| 1 | //===-- Implementation of sched_getcpuisset -------------------------------===// |
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| 2 | // |
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| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
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| 4 | // See https://llvm.org/LICENSE.txt for license information. |
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| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
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| 6 | // |
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| 7 | //===----------------------------------------------------------------------===// |
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| 8 | |
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| 9 | #include "src/sched/sched_getcpuisset.h" |
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| 10 | |
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| 11 | #include "src/__support/common.h" // LLVM_LIBC_FUNCTION |
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| 12 | #include "src/__support/macros/config.h" // LIBC_NAMESPACE_DECL |
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| 13 | #include "src/__support/macros/null_check.h" // LIBC_CRASH_ON_NULLPTR |
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| 14 | |
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| 15 | #include "hdr/sched_macros.h" // NCPUBITS |
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| 16 | #include "hdr/types/cpu_set_t.h" |
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| 17 | #include "hdr/types/size_t.h" |
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| 18 | |
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| 19 | namespace LIBC_NAMESPACE_DECL { |
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| 20 | |
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| 21 | LLVM_LIBC_FUNCTION(int, __sched_getcpuisset, |
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| 22 | (int cpu, const size_t cpuset_size, cpu_set_t *set)) { |
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| 23 | LIBC_CRASH_ON_NULLPTR(set); |
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| 24 | |
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| 25 | if (static_cast<size_t>(cpu) / 8 < cpuset_size) { |
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| 26 | const size_t element_index = static_cast<size_t>(cpu) / NCPUBITS; |
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| 27 | const size_t bit_position = static_cast<size_t>(cpu) % NCPUBITS; |
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| 28 | |
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| 29 | const unsigned long mask = 1UL << bit_position; |
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| 30 | return (set->__mask[element_index] & mask) != 0; |
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| 31 | } |
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| 32 | |
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| 33 | return 0; |
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| 34 | } |
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| 35 | |
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| 36 | } // namespace LIBC_NAMESPACE_DECL |
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| 37 | |
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