libc/src/sched/linux/sched_getcpucount.cpp

   1 //===-- Implementation of sched_getcpucount -------------------------------===//
   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-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/sched/sched_getcpucount.h"
  10
  11 #include "src/__support/common.h"
  12 #include "src/__support/macros/config.h"
  13
  14 #include <sched.h>
  15 #include <stddef.h>
  16
  17 namespace LIBC_NAMESPACE_DECL {
  18
  19 LLVM_LIBC_FUNCTION(int, __sched_getcpucount,
  20                    (size_t cpuset_size, const cpu_set_t *mask)) {
  21   int result = 0;
  22   for (size_t i = 0; i < cpuset_size / sizeof(long); ++i) {
  23     result += __builtin_popcountl(mask->__mask[i]);
  24   }
  25   return result;
  26 }
  27
  28 } // namespace LIBC_NAMESPACE_DECL