throw("sem_timedwait")
		}
		return 0
	}
	for {
		r1, err := sem_wait((*semt)(unsafe.Pointer(mp.waitsema)))
		if r1 == 0 {
			break
		}
		if err == _EINTR {
			continue
		}
		throw("sem_wait")
	}
	return 0
}

//go:nosplit
func semawakeup(mp *m) {
	if sem_post((*semt)(unsafe.Pointer(mp.waitsema))) != 0 {
		throw("sem_post")

//go:cgo_import_dynamic libc_sched_yield sched_yield "libc.so"
//go:cgo_import_dynamic libc_sem_init sem_init "libc.so"
//go:cgo_import_dynamic libc_sem_post sem_post "libc.so"
//go:cgo_import_dynamic libc_sem_reltimedwait_np sem_reltimedwait_np "libc.so"
//go:cgo_import_dynamic libc_sem_wait sem_wait "libc.so"
//go:cgo_import_dynamic libc_setitimer setitimer "libc.so"
//go:cgo_import_dynamic libc_sigaction sigaction "libc.so"

//go:cgo_import_dynamic libc_sched_yield sched_yield "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_sem_init sem_init "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_sem_post sem_post "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_sem_timedwait sem_timedwait "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_sem_wait sem_wait "libc.a/shr_64.o"
//go:cgo_import_dynamic libc_setitimer setitimer "libc.a/shr_64.o"

				Gosched()
			}
		}()
	}

	wg.Add(1)
	go func() {
		defer wg.Done()
		Semacquire(&sema)
		atomic.CompareAndSwapUint32(&res, 0, 1)

		Semrelease1(&sema, true, 0)
		close(done)
	}()
	for SemNwait(&sema) == 0 {
		Gosched() // wait for goroutine to block in Semacquire
	}

	// The crux of the test: we release the semaphore with handoff
	// and immediately perform a CAS both here and in the waiter; we

	}
	return sendfile(outfd, infd, offset, count)
}

func Fstatvfs(fd int, buf *Statvfs_t) (err error) {
	return Fstatvfs1(fd, buf, ST_WAIT)
}

func Statvfs(path string, buf *Statvfs_t) (err error) {
	return Statvfs1(path, buf, ST_WAIT)
}

/*
 * Exposed directly
 */
//sys	Access(path string, mode uint32) (err error)
//sys	Adjtime(delta *Timeval, olddelta *Timeval) (err error)

	Namlen    uint16
	Type      uint8
	Name      [512]int8
	Pad_cgo_0 [3]byte
}

type Fsid struct {
	X__fsid_val [2]int32
}

const (
	PathMax = 0x400
)

const (
	ST_WAIT   = 0x1
	ST_NOWAIT = 0x2
)

const (
	FADV_NORMAL     = 0x0
	FADV_RANDOM     = 0x1
	FADV_SEQUENTIAL = 0x2
	FADV_WILLNEED   = 0x3
	FADV_DONTNEED   = 0x4
	FADV_NOREUSE    = 0x5
)

	Namlen    uint16
	Type      uint8
	Name      [512]int8
	Pad_cgo_0 [3]byte
}

type Fsid struct {
	X__fsid_val [2]int32
}

const (
	PathMax = 0x400
)

const (
	ST_WAIT   = 0x1
	ST_NOWAIT = 0x2
)

const (
	FADV_NORMAL     = 0x0
	FADV_RANDOM     = 0x1
	FADV_SEQUENTIAL = 0x2
	FADV_WILLNEED   = 0x3
	FADV_DONTNEED   = 0x4
	FADV_NOREUSE    = 0x5
)

	Namlen    uint16
	Type      uint8
	Name      [512]int8
	Pad_cgo_0 [3]byte
}

type Fsid struct {
	X__fsid_val [2]int32
}

const (
	PathMax = 0x400
)

const (
	ST_WAIT   = 0x1
	ST_NOWAIT = 0x2
)

const (
	FADV_NORMAL     = 0x0
	FADV_RANDOM     = 0x1
	FADV_SEQUENTIAL = 0x2
	FADV_WILLNEED   = 0x3
	FADV_DONTNEED   = 0x4
	FADV_NOREUSE    = 0x5
)

	Namlen    uint16
	Type      uint8
	Name      [512]int8
	Pad_cgo_0 [3]byte
}

type Fsid struct {
	X__fsid_val [2]int32
}

const (
	PathMax = 0x400
)

const (
	ST_WAIT   = 0x1
	ST_NOWAIT = 0x2
)

const (
	FADV_NORMAL     = 0x0
	FADV_RANDOM     = 0x1
	FADV_SEQUENTIAL = 0x2
	FADV_WILLNEED   = 0x3
	FADV_DONTNEED   = 0x4
	FADV_NOREUSE    = 0x5
)

	SYS_KSEM_CLOSE               = 400 // { int ksem_close(semid_t id); }
	SYS_KSEM_POST                = 401 // { int ksem_post(semid_t id); }
	SYS_KSEM_WAIT                = 402 // { int ksem_wait(semid_t id); }
	SYS_KSEM_TRYWAIT             = 403 // { int ksem_trywait(semid_t id); }
	SYS_KSEM_INIT                = 404 // { int ksem_init(semid_t *idp, unsigned int value); }