1 /* 2 * Copyright (C) 2010 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 "Configuration.h" 18 19 /** \file locks.h Mutual exclusion and condition variables */ 20 21 #ifdef USE_DEBUG 22 extern void object_lock_exclusive_(IObject *thiz, const char *file, int line); 23 extern void object_unlock_exclusive_(IObject *thiz, const char *file, int line); 24 extern void object_unlock_exclusive_attributes_(IObject *thiz, unsigned attr, 25 const char *file, int line); 26 extern void object_cond_wait_(IObject *thiz, const char *file, int line); 27 #else 28 extern void object_lock_exclusive(IObject *thiz); 29 extern void object_unlock_exclusive(IObject *thiz); 30 extern void object_unlock_exclusive_attributes(IObject *thiz, unsigned attr); 31 extern void object_cond_wait(IObject *thiz); 32 #endif 33 extern void object_cond_signal(IObject *thiz); 34 extern void object_cond_broadcast(IObject *thiz); 35 36 #ifdef USE_DEBUG 37 #define object_lock_exclusive(thiz) object_lock_exclusive_((thiz), __FILE__, __LINE__) 38 #define object_unlock_exclusive(thiz) object_unlock_exclusive_((thiz), __FILE__, __LINE__) 39 #define object_unlock_exclusive_attributes(thiz, attr) \ 40 object_unlock_exclusive_attributes_((thiz), (attr), __FILE__, __LINE__) 41 #define object_cond_wait(thiz) object_cond_wait_((thiz), __FILE__, __LINE__) 42 #endif 43 44 // Currently shared locks are implemented as exclusive, but don't count on it 45 46 #define object_lock_shared(thiz) object_lock_exclusive(thiz) 47 #define object_unlock_shared(thiz) object_unlock_exclusive(thiz) 48 49 // Currently interface locks are actually on whole object, but don't count on it. 50 // These operations are undefined on IObject, as it lacks an mThis. 51 // If you have an IObject, then use the object_ functions instead. 52 53 #define interface_lock_exclusive(thiz) object_lock_exclusive(InterfaceToIObject(thiz)) 54 #define interface_unlock_exclusive(thiz) object_unlock_exclusive(InterfaceToIObject(thiz)) 55 #define interface_unlock_exclusive_attributes(thiz, attr) \ 56 object_unlock_exclusive_attributes(InterfaceToIObject(thiz), (attr)) 57 #define interface_lock_shared(thiz) object_lock_shared(InterfaceToIObject(thiz)) 58 #define interface_unlock_shared(thiz) object_unlock_shared(InterfaceToIObject(thiz)) 59 #define interface_cond_wait(thiz) object_cond_wait(InterfaceToIObject(thiz)) 60 #define interface_cond_signal(thiz) object_cond_signal(InterfaceToIObject(thiz)) 61 #define interface_cond_broadcast(thiz) object_cond_broadcast(InterfaceToIObject(thiz)) 62 63 // Peek and poke are an optimization for small atomic fields that don't "matter". 64 // Don't use for struct, as struct copy might not be atomic. 65 // On uniprocessor they can be no-ops, on SMP they could be memory barriers but locks are easier. 66 67 #define object_lock_peek(thiz) object_lock_shared(thiz) 68 #define object_unlock_peek(thiz) object_unlock_shared(thiz) 69 #define interface_lock_poke(thiz) interface_lock_exclusive(thiz) 70 #define interface_unlock_poke(thiz) interface_unlock_exclusive(thiz) 71 #define interface_lock_peek(thiz) interface_lock_shared(thiz) 72 #define interface_unlock_peek(thiz) interface_unlock_shared(thiz) 73