1 /* 2 * Copyright (C) 2012 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 "callee_save_frame.h" 18 #include "common_throws.h" 19 #include "mirror/object-inl.h" 20 21 namespace art { 22 artLockObjectFromCode(mirror::Object * obj,Thread * self)23extern "C" int artLockObjectFromCode(mirror::Object* obj, Thread* self) 24 NO_THREAD_SAFETY_ANALYSIS 25 REQUIRES(!Roles::uninterruptible_) 26 REQUIRES_SHARED(Locks::mutator_lock_) /* EXCLUSIVE_LOCK_FUNCTION(Monitor::monitor_lock_) */ { 27 ScopedQuickEntrypointChecks sqec(self); 28 if (UNLIKELY(obj == nullptr)) { 29 ThrowNullPointerException("Null reference used for synchronization (monitor-enter)"); 30 return -1; // Failure. 31 } else { 32 ObjPtr<mirror::Object> object = obj->MonitorEnter(self); // May block 33 DCHECK(self->HoldsLock(object)); 34 // Exceptions can be thrown by monitor event listeners. This is expected to be rare however. 35 if (UNLIKELY(self->IsExceptionPending())) { 36 // TODO Remove this DCHECK if we expand the use of monitor callbacks. 37 DCHECK(Runtime::Current()->HasLoadedPlugins()) 38 << "Exceptions are only expected to be thrown by plugin code which doesn't seem to be " 39 << "loaded."; 40 // We need to get rid of the lock 41 bool unlocked = object->MonitorExit(self); 42 DCHECK(unlocked); 43 return -1; // Failure. 44 } else { 45 DCHECK(self->HoldsLock(object)); 46 return 0; // Success. 47 } 48 } 49 } 50 artUnlockObjectFromCode(mirror::Object * obj,Thread * self)51extern "C" int artUnlockObjectFromCode(mirror::Object* obj, Thread* self) 52 NO_THREAD_SAFETY_ANALYSIS 53 REQUIRES(!Roles::uninterruptible_) 54 REQUIRES_SHARED(Locks::mutator_lock_) /* UNLOCK_FUNCTION(Monitor::monitor_lock_) */ { 55 ScopedQuickEntrypointChecks sqec(self); 56 if (UNLIKELY(obj == nullptr)) { 57 ThrowNullPointerException("Null reference used for synchronization (monitor-exit)"); 58 return -1; // Failure. 59 } else { 60 // MonitorExit may throw exception. 61 return obj->MonitorExit(self) ? 0 /* Success */ : -1 /* Failure */; 62 } 63 } 64 65 } // namespace art 66