1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
|
#include "JSONNode.h"
#include "../JSONOptions.h"
#ifdef JSON_MUTEX_CALLBACKS
json_mutex_callback_t json_lock_callback = 0;
json_mutex_callback_t json_unlock_callback = 0;
void * global_mutex = 0;
void * manager_mutex = 0;
struct AutoLock {
AutoLock(void){
json_lock_callback(manager_mutex);
}
~AutoLock(void){
json_unlock_callback(manager_mutex);
}
};
#include <map>
#ifdef JSON_MUTEX_MANAGE
json_mutex_callback_t json_destroy = 0;
std::map<void *, unsigned int> mutex_manager;
//make sure that the global mutex is taken care of too
struct auto_global {
auto_global(void){}
~auto_global(void){
if (global_mutex){
JSON_ASSERT_SAFE(json_destroy, JSON_TEXT("No json_destroy in mutex managed mode"), return;);
json_destroy(global_mutex);
}
}
};
auto_global cleanupGlobal;
#endif
void JSONNode::register_mutex_callbacks(json_mutex_callback_t lock, json_mutex_callback_t unlock, void * manager_lock){
json_lock_callback = lock;
json_unlock_callback = unlock;
manager_mutex = manager_lock;
}
void JSONNode::set_global_mutex(void * mutex){
global_mutex = mutex;
}
void JSONNode::set_mutex(void * mutex){
makeUniqueInternal();
internal -> _set_mutex(mutex);
}
std::map<int, std::map<void *, unsigned int> > threadlocks;
void * JSONNode::getThisLock(JSONNode * pthis){
if (pthis -> internal -> mylock){
return pthis -> internal -> mylock;
}
JSON_ASSERT_SAFE(global_mutex, JSON_TEXT("No global_mutex"), return 0;);
return global_mutex;
}
void JSONNode::lock(int thread){
JSON_ASSERT_SAFE(json_lock_callback, JSON_TEXT("No locking callback"), return;);
AutoLock lockControl;
//first, figure out what needs to be locked
void * thislock = getThisLock(this);
#ifdef JSON_SAFE
if (!thislock) return;
#endif
//make sure that the same thread isn't locking it more than once (possible due to complex ref counting)
std::map<int, std::map<void *, unsigned int> >::iterator it = threadlocks.find(thread);
if (it == threadlocks.end()) {
std::map<void *, unsigned int> newthread;
newthread[thislock] = 1;
threadlocks.insert(std::pair<int, std::map<void *, unsigned int> >(thread, newthread));
} else { //this thread already has some things locked, check if the current mutex is
std::map<void *, unsigned int> & newthread = it -> second;
std::map<void *, unsigned int>::iterator locker = newthread.find(thislock);
if (locker == newthread.end()) { //current mutex is not locked, set it to locked
newthread.insert(std::pair<void *, unsigned int>(thislock, 1));
} else { //it's already locked, don't relock it
++(locker -> second);
return; //don't try to relock, it will deadlock the program
}
}
//if I need to, lock it
json_lock_callback(thislock);
}
void JSONNode::unlock(int thread){
JSON_ASSERT_SAFE(json_unlock_callback, JSON_TEXT("No unlocking callback"), return;);
AutoLock lockControl;
//first, figure out what needs to be locked
void * thislock = getThisLock(this);
#ifdef JSON_SAFE
if (!thislock) return;
#endif
//get it out of the map
std::map<int, std::map<void *, unsigned int> >::iterator it = threadlocks.find(thread);
JSON_ASSERT_SAFE(it != threadlocks.end(), JSON_TEXT("thread unlocking something it didn't lock"), return;);
//get the mutex out of the thread
std::map<void *, unsigned int> & newthread = it -> second;
std::map<void *, unsigned int>::iterator locker = newthread.find(thislock);
JSON_ASSERT_SAFE(locker != newthread.end(), JSON_TEXT("thread unlocking mutex it didn't lock"), return;);
//unlock it
if (--(locker -> second)) return; //other nodes is this same thread still have a lock on it
//if I need to, unlock it
newthread.erase(locker);
json_unlock_callback(thislock);
}
#ifdef JSON_MUTEX_MANAGE
void JSONNode::register_mutex_destructor(json_mutex_callback_t destroy){
json_destroy = destroy;
}
#endif
void internalJSONNode::_set_mutex(void * mutex, bool unset){
if (unset) _unset_mutex(); //for reference counting
mylock = mutex;
if (mutex){
#ifdef JSON_MUTEX_MANAGE
std::map<void *, unsigned int>::iterator it = mutex_manager.find(mutex);
if (it == mutex_manager.end()) {
mutex_manager.insert(std::pair<void *, unsigned int>(mutex, 1));
} else {
++it -> second;
}
#endif
json_foreach(Children, myrunner){
(*myrunner) -> set_mutex(mutex);
}
}
}
void internalJSONNode::_unset_mutex(void){
#ifdef JSON_MUTEX_MANAGE
if (mylock){
std::map<void *, unsigned int>::iterator it = mutex_manager.find(mylock);
JSON_ASSERT_SAFE(it != mutex_manager.end(), JSON_TEXT("Mutex not managed"), return;);
--it -> second;
if (it -> second == 0){
JSON_ASSERT_SAFE(json_destroy, JSON_TEXT("You didn't register a destructor for mutexes"), return;);
mutex_manager.erase(it);
}
}
#endif
}
#ifdef JSON_DEBUG
#ifndef JSON_LIBRARY
JSONNode internalJSONNode::DumpMutex(void) const {
JSONNode mut(JSON_NODE);
mut.set_name(JSON_TEXT("mylock"));
#ifdef JSON_MUTEX_MANAGE
if (mylock){
mut.push_back(JSON_NEW(JSONNode(JSON_TEXT("this"), (long)mylock)));
std::map<void *, unsigned int>::iterator it = mutex_manager.find(mylock);
if (it == mutex_manager.end()) {
mut.push_back(JSON_NEW(JSONNode(JSON_TEXT("references"), JSON_TEXT("error"))));
} else {
mut.push_back(JSON_NEW(JSONNode(JSON_TEXT("references"), it -> second)));
}
} else {
mut = (long)mylock;
}
#else
mut = (long)mylock;
#endif
return mut;
}
#endif
#endif
#else
#ifdef JSON_MUTEX_MANAGE
#error You can not have JSON_MUTEX_MANAGE on without JSON_MUTEX_CALLBACKS
#endif
#endif
|
