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//------------------------------------------------------------------------------
// gbthreads: get/set the maximum # of threads to use in GraphBLAS
//------------------------------------------------------------------------------
// SuiteSparse:GraphBLAS, Timothy A. Davis, (c) 2017-2022, All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
//------------------------------------------------------------------------------
// Usage:
// nthreads = gbthreads
// nthreads = gbthreads (nthreads)
#include "gb_interface.h"
#define USAGE "usage: nthreads = GrB.threads ; or GrB.threads (nthreads)"
void mexFunction
(
int nargout,
mxArray *pargout [ ],
int nargin,
const mxArray *pargin [ ]
)
{
//--------------------------------------------------------------------------
// check inputs
//--------------------------------------------------------------------------
gb_usage (nargin <= 1 && nargout <= 1, USAGE) ;
//--------------------------------------------------------------------------
// set the # of threads, if requested
//--------------------------------------------------------------------------
int nthreads_max ;
if (nargin > 0)
{
// set the # of threads
CHECK_ERROR (!gb_mxarray_is_scalar (pargin [0]),
"input must be a scalar") ;
nthreads_max = (int) mxGetScalar (pargin [0]) ;
OK (GxB_Global_Option_set (GxB_NTHREADS, nthreads_max)) ;
}
//--------------------------------------------------------------------------
// return # of threads
//--------------------------------------------------------------------------
OK (GxB_Global_Option_get (GxB_NTHREADS, &nthreads_max)) ;
pargout [0] = mxCreateDoubleScalar (nthreads_max) ;
GB_WRAPUP ;
}
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