diff --git a/include/Makefile b/include/Makefile
index b444184ab8c6..7f4df4fb837d 100644
--- a/include/Makefile
+++ b/include/Makefile
@@ -1,473 +1,474 @@
 #	@(#)Makefile	8.2 (Berkeley) 1/4/94
 # $FreeBSD$
 #
 # Doing a "make install" builds /usr/include.
 
 .include <src.opts.mk>
 
 PACKAGE=runtime
 CLEANFILES= osreldate.h version
 SUBDIR= arpa protocols rpcsvc rpc xlocale
 SUBDIR_PARALLEL=
 INCS=	a.out.h ar.h assert.h bitstring.h complex.h cpio.h _ctype.h ctype.h \
 	db.h \
 	dirent.h dlfcn.h elf.h elf-hints.h err.h fmtmsg.h fnmatch.h fstab.h \
 	fts.h ftw.h getopt.h glob.h grp.h \
 	ieeefp.h ifaddrs.h \
 	inttypes.h iso646.h kenv.h langinfo.h libgen.h limits.h link.h \
 	locale.h malloc.h malloc_np.h memory.h monetary.h mpool.h mqueue.h \
 	ndbm.h netconfig.h \
 	netdb.h nl_types.h nlist.h nss.h nsswitch.h paths.h \
 	printf.h proc_service.h pthread.h \
 	pthread_np.h pwd.h ranlib.h readpassphrase.h regex.h \
-	res_update.h resolv.h runetype.h search.h semaphore.h setjmp.h \
+	res_update.h resolv.h runetype.h sched.h \
+	search.h semaphore.h setjmp.h \
 	signal.h spawn.h stab.h stdalign.h stdbool.h stddef.h \
 	stdnoreturn.h stdio.h stdlib.h string.h stringlist.h \
 	strings.h sysexits.h tar.h termios.h tgmath.h \
 	time.h timeconv.h timers.h ttyent.h \
 	uchar.h ulimit.h unistd.h utime.h utmpx.h uuid.h varargs.h \
 	wchar.h wctype.h wordexp.h xlocale.h
 
 .PATH: ${SRCTOP}/contrib/libc-vis
 INCS+=	vis.h
 
 MHDRS=	float.h floatingpoint.h stdarg.h
 
-PHDRS=	sched.h _semaphore.h
+PHDRS=	_semaphore.h
 
 LHDRS=	aio.h errno.h fcntl.h linker_set.h poll.h stdatomic.h stdint.h \
 	syslog.h ucontext.h
 
 LDIRS=	geom net net80211 netgraph netinet netinet6 \
 	netipsec netsmb nfs nfsclient nfsserver sys vm
 
 LSUBDIRS=	dev/acpica dev/agp dev/an dev/ciss dev/filemon dev/firewire \
 	dev/hwpmc dev/hyperv \
 	dev/ic dev/iicbus dev/io dev/mfi dev/mmc dev/nvme \
 	dev/ofw dev/pbio dev/pci ${_dev_powermac_nvram} dev/ppbus dev/pwm \
 	dev/smbus dev/speaker dev/tcp_log dev/veriexec dev/vkbd \
 	fs/devfs fs/fdescfs fs/msdosfs fs/nfs fs/nullfs \
 	fs/procfs fs/smbfs fs/udf fs/unionfs \
 	geom/cache geom/concat geom/eli geom/gate geom/journal geom/label \
 	geom/mirror geom/mountver geom/multipath geom/nop \
 	geom/raid geom/raid3 geom/shsec geom/stripe geom/virstor \
 	net/altq \
 	net/route \
 	netgraph/atm netgraph/netflow \
 	netinet/cc \
 	netinet/netdump \
 	netinet/tcp_stacks \
 	security/mac_biba security/mac_bsdextended security/mac_lomac \
 	security/mac_mls security/mac_partition \
 	security/mac_veriexec \
 	sys/disk \
 	ufs/ffs ufs/ufs
 
 LSUBSUBDIRS=	dev/mpt/mpilib
 
 .PATH: ${SRCTOP}/sys/dev/acpica
 ACPICA=		acpi_hpet.h \
 		acpiio.h
 ACPICADIR=	${INCLUDEDIR}/dev/acpica
 
 .PATH: ${SRCTOP}/sys/dev/agp
 AGP=		agpreg.h
 AGPDIR=		${INCLUDEDIR}/dev/agp
 
 .PATH: ${SRCTOP}/sys/bsm
 BSM=		audit.h \
 		audit_errno.h \
 		audit_internal.h \
 		audit_record.h \
 		audit_domain.h \
 		audit_fcntl.h \
 		audit_kevents.h \
 		audit_socket_type.h
 BSMPACKAGE=	libbsm
 BSMDIR=		${INCLUDEDIR}/bsm
 
