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