/*
    Copyright 2005-2014 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 "tbb/tbb_config.h"
#include "harness.h"

// Skip the test if no interoperability with cilkrts
#define __TBB_CILK_INTEROP   (__TBB_SURVIVE_THREAD_SWITCH && __INTEL_COMPILER>=1200)
// The compiler does not add "-lcilkrts" linker option on some linux systems
#define CILK_LINKAGE_BROKEN  (__linux__ && __GNUC__<4 && __INTEL_COMPILER_BUILD_DATE <= 20110427)
// In U4, cilkrts incorrectly sends the interop notifications to TBB
#define CILK_NOTIFICATIONS_BROKEN ( __INTEL_COMPILER_BUILD_DATE == 20110427 )

#if __TBB_CILK_INTEROP && !CILK_LINKAGE_BROKEN && !CILK_NOTIFICATIONS_BROKEN

static const int N = 14;
static const int P_outer = 4;
static const int P_nested = 2;

#include <cilk/cilk.h>
#include <cilk/cilk_api.h>
#define private public
#include "tbb/task.h"
#undef private
#include "tbb/task_scheduler_init.h"
#include <cstdio>
#include <cassert>

enum tbb_sched_injection_mode_t {
    tbbsched_none = 0,
    tbbsched_explicit_only = 1,
    tbbsched_auto_only = 2,
    tbbsched_mixed = 3
};

tbb_sched_injection_mode_t g_sim = tbbsched_none;

bool g_sandwich = false; // have to be declare before #include "test_cilk_common.h"
#include "test_cilk_common.h"

// A time delay routine
void Delay( int n ) {
    static volatile int Global;
    for( int k=0; k<10000; ++k )
        for( int i=0; i<n; ++i )
            ++Global;
}

int SerialFib( int n ) {
    int a=0, b=1;
    for( int i=0; i<n; ++i ) {
        b += a;
        a = b-a;
    }
    return a;
}

int F = SerialFib(N);

int Fib ( int n ) {
    if( n < 2 ) {
        if ( g_sim ) {
            tbb::task_scheduler_init tsi(P_nested);
        }
        return n;
    } else {
        tbb::task_scheduler_init *tsi = NULL;
        tbb::task *cur = NULL;
        if ( g_sim ) {
            if ( n % 2 == 0 ) {
                if ( g_sim == tbbsched_auto_only || (g_sim == tbbsched_mixed && n % 4 == 0) ) {
                    // Trigger TBB scheduler auto-initialization
                    cur = &tbb::task::self();
                }
                else {
                    ASSERT ( g_sim == tbbsched_explicit_only || (g_sim == tbbsched_mixed && n % 4 != 0), NULL );
                    // Initialize TBB scheduler explicitly
                    tsi = new tbb::task_scheduler_init(P_nested);
                }
            }
        }
        int x, y;
        x = cilk_spawn Fib(n-2);
        y = cilk_spawn Fib(n-1);
        cilk_sync;
        if ( tsi )
            delete tsi;
        return x+y;
    }
}

void RunCilkOnly ( tbb_sched_injection_mode_t sim ) {
    g_sim = sim;
    int m = Fib(N);
    ASSERT( m == F, NULL );
}

struct FibBody : NoAssign, Harness::NoAfterlife {
    void operator() ( int ) const {
        int m = Fib(N);
        ASSERT( m == F, NULL );
    }
};

void RunCilkOnlyConcurrently ( tbb_sched_injection_mode_t sim ) {
    g_sim = sim;
    NativeParallelFor( P_outer, FibBody() );
}

void RunSandwich( bool sandwich ) { 
    g_sandwich = sandwich;
    tbb::task_scheduler_init init(P_outer);
    int m = TBB_Fib(N);
    ASSERT( g_sandwich == sandwich, "Memory corruption detected" );
    ASSERT( m == F, NULL );
}

int TestMain () {
    for ( int i = 0; i < 100; ++i )
        RunCilkOnlyConcurrently( tbbsched_none );
    RunCilkOnly( tbbsched_none );
    RunCilkOnly( tbbsched_explicit_only );
    RunCilkOnly( tbbsched_auto_only );
    RunCilkOnly( tbbsched_mixed );
    RunSandwich( false );
    for ( int i = 0; i < 10; ++i )
        RunSandwich( true );
    __cilkrts_end_cilk();
    return Harness::Done;
}

#else /* !__TBB_CILK_INTEROP */

int TestMain () {
    return Harness::Skipped;
}

#endif /* !__TBB_CILK_INTEROP */
