Commit Graph

566 Commits

Author SHA1 Message Date
David Xu
eb90369fa6 Don't lock scheduler lock twice. 2003-06-18 06:08:03 +00:00
Daniel Eischen
690f13f3c3 After selecting a thread to handle a signal and taking
its scheduling lock, make sure that the thread still has
the signal unmasked.

Make a debug statement conditional on debugging being
enabled.
2003-06-08 17:37:21 +00:00
Daniel Eischen
f91de797ce Insert threads at the end of the free thread list so that
the chance of getting the same thread id when allocating a
new thread is reduced.  This won't work if the application
creates a new thread for every time a thread exits, but
we're still within the allowances of POSIX.
2003-06-08 17:35:11 +00:00
Daniel Eischen
4d6f145a3b Provide a reference to __sys_write. The implementation uses this when
debugging is enabled so the symbol needs to be resolved before rtld
locking is enabled.  I may not really know what I'm talking about,
but it works.

Submitted by:	kan
2003-06-08 17:29:32 +00:00
Philippe Charnier
19677e1070 The .Fn function 2003-06-08 10:40:44 +00:00
Warner Losh
cedfd4f63f Don't force -L/usr/lib. This is incorrect because we should not be
looking at the host environment for anything.  This breaks building
-CURRENT on 4.x as well.

Submitted by: kan@
2003-06-08 03:58:20 +00:00
David Xu
a05fa0abea Only init _thread_sigact once, needn't init it again after a fork().
Obtained from: deischen
2003-06-04 12:40:21 +00:00
David Xu
cd0a0c267b Despite whether threaded mode is turned on, always save thread's
signal mask.
2003-06-04 12:38:21 +00:00
David Xu
e84a8d0d65 KMF_DONE is now in /sys/sys/kse.h, no longer need to define it here. 2003-06-04 03:22:59 +00:00
David Xu
a4c69f224b Free memory of internal low level lock when mutex and condition variable
are destroyed.

Submitted by: tegge
2003-06-03 02:21:01 +00:00
David Xu
9abece6475 Save THR_FLAGS_IN_TDLIST in signal frame, otherwise if a thread received
a signal will can not be removed from thread list after it exited.

Reviewed by: deischen
Approved by: re (jhb)
2003-05-30 14:50:16 +00:00
Alexander Kabaev
84d55c7fad Attempt to eliminate PLT relocations from rwlock aquire/release
path, making them suitable for direct use by the dynamic loader.

Register libpthread-specific locking API with rtld on startup.

This still has some rough edges with signals which should be
addresses later.

Approved by:	re (scottl)
2003-05-30 00:21:52 +00:00
Daniel Eischen
43dd76d242 Call the __sys_sigprocmask(the system call) when sigprocmask()
is called and the application is not threaded.  This works around
a problem when an application that hasn't yet become threaded
tries to jump out of a signal handler.

Reported by:	mbr
Approved by:	re@ (rwatson)
2003-05-30 00:09:22 +00:00
Daniel Eischen
28362a5c80 Don't really spin on a spinlock; silently convert it to the same
low-level lock used by the libpthread implementation.  In the
future, we'll eliminate spinlocks from libc but that will wait
until after 5.1-release.

Don't call an application signal handler if the handler is
the same as the library-installed handler.  This seems to
be possible after a fork and is the cause of konsole hangs.

Approved by:	re@ (jhb)
2003-05-29 17:10:45 +00:00
Ruslan Ermilov
734ac3b543 mdoc(7) fixes.
Approved by:	re (blanket)
2003-05-24 19:53:08 +00:00
Daniel Eischen
1cb570c531 Change low-level locking a bit so that we can tell if
a lock is being waitied on.

Fix a races in join and cancellation.

When trying to wait on a CV and the library is not yet
threaded, make it threaded so that waiting actually works.

When trying to nanosleep() and we're not threaded, just
call the system call nanosleep instead of adding the thread
to the wait queue.

Clean up adding/removing new threads to the "all threads queue",
assigning them unique ids, and tracking how many active threads
there are.  Do it all when the thread is added to the scheduling
queue instead of making pthread_create() know how to do it.

Fix a race where a thread could be marked for signal delivery
but it could be exited before we actually add the signal to it.

Other minor cleanups and bug fixes.

Submitted by:	davidxu
Approved by:	re@ (blanket for libpthread)
2003-05-24 02:29:25 +00:00
Daniel Eischen
28f318b941 Eek, staticize a couple of functions that shouldn't
be external (initialize()!).

Remove cancellation points from _pthread_cond_wait and
_pthread_cond_timedwait (single underscore versions are
libc private functions).  Point the weak reference(!) for
these functions to the versions with cancellation points.

