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_atomic64e.h
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_atomic_subword.h
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_bitset.h
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_blockcount.h
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_bus_dma.h
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_callout.h
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_cpuset.h
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_cscan_atomic.h
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_cscan_bus.h
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_domainset.h
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_eventhandler.h
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_ffcounter.h
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_iovec.h
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_lock.h
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_lockmgr.h
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_mutex.h
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_null.h
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_pctrie.h
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_pthreadtypes.h
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_rangeset.h
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_rmlock.h
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_rwlock.h
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_semaphore.h
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_seqc.h
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_sigset.h
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_smr.h
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_sockaddr_storage.h
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_stack.h
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_stdarg.h
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_stdint.h
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_sx.h
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_task.h
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_termios.h
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_timespec.h
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_timeval.h
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_types.h
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_ucontext.h
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_uio.h
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_umtx.h
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_unrhdr.h
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_winsize.h
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aac_ioctl.h
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abi_compat.h
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acct.h
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acl.h
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agpio.h
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aio.h
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alq.h
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apm.h
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arb.h
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assym.h
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ata.h
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atomic_common.h
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auxv.h
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backlight.h
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bio.h
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bitset.h
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bitstring.h
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blist.h
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blockcount.h
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boot.h
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buf.h
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buf_ring.h
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bufobj.h
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bus.h
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bus_dma.h
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bus_dma_internal.h
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busdma_bufalloc.h
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callout.h
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caprights.h
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capsicum.h
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cdefs.h
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cdio.h
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cdrio.h
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cfictl.h
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chio.h
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ck.h
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clock.h
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cnv.h
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compressor.h
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condvar.h
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conf.h
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cons.h
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consio.h
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copyright.h
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counter.h
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coverage.h
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cpu.h
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cpuctl.h
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cpuset.h
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csan.h
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ctype.h
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devctl.h
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devicestat.h
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devmap.h
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dirent.h
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disk
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disk.h
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disk_zone.h
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disklabel.h
