/usr/include/tango/tango_monitor.h is in libtango8-dev 8.1.2c+dfsg-7ubuntu3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// file : tango_monitor.h
//
// description : Include file for the Tango_monitor class
//
// project : TANGO
//
// author(s) : E.Taurel
//
// Copyright (C) : 2004,2005,2006,2007,2008,2009,2010,2011,2012,2013
// European Synchrotron Radiation Facility
// BP 220, Grenoble 38043
// FRANCE
//
// This file is part of Tango.
//
// Tango is free software: you can redistribute it and/or modify it under the terms of the GNU
// Lesser General Public License as published by the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Tango 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 Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License along with Tango.
// If not, see <http://www.gnu.org/licenses/>.
//
// $Revision: 22213 $
//
//===================================================================================================================
#ifndef _TANGO_MONITOR_H
#define _TANGO_MONITOR_H
namespace Tango
{
//--------------------------------------------------------------------------------------------------------------------
//
// class :
// TangoMonitor
//
// description :
// This class is used to synchronise device access between polling thread and CORBA request. It is used only for
// the command_inout and read_attribute calls
//
//--------------------------------------------------------------------------------------------------------------------
class TangoMonitor: public omni_mutex
{
public :
TangoMonitor(const char *na):_timeout(DEFAULT_TIMEOUT),cond(this),
locking_thread(NULL),locked_ctr(0),name(na) {};
TangoMonitor():_timeout(DEFAULT_TIMEOUT),cond(this),locking_thread(NULL),
locked_ctr(0),name("unknown") {};
~TangoMonitor() {};
void get_monitor();
void rel_monitor();
void timeout(long new_to) {_timeout = new_to;}
long timeout() {return _timeout;}
void wait() {cond.wait();}
int wait(long);
void signal() {cond.signal();}
int get_locking_thread_id();
long get_locking_ctr();
string &get_name() {return name;}
private :
long _timeout;
omni_condition cond;
omni_thread *locking_thread;
long locked_ctr;
string name;
};
//--------------------------------------------------------------------------------------------------------------------
//
// methods :
// TangoMonitor::get_locking_thread_id
// TangoMonitor::get_locking_ctr
//
//-------------------------------------------------------------------------------------------------------------------
inline int TangoMonitor::get_locking_thread_id()
{
if (locking_thread != NULL)
return locking_thread->id();
else
return 0;
}
inline long TangoMonitor::get_locking_ctr()
{
omni_mutex_lock guard(*this);
return locked_ctr;
}
//--------------------------------------------------------------------------------------------------------------------
//
// method :
// TangoMonitor::get_monitor
//
// description :
// Get a monitor. The thread will wait (with timeout) if the monitor is already locked. If the thread is already
// the monitor owner thread, simply increment the locking counter
//
//--------------------------------------------------------------------------------------------------------------------
inline void TangoMonitor::get_monitor()
{
omni_thread *th = omni_thread::self();
omni_mutex_lock synchronized(*this);
#if !defined(_TG_WINDOWS_) || (defined(_MSC_VER) && _MSC_VER >= 1300)
cout4 << "In get_monitor() " << name << ", thread = " << th->id() << ", ctr = " << locked_ctr << endl;
#endif
if (locked_ctr == 0)
{
locking_thread = th;
}
else if (th != locking_thread)
{
while(locked_ctr > 0)
{
#if !defined(_TG_WINDOWS_) || (defined(_MSC_VER) && _MSC_VER >= 1300)
cout4 << "Thread " << th->id() << ": waiting !!" << endl;
#endif
int interupted;
interupted = wait(_timeout);
if (interupted == false)
{
#if !defined(_TG_WINDOWS_) || (defined(_MSC_VER) && _MSC_VER >= 1300)
cout4 << "TIME OUT for thread " << th->id() << endl;
#endif
Except::throw_exception((const char *)API_CommandTimedOut,
(const char *)"Not able to acquire serialization (dev, class or process) monitor",
(const char *)"TangoMonitor::get_monitor");
}
}
locking_thread = th;
}
else
{
#if !defined(_TG_WINDOWS_) || (defined(_MSC_VER) && _MSC_VER >= 1300)
cout4 << "owner_thread !!" << endl;
#endif
}
locked_ctr++;
}
//--------------------------------------------------------------------------------------------------------------------
//
// method :
// TangoMonitor::rel_monitor
//
// description :
// Release a monitor if the caller thread is the locking thread. Signal other threads if the locking counter
// goes down to zero
//
//--------------------------------------------------------------------------------------------------------------------
inline void TangoMonitor::rel_monitor()
{
omni_thread *th = omni_thread::self();
omni_mutex_lock synchronized(*this);
#if !defined(_TG_WINDOWS_) || (defined(_MSC_VER) && _MSC_VER >= 1300)
cout4 << "In rel_monitor() " << name << ", ctr = " << locked_ctr << ", thread = " << th->id() << endl;
#endif
if ((locked_ctr == 0) || (th != locking_thread))
return;
locked_ctr--;
if (locked_ctr == 0)
{
#if !defined(_TG_WINDOWS_) || (defined(_MSC_VER) && _MSC_VER >= 1300)
cout4 << "Signalling !" << endl;
#endif
locking_thread = NULL;
cond.signal();
}
}
} // End of Tango namespace
#endif /* TANGO_MONITOR */
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