Approved by:	re@(blanket till 5/19)
Pointed out by:	kan (cancellation point bug)
2003-05-19 23:04:50 +00:00
Daniel Eischen
fd626336fd Add a method of yielding the current thread with the scheduler
lock held (_thr_sched_switch_unlocked()) and use this to avoid
dropping the scheduler lock and having the scheduler retake the
same lock again.

Add a better way of detecting if a low-level lock is in use.

When switching out a thread due to blocking in the UTS, don't
switch to the KSE's scheduler stack only to switch back to
another thread.  If possible switch to the new thread directly
from the old thread and avoid the overhead of the extra
context switch.

Check for pending signals on a thread when entering the scheduler
and add them to the threads signal frame.  This includes some
other minor signal fixes.

Most of this was a joint effor between davidxu and myself.

Reviewed by:	davidxu
Approved by:	re@ (blanket for libpthread)
2003-05-16 19:58:30 +00:00
Daniel Eischen
07e6b1c7a3 Make pthread_join() async-cancel-safe. David was going to commit
this, but I think he's asleep and want to be sure it gets in before
the freeze.

Submitted by:	davidxu
2003-05-06 00:02:54 +00:00
David Xu
f508d26091 call dump_queues() only when DEBUG_THREAD_KERN is defined, save some
cpu cycles.
2003-05-05 05:01:19 +00:00
Daniel Eischen
c72cd7c9e2 Protect against a race between granting a lock and accessing
other parts of the lock.

Submitted by:	davidxu
2003-05-04 22:29:09 +00:00
Daniel Eischen
40791d9d15 Fix suspend and resume.
Submitted (in part) by:	Kazuaki Oda <kaakun@highway.ne.jp>
2003-05-04 16:17:01 +00:00
David Xu
99c883294c Handle thread canceled case, it is same as signal caused backout,
but will break out of loop.
2003-05-02 11:39:00 +00:00
Daniel Eischen
d143dde438 Move the mailbox to the beginning of the thread and align the
thread so that the context (SSE FPU state) is also aligned.
2003-04-30 15:05:17 +00:00
David Xu
d1021be03f Call kse_wakeup_mutli() after remove current thread from RUNQ to avoid
doing unnecessary idle kse wakeup.
2003-04-30 01:15:21 +00:00
David Xu
30a2952c90 Call kse_wakeup_multi() to wakeup idle KSEs when there are threads ready
to run.
2003-04-30 01:03:58 +00:00
Daniel Eischen
a8b5a9cd12 Jump to the correct label upon detecting an error. 2003-04-29 21:05:17 +00:00
Daniel Eischen
6cc13fa9ad Create the thread signal lock as a KSE lock (as opposed to
a thread lock).

Better protect access to thread state while searching for
threads to handle a signal.

Better protect access to process pending signals while processing
a thread in sigwait().

Submitted by:	davidxu
2003-04-29 21:03:33 +00:00
Daniel Eischen
55613576f5 o Don't add a scope system thread's KSE to the list of available
KSEs when it's thread exits; allow the GC handler to do that.

o Make spinlock/spinlock critical regions.

The following were submitted by davidxu

  o Alow thr_switch() to take a null mailbox argument.

  o Better protect cancellation checks.

  o Don't set KSE specific data when creating new KSEs; rely on the
    first upcall of the KSE to set it.

  o Add the ability to set the maximum concurrency level and do this
    automatically.  We should have a way to enable/disable this with
    some sort of tunable because some applications may not want this
    to be the default.

  o Hold the scheduling lock across thread switch calls.

  o If scheduling of a thread fails, make sure to remove it from the list
    of active threads.

  o Better protect accesses to a joining threads when the target thread is
    exited and detached.

  o Remove some macro definitions that are now provided by <sys/kse.h>.

  o Don't leave the library in threaded mode if creation of the initial
    KSE fails.

  o Wakeup idle KSEs when there are threads ready to run.

  o Maintain the number of threads active in the priority queue.
2003-04-28 23:56:12 +00:00
Daniel Eischen
76f344139c Use the correct link entry for walking the list of threads.
While I'm here, use the TAILQ_FOREACH macro instead of a more
manual method which was inherited from libc_r (so we could
remove elements from the list which isn't needed for libpthread).

Submitted by:	Kazuaki Oda <kaakun@highway.ne.jp>
2003-04-28 21:35:06 +00:00
Daniel Eischen
fd47bf962d Remove the %gs restoring hack (already commented out).
Don't install man pages.

Temporarily (again) rename the library to libkse.  It will be put back
to libpthread after more wide-spread testing.
2003-04-25 01:31:56 +00:00
Daniel Eischen
10629b6587 Add a macro to get the current thread mailbox pointer. 2003-04-23 21:49:34 +00:00
Daniel Eischen
c159269082 Remove the i386-specific hack (well, we only run on i386 anyways)
to always set %gs when resuming a thread.