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diskmbr.h
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dkstat.h
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dnv.h
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domain.h
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domainset.h
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dtrace_bsd.h
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dvdio.h
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efi.h
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efiio.h
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elf.h
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elf32.h
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elf64.h
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elf_common.h
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elf_generic.h
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endian.h
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epoch.h
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errno.h
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eui64.h
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event.h
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eventfd.h
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eventhandler.h
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eventvar.h
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exec.h
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extattr.h
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fail.h
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fbio.h
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fcntl.h
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fdcio.h
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file.h
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filedesc.h
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filio.h
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firmware.h
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fnv_hash.h
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font.h
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gmon.h
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gpio.h
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gpt.h
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gsb_crc32.h
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gtaskqueue.h
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hash.h
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hhook.h
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iconv.h
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imgact.h
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imgact_aout.h
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imgact_binmisc.h
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imgact_elf.h
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interrupt.h
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intr.h
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ioccom.h
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ioctl.h
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ioctl_compat.h
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iov.h
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iov_schema.h
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ipc.h
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ipmi.h
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jail.h
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joystick.h
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kbio.h
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kcov.h
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kdb.h
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kenv.h
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kern_prefetch.h
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kernel.h
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kerneldump.h
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khelp.h
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kobj.h
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kpilite.h
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ksem.h
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kthread.h
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ktls.h
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ktr.h
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ktr_class.h
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ktrace.h
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libkern.h
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limits.h
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link_aout.h
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link_elf.h
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linker.h
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linker_set.h
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lock.h
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lock_profile.h
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lockf.h
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lockmgr.h
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lockstat.h
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loginclass.h
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mac.h
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malloc.h
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mbuf.h
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mchain.h
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md4.h
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md5.h
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mdioctl.h
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memdesc.h
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memrange.h
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mman.h
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module.h
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module_khelp.h
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mount.h
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mouse.h
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mpt_ioctl.h
