jhb 5dd26e948d The current POSIX semaphore implementation stores the _has_waiters flag ... in a separate word from the _count. This does not permit both items to be updated atomically in a portable manner. As a result, sem_post() must always perform a system call to safely clear _has_waiters. This change removes the _has_waiters field and instead uses the high bit of _count as the _has_waiters flag. A new umtx object type (_usem2) and two new umtx operations are added (SEM_WAIT2 and SEM_WAKE2) to implement these semantics. The older operations are still supported under the COMPAT_FREEBSD9/10 options. The POSIX semaphore API in libc has been updated to use the new implementation. Note that the new implementation is not compatible with the previous implementation. However, this only affects static binaries (which cannot be helped by symbol versioning). Binaries using a dynamic libc will continue to work fine. SEM_MAGIC has been bumped so that mismatched binaries will error rather than corrupting a shared semaphore. In addition, a padding field has been added to sem_t so that it remains the same size. Differential Revision: https://reviews.freebsd.org/D961 Reported by: adrian Reviewed by: kib, jilles (earlier version) Sponsored by: Norse		2014-10-24 20:02:44 +00:00
..
bus_if.m	Add a bus method to fetch the VM domain for the given device/bus.	2014-10-09 05:33:25 +00:00
capabilities.conf	Allow sigwait(2) in capabilities mode.	2014-01-28 01:49:49 +00:00
clock_if.m
cpufreq_if.m
device_if.m
genassym.sh
imgact_aout.c
imgact_binmisc.c	Allow multiple image activators to run on the same execution by changing	2014-09-04 21:31:25 +00:00
imgact_elf32.c
imgact_elf64.c
imgact_elf.c	Fixes for i/o during coredumping:	2014-10-04 18:35:00 +00:00
imgact_gzip.c	Add a mmap flag (MAP_32BIT) on 64-bit platforms to request that a mapping use	2013-09-09 18:11:59 +00:00
imgact_shell.c	Allow multiple image activators to run on the same execution by changing	2014-09-04 21:31:25 +00:00
inflate.c
init_main.c	Follow up to r225617. In order to maximize the re-usability of kernel code	2014-10-16 18:04:43 +00:00
init_sysent.c	Regenerate after r272823:	2014-10-09 15:19:35 +00:00
kern_acct.c	acct: create a special plimit object and set it for exiting processes	2013-06-30 19:08:06 +00:00
kern_alq.c	Prevent alq from panic when the invalid alq_file path specified.	2014-04-05 16:54:47 +00:00
kern_clock.c	dtrace sdt: remove the ugly sname parameter of SDT_PROBE_DEFINE	2013-11-26 08:46:27 +00:00
kern_clocksource.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
kern_condvar.c	Fix lc_lock/lc_unlock() support for rmlocks held in shared mode. With	2013-09-20 23:06:21 +00:00
kern_conf.c	Remove global device lock acquisition from dev_relthread(), replacing it	2013-10-22 10:40:26 +00:00
kern_cons.c	Convert from timeout(9) to callout(9).	2014-09-22 14:27:26 +00:00
kern_context.c
kern_cpu.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
kern_cpuset.c	Fix multiple incorrect SYSCTL arguments in the kernel:	2014-10-21 07:31:21 +00:00
kern_ctf.c
kern_descrip.c	filedesc assert that table size is at least 3 in fdsetugidsafety	2014-10-22 08:56:57 +00:00
kern_dtrace.c	Commit the rest of the changes that were intended to be part of r266826.	2014-05-29 01:42:22 +00:00
kern_environment.c	Test if 'env' is NULL before doing memset() and strlen(),	2014-10-23 18:23:50 +00:00
