37 lines · cpp
1//===-- Implementation of sched_getcpuisset -------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/sched/sched_getcpuisset.h"10 11#include "src/__support/common.h" // LLVM_LIBC_FUNCTION12#include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL13#include "src/__support/macros/null_check.h" // LIBC_CRASH_ON_NULLPTR14 15#include "hdr/sched_macros.h" // NCPUBITS16#include "hdr/types/cpu_set_t.h"17#include "hdr/types/size_t.h"18 19namespace LIBC_NAMESPACE_DECL {20 21LLVM_LIBC_FUNCTION(int, __sched_getcpuisset,22 (int cpu, const size_t cpuset_size, cpu_set_t *set)) {23 LIBC_CRASH_ON_NULLPTR(set);24 25 if (static_cast<size_t>(cpu) / 8 < cpuset_size) {26 const size_t element_index = static_cast<size_t>(cpu) / NCPUBITS;27 const size_t bit_position = static_cast<size_t>(cpu) % NCPUBITS;28 29 const unsigned long mask = 1UL << bit_position;30 return (set->__mask[element_index] & mask) != 0;31 }32 33 return 0;34}35 36} // namespace LIBC_NAMESPACE_DECL37