Install this library as libpthread instead of libkse.
2003-04-23 21:48:29 +00:00
Daniel Eischen
f1c8192fd4 Protect thread errno from being changed while operating
on behalf of the KSE.

Add a kse_reinit function to reinitialize a reused KSE.

Submitted by:	davidxu
2003-04-23 21:46:50 +00:00
Daniel Eischen
29fde418c1 Set the quantum for scope system threads to 0 (no quantum). 2003-04-22 21:32:32 +00:00
Daniel Eischen
42a5f6248b Add a working pthread_[gs]etconcurrency. Initial null implementation
provided by Sergey A. Osokin <osa@freebsd.org.ru>.

In order to test this on a single CPU machine, you need to:

    sysctl kern.threads.debug=1
    sysctl kern.threads.virtual_cpu=2
2003-04-22 20:29:16 +00:00
Daniel Eischen
6dee371a55 Add a couple asserts to pthread_cond_foo to ensure the (low-level)
lock level is 0.  Thus far, the threads implementation doesn't use
mutexes or condition variables so the lock level should be 0.

Save the return value when trying to schedule a new thread and
use this to return an error from pthread_create().

Change the max sleep time for an idle KSE to 1 minute from 2 minutes.

Maintain a count of the number of KSEs within a KSEG.

With these changes scope system threads seem to work, but heavy
use of them crash the kernel (supposedly VM bugs).
2003-04-22 20:28:33 +00:00
Daniel Eischen
02245e6120 Add an i386-specifc hack to always set %gs. There still seems
to be instances where the kernel doesn't  properly save and/or
restore it.

Use noupcall and nocompleted flags in the KSE mailbox.  These
require kernel changes to work which will be committed sometime
later.  Things still work without the changes.

Remove the general kse entry function and use two different
functions -- one for scope system threads and one for scope
process threads.  The scope system function is not yet enabled
and we use the same function for all threads at the moment.

Keep a copy of the KSE stack for the case that a KSE runs
a scope system thread and uses the same stack as the thread
(no upcalls are generated, so a separate stack isn't needed).
This isn't enabled yet.

Use a separate field for the KSE waiting flag.  It isn't
correct to use the mailbox flags field.

The following fixes were provided by David Xu:

  o Initialize condition variable locks with thread versions
    of the low-level locking functions instead of the kse versions.

  o Enable threading before creating the first thread instead
    of after.

  o Don't enter critical regions when trying to malloc/free
    or call functions that malloc/free.

  o Take the scheduling lock when inheriting thread attributes.

  o Check the attribute's stack pointer instead of the
    attributes stack size for null when allocating a
    thread's stack.

  o Add a kseg reinit function so we don't have to destroy and
    then recreate the same lock.

  o Check the return value of kse_create() and return an
    appropriate error if it fails.

  o Don't forget to destroy a thread's locks when freeing it.

  o Examine the correct flags word for checking to see if
    a thread is in a synchronization queue.

Things should now work on an SMP kernel.
2003-04-21 04:02:56 +00:00
Daniel Eischen
6c2a22923c Use popfl to get the flags off the stack instead of popf.
Submitted by:	davidxu
2003-04-21 03:59:07 +00:00
Daniel Eischen
078d4c1b8b Remove duplicate $FreeBSD$ id. 2003-04-18 07:45:03 +00:00
Daniel Eischen
e4c2ac1637 Sorry folks; I accidentally committed a patch from what I was working
on a couple of days ago.  This should be the most recent changes.

Noticed by:	davidxu
2003-04-18 07:09:43 +00:00
Daniel Eischen
0174b69f92 Comment out the addition of -g to CFLAGS. This snuck in from
my local version.
2003-04-18 05:06:56 +00:00
Daniel Eischen
a0240e2cb0 Revamp libpthread so that it has a chance of working in an SMP
environment.  This includes support for multiple KSEs and KSEGs.

The ability to create more than 1 KSE via pthread_setconcurrency()
is in the works as well as support for PTHREAD_SCOPE_SYSTEM threads.
Those should come shortly.

There are still some known issues which davidxu and I are working
on, but it'll make it easier for us by committing what we have.

This library now passes all of the ACE tests that libc_r passes
with the exception of one.  It also seems to work OK with KDE
including konqueror, kwrite, etc.  I haven't been able to get
mozilla to run due to lack of java plugin, so I'd be interested
to see how it works with that.

Reviewed by:	davidxu
2003-04-18 05:04:16 +00:00
Daniel Eischen
b025fc9a31 Add FIFO queueing locking operations based on atomic swap.
Modify thread errno for the new libpthread changes.

Reviewed by:	davidxu
2003-04-18 05:02:39 +00:00
Daniel Eischen
27f625a036 Add architecture dependent atomic ops (atomic_swap only), KSE specific
data, and userland versions of [gs]etcontext().