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mqueue.h
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msg.h
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msgbuf.h
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mtio.h
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mutex.h
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namei.h
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nlist_aout.h
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nv.h
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osd.h
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param.h
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pciio.h
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pcpu.h
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pctrie.h
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physmem.h
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pidctrl.h
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pipe.h
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pmc.h
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pmckern.h
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pmclog.h
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poll.h
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posix4.h
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power.h
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priority.h
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priv.h
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prng.h
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proc.h
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procctl.h
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procdesc.h
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procfs.h
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protosw.h
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ptio.h
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ptrace.h
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qmath.h
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queue.h
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racct.h
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random.h
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rangelock.h
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rangeset.h
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rctl.h
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reboot.h
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refcount.h
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regression.h
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resource.h
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resourcevar.h
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rman.h
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rmlock.h
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rtprio.h
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runq.h
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rwlock.h
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sbuf.h
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sched.h
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sdt.h
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select.h
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selinfo.h
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sem.h
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sema.h
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seqc.h
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serial.h
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sf_buf.h
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sglist.h
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shm.h
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sigio.h
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signal.h
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signalvar.h
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sleepqueue.h
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slicer.h
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smp.h
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smr.h
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smr_types.h
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snoop.h
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sockbuf.h
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socket.h
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socketvar.h
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sockio.h
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sockopt.h
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soundcard.h
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specialfd.h
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spigenio.h
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stack.h
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stat.h
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stats.h
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statvfs.h
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stdatomic.h
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stddef.h
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stdint.h
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sx.h
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syscall.h
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syscall.mk
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syscallsubr.h
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sysctl.h
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sysent.h
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syslimits.h
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syslog.h
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sysproto.h
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systm.h
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taskqueue.h
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terminal.h
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termios.h
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thr.h
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tiio.h
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tim_filter.h
