarting: return kJavaNew; 76 case kNative: return kJavaRunnable; 77 case kWaitingForGcToComplete: return kJavaWaiting; 78 case kWaitingPerformingGc: return kJavaWaiting; 79 case kWaitingForCheckPointsToRun: return kJavaWaiting; 80 case kWaitingForDebuggerSend: return kJavaWaiting; 81 case kWaitingForDebuggerToAttach: return kJavaWaiting; 82 case kWaitingInMainDebuggerLoop: return kJavaWaiting; 83 case kWaitingForDebuggerSuspension: return kJavaWaiting; 84 case kWaitingForDeoptimization: return kJavaWaiting; 85 case kWaitingForJniOnLoad: return kJavaWaiting; 86 case kWaitingForSignalCatcherOutput: return kJavaWaiting; 87 case kWaitingInMainSignalCatcherLoop: return kJavaWaiting; 88 case kWaitingForMethodTracingStart: return kJavaWaiting; 89 case kSuspended: return kJavaRunnable; 90 // Don't add a 'default' here so the compiler can spot incompatible enum changes. 91 } 92 LOG(ERROR) << "Unexpected thread state: " << internal_thread_state; 93 return -1; // Unreachable. 94} 95 96static jboolean Thread_nativeHoldsLock(JNIEnv* env, jobject java_thread, jobject java_object) { 97 ScopedObjectAccess soa(env); 98 mirror::Object* object = soa.Decode<mirror::Object*>(java_object); 99 if (object == NULL) { 100 ThrowNullPointerException(NULL, "object == null"); 101 return JNI_FALSE; 102 } 103 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 104 Thread* thread = Thread::FromManagedThread(soa, java_thread); 105 return thread->HoldsLock(object); 106} 107 108static void Thread_nativeInterrupt(JNIEnv* env, jobject java_thread) { 109 ScopedFastNativeObjectAccess soa(env); 110 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 111 Thread* thread = Thread::FromManagedThread(soa, java_thread); 112 if (thread != NULL) { 113 thread->Interrupt(soa.Self()); 114 } 115} 116 117static void Thread_nativeSetName(JNIEnv* env, jobject peer, jstring java_name) { 118 ScopedUtfChars name(env, java_name); 119 Thread* self; 120 { 121 ScopedObjectAccess soa(env); 122 if (soa.Decode<mirror::Object*>(peer) == soa.Self()->GetPeer()) { 123 soa.Self()->SetThreadName(name.c_str()); 124 return; 125 } 126 self = soa.Self(); 127 } 128 // Suspend thread to avoid it from killing itself while we set its name. We don't just hold the 129 // thread list lock to avoid this, as setting the thread name causes mutator to lock/unlock 130 // in the DDMS send code. 131 ThreadList* thread_list = Runtime::Current()->GetThreadList(); 132 bool timed_out; 133 // Take suspend thread lock to avoid races with threads trying to suspend this one. 134 Thread* thread; 135 { 136 MutexLock mu(self, *Locks::thread_list_suspend_thread_lock_); 137 thread = thread_list->SuspendThreadByPeer(peer, true, false, &timed_out); 138 } 139 if (thread != NULL) { 140 { 141 ScopedObjectAccess soa(env); 142 thread->SetThreadName(name.c_str()); 143 } 144 thread_list->Resume(thread, false); 145 } else if (timed_out) { 146 LOG(ERROR) << "Trying to set thread name to '" << name.c_str() << "' failed as the thread " 147 "failed to suspend within a generous timeout."; 148 } 149} 150 151/* 152 * Alter the priority of the specified thread. "new_priority" will range 153 * from Thread.MIN_PRIORITY to Thread.MAX_PRIORITY (1-10), with "normal" 154 * threads at Thread.NORM_PRIORITY (5). 155 */ 156static void Thread_nativeSetPriority(JNIEnv* env, jobject java_thread, jint new_priority) { 157 ScopedObjectAccess soa(env); 158 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 159 Thread* thread = Thread::FromManagedThread(soa, java_thread); 160 if (thread != NULL) { 161 thread->SetNativePriority(new_priority); 162 } 163} 164 165static void Thread_sleep(JNIEnv* env, jclass, jobject java_lock, jlong ms, jint ns) { 166 ScopedFastNativeObjectAccess soa(env); 167 mirror::Object* lock = soa.Decode<mirror::Object*>(java_lock); 168 Monitor::Wait(Thread::Current(), lock, ms, ns, true, kSleeping); 169} 170 171/* 172 * Causes the thread to temporarily pause and allow other threads to execute. 173 * 174 * The exact behavior is poorly defined. Some discussion here: 175 * http://www.cs.umd.edu/~pugh/java/memoryModel/archive/0944.html 176 */ 177static void Thread_yield(JNIEnv*, jobject) { 178 sched_yield(); 179} 180 181static JNINativeMethod gMethods[] = { 182 NATIVE_METHOD(Thread, currentThread, "!()Ljava/lang/Thread;"), 183 NATIVE_METHOD(Thread, interrupted, "!()Z"), 184 NATIVE_METHOD(Thread, isInterrupted, "!()Z"), 185 NATIVE_METHOD(Thread, nativeCreate, "(Ljava/lang/Thread;JZ)V"), 186 NATIVE_METHOD(Thread, nativeGetStatus, "(Z)I"), 187 NATIVE_METHOD(Thread, nativeHoldsLock, "(Ljava/lang/Object;)Z"), 188 NATIVE_METHOD(Thread, nativeInterrupt, "!()V"), 189 NATIVE_METHOD(Thread, nativeSetName, "(Ljava/lang/String;)V"), 190 NATIVE_METHOD(Thread, nativeSetPriority, "(I)V"), 191 NATIVE_METHOD(Thread, sleep, "!(Ljava/lang/Object;JI)V"), 192 NATIVE_METHOD(Thread, yield, "()V"), 193}; 194 195void register_java_lang_Thread(JNIEnv* env) { 196 REGISTER_NATIVE_METHODS("java/lang/Thread"); 197} 198 199} // namespace art 200