 .PATH: ${SRCTOP}/sys/security/audit
 SECAUDIT=	audit.h \
 		audit_ioctl.h \
 		audit_private.h
 SECAUDITPACKAGE=	libbsm
 SECAUDITDIR=	${INCLUDEDIR}/security/audit
 
 .PATH:	${SRCTOP}/sys/cam
 CAM=	cam.h \
 	cam_ccb.h \
 	cam_compat.h \
 	cam_debug.h \
 	cam_iosched.h \
 	cam_periph.h \
 	cam_queue.h \
 	cam_sim.h \
 	cam_xpt.h \
 	cam_xpt_internal.h \
 	cam_xpt_periph.h \
 	cam_xpt_sim.h
 CAMDIR=	${INCLUDEDIR}/cam
 
 .PATH: ${SRCTOP}/sys/cam/ata
 CAMATA=		ata_all.h
 CAMATADIR=	${INCLUDEDIR}/cam/ata
 
 .PATH: ${SRCTOP}/sys/cam/mmc
 CAMMMC=		mmc.h \
 		mmc_bus.h \
 		mmc_all.h
 CAMMMCDIR=	${INCLUDEDIR}/cam/mmc
 
 .PATH: ${SRCTOP}/sys/cam/nvme
 CAMNVME=	nvme_all.h
 CAMNVMEDIR=	${INCLUDEDIR}/cam/nvme
 
 .PATH: ${SRCTOP}/sys/cam/scsi
 CAMSCSI=	scsi_all.h \
 		scsi_cd.h \
 		scsi_ch.h \
 		scsi_da.h \
 		scsi_enc.h \
 		scsi_enc_internal.h \
 		scsi_iu.h \
 		scsi_message.h \
 		scsi_pass.h \
 		scsi_pt.h \
 		scsi_sa.h \
 		scsi_ses.h \
 		scsi_sg.h \
 		scsi_targetio.h \
 		smp_all.h
 CAMSCSIDIR=	${INCLUDEDIR}/cam/scsi
 
 .PATH: ${SRCTOP}/sys/fs/cd9660
 FS9660=		cd9660_mount.h \
 		cd9660_node.h \
 		cd9660_rrip.h \
 		iso.h \
 		iso_rrip.h
 FS9660DIR=	${INCLUDEDIR}/isofs/cd9660
 
 .PATH: ${SRCTOP}/sys/dev/evdev
 EVDEV=		input.h \
 		input-event-codes.h \
 		uinput.h
 EVDEVDIR=	${INCLUDEDIR}/dev/evdev
 
 .PATH: ${SRCTOP}/sys/dev/hid
 HID=		hid.h \
 		hidraw.h
 HIDDIR=		${INCLUDEDIR}/dev/hid
 
 .PATH: ${SRCTOP}/sys/dev/hyperv/include ${SRCTOP}/sys/dev/hyperv/utilities
 HYPERV=		hv_snapshot.h \
 		hyperv.h
 HYPERVDIR=	${INCLUDEDIR}/dev/hyperv
 
 .PATH: ${SRCTOP}/sys/opencrypto
 OPENCRYPTO=	cryptodev.h
 OPENCRYPTODIR=	${INCLUDEDIR}/crypto
 
 .PATH: ${SRCTOP}/sys/dev/pci
 PCI=		pcireg.h
 PCIDIR=		${INCLUDEDIR}/dev/pci
 
 .PATH: ${SRCTOP}/sys/dev/veriexec
 VERIEXEC=	veriexec_ioctl.h
 VERIEXECDIR=	${INCLUDEDIR}/dev/veriexec
 
 .PATH: ${SRCTOP}/sys/contrib/ipfilter/netinet
 IPFILTER=	ip_auth.h \
 		ip_compat.h \
 		ip_dstlist.h \
 		ip_fil.h \
 		ip_frag.h \
 		ip_htable.h \
 		ip_lookup.h \
 		ip_nat.h \
 		ip_pool.h \
 		ip_proxy.h \
 		ip_rules.h \
 		ip_scan.h \
 		ip_state.h \
 		ip_sync.h \
 		ipf_rb.h \
 		ipl.h \
 		radix_ipf.h
 IPFILTERDIR=	${INCLUDEDIR}/netinet
 
