locks.h revision 5c8bd83295b2752bb7ac34f83dfb19dcdb1be5e5
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 20extern void object_lock_exclusive_(IObject *this, const char *file, int line); 21extern void object_unlock_exclusive_(IObject *this, const char *file, int line); 22extern void object_unlock_exclusive_attributes_(IObject *this, unsigned attr, 23 const char *file, int line); 24extern void object_cond_wait_(IObject *this, const char *file, int line); 25#else 26extern void object_lock_exclusive(IObject *this); 27extern void object_unlock_exclusive(IObject *this); 28extern void object_unlock_exclusive_attributes(IObject *this, unsigned attr); 29extern void object_cond_wait(IObject *this); 30#endif 31extern void object_cond_signal(IObject *this); 32extern void object_cond_broadcast(IObject *this); 33 34#ifdef USE_DEBUG 35#define object_lock_exclusive(this) object_lock_exclusive_((this), __FILE__, __LINE__) 36#define object_unlock_exclusive(this) object_unlock_exclusive_((this), __FILE__, __LINE__) 37#define object_unlock_exclusive_attributes(this, attr) \ 38 object_unlock_exclusive_attributes_((this), (attr), __FILE__, __LINE__) 39#define object_cond_wait(this) object_cond_wait_((this), __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(this) object_lock_exclusive(this) 45#define object_unlock_shared(this) object_unlock_exclusive(this) 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(this) object_lock_exclusive(InterfaceToIObject(this)) 52#define interface_unlock_exclusive(this) object_unlock_exclusive(InterfaceToIObject(this)) 53#define interface_unlock_exclusive_attributes(this, attr) \ 54 object_unlock_exclusive_attributes(InterfaceToIObject(this), (attr)) 55#define interface_lock_shared(this) object_lock_shared(InterfaceToIObject(this)) 56#define interface_unlock_shared(this) object_unlock_shared(InterfaceToIObject(this)) 57#define interface_cond_wait(this) object_cond_wait(InterfaceToIObject(this)) 58#define interface_cond_signal(this) object_cond_signal(InterfaceToIObject(this)) 59#define interface_cond_broadcast(this) object_cond_broadcast(InterfaceToIObject(this)) 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(this) object_lock_shared(this) 66#define object_unlock_peek(this) object_unlock_shared(this) 67#define interface_lock_poke(this) interface_lock_exclusive(this) 68#define interface_unlock_poke(this) interface_unlock_exclusive(this) 69#define interface_lock_peek(this) interface_lock_shared(this) 70#define interface_unlock_peek(this) interface_unlock_shared(this) 71