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/*
Copyright (C) 2008-2015 Michael Goffioul
This file is part of Octave.
Octave 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.
Octave 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 Octave; see the file COPYING. If not, see
<http://www.gnu.org/licenses/>.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include "oct-mutex.h"
#include "lo-error.h"
#if defined (__WIN32__) && ! defined (__CYGWIN__)
#include <windows.h>
#elif defined (HAVE_PTHREAD_H)
#include <pthread.h>
#endif
void
octave_base_mutex::lock (void)
{
(*current_liboctave_error_handler) ("mutex not supported on this platform");
}
void
octave_base_mutex::unlock (void)
{
(*current_liboctave_error_handler) ("mutex not supported on this platform");
}
bool
octave_base_mutex::try_lock (void)
{
(*current_liboctave_error_handler) ("mutex not supported on this platform");
return false;
}
#if defined (__WIN32__) && ! defined (__CYGWIN__)
class
octave_w32_mutex : public octave_base_mutex
{
public:
octave_w32_mutex (void)
: octave_base_mutex ()
{
InitializeCriticalSection (&cs);
}
~octave_w32_mutex (void)
{
DeleteCriticalSection (&cs);
}
void lock (void)
{
EnterCriticalSection (&cs);
}
void unlock (void)
{
LeaveCriticalSection (&cs);
}
bool try_lock (void)
{
return (TryEnterCriticalSection (&cs) != 0);
}
private:
CRITICAL_SECTION cs;
};
static DWORD octave_thread_id = 0;
void
octave_thread::init (void)
{
octave_thread_id = GetCurrentThreadId ();
}
bool
octave_thread::is_octave_thread (void)
{
return (GetCurrentThreadId () == octave_thread_id);
}
#elif defined (HAVE_PTHREAD_H)
class
octave_pthread_mutex : public octave_base_mutex
{
public:
octave_pthread_mutex (void)
: octave_base_mutex (), pm ()
{
pthread_mutexattr_t attr;
pthread_mutexattr_init (&attr);
pthread_mutexattr_settype (&attr, PTHREAD_MUTEX_RECURSIVE);
pthread_mutex_init (&pm, &attr);
pthread_mutexattr_destroy (&attr);
}
~octave_pthread_mutex (void)
{
pthread_mutex_destroy (&pm);
}
void lock (void)
{
pthread_mutex_lock (&pm);
}
void unlock (void)
{
pthread_mutex_unlock (&pm);
}
bool try_lock (void)
{
return (pthread_mutex_trylock (&pm) == 0);
}
private:
pthread_mutex_t pm;
};
static pthread_t octave_thread_id = 0;
void
octave_thread::init (void)
{
octave_thread_id = pthread_self ();
}
bool
octave_thread::is_octave_thread (void)
{
return (pthread_equal (octave_thread_id, pthread_self ()) != 0);
}
#endif
static octave_base_mutex *
init_rep (void)
{
#if defined (__WIN32__) && ! defined (__CYGWIN__)
return new octave_w32_mutex ();
#elif defined (HAVE_PTHREAD_H)
return new octave_pthread_mutex ();
#else
return new octave_base_mutex ();
#endif
}
octave_mutex::octave_mutex (void) : rep (init_rep ()) { }
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