326 lines
7.0 KiB
C++
326 lines
7.0 KiB
C++
/*
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Copyright (C) 2000 Paul Davis
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id$
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*/
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#ifndef __pbd_lockmonitor_h__
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#define __pbd_lockmonitor_h__
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#include <pthread.h>
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#include <pbd/pthread_spinlock.h>
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#undef DEBUG_LOCK_MONITOR
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#ifdef DEBUG_LOCK_MONITOR
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#include <iostream>
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#include <ardour/cycles.h>
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#endif
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namespace PBD
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{
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class Lock {
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public:
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Lock() { pthread_mutex_init (&_mutex, 0); }
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virtual ~Lock() {}
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virtual int lock () { return pthread_mutex_lock (&_mutex); }
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virtual int unlock() { return pthread_mutex_unlock (&_mutex); }
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pthread_mutex_t *mutex() { return &_mutex; }
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protected:
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pthread_mutex_t _mutex;
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};
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class NonBlockingLock : public Lock {
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public:
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NonBlockingLock() {}
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~NonBlockingLock(){}
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int lock () { return pthread_mutex_lock (&_mutex); }
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int trylock () { return pthread_mutex_trylock (&_mutex); }
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int unlock() { return pthread_mutex_unlock (&_mutex); }
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};
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class RWLock {
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public:
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RWLock() { pthread_rwlock_init (&_mutex, 0); }
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virtual ~RWLock() { pthread_rwlock_destroy(&_mutex); }
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virtual int write_lock () { return pthread_rwlock_wrlock (&_mutex); }
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virtual int read_lock () { return pthread_rwlock_rdlock (&_mutex); }
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virtual int unlock() { return pthread_rwlock_unlock (&_mutex); }
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pthread_rwlock_t *mutex() { return &_mutex; }
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protected:
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pthread_rwlock_t _mutex;
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};
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class NonBlockingRWLock : public RWLock {
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public:
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NonBlockingRWLock() {}
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~NonBlockingRWLock(){}
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int write_trylock () { return pthread_rwlock_trywrlock (&_mutex); }
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int read_trylock () { return pthread_rwlock_tryrdlock (&_mutex); }
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};
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class LockMonitor
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{
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public:
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LockMonitor (Lock& lck, unsigned long l, const char *f)
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: lock (lck)
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#ifdef DEBUG_LOCK_MONITOR
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, line (l), file (f)
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#endif
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{
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long long when;
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when = get_cycles();
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cerr << when << " lock " << &lock << " at " << line << " in " << file << endl;
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#endif
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lock.lock ();
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#ifdef DEBUG_LOCK_MONITOR
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when = get_cycles();
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cerr << '\t' << when
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<< " locked: "
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<< &lock << " at "
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<< line << " in " << file << endl;
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#endif
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}
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~LockMonitor () {
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lock.unlock ();
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long long when;
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when = get_cycles();
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cerr << '\t' << when << ' '
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<< " UNLOCKED "
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<< &lock << " at "
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<< line << " in " << file << endl;
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#endif
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}
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private:
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Lock& lock;
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long line;
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const char * file;
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#endif
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};
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class TentativeLockMonitor
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{
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public:
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TentativeLockMonitor (NonBlockingLock& lck, unsigned long l, const char *f)
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: lock (lck)
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#ifdef DEBUG_LOCK_MONITOR
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, line (l), file (f)
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#endif
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{
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long long when;
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when = get_cycles();
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cerr << when << " tentative lock " << &lock << " at " << line << " in " << file << endl;
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#endif
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_locked = (lock.trylock() == 0);
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#ifdef DEBUG_LOCK_MONITOR
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when = get_cycles();
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cerr << '\t' << when << ' '
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<< _locked
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<< " lock: "
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<< &lock << " at "
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<< line << " in " << file << endl;
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#endif
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}
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~TentativeLockMonitor () {
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if (_locked) {
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lock.unlock ();
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long long when;
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when = get_cycles();
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cerr << '\t' << when << ' '
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<< " UNLOCKED "
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<< &lock << " at "
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<< line << " in " << file << endl;
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#endif
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}
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}
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bool locked() { return _locked; }
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private:
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NonBlockingLock& lock;
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bool _locked;
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long line;
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const char * file;
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#endif
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};
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class SpinLockMonitor
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{
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public:
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SpinLockMonitor (pthread_mutex_t *lck, unsigned long l, const char *f)
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: lock (lck)
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#ifdef DEBUG_LOCK_MONITOR
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, line (l), file (f)
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#endif
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{
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long long when;
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when = get_cycles();
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cerr << when << " spinlock " << lck << " at " << line << " in " << file << endl;
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#endif
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pthread_mutex_spinlock (lck);
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#ifdef DEBUG_LOCK_MONITOR
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when = get_cycles();
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cerr << '\t' << when
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<< " locked at "
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<< &lock << " at "
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<< line << " in " << file << endl;
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#endif
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}
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~SpinLockMonitor () {
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pthread_mutex_unlock (lock);
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}
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private:
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pthread_mutex_t *lock;
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long line;
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const char * file;
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#endif
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};
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class RWLockMonitor
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{
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public:
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RWLockMonitor (RWLock& lck, bool write, unsigned long l, const char *f)
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: lock (lck)
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#ifdef DEBUG_LOCK_MONITOR
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, line (l), file (f)
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#endif
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{
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long long when;
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when = get_cycles();
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cerr << when << " lock " << &lock << " at " << line << " in " << file << endl;
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#endif
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if (write) {
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lock.write_lock ();
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} else {
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lock.read_lock ();
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}
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#ifdef DEBUG_LOCK_MONITOR
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when = get_cycles();
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cerr << '\t' << when
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<< " locked: "
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<< &lock << " at "
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<< line << " in " << file << endl;
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#endif
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}
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~RWLockMonitor () {
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lock.unlock ();
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long long when;
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when = get_cycles();
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cerr << '\t' << when << ' '
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<< " UNLOCKED "
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<< &lock << " at "
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<< line << " in " << file << endl;
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#endif
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}
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private:
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RWLock& lock;
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long line;
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const char * file;
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#endif
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};
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class TentativeRWLockMonitor
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{
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public:
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TentativeRWLockMonitor (NonBlockingRWLock& lck, bool write, unsigned long l, const char *f)
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: lock (lck)
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#ifdef DEBUG_LOCK_MONITOR
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, line (l), file (f)
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#endif
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{
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long long when;
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when = get_cycles();
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cerr << when << " tentative lock " << &lock << " at " << line << " in " << file << endl;
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#endif
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if (write) {
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_locked = (lock.write_trylock() == 0);
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} else {
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_locked = (lock.read_trylock() == 0);
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}
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#ifdef DEBUG_LOCK_MONITOR
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when = get_cycles();
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cerr << '\t' << when << ' '
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<< _locked
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<< " lock: "
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<< &lock << " at "
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<< line << " in " << file << endl;
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#endif
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}
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~TentativeRWLockMonitor () {
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if (_locked) {
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lock.unlock ();
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long long when;
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when = get_cycles();
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cerr << '\t' << when << ' '
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<< " UNLOCKED "
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<< &lock << " at "
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<< line << " in " << file << endl;
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#endif
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}
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}
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bool locked() { return _locked; }
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private:
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NonBlockingRWLock& lock;
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bool _locked;
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#ifdef DEBUG_LOCK_MONITOR
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unsigned long line;
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const char * file;
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#endif
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};
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} /* namespace */
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#endif /* __pbd_lockmonitor_h__*/
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