195 lines
4.2 KiB
C++
195 lines
4.2 KiB
C++
/*
|
|
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 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
|
|
};
|
|
|
|
} /* namespace */
|
|
|
|
#endif /* __pbd_lockmonitor_h__*/
|