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