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
  13 #include <sched.h>
  14 #include <stddef.h>
  15
  16 namespace LIBC_NAMESPACE {
  17
  18 LLVM_LIBC_FUNCTION(int, __sched_getcpucount,
  19                    (size_t cpuset_size, const cpu_set_t *mask)) {
  20   int result = 0;
  21   for (size_t i = 0; i < cpuset_size / sizeof(long); ++i) {
  22     result += __builtin_popcountl(mask->__mask[i]);
  23   }
  24   return result;
  25 }
  26
  27 } // namespace LIBC_NAMESPACE