 .PATH: ${SRCTOP}/sys/netpfil/pf
 PF=		pf.h \
 		pf_altq.h \
 		pf_mtag.h
 PFPACKAGE=	pf
 PFDIR=	${INCLUDEDIR}/netpfil/pf
 
 .PATH: ${SRCTOP}/sys/rpc
 RPC=		rpcsec_tls.h \
 		types.h
 RPCDIR=		${INCLUDEDIR}/rpc
 
 .PATH: ${SRCTOP}/sys/teken
 TEKEN=		teken.h
 TEKENDIR=	${INCLUDEDIR}/teken
 
 .PATH: ${SRCTOP}/sys/contrib/openzfs/include/sys
 NVPAIR=		nvpair.h
 NVPAIRDIR=	${INCLUDEDIR}/sys
 
 .PATH: ${SRCTOP}/sys/dev/mlx5
 MLX5=		mlx5io.h
 MLX5DIR=	${INCLUDEDIR}/dev/mlx5
 
 INCSGROUPS=	INCS \
 		ACPICA \
 		AGP \
 		BSM \
 		CAM \
 		CAMATA \
 		CAMMMC \
 		CAMNVME \
 		CAMSCSI \
 		CRYPTO \
 		EVDEV \
 		FS9660 \
 		HID \
 		HYPERV \
 		OPENCRYPTO \
 		PCI \
 		RPC \
 		SECAUDIT \
 		TEKEN \
 		VERIEXEC
 
 .if ${MK_IPFILTER} != "no"
 INCSGROUPS+=	IPFILTER
 .endif
 
 .if ${MK_PF} != "no"
 INCSGROUPS+=	PF
 .endif
 
 .if ${MK_CDDL} != "no"
 INCSGROUPS+=	NVPAIR
 .endif
 
 .if ${MK_MLX5TOOL} != "no"
 INCSGROUPS+=	MLX5
 .endif
 
 .if ${MK_BLUETOOTH} != "no"
 LSUBSUBDIRS+=	netgraph/bluetooth/include
 .endif
 
 .if ${MK_CUSE} != "no"
 LSUBDIRS+=	fs/cuse
 .endif
 
 .if ${MK_GSSAPI} != "no"
 SUBDIR+=	gssapi
 INCS+=		gssapi.h
 .endif
 
 .if ${MK_HESIOD} != "no"
 INCS+=	hesiod.h
 .endif
 
 # Handle the #define aliases for libiconv
 .if ${MK_ICONV} == "yes"
 INCS+=		iconv.h
 .endif
 
 .if ${MK_USB} != "no"
 LSUBDIRS+=	dev/usb
 .endif
 
 .if ${MACHINE_CPUARCH} == "powerpc" && ${MACHINE_ARCH} != "powerpcspe"
 _dev_powermac_nvram=	dev/powermac_nvram
 .endif
 
 # Define SHARED to indicate whether you want symbolic links to the system
 # source (``symlinks''), or a separate copy (``copies'').  ``symlinks'' is
 # probably only useful for developers and should be avoided if you do not
 # wish to tie your /usr/include and /usr/src together.
 #SHARED=	symlinks
 SHARED?=	copies
 
 INCS+=	osreldate.h
 
 SYSDIR=			${SRCTOP}/sys
 NEWVERS_SH=		${SYSDIR}/conf/newvers.sh
 PARAM_H=		${SYSDIR}/sys/param.h
 MK_OSRELDATE_SH=	${.CURDIR}/mk-osreldate.sh
 
 SYMLINKS+= ${LIBDIR:C,[^/]+,..,g:C,^/,,}${INCLUDEDIR} ${LIBDIR}/include
 
 osreldate.h: ${NEWVERS_SH} ${PARAM_H} ${MK_OSRELDATE_SH}
 	env NEWVERS_SH=${NEWVERS_SH} PARAMFILE=${PARAM_H} SYSDIR=${SYSDIR} \
 	    sh ${MK_OSRELDATE_SH}
 
 .for i in ${LHDRS}
 INCSLINKS+=	sys/$i ${INCLUDEDIR}/$i
 .endfor
 .for i in ${MHDRS}
 INCSLINKS+=	machine/$i ${INCLUDEDIR}/$i
 .endfor
 .for i in ${PHDRS}
 INCSLINKS+=	sys/$i ${INCLUDEDIR}/$i
 .endfor
 
 .if ${MACHINE} != ${MACHINE_CPUARCH}
 _MARCHS=	${MACHINE_CPUARCH}
 .endif
 .if ${MACHINE_CPUARCH} == "i386" || ${MACHINE_CPUARCH} == "amd64"
 _MARCHS+=	x86
 .endif
 
