java_lang_Thread.cc revision 4e30541a92381fb280cd0be9a1763b713ee4d64c
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 ScopedObjectAccess 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 kSuspended: return kJavaRunnable; 89 // Don't add a 'default' here so the compiler can spot incompatible enum changes. 90 } 91 return -1; // Unreachable. 92} 93 94static jboolean Thread_nativeHoldsLock(JNIEnv* env, jobject java_thread, jobject java_object) { 95 ScopedObjectAccess soa(env); 96 mirror::Object* object = soa.Decode<mirror::Object*>(java_object); 97 if (object == NULL) { 98 ThrowNullPointerException(NULL, "object == null"); 99 return JNI_FALSE; 100 } 101 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 102 Thread* thread = Thread::FromManagedThread(soa, java_thread); 103 return thread->HoldsLock(object); 104} 105 106static void Thread_nativeInterrupt(JNIEnv* env, jobject java_thread) { 107 ScopedObjectAccess soa(env); 108 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 109 Thread* thread = Thread::FromManagedThread(soa, java_thread); 110 if (thread != NULL) { 111 thread->Interrupt(); 112 } 113} 114 115static void Thread_nativeSetName(JNIEnv* env, jobject peer, jstring java_name) { 116 ScopedUtfChars name(env, java_name); 117 { 118 ScopedObjectAccess soa(env); 119 if (soa.Decode<mirror::Object*>(peer) == soa.Self()->GetPeer()) { 120 soa.Self()->SetThreadName(name.c_str()); 121 return; 122 } 123 } 124 // Suspend thread to avoid it from killing itself while we set its name. We don't just hold the 125 // thread list lock to avoid this, as setting the thread name causes mutator to lock/unlock 126 // in the DDMS send code. 127 bool timed_out; 128 Thread* thread = ThreadList::SuspendThreadByPeer(peer, true, false, &timed_out); 129 if (thread != NULL) { 130 { 131 ScopedObjectAccess soa(env); 132 thread->SetThreadName(name.c_str()); 133 } 134 Runtime::Current()->GetThreadList()->Resume(thread, false); 135 } else if (timed_out) { 136 LOG(ERROR) << "Trying to set thread name to '" << name.c_str() << "' failed as the thread " 137 "failed to suspend within a generous timeout."; 138 } 139} 140 141/* 142 * Alter the priority of the specified thread. "new_priority" will range 143 * from Thread.MIN_PRIORITY to Thread.MAX_PRIORITY (1-10), with "normal" 144 * threads at Thread.NORM_PRIORITY (5). 145 */ 146static void Thread_nativeSetPriority(JNIEnv* env, jobject java_thread, jint new_priority) { 147 ScopedObjectAccess soa(env); 148 MutexLock mu(soa.Self(), *Locks::thread_list_lock_); 149 Thread* thread = Thread::FromManagedThread(soa, java_thread); 150 if (thread != NULL) { 151 thread->SetNativePriority(new_priority); 152 } 153} 154 155static void Thread_sleep(JNIEnv* env, jclass, jobject java_lock, jlong ms, jint ns) { 156 ScopedFastNativeObjectAccess soa(env); 157 mirror::Object* lock = soa.Decode<mirror::Object*>(java_lock); 158 Monitor::Wait(Thread::Current(), lock, ms, ns, true, kSleeping); 159} 160 161/* 162 * Causes the thread to temporarily pause and allow other threads to execute. 163 * 164 * The exact behavior is poorly defined. Some discussion here: 165 * http://www.cs.umd.edu/~pugh/java/memoryModel/archive/0944.html 166 */ 167static void Thread_yield(JNIEnv*, jobject) { 168 sched_yield(); 169} 170 171static JNINativeMethod gMethods[] = { 172 NATIVE_METHOD(Thread, currentThread, "!()Ljava/lang/Thread;"), 173 NATIVE_METHOD(Thread, interrupted, "()Z"), 174 NATIVE_METHOD(Thread, isInterrupted, "()Z"), 175 NATIVE_METHOD(Thread, nativeCreate, "(Ljava/lang/Thread;JZ)V"), 176 NATIVE_METHOD(Thread, nativeGetStatus, "(Z)I"), 177 NATIVE_METHOD(Thread, nativeHoldsLock, "(Ljava/lang/Object;)Z"), 178 NATIVE_METHOD(Thread, nativeInterrupt, "()V"), 179 NATIVE_METHOD(Thread, nativeSetName, "(Ljava/lang/String;)V"), 180 NATIVE_METHOD(Thread, nativeSetPriority, "(I)V"), 181 NATIVE_METHOD(Thread, sleep, "!(Ljava/lang/Object;JI)V"), 182 NATIVE_METHOD(Thread, yield, "()V"), 183}; 184 185void register_java_lang_Thread(JNIEnv* env) { 186 REGISTER_NATIVE_METHODS("java/lang/Thread"); 187} 188 189} // namespace art 190