Buy sell

if( _cursec != "" )
{
StaticVarSet( _cursec, 0 );
_cursec = "";
}
}
function TimeConsumingWork()
{
// WARNING: the Percentile is CPU hungry as it involves lots of sorting,
the loop below may take > 1 second to complete
for( i = 0; i< 10; i++ ) Percentile( C, 100, 10 );
}
//_TRACE("Without CS Begin " + GetChartID() );
//TimeConsumingWork(); // some time consuming calculation
//_TRACE("Without CS End" + GetChartID() );
// Example usage (critical section)
if( _TryEnterCS( "mysemaphore" ) )
{
// you are inside critical section now
_TRACE("Begin CS " + GetChartID() );
TimeConsumingWork(); // some time consuming calculation
_TRACE("End CS " + GetChartID() );
_LeaveCS();
}
else
{
_TRACE("Unable to enter CS");
// EXAMPLE 1 : Simple semaphore (no waiting)
if( StaticVarCompareExchange( "semaphore", 1, 0 ) == 0 ) // obtain
semaphore
{
// protected section here
// Here you have exclusive access (no other threads that check for
semaphore will enter simultaneously)
/////////////////////////
StaticVarSet("semaphore", 0 ); // reset semaphore
}
else
{
_TRACE("Can not obtain semaphore");
}
///////////////
// EXAMPLE 2 HOW TO IMPLEMENT CRITICAL SECTION IN AFL
///////////////
function _TryEnterCS( secname )
{
global _cursec;
_cursec= "";
// try obtaining semaphore for 1000 ms
for( i = 0; i < 1000; i++ )
if( StaticVarCompareExchange( secname, 1, 0 ) == 0 )
{
_cursec = secname;
break;
}
else ThreadSleep( 1 ); //sleep one millisecond
return _cursec != "";
}
// call it ONLY when _TryEnterCS returned TRUE !
function _LeaveCS()
{
global _cursec;

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