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/* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTUTILSLITY or FITNESS FOR A PARTICULAR PURPOSE. This
* file and program are licensed under a BSD style license. See
* the Copying file included with the OpenHPI distribution for
* full licensing terms.
*
* Author(s):
* Anton Pak <anton.pak@pigeonpoint.com>
*/
#include <algorithm>
#include "timers.h"
namespace TA {
/**************************************************************
* Helper functions
*************************************************************/
struct CallbackPred
{
bool operator ()( const Timer& item ) const
{
return item.callback == callback;
}
const cTimerCallback * callback;
};
/**********************************************************
* NB: comparison relies on the fact
* that x1.tv_usec and x2.tv_usec both < 1000000.
* I.e. GTimeVal data is valid.
*********************************************************/
bool operator <( const GTimeVal& x1, const GTimeVal& x2 )
{
if ( x1.tv_sec != x2.tv_sec ) {
return x1.tv_sec < x2.tv_sec;
} else {
return x1.tv_usec < x2.tv_usec;
}
}
/**************************************************************
* class cTimers
*************************************************************/
cTimers::cTimers()
: m_thread( 0 ),
m_cond( g_cond_new() ),
m_mutex( g_mutex_new() ),
m_stop( false )
{
}
cTimers::~cTimers()
{
if ( m_thread ) {
m_stop = true;
g_mutex_lock( m_mutex );
g_cond_signal( m_cond );
g_mutex_unlock( m_mutex );
g_thread_join( m_thread );
}
g_mutex_free( m_mutex );
g_cond_free( m_cond );
}
bool cTimers::Start()
{
m_thread = g_thread_create( ThreadFuncAdapter, this, TRUE, 0 );
//g_usleep( 1000 );
return ( m_thread != 0 );
}
void cTimers::SetTimer( cTimerCallback * callback, SaHpiTimeoutT timeout )
{
if ( timeout == SAHPI_TIMEOUT_IMMEDIATE ) {
callback->TimerEvent();
return;
} else if ( timeout == SAHPI_TIMEOUT_BLOCK ) {
return;
}
glong sec = timeout / 1000000000LL; // TODO possible overflow
glong usec = ( timeout % 1000000000LL ) / 1000LL;
Timer timer;
timer.callback = callback;
g_get_current_time( &timer.expire );
timer.expire.tv_sec += sec;
timer.expire.tv_usec += usec;
if ( timer.expire.tv_usec > 1000000L ) {
++timer.expire.tv_sec;
timer.expire.tv_usec -= 1000000L;
}
g_mutex_lock( m_mutex );
m_timers.push_back( timer );
g_cond_signal( m_cond );
g_mutex_unlock( m_mutex );
}
void cTimers::CancelTimer( const cTimerCallback * callback )
{
g_mutex_lock( m_mutex );
CallbackPred pred;
pred.callback = callback;
m_timers.remove_if( pred );
g_cond_signal( m_cond );
g_mutex_unlock( m_mutex );
}
bool cTimers::HasTimerSet( const cTimerCallback * callback )
{
g_mutex_lock( m_mutex );
CallbackPred pred;
pred.callback = callback;
Timers::const_iterator iter = std::find_if( m_timers.begin(), m_timers.end(), pred );
bool has = iter != m_timers.end();
g_mutex_unlock( m_mutex );
return has;
}
gpointer cTimers::ThreadFuncAdapter( gpointer data )
{
cTimers * me = reinterpret_cast<cTimers *>(data);
me->ThreadFunc();
return 0;
}
void cTimers::ThreadFunc()
{
if ( m_stop ) {
return;
}
g_mutex_lock( m_mutex );
GTimeVal now, next;
while ( !m_stop ) {
g_get_current_time( &next );
g_time_val_add( &next, 1800000000L /* + 30 min from now */ );
Timers rest;
while ( ( !m_stop ) && ( !m_timers.empty() ) ) {
Timer t = m_timers.front();
m_timers.pop_front();
g_get_current_time( &now );
if ( now < t.expire ) {
rest.push_back( t );
if ( t.expire < next ) {
next = t.expire;
}
} else {
g_mutex_unlock( m_mutex );
// TODO Callback can be deleted there
t.callback->TimerEvent();
g_mutex_lock( m_mutex );
}
}
if ( m_stop ) {
break;
}
m_timers.swap( rest );
g_cond_timed_wait( m_cond, m_mutex, &next );
}
g_mutex_unlock( m_mutex );
}
}; // namespace TA
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