kern_et.c	Fix build breakage. Apparently all ARM configs build kern_et.c, but only a	2014-04-02 17:34:17 +00:00
kern_event.c	Make kevent(2) periodic timer events more reliably periodic. The event	2014-10-04 15:59:15 +00:00
kern_exec.c	filedesc: cleanup setugidsafety a little	2014-10-22 00:23:43 +00:00
kern_exit.c	Avoid unnecessary ppeers_lock acquisition in exit1.	2014-10-05 07:21:41 +00:00
kern_fail.c
kern_ffclock.c
kern_fork.c	Make fdunshare accept only td parameter.	2014-06-28 05:41:53 +00:00
kern_gzio.c
kern_hhook.c	Move hhook's per-vnet initialisation to an earlier SYSINIT SI_SUB stage to	2013-06-15 10:08:34 +00:00
kern_idle.c
kern_intr.c	Convert a missed u_char cpu -> int cpu.	2014-10-19 04:38:02 +00:00
kern_jail.c	Avoid unlocking unlocked mutex in RCTL jail code. Specific test case	2014-09-09 16:05:33 +00:00
kern_khelp.c	Cleanup and simplification in khelp_{register|deregister}_helper(). No	2013-06-15 06:45:17 +00:00
kern_kthread.c	Do not use potentially stale thread in kthread_add()	2013-08-17 17:02:43 +00:00
kern_ktr.c	Drop KTR records when we're in the debugger so that the debugger isn't	2014-07-02 22:13:07 +00:00
kern_ktrace.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
kern_linker.c	Take the lock shared in linker_search_symbol_name.	2014-10-21 21:29:20 +00:00
kern_lock.c	Add function and wrapper to switch lockmgr and vnode lock back to	2014-08-29 09:02:01 +00:00
kern_lockf.c	Correct the problem reported by test16 from	2014-07-08 08:10:15 +00:00
kern_lockstat.c	- For kernel compiled only with KDTRACE_HOOKS and not any lock debugging	2013-11-25 07:38:45 +00:00
kern_loginclass.c	Initialize loginclass mutex using MTX_SYSINIT instead of using SI_SUB_CPU.	2014-05-14 09:03:02 +00:00
kern_malloc.c	svn revisions r269964 and r269963 seemed to have impaired small memory	2014-09-22 05:07:22 +00:00
kern_mbuf.c	Test for absence of M_NOFREE before attempting to purge the mbuf's tags.	2014-09-30 23:16:26 +00:00
kern_mib.c	Fix multiple incorrect SYSCTL arguments in the kernel:	2014-10-21 07:31:21 +00:00
kern_module.c
kern_mtxpool.c	Garbage collect mtxpool_lockbuilder, the mutex pool historically used	2014-05-02 07:57:40 +00:00
kern_mutex.c	- For kernel compiled only with KDTRACE_HOOKS and not any lock debugging	2013-11-25 07:38:45 +00:00
kern_ntptime.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
kern_osd.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
kern_physio.c	Fix some issues in change 254760 pointed out by Bruce Evans:	2013-08-29 16:41:40 +00:00
kern_pmc.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
kern_poll.c	- Remove empty wrappers ether_poll_[de]register_drv(). [1]	2014-09-28 14:05:18 +00:00
kern_priv.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
kern_proc.c	Update the ULE scheduler + thread and kinfo structs to use int for cpuid	2014-10-18 19:36:11 +00:00
kern_prot.c	Eliminate unnecessary memory allocation in sys_getgroups and its ibcs2 counterpart.	2014-10-21 23:08:46 +00:00
kern_racct.c	Convert racct stubs to inline functions.	2014-10-06 02:31:33 +00:00
kern_rangelock.c	Change the queue of locks in kern_rangelock.c from holding lock requests in	2013-08-15 20:19:17 +00:00
kern_rctl.c
kern_resource.c	rlimit: avoid unnecessary copying of rlimits	2013-12-13 20:54:45 +00:00
