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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