blis/sandbox/ref99/thread/blx_gemm_thread.c

/*

   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(s) of the copyright holder(s) 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"
#include "blix.h"

// This code is enabled only when multithreading is enabled via OpenMP.
#ifdef BLIS_ENABLE_OPENMP

void blx_gemm_thread
     (
       gemmint_t func,
       opid_t    family,
       obj_t*    a,
       obj_t*    b,
       obj_t*    c,
       cntx_t*   cntx,
       rntm_t*   rntm,
       cntl_t*   cntl
     )
{
	// Query the total number of threads from the context.
	dim_t       n_threads = bli_rntm_num_threads( rntm );

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

	_Pragma( "omp parallel num_threads(n_threads)" )
	{
		dim_t      id = omp_get_thread_num();

		obj_t      a_t, b_t, c_t;
		cntl_t*    cntl_use;
		thrinfo_t* thread;

		// Alias thread-local copies of A, B, and C. These will be the objects
		// we pass down the algorithmic function stack. Making thread-local
		// alaises IS ABSOLUTELY IMPORTANT and MUST BE DONE because each thread
		// will read the schemas from A and B and then reset the schemas to
		// their expected unpacked state (in blx_l3_cntl_create_if()).
		bli_obj_alias_to( a, &a_t );
		bli_obj_alias_to( b, &b_t );
		bli_obj_alias_to( c, &c_t );

		// Create a default control tree for the operation, if needed.
		blx_l3_cntl_create_if( family, &a_t, &b_t, &c_t, cntl, &cntl_use );

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

		func
		(
		  &a_t,
		  &b_t,
		  &c_t,
		  cntx,
		  rntm,
		  cntl_use,
		  thread
		);

		// Free the control tree, if one was created locally.
		blx_l3_cntl_free_if( &a_t, &b_t, &c_t, 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

#ifdef BLIS_ENABLE_PTHREADS
#error "Sandbox does not yet implement pthreads."
#endif

// This code is enabled only when multithreading is disabled.
#ifndef BLIS_ENABLE_MULTITHREADING

void blx_gemm_thread
     (
       gemmint_t func,
       opid_t    family,
       obj_t*    a,
       obj_t*    b,
       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;

	// Create a default control tree for the operation, if needed.
	blx_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
	(
	  a,
	  b,
	  c,
	  cntx,
	  rntm,
	  cntl_use,
	  thread
	);

	// Free the control tree, if one was created locally.
	blx_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