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time.h
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timeb.h
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timeet.h
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timeffc.h
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timepps.h
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timers.h
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times.h
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timespec.h
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timetc.h
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timex.h
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tree.h
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tslog.h
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tty.h
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ttycom.h
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ttydefaults.h
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ttydevsw.h
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ttydisc.h
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ttyhook.h
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ttyqueue.h
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turnstile.h
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types.h
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ucontext.h
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ucred.h
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uio.h
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umtx.h
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un.h
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unistd.h
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unpcb.h
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user.h
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utsname.h
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uuid.h
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vdso.h
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vmem.h
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vmmeter.h
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vnode.h
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vtoc.h
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wait.h
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watchdog.h
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Editing: sx.h
/*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2007 Attilio Rao <attilio@freebsd.org> * Copyright (c) 2001 Jason Evans <jasone@freebsd.org> * All rights reserved. * * 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(s), this list of conditions and the following disclaimer as * the first lines of this file unmodified other than the possible * addition of one or more copyright notices. * 2. Redistributions in binary form must reproduce the above copyright * notice(s), 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 COPYRIGHT HOLDER(S) ``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 COPYRIGHT HOLDER(S) 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. * * $FreeBSD$ */ #ifndef _SYS_SX_H_ #define _SYS_SX_H_ #include <sys/_lock.h> #include <sys/_sx.h> #ifdef _KERNEL #include <sys/pcpu.h> #include <sys/lock_profile.h> #include <sys/lockstat.h> #include <machine/atomic.h> #endif /* * In general, the sx locks and rwlocks use very similar algorithms. * The main difference in the implementations is how threads are * blocked when a lock is unavailable. For this, sx locks use sleep * queues which do not support priority propagation, and rwlocks use * turnstiles which do. * * The sx_lock field consists of several fields. The low bit * indicates if the lock is locked with a shared or exclusive lock. A * value of 0 indicates an exclusive lock, and a value of 1 indicates * a shared lock. Bit 1 is a boolean indicating if there are any * threads waiting for a shared lock. Bit 2 is a boolean indicating * if there are any threads waiting for an exclusive lock. Bit 3 is a * boolean indicating if an exclusive lock is recursively held. The * rest of the variable's definition is dependent on the value of the * first bit. For an exclusive lock, it is a pointer to the thread * holding the lock, similar to the mtx_lock field of mutexes. For * shared locks, it is a count of read locks that are held. * * When the lock is not locked by any thread, it is encoded as a * shared lock with zero waiters. */ #define SX_LOCK_SHARED 0x01 #define SX_LOCK_SHARED_WAITERS 0x02 #define SX_LOCK_EXCLUSIVE_WAITERS 0x04 #define SX_LOCK_WRITE_SPINNER 0x08 #define SX_LOCK_RECURSED 0x10 #define SX_LOCK_FLAGMASK \ (SX_LOCK_SHARED | SX_LOCK_SHARED_WAITERS | \ SX_LOCK_EXCLUSIVE_WAITERS | SX_LOCK_RECURSED | SX_LOCK_WRITE_SPINNER) #define SX_LOCK_WAITERS (SX_LOCK_SHARED_WAITERS | SX_LOCK_EXCLUSIVE_WAITERS) #define SX_OWNER(x) ((x) & ~SX_LOCK_FLAGMASK) #define SX_SHARERS_SHIFT 5 #define SX_SHARERS(x) (SX_OWNER(x) >> SX_SHARERS_SHIFT) #define SX_SHARERS_LOCK(x) \ ((x) << SX_SHARERS_SHIFT | SX_LOCK_SHARED) #define SX_ONE_SHARER (1 << SX_SHARERS_SHIFT) #define SX_LOCK_UNLOCKED SX_SHARERS_LOCK(0) #define SX_LOCK_DESTROYED \ (SX_LOCK_SHARED_WAITERS | SX_LOCK_EXCLUSIVE_WAITERS) #ifdef _KERNEL #define sx_recurse lock_object.lo_data #define SX_READ_VALUE(sx) ((sx)->sx_lock) #define lv_sx_owner(v) \ ((v & SX_LOCK_SHARED) ? NULL : (struct thread *)SX_OWNER(v)) /* * Function prototipes. Routines that start with an underscore are not part * of the public interface and are wrappered with a macro. */ void sx_sysinit(void *arg); #define sx_init(sx, desc) sx_init_flags((sx), (desc), 0) void sx_init_flags(struct sx *sx, const char *description, int opts); void sx_destroy(struct sx *sx); int sx_try_slock_int(struct sx *sx LOCK_FILE_LINE_ARG_DEF); int sx_try_slock_(struct sx *sx, const char *file, int line); int sx_try_xlock_int(struct sx *sx LOCK_FILE_LINE_ARG_DEF); int sx_try_xlock_(struct sx *sx, const char *file, int line); int sx_try_upgrade_int(struct sx *sx LOCK_FILE_LINE_ARG_DEF); int sx_try_upgrade_(struct sx *sx, const char *file, int line); void sx_downgrade_int(struct sx *sx LOCK_FILE_LINE_ARG_DEF); void sx_downgrade_(struct sx *sx, const char *file, int line); int _sx_slock_int(struct sx *sx, int opts