You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: os_aix.go
    path of file: ./repos/gccrs/libgo/go/runtime
    
    the code of the file until where you have to start completion: // Copyright 2018 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

//go:build aix

package runtime

import (
	"unsafe"
)

//extern sysconf
func sysconf(int32) _C_long

type mOS struct {
	waitsema uintptr // semaphore for parking on locks
}

func getProcID() uint64 {
	return uint64(gettid())
}

//extern malloc
func libc_malloc(uintptr) unsafe.Pointer

//go:noescape
//extern sem_init
func sem_init(sem *semt, pshared int32, value uint32) int32

//go:noescape
//extern sem_wait
func sem_wait(sem *semt) int32

//go:noescape
//extern sem_post
func sem_post(sem *semt) int32

//go:noescape
//extern sem_timedwait
func sem_timedwait(sem *semt, timeout *timespec) int32

//go:noescape
//extern clock_gettime
func clock_gettime(
    
func semasleep(ns int64) int32 {
	mp := getg().m
	if ns >= 0 {
		var ts timespec

		if clock_gettime(_CLOCK_REALTIME, &ts) != 0 {
			throw("clock_gettime")
		}

		sec := int64(ts.tv_sec) + ns/1e9
		nsec := int64(ts.tv_nsec) + ns%1e9
		if nsec >= 1e9 {
			sec++
			nsec -= 1e9
		}
		if sec != int64(timespec_sec_t(sec)) {
			// Handle overflows (timespec_sec_t is 32-bit in 32-bit applications)
			sec = 1<<31 - 1
		}
		ts.tv_sec = timespec_sec_t(sec)
		ts.tv_nsec = timespec_nsec_t(nsec)

		if sem_timedwait((*semt)(unsafe.Pointer(mp.waitsema)), &ts) != 0 {
			err := errno()
			if err == _ETIMEDOUT || err == _EAGAIN || err == _EINTR {
				return -1
			}
			println("sem_timedwait err ", err, " ts.tv_sec ", ts.tv_sec, " ts.tv_nsec ", ts.tv_nsec, " ns ", ns, " id ", mp.id)
			throw("sem_timedwait")
		}
		return 0
	}
	for {
		r1 := sem_wait((*semt)(unsafe.Pointer(mp.waitsema)))
		if r1 == 0 {
			break
		}
		if errno() == _EINTR {
			continue
		}
		throw("sem_wait")
	}
	return 0
}