34 lines · cpp
1//===-- Implementation of sched_setcpuset ---------------------------------===//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_setcpuset.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(void, __sched_setcpuset,22 (int cpu, const size_t cpuset_size, cpu_set_t *set)) {23 LIBC_CRASH_ON_NULLPTR(set);24 if (static_cast<size_t>(cpu) / 8 < cpuset_size) {25 const size_t element_index = static_cast<size_t>(cpu) / NCPUBITS;26 const size_t bit_position = static_cast<size_t>(cpu) % NCPUBITS;27 28 const unsigned long mask = 1UL << bit_position;29 set->__mask[element_index] |= mask;30 }31}32 33} // namespace LIBC_NAMESPACE_DECL34