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/* Watchdog and associated classes' declaration and inline functions.
Copyright (C) 2001-2009 Roberto Bagnara <bagnara@cs.unipr.it>
This file is part of the Parma Watchdog Library (PWL).
The PWL 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 3 of the License, or (at your
option) any later version.
The PWL 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., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1307, USA.
For the most up-to-date information see the Parma Polyhedra Library
site: http://www.cs.unipr.it/ppl/ . */
#ifndef PWL_Watchdog_defs_hh
#define PWL_Watchdog_defs_hh 1
#include "Watchdog.types.hh"
#include "Time.defs.hh"
#include "Handler.types.hh"
#include "Pending_List.defs.hh"
#include <cassert>
#ifdef PWL_HAVE_SYS_TIME_H
# include <sys/time.h>
#endif
namespace Parma_Watchdog_Library {
// Set linkage now to declare it friend later.
extern "C" void PWL_handle_timeout(int signum);
//! A watchdog timer.
class Watchdog {
public:
template <typename Flag_Base, typename Flag>
Watchdog(int units, const Flag_Base* volatile& holder, Flag& flag);
Watchdog(int units, void (*function)());
~Watchdog();
#if PWL_HAVE_DECL_SETITIMER && PWL_HAVE_DECL_SIGACTION
private:
friend class Init;
static void initialize();
static void finalize();
bool expired;
const Handler& handler;
Pending_List::Iterator pending_position;
private:
// Just to prevent their use.
Watchdog(const Watchdog&);
Watchdog& operator=(const Watchdog&);
// Pass this to getitimer().
static itimerval current_timer_status;
// Get the timer value.
static void get_timer(Time& time);
// Pass this to setitimer().
static itimerval signal_once;
// Last time value we set the timer to.
static Time last_time_requested;
// Set the timer value.
static void set_timer(const Time& time);
// Stops the timer.
static void stop_timer();
// Quick reschedule to avoid race conditions.
static void reschedule();
// Used by the above.
static Time reschedule_time;
// Records the time elapsed since last fresh start.
static Time time_so_far;
//! The ordered queue of pending watchdog events.
static Pending_List pending;
//! The actual signal handler.
static void handle_timeout(int);
// Handle the addition of a new watchdog event.
static Pending_List::Iterator new_watchdog_event(int units,
const Handler& handler,
bool& expired_flag);
// Handle the removal of a watchdog event.
void remove_watchdog_event(Pending_List::Iterator position);
// Whether the alarm clock is running.
static volatile bool alarm_clock_running;
// Whether we are changing data that is also changed by the signal handler.
static volatile bool in_critical_section;
friend void PWL_handle_timeout(int signum);
#endif // PWL_HAVE_DECL_SETITIMER && PWL_HAVE_DECL_SIGACTION
};
#if PWL_HAVE_DECL_SETITIMER && PWL_HAVE_DECL_SIGACTION
class Init {
private:
//! Count the number of objects created.
static unsigned int count;
public:
//! Initializes the PWL.
Init();
//! Finalizes the PWL.
~Init();
};
#endif // PWL_HAVE_DECL_SETITIMER && PWL_HAVE_DECL_SIGACTION
} // namespace Parma_Watchdog_Library
#include "Watchdog.inlines.hh"
#if PWL_HAVE_DECL_SETITIMER && PWL_HAVE_DECL_SIGACTION
namespace {
Parma_Watchdog_Library::Init Parma_Watchdog_Library_initializer;
} // namespace
#endif // PWL_HAVE_DECL_SETITIMER && PWL_HAVE_DECL_SIGACTION
#endif // !defined(PWL_Watchdog_defs_hh)
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