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/*
FALCON - The Falcon Programming Language.
FILE: baton_posix.cpp
Baton synchronization structure.
-------------------------------------------------------------------
Author: Giancarlo Niccolai
Begin: Sat, 14 Mar 2009 00:03:28 +0100
-------------------------------------------------------------------
(C) Copyright 2004: the FALCON developers (see list in AUTHORS file)
See LICENSE file for licensing details.
*/
#include <falcon/memory.h>
#include <falcon/baton.h>
#include <falcon/fassert.h>
#include <falcon/mt_posix.h>
namespace Falcon {
typedef struct tag_POSIX_BATON_DATA
{
bool m_bBusy;
bool m_bBlocked;
pthread_t m_thBlocker;
pthread_mutex_t m_mtx;
pthread_cond_t m_cv;
} POSIX_BATON_DATA;
Baton::Baton( bool bBusy )
{
m_data = (POSIX_BATON_DATA *) memAlloc( sizeof( POSIX_BATON_DATA ) );
POSIX_BATON_DATA &p = *(POSIX_BATON_DATA *)m_data;
p.m_bBusy = bBusy;
p.m_bBlocked = false;
#ifdef NDEBUG
pthread_mutex_init( &p.m_mtx, 0 );
pthread_cond_init( &p.m_cv, 0 );
#else
int res = pthread_mutex_init( &p.m_mtx, 0 );
fassert( res == 0 );
res = pthread_cond_init( &p.m_cv, 0 );
fassert( res == 0 );
#endif
}
Baton::~Baton()
{
POSIX_BATON_DATA &p = *(POSIX_BATON_DATA *)m_data;
#ifdef NDEBUG
pthread_mutex_destroy( &p.m_mtx );
pthread_cond_destroy( &p.m_cv );
#else
int res = pthread_mutex_destroy( &p.m_mtx );
fassert( res == 0 );
res = pthread_cond_destroy( &p.m_cv );
fassert( res == 0 );
#endif
memFree( m_data );
}
void Baton::acquire()
{
POSIX_BATON_DATA &p = *(POSIX_BATON_DATA *)m_data;
mutex_lock( p.m_mtx );
if( p.m_bBlocked && ! pthread_equal( pthread_self(), p.m_thBlocker ) )
{
mutex_unlock( p.m_mtx );
// no problem if we release the mutex here: it's ok, as the semantic is just that of firing this
// notify if we're blocked.
onBlockedAcquire();
mutex_lock( p.m_mtx );
}
while( p.m_bBusy || (p.m_bBlocked && ! pthread_equal( pthread_self(), p.m_thBlocker ) ) )
{
cv_wait( p.m_cv, p.m_mtx );
}
p.m_bBusy = true;
p.m_bBlocked = false;
mutex_unlock( p.m_mtx );
}
bool Baton::busy()
{
POSIX_BATON_DATA &p = *(POSIX_BATON_DATA *)m_data;
mutex_lock( p.m_mtx );
bool bbret = p.m_bBusy;
mutex_unlock( p.m_mtx );
return bbret;
}
bool Baton::tryAcquire()
{
POSIX_BATON_DATA &p = *(POSIX_BATON_DATA *)m_data;
mutex_lock( p.m_mtx );
if( p.m_bBusy || (p.m_bBlocked && ! pthread_equal( pthread_self(), p.m_thBlocker ) ) )
{
mutex_unlock( p.m_mtx );
return false;
}
p.m_bBusy = true;
p.m_bBlocked = false;
mutex_unlock( p.m_mtx );
return true;
}
void Baton::release()
{
POSIX_BATON_DATA &p = *(POSIX_BATON_DATA *)m_data;
mutex_lock( p.m_mtx );
p.m_bBusy = false;
cv_broadcast( p.m_cv );
mutex_unlock( p.m_mtx );
}
void Baton::checkBlock()
{
POSIX_BATON_DATA &p = *(POSIX_BATON_DATA *)m_data;
mutex_lock( p.m_mtx );
p.m_bBusy = false;
cv_broadcast( p.m_cv );
bool bb = (p.m_bBlocked && ! pthread_equal( pthread_self(), p.m_thBlocker ) );
if ( bb )
{
mutex_unlock( p.m_mtx );
onBlockedAcquire();
mutex_lock( p.m_mtx );
}
while( p.m_bBusy || (p.m_bBlocked && ! pthread_equal( pthread_self(), p.m_thBlocker ) ) )
{
cv_wait( p.m_cv, p.m_mtx );
}
p.m_bBusy = true;
p.m_bBlocked = false;
mutex_unlock( p.m_mtx );
}
bool Baton::block()
{
POSIX_BATON_DATA &p = *(POSIX_BATON_DATA *)m_data;
mutex_lock( p.m_mtx );
if ( (!p.m_bBusy) || (p.m_bBlocked && ! pthread_equal( pthread_self(), p.m_thBlocker )) )
{
mutex_unlock( p.m_mtx );
return false;
}
if ( ! p.m_bBlocked )
{
p.m_bBlocked = true;
p.m_thBlocker = pthread_self();
}
mutex_unlock( p.m_mtx );
return true;
}
bool Baton::unblock()
{
POSIX_BATON_DATA &p = *(POSIX_BATON_DATA *)m_data;
mutex_lock( p.m_mtx );
if ( p.m_bBlocked && pthread_equal( pthread_self(), p.m_thBlocker ) )
{
p.m_bBlocked = false;
cv_broadcast( p.m_cv );
mutex_unlock( p.m_mtx );
return true;
}
mutex_unlock( p.m_mtx );
return false;
}
void Baton::onBlockedAcquire()
{
}
}
/* end of baton_posix.cpp */
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