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/*
Copyright (C) 2000 Paul Davis
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., 675 Mass Ave, Cambridge, MA 02139, USA.
$Id$
*/
#ifndef __pbd_lockmonitor_h__
#define __pbd_lockmonitor_h__
#include <pthread.h>
#include <pbd/pthread_spinlock.h>
#undef DEBUG_LOCK_MONITOR
#ifdef DEBUG_LOCK_MONITOR
#include <iostream>
#include <ardour/cycles.h>
#endif
namespace PBD
{
class Lock {
public:
Lock() { pthread_mutex_init (&_mutex, 0); }
virtual ~Lock() {}
virtual int lock () { return pthread_mutex_lock (&_mutex); }
virtual int unlock() { return pthread_mutex_unlock (&_mutex); }
pthread_mutex_t *mutex() { return &_mutex; }
protected:
pthread_mutex_t _mutex;
};
class NonBlockingLock : public Lock {
public:
NonBlockingLock() {}
~NonBlockingLock(){}
int lock () { return pthread_mutex_lock (&_mutex); }
int trylock () { return pthread_mutex_trylock (&_mutex); }
int unlock() { return pthread_mutex_unlock (&_mutex); }
};
class RWLock {
public:
RWLock() { pthread_rwlock_init (&_mutex, 0); }
virtual ~RWLock() { pthread_rwlock_destroy(&_mutex); }
virtual int write_lock () { return pthread_rwlock_wrlock (&_mutex); }
virtual int read_lock () { return pthread_rwlock_rdlock (&_mutex); }
virtual int unlock() { return pthread_rwlock_unlock (&_mutex); }
pthread_rwlock_t *mutex() { return &_mutex; }
protected:
pthread_rwlock_t _mutex;
};
class NonBlockingRWLock : public RWLock {
public:
NonBlockingRWLock() {}
~NonBlockingRWLock(){}
int write_trylock () { return pthread_rwlock_trywrlock (&_mutex); }
int read_trylock () { return pthread_rwlock_tryrdlock (&_mutex); }
};
class LockMonitor
{
public:
LockMonitor (Lock& lck, unsigned long l, const char *f)
: lock (lck)
#ifdef DEBUG_LOCK_MONITOR
, line (l), file (f)
#endif
{
#ifdef DEBUG_LOCK_MONITOR
unsigned long long when;
when = get_cycles();
cerr << when << " lock " << &lock << " at " << line << " in " << file << endl;
#endif
lock.lock ();
#ifdef DEBUG_LOCK_MONITOR
when = get_cycles();
cerr << '\t' << when
<< " locked: "
<< &lock << " at "
<< line << " in " << file << endl;
#endif
}
~LockMonitor () {
lock.unlock ();
#ifdef DEBUG_LOCK_MONITOR
unsigned long long when;
when = get_cycles();
cerr << '\t' << when << ' '
<< " UNLOCKED "
<< &lock << " at "
<< line << " in " << file << endl;
#endif
}
private:
Lock& lock;
#ifdef DEBUG_LOCK_MONITOR
unsigned long line;
const char * file;
#endif
};
class TentativeLockMonitor
{
public:
TentativeLockMonitor (NonBlockingLock& lck, unsigned long l, const char *f)
: lock (lck)
#ifdef DEBUG_LOCK_MONITOR
, line (l), file (f)
#endif
{
#ifdef DEBUG_LOCK_MONITOR
unsigned long long when;
when = get_cycles();
cerr << when << " tentative lock " << &lock << " at " << line << " in " << file << endl;
#endif
_locked = (lock.trylock() == 0);
#ifdef DEBUG_LOCK_MONITOR
when = get_cycles();
cerr << '\t' << when << ' '
<< _locked
<< " lock: "
<< &lock << " at "
<< line << " in " << file << endl;
#endif
}
~TentativeLockMonitor () {
if (_locked) {