LOCK_FILE_LINE_ARG_DEF); int _sx_slock(struct sx *sx, int opts, const char *file, int line); int _sx_xlock(struct sx *sx, int opts, const char *file, int line); void _sx_sunlock_int(struct sx *sx LOCK_FILE_LINE_ARG_DEF); void _sx_sunlock(struct sx *sx, const char *file, int line); void _sx_xunlock(struct sx *sx, const char *file, int line); int _sx_xlock_hard(struct sx *sx, uintptr_t x, int opts LOCK_FILE_LINE_ARG_DEF); void _sx_xunlock_hard(struct sx *sx, uintptr_t x LOCK_FILE_LINE_ARG_DEF); #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) void _sx_assert(const struct sx *sx, int what, const char *file, int line); #endif #ifdef DDB int sx_chain(struct thread *td, struct thread **ownerp); #endif struct sx_args { struct sx *sa_sx; const char *sa_desc; int sa_flags; }; #define SX_SYSINIT_FLAGS(name, sxa, desc, flags) \ static struct sx_args name##_args = { \ (sxa), \ (desc), \ (flags) \ }; \ SYSINIT(name##_sx_sysinit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \ sx_sysinit, &name##_args); \ SYSUNINIT(name##_sx_sysuninit, SI_SUB_LOCK, SI_ORDER_MIDDLE, \ sx_destroy, (sxa)) #define SX_SYSINIT(name, sxa, desc) SX_SYSINIT_FLAGS(name, sxa, desc, 0) /* * Full lock operations that are suitable to be inlined in non-debug kernels. * If the lock can't be acquired or released trivially then the work is * deferred to 'tougher' functions. */ #if (LOCK_DEBUG == 0) /* Acquire an exclusive lock. */ static __inline int __sx_xlock(struct sx *sx, struct thread *td, int opts, const char *file, int line) { uintptr_t tid = (uintptr_t)td; uintptr_t v = SX_LOCK_UNLOCKED; int error = 0; if (__predict_false(LOCKSTAT_PROFILE_ENABLED(sx__acquire) || !atomic_fcmpset_acq_ptr(&sx->sx_lock, &v, tid))) error = _sx_xlock_hard(sx, v, opts); return (error); } /* Release an exclusive lock. */ static __inline void __sx_xunlock(struct sx *sx, struct thread *td, const char *file, int line) { uintptr_t x = (uintptr_t)td; if (__predict_false(LOCKSTAT_PROFILE_ENABLED(sx__release) || !atomic_fcmpset_rel_ptr(&sx->sx_lock, &x, SX_LOCK_UNLOCKED))) _sx_xunlock_hard(sx, x); } #endif /* * Public interface for lock operations. */ #ifndef LOCK_DEBUG #error "LOCK_DEBUG not defined, include <sys/lock.h> before <sys/sx.h>" #endif #if (LOCK_DEBUG > 0) || defined(SX_NOINLINE) #define sx_xlock_(sx, file, line) \ (void)_sx_xlock((sx), 0, (file), (line)) #define sx_xlock_sig_(sx, file, line) \ _sx_xlock((sx), SX_INTERRUPTIBLE, (file), (line)) #define sx_xunlock_(sx, file, line) \ _sx_xunlock((sx), (file), (line)) #else #define sx_xlock_(sx, file, line) \ (void)__sx_xlock((sx), curthread, 0, (file), (line)) #define sx_xlock_sig_(sx, file, line) \ __sx_xlock((sx), curthread, SX_INTERRUPTIBLE, (file), (line)) #define sx_xunlock_(sx, file, line) \ __sx_xunlock((sx), curthread, (file), (line)) #endif /* LOCK_DEBUG > 0 || SX_NOINLINE */ #if (LOCK_DEBUG > 0) #define sx_slock_(sx, file, line) \ (void)_sx_slock((sx), 0, (file), (line)) #define sx_slock_sig_(sx, file, line) \ _sx_slock((sx), SX_INTERRUPTIBLE, (file) , (line)) #define sx_sunlock_(sx, file, line) \ _sx_sunlock((sx), (file), (line)) #define sx_try_slock(sx) sx_try_slock_((sx), LOCK_FILE, LOCK_LINE) #define sx_try_xlock(sx) sx_try_xlock_((sx), LOCK_FILE, LOCK_LINE) #define sx_try_upgrade(sx) sx_try_upgrade_((sx), LOCK_FILE, LOCK_LINE) #define sx_downgrade(sx) sx_downgrade_((sx), LOCK_FILE, LOCK_LINE) #else #define sx_slock_(sx, file, line) \ (void)_sx_slock_int((sx), 0) #define sx_slock_sig_(sx, file, line) \ _sx_slock_int((sx), SX_INTERRUPTIBLE) #define sx_sunlock_(sx, file, line) \ _sx_sunlock_int((sx)) #define sx_try_slock(sx) sx_try_slock_int((sx)) #define sx_try_xlock(sx) sx_try_xlock_int((sx)) #define sx_try_upgrade(sx) sx_try_upgrade_int((sx)) #define sx_downgrade(sx) sx_downgrade_int((sx)) #endif #ifdef INVARIANTS #define sx_assert_(sx, what, file, line) \ _sx_assert((sx), (what), (file), (line)) #else #define sx_assert_(sx, what, file, line) (void)0 #endif #define sx_xlock(sx) sx_xlock_((sx), LOCK_FILE, LOCK_LINE) #define sx_xlock_sig(sx) sx_xlock_sig_((sx), LOCK_FILE, LOCK_LINE) #define sx_xunlock(sx) sx_xunlock_((sx), LOCK_FILE, LOCK_LINE) #define sx_slock(sx) sx_slock_((sx), LOCK_FILE, LOCK_LINE) #define sx_slock_sig(sx) sx_slock_sig_((sx), LOCK_FILE, LOCK_LINE) #define sx_sunlock(sx) sx_sunlock_((sx), LOCK_FILE, LOCK_LINE) #define sx_assert(sx, what) sx_assert_((sx), (what), __FILE__, __LINE__) /* * Return a pointer to the owning thread if the lock is exclusively * locked. */ #define sx_xholder(sx) \ ((sx)->sx_lock & SX_LOCK_SHARED ? NULL : \ (struct thread *)SX_OWNER((sx)->sx_lock)) #define sx_xlocked(sx) \ (((sx)->sx_lock & ~(SX_LOCK_FLAGMASK & ~SX_LOCK_SHARED)) == \ (uintptr_t)curthread) #define sx_unlock_(sx, file, line) do { \ if (sx_xlocked(sx)) \ sx_xunlock_(sx, file, line); \ else \ sx_sunlock_(sx, file, line); \ } while (0) #define sx_unlock(sx) sx_unlock_((sx), LOCK_FILE, LOCK_LINE) #define sx_sleep(chan, sx, pri, wmesg, timo) \ _sleep((chan), &(sx)->lock_object, (pri), (wmesg), \ tick_sbt * (timo), 0, C_HARDCLOCK) /* * Options passed to sx_init_flags(). */ #define SX_DUPOK 0x01 #define SX_NOPROFILE 0x02 #define SX_NOWITNESS 0x04 #define SX_QUIET 0x08 #define SX_RECURSE 0x20 #define SX_NEW 0x40 /* * Options passed to sx_*lock_hard(). */ #define SX_INTERRUPTIBLE 0x40 #if defined(INVARIANTS) || defined(INVARIANT_SUPPORT) #define SA_LOCKED LA_LOCKED #define SA_SLOCKED LA_SLOCKED #define SA_XLOCKED LA_XLOCKED #define SA_UNLOCKED LA_UNLOCKED #define SA_RECURSED LA_RECURSED #define SA_NOTRECURSED LA_NOTRECURSED /* Backwards compatibility. */ #define SX_LOCKED LA_LOCKED #define SX_SLOCKED LA_SLOCKED #define SX_XLOCKED LA_XLOCKED #define SX_UNLOCKED LA_UNLOCKED #define SX_RECURSED LA_RECURSED #define SX_NOTRECURSED LA_NOTRECURSED #endif #endif /* _KERNEL */ #ifdef _STANDALONE /* since we have no threads in the boot loader, trivially implement no-op version */ #define sx_xlock(s) (1) #define sx_try_xlock(s) (1) #define sx_xunlock(s) (1) #define SX_DUPOK 0 #define SX_NEW 0 #define SX_NOWITNESS 0 static __inline void sx_init_flags(struct sx *sx, const char *description, int opts) { } static __inline void sx_destroy(struct sx *sx) { } #endif /* _STANDALONE */ #endif /* !_SYS_SX_H_ */
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