kern_rmlock.c	- For kernel compiled only with KDTRACE_HOOKS and not any lock debugging	2013-11-25 07:38:45 +00:00
kern_rwlock.c	Drop the 3rd clause from all 3 clause BSD licenses where I am the sole	2014-02-05 18:13:27 +00:00
kern_sdt.c	Print a backtrace if the SDT(9) stub gets called so that there's at least	2014-02-22 01:41:45 +00:00
kern_sema.c
kern_sharedpage.c	Remove the deprecated VM_ALLOC_RETRY flag for the vm_page_grab(9).	2013-08-22 07:39:53 +00:00
kern_shutdown.c	Add error return to dumpsys(), and use it in doadump().	2014-07-25 23:52:53 +00:00
kern_sig.c	Fixes for i/o during coredumping:	2014-10-04 18:35:00 +00:00
kern_switch.c
kern_sx.c	- For kernel compiled only with KDTRACE_HOOKS and not any lock debugging	2013-11-25 07:38:45 +00:00
kern_synch.c	Fix multiple incorrect SYSCTL arguments in the kernel:	2014-10-21 07:31:21 +00:00
kern_syscalls.c
kern_sysctl.c	In all cases except CTLTYPE_STRING, penv is NULL here, so passing it	2014-10-23 22:42:56 +00:00
kern_tc.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
kern_thr.c
kern_thread.c	Style.	2014-09-03 08:40:16 +00:00
kern_time.c	Split up sys_ktimer_getoverrun() into a sys_ and a kern_ variant	2014-08-07 16:49:50 +00:00
kern_timeout.c	Add schedgraph traces for callout handlers. Specifically, a callwheel logs	2014-10-08 16:22:59 +00:00
kern_umtx.c	The current POSIX semaphore implementation stores the _has_waiters flag	2014-10-24 20:02:44 +00:00
kern_uuid.c	Fix a bug in be_uuid_dec(); it called le16dec() instead of be16dec(),	2014-02-13 22:24:36 +00:00
kern_xxx.c
ksched.c
link_elf_obj.c	Fully support constructors for the purpose of code coverage analysis.	2014-10-20 17:04:03 +00:00
link_elf.c	Fully support constructors for the purpose of code coverage analysis.	2014-10-20 17:04:03 +00:00
linker_if.m
Make.tags.inc	Remove AppleTalk support.	2014-03-14 06:29:43 +00:00
Makefile
makesyscalls.sh	Fix syscalls that can be loaded as kernel modules - they were not given	2013-12-15 23:19:42 +00:00
md4c.c
md5c.c
p1003_1b.c
posix4_mib.c
sched_4bsd.c	Restore pre-r239157 handling of sched_yield(), when thread time slice was	2014-08-23 17:31:56 +00:00
sched_ule.c	Update the ULE scheduler + thread and kinfo structs to use int for cpuid	2014-10-18 19:36:11 +00:00
serdev_if.m
stack_protector.c
subr_acl_nfs4.c
subr_acl_posix1e.c
subr_autoconf.c
subr_blist.c
subr_bufring.c
subr_bus_dma.c	Add bus_dmamap_load_ma() function to load map with the array of	2013-10-27 21:39:16 +00:00
subr_bus.c	Add a bus method to fetch the VM domain for the given device/bus.	2014-10-09 05:33:25 +00:00
subr_busdma_bufalloc.c	Replace kernel virtual address space allocation with vmem. This provides	2013-08-07 06:21:20 +00:00
subr_capability.c	Remove duplicated includes.	2014-06-26 13:57:44 +00:00
subr_clock.c	Fix a 2038 bug.	2014-05-01 22:28:14 +00:00
subr_counter.c	Create two public UMA_ZONE_PCPU zones: 64 bit sized and pointer sized.	2014-02-10 19:59:46 +00:00
subr_devstat.c	Fix multiple incorrect SYSCTL arguments in the kernel:	2014-10-21 07:31:21 +00:00
subr_disk.c
subr_dummy_vdso_tc.c
subr_eventhandler.c
subr_fattime.c	Fix a comment typo; conversion tables are for leap years, not leap seconds.	2014-04-20 13:37:22 +00:00
subr_firmware.c
subr_hash.c
subr_hints.c	Follow up to r225617. In order to maximize the re-usability of kernel code	2014-10-16 18:04:43 +00:00
