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/* concurrency.h
mongod concurrency rules & notes will be placed here.
Mutex heirarchy (1 = "leaf")
name level
Logstream::mutex 1
ClientCursor::ccmutex 2
dblock 3
End func name with _inlock to indicate "caller must lock before calling".
*/
#pragma once
#if BOOST_VERSION >= 103500
#include <boost/thread/shared_mutex.hpp>
#undef assert
#define assert xassert
#endif
namespace mongo {
#if 0
//#if BOOST_VERSION >= 103500
//typedef boost::shared_mutex MongoMutex;
class MongoMutex {
boost::shared_mutex m;
public:
void lock() {
m.lock();
}
void unlock() { m.unlock(); }
void lock_shared() { m.lock_shared(); }
void unlock_shared() { m.unlock_shared(); }
};
#else
/* this will be for old versions of boost */
class MongoMutex {
boost::recursive_mutex m;
int x;
public:
MongoMutex() { x=0; }
void lock() {
#if BOOST_VERSION >= 103500
m.lock();
#else
boost::detail::thread::lock_ops<boost::recursive_mutex>::lock(m);
#endif
}
void unlock() {
#if BOOST_VERSION >= 103500
m.unlock();
#else
boost::detail::thread::lock_ops<boost::recursive_mutex>::unlock(m);
#endif
}
void lock_shared() { lock(); }
void unlock_shared() { unlock(); }
};
#endif
/* mutex time stats */
class MutexInfo {
unsigned long long start, enter, timeLocked; // all in microseconds
int locked;
public:
MutexInfo() : locked(0) {
start = curTimeMicros64();
}
void entered() {
if ( locked == 0 )
enter = curTimeMicros64();
locked++;
assert( locked >= 1 );
}
void leaving() {
locked--;
assert( locked >= 0 );
if ( locked == 0 )
timeLocked += curTimeMicros64() - enter;
}
int isLocked() const {
return locked;
}
void timingInfo(unsigned long long &s, unsigned long long &tl) {
s = start;
tl = timeLocked;
}
};
extern MongoMutex &dbMutex;
extern MutexInfo dbMutexInfo;
/*
struct lock {
recursive_boostlock bl_;
MutexInfo& info_;
lock( boost::recursive_mutex &mutex, MutexInfo &info ) :
bl_( mutex ),
info_( info ) {
info_.entered();
}
~lock() {
info_.leaving();
}
};
*/
void dbunlocking_write();
void dbunlocking_read();
struct writelock {
writelock(const string& ns) {
dbMutex.lock();
dbMutexInfo.entered();
}
~writelock() {
dbunlocking_write();
dbMutexInfo.leaving();
dbMutex.unlock();
}
};
struct readlock {
readlock(const string& ns) {
dbMutex.lock_shared();
}
~readlock() {
dbunlocking_read();
dbMutex.unlock_shared();
}
};
class mongolock {
bool _writelock;
public:
mongolock(bool write) : _writelock(write) {
if( _writelock ) {
dbMutex.lock();
dbMutexInfo.entered();
}
else
dbMutex.lock_shared();
}
~mongolock() {
if( _writelock ) {
dbunlocking_write();
dbMutexInfo.leaving();
dbMutex.unlock();
}
else {
dbunlocking_read();
dbMutex.unlock_shared();
}
}
/* this unlocks, does NOT upgrade. that works for our current usage */
void releaseAndWriteLock() {
if( !_writelock ) {
_writelock = true;
dbMutex.unlock_shared();
dbMutex.lock();
dbMutexInfo.entered();
}
}
};
/* use writelock and readlock instead */
struct dblock : public writelock {
dblock() : writelock("") { }
~dblock() {
}
};
/* a scoped release of a mutex temporarily -- like a scopedlock but reversed.
*/
/*
struct temprelease {
boost::mutex& m;
temprelease(boost::mutex& _m) : m(_m) {
#if BOOST_VERSION >= 103500
m.unlock();
#else
boost::detail::thread::lock_ops<boost::mutex>::unlock(m);
#endif
}
~temprelease() {
#if BOOST_VERSION >= 103500
m.lock();
#else
boost::detail::thread::lock_ops<boost::mutex>::lock(m);
#endif
}
};
*/
inline void assertInWriteLock() {
/* TEMP assert( dbMutexInfo.isLocked() );
*/
}
}
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