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// ==========================================================================
// SeqAn - The Library for Sequence Analysis
// ==========================================================================
// Copyright (c) 2006-2026, Knut Reinert, FU Berlin
// All rights reserved.
//
// 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 Knut Reinert or the FU Berlin 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 KNUT REINERT OR THE FU BERLIN 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.
//
// ==========================================================================
// Author: Manuel Holtgrewe <manuel.holtgrewe@fu-berlin.de>
// Author: Enrico Siragusa <enrico.siragusa@fu-berlin.de>
// ==========================================================================
// Utility macros for parallelism.
// ==========================================================================
#ifndef SEQAN_PARALLEL_PARALLEL_MACROS_H_
#define SEQAN_PARALLEL_PARALLEL_MACROS_H_
/*!
* @macro SEQAN_OMP_PRAGMA
* @headerfile <seqan/parallel.h>
* @brief Portable conditional <tt>#pragma</tt> issuing if OpenMP is enabled.
*
* @signature SEQAN_OMP_PRAGMA(x)
*
* @param x The string to issue behind <tt>#pragma omp</tt>.
*
* @section Remarks
*
* This macro uses portable pragma generation, dependent on the macro <tt>_OPENMP</tt> being defined (as by
* the OpenMP standard).
*
* This is useful for disabling OpenMP pragmas on compilers that do not support OpenMP or when OpenMP is not enabled to
* suppress warnings.
*
* @section Example
*
* Parallelize loop with OpenMP if OpenMP is enabled:
*
* @code{.cpp}
* SEQAN_OMP_PRAGMA(parallel for) // becomes: #pragma omp parallel for
* for (int i = 0; i < x; ++i)
* {
* // Do work.
* }
* @endcode
*
* Make an addition atomic if OpenMP is enabled:
*
* @code{.cpp}
* SEQAN_OMP_PRAGMA(parallel atomic) // becomes: #pragma omp parallel atomic
* i += 1;
* @endcode
*/
#ifdef _OPENMP
#include <omp.h>
#if defined(COMPILER_MSVC) || defined(COMPILER_WINTEL)
// MSVC __pragma-operator
#define SEQAN_OMP_PRAGMA(x) __pragma(omp x)
#else
// GCC _Pragma operator
#define SEQAN_DO_PRAGMA(x) _Pragma(# x)
#define SEQAN_OMP_PRAGMA(x) SEQAN_DO_PRAGMA(omp x)
#endif
#else // #ifdef _OPENMP
#define SEQAN_OMP_PRAGMA(x)
// low-level OpenMP runtime compatibility
inline void omp_set_num_threads(int)
{}
inline int omp_get_num_threads()
{
return 1;
}
inline int omp_get_max_threads()
{
return 1;
}
inline int omp_get_thread_num()
{
return 0;
}
inline double omp_get_wtime()
{
return seqan2::sysTime();
}
#endif // #ifdef _OPENMP
// ----------------------------------------------------------------------------
// Function getThreadId()
// ----------------------------------------------------------------------------
inline unsigned getThreadId()
{
#if defined(_OPENMP)
return omp_get_thread_num();
#else
return 0;
#endif
}
#endif // SEQAN_PARALLEL_PARALLEL_MACROS_H_
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