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/*
Miranda NG: the free IM client for Microsoft* Windows*
Copyright (ñ) 2012-15 Miranda NG project (http://miranda-ng.org),
Copyright (c) 2000-12 Miranda IM project,
all portions of this codebase are copyrighted to the people
listed in contributors.txt.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
#include "stdafx.h"
#include <m_json.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
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