subr_kdb.c	Fix multiple incorrect SYSCTL arguments in the kernel:	2014-10-21 07:31:21 +00:00
subr_kobj.c
subr_lock.c	Drop the 3rd clause from all 3 clause BSD licenses where I am the sole	2014-02-05 18:13:27 +00:00
subr_log.c	MFcalloutng (r244255 by mav, with minor changes):	2013-03-04 16:07:55 +00:00
subr_mbpool.c	All mbuf external free functions never fail, so let them be void.	2014-07-11 13:58:48 +00:00
subr_mchain.c
subr_module.c
subr_msgbuf.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
subr_param.c	Follow up to r225617. In order to maximize the re-usability of kernel code	2014-10-16 18:04:43 +00:00
subr_pcpu.c	Create two public UMA_ZONE_PCPU zones: 64 bit sized and pointer sized.	2014-02-10 19:59:46 +00:00
subr_pctrie.c	- Add a new general purpose path-compressed radix trie which can be used	2013-05-12 04:05:01 +00:00
subr_power.c
subr_prf.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
subr_prof.c	Fully support constructors for the purpose of code coverage analysis.	2014-10-20 17:04:03 +00:00
subr_rman.c	Nuke the never-used RF_TIMESHARE feature, reducing the complexity of the	2014-07-16 22:18:19 +00:00
subr_rtc.c
subr_sbuf.c	Unbreak the ABI by reverting r268494 until the compat shims are provided	2014-07-28 07:20:22 +00:00
subr_scanf.c
subr_sfbuf.c	Move KASSERT into locked region.	2014-08-11 15:06:07 +00:00
subr_sglist.c	Add sglist_append_bio(9) to append a struct bio's data to a sglist	2014-01-13 04:41:08 +00:00
subr_sleepqueue.c	sysctl subsystem uses sxlocks so avoid to setup dynamic sysctl nodes	2014-06-24 15:16:55 +00:00
subr_smp.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
subr_stack.c
subr_syscall.c	Update kernel inclusions of capability.h to use capsicum.h instead; some	2014-03-16 10:55:57 +00:00
subr_taskqueue.c	Temporary revert r269661, it looks like the patch isn't complete.	2014-08-07 14:32:28 +00:00
subr_terminal.c	vt(4): Add cngrab() and cnungrab() callbacks	2014-08-27 10:04:10 +00:00
subr_trap.c	Fix two issues with /dev/mem access on amd64, both causing kernel page	2014-03-21 14:25:09 +00:00
subr_turnstile.c	dtrace sdt: remove the ugly sname parameter of SDT_PROBE_DEFINE	2013-11-26 08:46:27 +00:00
subr_uio.c	Fix multiple incorrect SYSCTL arguments in the kernel:	2014-10-21 07:31:21 +00:00
subr_unit.c	Move the definition of the struct unrhdr into a separate header file,	2013-08-30 07:37:45 +00:00
subr_vmem.c	Do not set M_BESTFIT if a strategy has already been provided. This	2014-04-16 21:39:43 +00:00
subr_witness.c	Fix a typo from r189544, which replaced unp_global_rwlock with unp_list_lock	2014-10-20 20:21:40 +00:00
sys_capability.c	Prepare fget_unlocked for reading fd table only once.	2014-07-23 19:33:49 +00:00
sys_generic.c	In selfdfree re-evaulate sf_si after takin the lock.	2014-10-23 19:06:08 +00:00
sys_pipe.c	Add a new fo_fill_kinfo fileops method to add type-specific information to	2014-09-22 16:20:47 +00:00
sys_procdesc.c	Add a new fo_fill_kinfo fileops method to add type-specific information to	2014-09-22 16:20:47 +00:00
sys_process.c	Plug unnecessary PRS_NEW check in kern_procctl.	2014-10-22 04:16:09 +00:00
sys_socket.c	Add a new fo_fill_kinfo fileops method to add type-specific information to	2014-09-22 16:20:47 +00:00
syscalls.c	Regenerate after r272823:	2014-10-09 15:19:35 +00:00
syscalls.master	Move the SCTP syscalls to netinet with the rest of the SCTP code. The	2014-10-09 15:16:52 +00:00
