/*

   BLIS
   An object-based framework for developing high-performance BLAS-like
   libraries.

   Copyright (C) 2014, The University of Texas at Austin

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are
   met:
    - Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    - Redistributions in binary form must reproduce the above copyright
      notice, this list of conditions and the following disclaimer in the
      documentation and/or other materials provided with the distribution.
    - Neither the name of The University of Texas at Austin nor the names
      of its contributors may be used to endorse or promote products
      derived from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

*/

#include "blis.h"

#ifndef BLIS_ENABLE_MULTITHREADING

//Constructors and destructors for constructors
thrcomm_t* bli_thrcomm_create( dim_t n_threads )
{
	thrcomm_t* comm = bli_malloc_intl( sizeof( thrcomm_t ) );
	bli_thrcomm_init( comm, n_threads );
	return comm;
}

void bli_thrcomm_free( thrcomm_t* comm )
{
	if ( comm == NULL ) return;
	bli_thrcomm_cleanup( comm );
	bli_free_intl( comm );
}

void bli_thrcomm_init( thrcomm_t* comm, dim_t n_threads )
{
	if ( comm == NULL ) return;

	comm->sent_object             = NULL;
	comm->n_threads               = n_threads;
	comm->barrier_sense           = 0;
	comm->barrier_threads_arrived = 0;
}

void bli_thrcomm_cleanup( thrcomm_t* comm )
{
	if ( comm == NULL ) return;
}

void bli_thrcomm_barrier( thrcomm_t* comm, dim_t t_id )
{
	return;
}

// Define a dummy function bli_l3_thread_entry(), which is needed in the
// pthreads version, so that when building Windows DLLs (with OpenMP enabled
// or no multithreading) we don't risk having an unresolved symbol.
void* bli_l3_thread_entry( void* data_void ) { return NULL; }

void bli_l3_thread_decorator
     (
       l3int_t     func,
       opid_t      family,
       obj_t*      alpha,
       obj_t*      a,
       obj_t*      b,
       obj_t*      beta,
       obj_t*      c,
       cntx_t*     cntx,
       rntm_t*     rntm,
       cntl_t*     cntl
     )
{
	// For sequential execution, we use only one thread.
	dim_t      n_threads = 1;
	dim_t      id        = 0;

	// Allcoate a global communicator for the root thrinfo_t structures.
	thrcomm_t* gl_comm   = bli_thrcomm_create( n_threads );

	cntl_t*    cntl_use;
	thrinfo_t* thread;

	// NOTE: Unlike with the _openmp.c and _pthreads.c variants, we don't
	// need to alias objects for A, B, and C since they were already aliased
	// in bli_*_front(). However, we may add aliasing here in the future so
	// that, with all three (_single.c, _openmp.c, _pthreads.c) implementations
	// consistently providing local aliases, we can then eliminate aliasing
	// elsewhere.

	// Create a default control tree for the operation, if needed.
	bli_l3_cntl_create_if( family, a, b, c, cntl, &cntl_use );

	// Create the root node of the thread's thrinfo_t structure.
	bli_l3_thrinfo_create_root( id, gl_comm, rntm, cntl_use, &thread );

	func
	(
	  alpha,
	  a,
	  b,
	  beta,
	  c,
	  cntx,
	  rntm,
	  cntl_use,
	  thread
	);

	// Free the control tree, if one was created locally.
	bli_l3_cntl_free_if( a, b, c, cntl, cntl_use, thread );

	// Free the current thread's thrinfo_t structure.
	bli_l3_thrinfo_free( thread );

	// We shouldn't free the global communicator since it was already freed
	// by the global communicator's chief thread in bli_l3_thrinfo_free()
	// (called above).
}


#endif