 META_TARGETS+=	compat
 stage_includes: ${SHARED}
 SDESTDIR=	${SYSROOT:U${DESTDIR}}
 
 # Take care of stale directory-level symlinks.
 # Note: The "|| true" after find is needed in case one of the directories does
 # not exist (yet).
 compat:
 	cd ${SDESTDIR}${INCLUDEDIR}; find ${LDIRS} ${LSUBDIRS} machine ${_MARCHS} \
 	    crypto -maxdepth 0 -mindepth 0 -type l -print -delete || true
 	mtree -deU ${NO_ROOT:D-W} ${MTREE_FOLLOWS_SYMLINKS} \
 	    -f ${SRCTOP}/etc/mtree/BSD.include.dist \
 	    -p ${SDESTDIR}${INCLUDEDIR} > /dev/null
 
 copies: .PHONY .META
 	cd ${SDESTDIR}${INCLUDEDIR}; find ${LDIRS} ${LSUBDIRS} ${LSUBSUBDIRS} crypto \
 	    machine machine/pc ${_MARCHS} -maxdepth 1 -mindepth 1 -type l \
 	    -name "*.h" -print -delete || true
 .for i in ${LDIRS} ${LSUBDIRS:Ndev/agp:Ndev/acpica:Ndev/evdev:Ndev/hid:Ndev/hyperv:Ndev/pci:Ndev/veriexec} ${LSUBSUBDIRS}
 	cd ${SRCTOP}/sys; \
 	${INSTALL} -C ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 444 $i/*.h \
 	    ${SDESTDIR}${INCLUDEDIR}/$i
 .endfor
 	cd ${SRCTOP}/sys/${MACHINE}/include; \
 	${INSTALL} -C ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 444 *.h \
 	    ${SDESTDIR}${INCLUDEDIR}/machine
 .if exists(${SRCTOP}/sys/${MACHINE}/include/pc)
 	cd ${SRCTOP}/sys/${MACHINE}/include/pc; \
 	${INSTALL} -C ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 444 *.h \
 	    ${SDESTDIR}${INCLUDEDIR}/machine/pc
 .endif
 .for _MARCH in ${_MARCHS}
 .if exists(${SRCTOP}/sys/${_MARCH}/include)
 	${INSTALL} -d ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 755 \
 	    ${SDESTDIR}${INCLUDEDIR}/${_MARCH}; \
 	cd ${SRCTOP}/sys/${_MARCH}/include; \
 	${INSTALL} -C ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 444 *.h \
 	    ${SDESTDIR}${INCLUDEDIR}/${_MARCH}
 .if exists(${SRCTOP}/sys/${_MARCH}/include/pc)
 	${INSTALL} -d ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 755 \
 	    ${SDESTDIR}${INCLUDEDIR}/${_MARCH}/pc; \
 	cd ${SRCTOP}/sys/${_MARCH}/include/pc; \
 	${INSTALL} -C ${TAG_ARGS} -o ${BINOWN} -g ${BINGRP} -m 444 *.h \
 	    ${SDESTDIR}${INCLUDEDIR}/${_MARCH}/pc
 .endif
 .endif
 .endfor
 