systrace_args.c	Regen per r263318.	2014-03-18 21:34:11 +00:00
sysv_ipc.c
sysv_msg.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
sysv_sem.c	Pull in r267961 and r267973 again. Fix for issues reported will follow.	2014-06-28 03:56:17 +00:00
sysv_shm.c	Automatically prefault a limited number of mappings to resident pages in	2014-08-31 17:38:41 +00:00
tty_compat.c
tty_info.c
tty_inq.c
tty_outq.c
tty_pts.c	Implement FIODTYPE for master ptys.	2014-10-15 12:38:26 +00:00
tty_tty.c
tty_ttydisc.c
tty.c	Fix draining in ttydev_leave():	2014-10-09 02:30:38 +00:00
uipc_accf.c	The accept filter code is not specific to the FreeBSD IPv4 network stack,	2014-07-26 19:27:34 +00:00
uipc_debug.c	Fix socket buffer timeouts precision using the new sbintime_t KPI instead	2013-09-01 23:34:53 +00:00
uipc_domain.c	- Implement two new system calls:	2013-03-02 21:11:30 +00:00
uipc_mbuf2.c
uipc_mbuf.c	Change a very strange code in m_demote() to simple assertion.	2014-09-04 19:27:30 +00:00
uipc_mqueue.c	Add a new fo_fill_kinfo fileops method to add type-specific information to	2014-09-22 16:20:47 +00:00
uipc_sem.c	Add a new fo_fill_kinfo fileops method to add type-specific information to	2014-09-22 16:20:47 +00:00
uipc_shm.c	Add a new fo_fill_kinfo fileops method to add type-specific information to	2014-09-22 16:20:47 +00:00
uipc_sockbuf.c	Improve transmit sending offload, TSO, algorithm in general.	2014-09-22 08:27:27 +00:00
uipc_socket.c	- Make hhook_run_socket() vnet-aware instead of adding CURVNET_SET() around	2014-09-08 09:04:22 +00:00
uipc_syscalls.c	Move the SCTP syscalls to netinet with the rest of the SCTP code. The	2014-10-09 15:16:52 +00:00
uipc_usrreq.c	Partial revert of r262867.	2014-08-03 22:37:21 +00:00
vfs_acl.c	Update kernel inclusions of capability.h to use capsicum.h instead; some	2014-03-16 10:55:57 +00:00
vfs_aio.c	Update kernel inclusions of capability.h to use capsicum.h instead; some	2014-03-16 10:55:57 +00:00
vfs_bio.c	Remove setting BIO_DONE flag for BIOs that have done() method.	2014-10-15 18:36:34 +00:00
vfs_cache.c	Fix multiple incorrect SYSCTL arguments in the kernel:	2014-10-21 07:31:21 +00:00
vfs_cluster.c	When allocating a pbuf for the cluster write, do not sleep waiting	2013-08-27 01:31:12 +00:00
vfs_default.c	Remove unused arguments for VOP_GETPAGES(), VOP_PUTPAGES().	2014-09-10 12:36:41 +00:00
vfs_export.c	MFC	2013-02-21 21:59:35 +00:00
vfs_extattr.c	Update kernel inclusions of capability.h to use capsicum.h instead; some	2014-03-16 10:55:57 +00:00
vfs_hash.c
vfs_init.c	Rename sysctl_lock and _unlock to sysctl_xlock and _xunlock.	2014-10-21 19:02:26 +00:00
vfs_lookup.c	Plug a memory leak in case of failed lookups in capability mode.	2014-08-24 12:51:12 +00:00
vfs_mount.c	Bring in the new automounter, similar to what's provided in most other	2014-08-17 09:44:42 +00:00
vfs_mountroot.c	Follow up to r225617. In order to maximize the re-usability of kernel code	2014-10-16 18:04:43 +00:00
vfs_subr.c	Don't take devmtx unnecessarily in vn_isdisk.	2014-10-15 05:17:36 +00:00
vfs_syscalls.c	Reduce nesting in vn_access.	2014-10-22 01:53:00 +00:00
vfs_vnops.c	Provide vfs suspension support only for filesystems which need it, take	2014-10-20 18:00:50 +00:00
vnode_if.src	Remove unused arguments for VOP_GETPAGES(), VOP_PUTPAGES().	2014-09-10 12:36:41 +00:00