| // -*- C++ -*- |
| //===----------------------------------------------------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef _LIBCPP_SUPPORT_IBM_NANOSLEEP_H |
| #define _LIBCPP_SUPPORT_IBM_NANOSLEEP_H |
| |
| #include <unistd.h> |
| |
| inline int nanosleep(const struct timespec* req, struct timespec* rem) |
| { |
| // The nanosleep() function is not available on z/OS. Therefore, we will call |
| // sleep() to sleep for whole seconds and usleep() to sleep for any remaining |
| // fraction of a second. Any remaining nanoseconds will round up to the next |
| // microsecond. |
| |
| useconds_t __micro_sec = (rem->tv_nsec + 999) / 1000; |
| if (__micro_sec > 999999) |
| { |
| ++rem->tv_sec; |
| __micro_sec -= 1000000; |
| } |
| while (rem->tv_sec) |
| rem->tv_sec = sleep(rem->tv_sec); |
| if (__micro_sec) { |
| rem->tv_nsec = __micro_sec * 1000; |
| return usleep(__micro_sec); |
| } |
| rem->tv_nsec = 0; |
| return 0; |
| } |
| |
| #endif // _LIBCPP_SUPPORT_IBM_NANOSLEEP_H |
