libc/src/sched/linux/sched_yield.cpp

   1 //===-- Implementation of sched_yield -------------------------------------===//
   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_yield.h"
  10
  11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function.
  12 #include "src/__support/common.h"
  13 #include "src/__support/macros/config.h"
  14 #include "src/errno/libc_errno.h"
  15
  16 #include <sys/syscall.h> // For syscall numbers.
  17
  18 namespace LIBC_NAMESPACE_DECL {
  19
  20 LLVM_LIBC_FUNCTION(int, sched_yield, ()) {
  21   int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_sched_yield);
  22   // As of writing this, yield() cannot fail
  23   if (ret < 0) {
  24     libc_errno = -ret;
  25     return -1;
  26   }
  27   return 0;
  28 }
  29
  30 } // namespace LIBC_NAMESPACE_DECL