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