lock.unlock ();
#ifdef DEBUG_LOCK_MONITOR
unsigned long long when;
when = get_cycles();
cerr << '\t' << when << ' '
<< " UNLOCKED "
<< &lock << " at "
<< line << " in " << file << endl;
#endif
}
}
bool locked() { return _locked; }
private:
NonBlockingLock& lock;
bool _locked;
#ifdef DEBUG_LOCK_MONITOR
unsigned long line;
const char * file;
#endif
};
class SpinLockMonitor
{
public:
SpinLockMonitor (pthread_mutex_t *lck, unsigned long l, const char *f)
: lock (lck)
#ifdef DEBUG_LOCK_MONITOR
, line (l), file (f)
#endif
{
#ifdef DEBUG_LOCK_MONITOR
unsigned long long when;
when = get_cycles();
cerr << when << " spinlock " << lck << " at " << line << " in " << file << endl;
#endif
pthread_mutex_spinlock (lck);
#ifdef DEBUG_LOCK_MONITOR
when = get_cycles();
cerr << '\t' << when
<< " locked at "
<< &lock << " at "
<< line << " in " << file << endl;
#endif
}
~SpinLockMonitor () {
pthread_mutex_unlock (lock);
}
private:
pthread_mutex_t *lock;
#ifdef DEBUG_LOCK_MONITOR
unsigned long line;
const char * file;
#endif
};
class RWLockMonitor
{
public:
RWLockMonitor (RWLock& lck, bool write, unsigned long l, const char *f)
: lock (lck)
#ifdef DEBUG_LOCK_MONITOR
, line (l), file (f)
#endif
{
#ifdef DEBUG_LOCK_MONITOR
unsigned long long when;
when = get_cycles();
cerr << when << " lock " << &lock << " at " << line << " in " << file << endl;
#endif
if (write) {
lock.write_lock ();
} else {
lock.read_lock ();
}
#ifdef DEBUG_LOCK_MONITOR
when = get_cycles();
cerr << '\t' << when
<< " locked: "
<< &lock << " at "
<< line << " in " << file << endl;
#endif
}
~RWLockMonitor () {
lock.unlock ();
#ifdef DEBUG_LOCK_MONITOR
unsigned long long when;
when = get_cycles();
cerr << '\t' << when << ' '
<< " UNLOCKED "
<< &lock << " at "
<< line << " in " << file << endl;
#endif
}
private:
RWLock& lock;
#ifdef DEBUG_LOCK_MONITOR
unsigned long line;
const char * file;
#endif
};
class TentativeRWLockMonitor
{
public:
TentativeRWLockMonitor (NonBlockingRWLock& lck, bool write, unsigned long l, const char *f)
: lock (lck)
#ifdef DEBUG_LOCK_MONITOR
, line (l), file (f)
#endif
{
#ifdef DEBUG_LOCK_MONITOR
unsigned long long when;
when = get_cycles();
cerr << when << " tentative lock " << &lock << " at " << line << " in " << file << endl;
#endif
if (write) {
_locked = (lock.write_trylock() == 0);
} else {
_locked = (lock.read_trylock() == 0);
}
#ifdef DEBUG_LOCK_MONITOR
when = get_cycles();
cerr << '\t' << when << ' '
<< _locked
<< " lock: "
<< &lock << " at "
<< line << " in " << file << endl;
#endif
}
~TentativeRWLockMonitor () {
if (_locked) {
lock.unlock ();
#ifdef DEBUG_LOCK_MONITOR
unsigned long long when;
when = get_cycles();
cerr << '\t' << when << ' '
<< " UNLOCKED "
<< &lock << " at "
<< line << " in " << file << endl;
#endif
}
}
bool locked() { return _locked; }
private:
NonBlockingRWLock& lock;
bool _locked;
#ifdef DEBUG_LOCK_MONITOR
unsigned long line;
const char * file;
#endif
};
} /* namespace */
#endif /* __pbd_lockmonitor_h__*/
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