/*
    Copyright 2005-2010 Intel Corporation.  All Rights Reserved.

    This file is part of Threading Building Blocks.

    Threading Building Blocks is free software; you can redistribute it
    and/or modify it under the terms of the GNU General Public License
    version 2 as published by the Free Software Foundation.

    Threading Building Blocks 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 Threading Building Blocks; if not, write to the Free Software
    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    As a special exception, you may use this file as part of a free software
    library without restriction.  Specifically, if other files instantiate
    templates or use macros or inline functions from this file, or you compile
    this file and link it with other files to produce an executable, this
    file does not by itself cause the resulting executable to be covered by
    the GNU General Public License.  This exception does not however
    invalidate any other reasons why the executable file might be covered by
    the GNU General Public License.
*/

#include <cstdio>
#include <cstdlib>
#include <cassert>
#include <utility>
#include "tbb/task.h"
#include "tbb/task_scheduler_init.h"
#include "tbb/tick_count.h"
#include "tbb/parallel_for.h"
#include "tbb/blocked_range.h"
#include "tbb/mutex.h"
#include "tbb/spin_mutex.h"
#include "tbb/queuing_mutex.h"
#include "harness.h"

using namespace std;
using namespace tbb;

///////////////////// Parallel methods ////////////////////////

// *** Serial shared by mutexes *** //
int SharedI = 1, SharedN;
template<typename M>
class SharedSerialFibBody: NoAssign {
    M &mutex;
public:
    SharedSerialFibBody( M &m ) : mutex( m ) {}
    //! main loop
    void operator()( const blocked_range<int>& /*range*/ ) const {
        for(;;) {
            typename M::scoped_lock lock( mutex );
            if(SharedI >= SharedN) break;
            volatile double sum = 7.3; 
            sum *= 11.17;
            ++SharedI;
        }
    }
};

//! Root function
template<class M>
void SharedSerialFib(int n)
{
    SharedI = 1; 
    SharedN = n; 
    M mutex;
    parallel_for( blocked_range<int>(0,4,1), SharedSerialFibBody<M>( mutex ) );
}

/////////////////////////// Main ////////////////////////////////////////////////////

double Tsum = 0; int Tnum = 0;

typedef void (*MeasureFunc)(int);
//! Measure ticks count in loop [2..n]
void Measure(const char *name, MeasureFunc func, int n)
{
    tick_count t0;
    tick_count::interval_t T;
    REMARK("%s",name);
    t0 = tick_count::now();
    for(int number = 2; number <= n; number++)
        func(number);
    T = tick_count::now() - t0;
    double avg = Tnum? Tsum/Tnum : 1;
    if (avg == 0.0) avg = 1;
    if(avg * 100 < T.seconds()) {
        REPORT("Warning: halting detected (%g sec, av: %g)\n", T.seconds(), avg);
        ASSERT(avg * 1000 > T.seconds(), "Too long halting period");
    } else {
        Tsum += T.seconds(); Tnum++;
    }
    REMARK("\t- in %f msec\n", T.seconds()*1000);
}

int TestMain () {
    MinThread = max(2, MinThread);
    int NumbersCount = 100;
    short recycle = 100;
    do {
        for(int threads = MinThread; threads <= MaxThread; threads++) {
            task_scheduler_init scheduler_init(threads);
            REMARK("Threads number is %d\t", threads);
            Measure("Shared serial (wrapper mutex)\t", SharedSerialFib<mutex>, NumbersCount);
            //sum = Measure("Shared serial (spin_mutex)", SharedSerialFib<tbb::spin_mutex>, NumbersCount);
            //sum = Measure("Shared serial (queuing_mutex)", SharedSerialFib<tbb::queuing_mutex>, NumbersCount);
        }
    } while(--recycle);
    return Harness::Done;
}
