5d4439cc3e
release/17.x branch, commit 8f4dd44097c9ae25dd203d5ac87f3b48f854bba8 This adds the flag `-D_LIBCPP_PSTL_CPU_BACKEND_SERIAL`. A future enhancement could possibly pass something different if there is a compelling parallel implementation. That libdispatch one might be worth looking into.
51 lines
1.4 KiB
C++
Vendored
51 lines
1.4 KiB
C++
Vendored
// -*- C++ -*-
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// -*-===----------------------------------------------------------------------===//
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//
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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//
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//===----------------------------------------------------------------------===//
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#ifndef _PSTL_INTERNAL_OMP_PARALLEL_INVOKE_H
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#define _PSTL_INTERNAL_OMP_PARALLEL_INVOKE_H
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#include "util.h"
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namespace __pstl
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{
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namespace __omp_backend
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{
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template <typename _F1, typename _F2>
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void
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__parallel_invoke_body(_F1&& __f1, _F2&& __f2)
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{
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_PSTL_PRAGMA(omp taskgroup)
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{
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_PSTL_PRAGMA(omp task untied mergeable) { std::forward<_F1>(__f1)(); }
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_PSTL_PRAGMA(omp task untied mergeable) { std::forward<_F2>(__f2)(); }
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}
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}
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template <class _ExecutionPolicy, typename _F1, typename _F2>
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void
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__parallel_invoke(__pstl::__internal::__openmp_backend_tag, _ExecutionPolicy&&, _F1&& __f1, _F2&& __f2)
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{
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if (omp_in_parallel())
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{
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__pstl::__omp_backend::__parallel_invoke_body(std::forward<_F1>(__f1), std::forward<_F2>(__f2));
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}
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else
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{
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_PSTL_PRAGMA(omp parallel)
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_PSTL_PRAGMA(omp single nowait)
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__pstl::__omp_backend::__parallel_invoke_body(std::forward<_F1>(__f1), std::forward<_F2>(__f2));
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}
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}
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} // namespace __omp_backend
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} // namespace __pstl
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#endif // _PSTL_INTERNAL_OMP_PARALLEL_INVOKE_H
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