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/errno/libc_errno.h"
  14
  15 #include <sys/syscall.h> // For syscall numbers.
  16
  17 namespace __llvm_libc {
  18
  19 LLVM_LIBC_FUNCTION(int, sched_yield, ()) {
  20   int ret = __llvm_libc::syscall_impl<int>(SYS_sched_yield);
  21   // As of writing this, yield() cannot fail
  22   if (ret < 0) {
  23     libc_errno = -ret;
  24     return -1;
  25   }
  26   return 0;
  27 }
  28
  29 } // namespace __llvm_libc