 symlinks: .PHONY .META
 	@${ECHO} "Setting up symlinks to kernel source tree..."
 .for i in ${LDIRS}
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../%s ' sys/$i/*.h) ${SDESTDIR}${INCLUDEDIR}/$i
 .endfor
 .for i in ${LSUBDIRS:Ndev/agp:Ndev/acpica:Ndev/evdev:Ndev/hid:Ndev/hyperv:Ndev/pci:Ndev/veriexec}
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../../%s ' sys/$i/*.h) ${SDESTDIR}${INCLUDEDIR}/$i
 .endfor
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../../sys/dev/acpica/%s ' acpiio.h acpi_hpet.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/dev/acpica; \
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} ../../../../sys/dev/agp/agpreg.h \
 	    ${SDESTDIR}${INCLUDEDIR}/dev/agp; \
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../../sys/dev/evdev/%s ' input.h input-event-codes.h uinput.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/dev/evdev;
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../../sys/dev/hid/%s ' hid.h hidraw.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/dev/hid; \
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} ../../../../sys/dev/hyperv/include/hyperv.h \
 	    ${SDESTDIR}${INCLUDEDIR}/dev/hyperv; \
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} ../../../../sys/dev/hyperv/utilities/hv_snapshot.h \
 	    ${SDESTDIR}${INCLUDEDIR}/dev/hyperv; \
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} ../../../../sys/dev/pci/pcireg.h \
 	    ${SDESTDIR}${INCLUDEDIR}/dev/pci; \
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} ../../../../sys/dev/veriexec/veriexec_ioctl.h \
 	    ${SDESTDIR}${INCLUDEDIR}/dev/veriexec;
 .for i in ${LSUBSUBDIRS}
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../../../%s ' sys/$i/*.h) ${SDESTDIR}${INCLUDEDIR}/$i
 .endfor
 .if ${MK_IPFILTER} != "no"
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../%s ' sys/contrib/ipfilter/netinet/*.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/netinet;
 .endif
 .if ${MK_PF} != "no"
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../../%s ' sys/netpfil/pf/*.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/netpfil/pf;
 .endif
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} ../../../sys/opencrypto/cryptodev.h \
 	    ${SDESTDIR}${INCLUDEDIR}/crypto; \
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../%s ' sys/${MACHINE}/include/*.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/machine;
 .if exists(${SRCTOP}/sys/${MACHINE}/include/pc)
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../../%s ' sys/${MACHINE}/include/pc/*.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/machine/pc;
 .endif
 .for _MARCH in ${_MARCHS}
 .if exists(${SRCTOP}/sys/${_MARCH}/include)
 	${INSTALL} -d ${TAG_ARGS:D${TAG_ARGS},dev} -o ${BINOWN} -g ${BINGRP} -m 755 \
 	    ${SDESTDIR}${INCLUDEDIR}/${_MARCH}; \
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../%s ' sys/${_MARCH}/include/*.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/${_MARCH};
 .if exists(${SRCTOP}/sys/${_MARCH}/include/pc)
 	${INSTALL} -d ${TAG_ARGS:D${TAG_ARGS},dev} -o ${BINOWN} -g ${BINGRP} -m 755 \
 	    ${SDESTDIR}${INCLUDEDIR}/${_MARCH}/pc; \
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../../%s ' sys/${_MARCH}/include/pc/*.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/${_MARCH}/pc;
 .endif
 .endif
 .endfor
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../../%s ' sys/fs/cd9660/*.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/isofs/cd9660; \
 	cd ${SRCTOP}; ${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    $$(printf '../../../sys/rpc/%s ' rpcsec_tls.h types.h) \
 	    ${SDESTDIR}${INCLUDEDIR}/rpc;
 	cd ${SRCTOP}/sys/rpc;
 .if ${MK_CDDL} != "no"
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} \
 	    ../../../sys/contrib/openzfs/include/sys/nvpair.h \
 	    ${SDESTDIR}${INCLUDEDIR}/sys
 .endif
 .if ${MK_MLX5TOOL} != "no"
 	${INSTALL_SYMLINK} ${TAG_ARGS:D${TAG_ARGS},dev} ../../../../sys/dev/mlx5/mlx5io.h \
 	    ${SDESTDIR}${INCLUDEDIR}/dev/mlx5
 .endif
 
 .include <bsd.prog.mk>
 
 installincludes: ${SHARED}
 ${SHARED}: compat
 
 .if ${MACHINE} == "host" && !defined(_SKIP_BUILD)
 # we're here because we are building a sysroot...
 # we need MACHINE et al set correctly
 HOST_MACHINE!= uname -m
 HOST_MACHINE_ARCH!= uname -p
 MACHINE:= ${HOST_MACHINE}
 MACHINE_ARCH:= ${HOST_MACHINE_ARCH}
 .endif
diff --git a/include/sched.h b/include/sched.h
new file mode 100644
index 000000000000..1a8eac18109c
--- /dev/null
+++ b/include/sched.h
@@ -0,0 +1,46 @@
+/*-
+ * Copyright (c) 2021 The FreeBSD Foundation
+ *
+ * This software were developed by Konstantin Belousov <kib@FreeBSD.org>
+ * under sponsorship from the FreeBSD Foundation.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef __SCHED_H__
+#define __SCHED_H__
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+#include <sys/sched.h>
+#if __BSD_VISIBLE
+#include <sys/cpuset.h>
+#endif /* __BSD_VISIBLE */
+
+#if __BSD_VISIBLE
+#ifdef _WITH_CPU_SET_T
+struct _cpuset;
+typedef struct _cpuset cpu_set_t;
+#endif /* _WITH_CPU_SET_T */
+#endif /* __BSD_VISIBLE */
+
+#endif	/* __SCHED_H__ */