pthread_join() caller do futex_wait on child_clear_tid. As a results
of multiple simultaneous calls to pthread_join() specifying the same
target thread are undefined wake up the one thread.
Switch linuxulator to use the native 1:1 threads.
The reasons:
1. Get rid of the stubs/quirks with process dethreading,
process reparent when the process group leader exits and close
to this problems on wait(), waitpid(), etc.
2. Reuse our kernel code instead of writing excessive thread
managment routines in Linuxulator.
Implementation details:
1. The thread is created via kern_thr_new() in the clone() call with
the CLONE_THREAD parameter. Thus, everything else is a process.
2. The test that the process has a threads is done via P_HADTHREADS
bit p_flag of struct proc.
3. Per thread emulator state data structure is now located in the
struct thread and freed in the thread_dtor() hook.
Mandatory holdig of the p_mtx required when referencing emuldata
from the other threads.
4. PID mangling has changed. Now Linux pid is the native tid
and Linux tgid is the native pid, with the exception of the first
thread in the process where tid and pid are one and the same.
Ugliness:
In case when the Linux thread is the initial thread in the thread
group thread id is equal to the process id. Glibc depends on this
magic (assert in pthread_getattr_np.c). So for system calls that
take thread id as a parameter we should use the special method
to reference struct thread.
In preparation for switching linuxulator to the use the native 1:1
threads split sys_sched_getparam(), sys_sched_setparam(),
sys_sched_getscheduler(), sys_sched_setscheduler() to their kern_*
counterparts and add targettd parameter to allow specify the target
thread directly by callee.
In preparation for switching linuxulator to the use the native 1:1
threads refactor kern_sched_rr_get_interval() and sys_sched_rr_get_interval().
Add a kern_sched_rr_get_interval() counterpart which takes a targettd
parameter to allow specify target thread directly by callee (new Linuxulator).
Linuxulator temporarily uses first thread in proc.
Move linux_sched_rr_get_interval() to the MI part.
In preparation for switching linuxulator to the use the native 1:1
threads split sys_thr_exit() up into sys_thr_exit() and kern_thr_exit().
Move
Where the second will be used in linux_exit() system call later.
In preparation for switching linuxulator to the use the native 1:1
threads introduce linux_exit() stub instead of sys_exit() call
(which terminates process).
In the new linuxulator exit() system call terminates the calling
thread (not a whole process).
MFC r275121 (by kib). Only merge the syntax changes from r275121,
PROC_*LOCK() macros still lock the same proc spinlock.
The process spin lock currently has the following distinct uses:
- Threads lifetime cycle, in particular, counting of the threads in
the process, and interlocking with process mutex and thread lock.
The main reason of this is that turnstile locks are after thread
locks, so you e.g. cannot unlock blockable mutex (think process
mutex) while owning thread lock.
- Virtual and profiling itimers, since the timers activation is done
from the clock interrupt context. Replace the p_slock by p_itimmtx
and PROC_ITIMLOCK().
- Profiling code (profil(2)), for similar reason. Replace the p_slock
by p_profmtx and PROC_PROFLOCK().
- Resource usage accounting. Need for the spinlock there is subtle,
my understanding is that spinlock blocks context switching for the
current thread, which prevents td_runtime and similar fields from
changing (updates are done at the mi_switch()). Replace the p_slock
by p_statmtx and PROC_STATLOCK().
Discussed with: kib
mps(4) sends StartStopUnit to SATA direct-access devices during shutdown.
Document the tunables which control that behavior.
Approved by: jhb
Sponsored by: Panasas, Inc.
Move fdopen() up near other resource allocation like malloc(); do proper
deallocation on failure later on in the function.
Approved by: jhb
Sponsored by: Panasas, Inc.
in the foreground.
This allows a separate process to monitor when and how syslogd exits. That
process can then restart syslogd if needed.
Approved by: jhb
Sponsored by: Panasas, Inc.
r293173:
Fix path to include .OBJDIR to avoid polluting the source
tree during 'make release'.
r293231:
Add a new target to touch the ${.OBJDIR}/release file, which
indicates the 'release' target has run (in order to prevent
subsequent invocations that may clobber original build output).
Sponsored by: The FreeBSD Foundation
Unset the gss kernel state when gssd exits
When gssd exits it leaves the kernel state set by
gssd_syscall(). nfsd sees this and waits endlessly
in an unkillable state for gssd to come back. If you
had acidentally started gssd then stopped it, then
started nfsd you'd be in a bad way until you either
restarted gssd or rebooted the system. This change
fixes that by setting the kernel state to "" when
gssd exits.
Wrap using #ifdef 'notyet' those variables and statements not yet
implemented to lower the compiler warnings.
It fix the case of unused-but-set-variable spotted by gcc4.9.
Reviewed by: ngie
Approved by: rodrigc (mentor)
Sponsored by: gandi.net
Differential Revision: https://reviews.freebsd.org/D4775
Provide knob NO_INSTALLEXTRAKERNELS. If defined, extra kernels in KERNCONF
won't be installed, only the first one would.
Turn NO_INSTALLEXTRAKERNELS=yes on stable/10 to preserve original
behaviour of not installing additional kernels built.
Reported & tested by: Trond Endrestøl <Trond.Endrestol fagskolen.gjovik.no>
Reported & tested by: dhw
Add NO_INSTALLKERNEL to undo the assumption that the first KERNCONF will be
installed as "kernel". This is relevant for packaging of the kernel when not
wanting a default "kernel.txz".
in6_if2idlen: treat bridge(4) interfaces like other Ethernet interfaces
bridge(4) interfaces have an if_type of IFT_BRIDGE, rather than
IFT_ETHER, even though they only support Ethernet-style links. This
caused in6_if2idlen to emit an "unknown link type (209)" warning to
the console every time it was called. Add IFT_BRIDGE to the case
statement in the appropriate place, indicating that it uses the same
IPv6 address format as other Ethernet-like interfaces.
As these will depend on ficl having been built, and are set via
bsd.arch.inc.mk we need to place this after ficl.
As Makefile.amd64 is now late enough we can add the i386 directory to
this.
It may not be the same as MACHINE_CPUARCH, it just happened to be the
case the architectures this code currently supports.
Fixes build failure reported by Oliver Pinter.