Modify the UTS entry and exit functions to account of FPU validity
and format.
2003-04-18 05:00:52 +00:00
Jeff Roberson
cc3521d660 - Define a _spinunlock() function so that threading implementations may do
more complicated things than just setting the lock to 0.
 - Implement stubs for this function in libc and the two threading libraries
   that are currently in the tree.
2003-03-26 04:02:24 +00:00
David Xu
5b54b0891a Backout last commit.
Requested by: jhb
2003-03-15 04:45:42 +00:00
David Xu
047a20e644 Fix a bug in rwlock. When a rwlock was locked by reader threads, a
writter thread can block reader threads to get read lock.
2003-03-14 01:02:47 +00:00
Alexey Zelkin
68d8899c03 Fix cut'n'paste error
Noticed by:	julian
2003-03-05 20:50:03 +00:00
Alexey Zelkin
09492be669 MFlibc_r: add and document pthread_attr_get_np() function. 2003-03-03 22:40:20 +00:00
David Xu
96dfe788ad Fix compiling error. 2003-02-26 08:28:28 +00:00
Jonathan Mini
3b63c6c8ea Insert threads interrupted by a signal while running onto the run queue. 2003-02-23 21:15:25 +00:00
Jonathan Mini
f88cb3c627 Add signal logic to the build. 2003-02-23 21:14:08 +00:00
Jonathan Mini
faa8342f9f Deliver signals posted via an upcall to the appropriate thread. 2003-02-17 10:05:18 +00:00
Alfred Perlstein
969e2ea158 Actually link in the attr_{set,get}stack. 2003-02-11 07:28:28 +00:00
Alfred Perlstein
4e44912c6c Add pthread_attr_getstack() and pthread_attr_setstack().
Submitted by: Craig Rodrigues <rodrigc@attbi.com>
2003-02-10 08:48:04 +00:00
Max Khon
1746ea2b02 remove #ifdef _THREAD_SAFE 2003-01-24 01:46:30 +00:00
Jens Schweikhardt
57bd0fc6e8 english(4) police. 2002-12-27 12:15:40 +00:00
Ruslan Ermilov
facc67676f mdoc(7) police: Deal with self-xrefs. 2002-12-24 13:41:48 +00:00
Daniel Eischen
84001cde8f For now, build and install this as libkse instead of libpthread.
This will avoid any accidental use of an experimental library.

Suggested by:	rwatson
Approved by:	re (jhb)
2002-12-08 22:43:31 +00:00
Jonathan Mini
e9d0431f0b Schedule spinlocked threads by moving them through the work queue, instead
of the wait queue.

Approved by: re (blanket)
Stolen from: davidxu
2002-11-24 06:45:45 +00:00
Jonathan Mini
4df51f23bb Get the wall clock time from the KSE mailbox, rather than doing another
syscall.
2002-11-24 06:43:21 +00:00
David Xu
2442bdd81b Directly load %edx from mailbox 2002-11-23 04:39:52 +00:00
David Xu
4949943c48 In _thread_enter_uts, fix eflags saving bug.
In _thread_switch, set current thread pointer in kse mailbox
only after all registers copied out of thread mailbox, kernel will do
upcall at trap time, if set current thread pointer before loading all
registers from thread mailbox, at trap time, the thread mailbox data
will be overwritten by kernel, result is junk data is loaded into CPU.
2002-11-22 11:43:06 +00:00
David Xu
662c0429b9 Fix idle timeout bug, use correct current time of day. 2002-11-20 12:35:59 +00:00
David Xu
4ab365e720 Adjust code for new mailbox format.
Reviewed by: deischen, mini
2002-11-18 02:02:08 +00:00
Jonathan Mini
1cb53a1828 Schedule an idle context to block until timeouts expire without blocking
further upcalls.
2002-11-12 00:55:01 +00:00
Jonathan Mini
40e044cbd3 Make pthread_sigmask(3) operate on the thread signal mask, not the process
signal mask.
2002-10-30 07:13:27 +00:00
Jonathan Mini
2d9a293b4e Use KSE to schedule threads. 2002-10-30 06:07:18 +00:00
Robert Drehmel
e31d11c36a Add the 'restrict' type qualifier to the prototypes of `sigaction',
`sigprocmask', `sigaltstack', and `sigwait' as well as to the
prototypes of the apparantly unimplemented functions `sigtimedwait'
and `sigwaitinfo'.  This complies with IEEE Std 1003.1-2001.
2002-10-02 10:53:44 +00:00
Peter Wemm
224af215a6 Zap now-unused SHLIB_MINOR 2002-09-28 00:25:32 +00:00
Jonathan Mini
255ab70cdf Make libpthread KSE aware.
Reviewed by:	deischen, julian
Approved by:	-arch
2002-09-16 19:52:52 +00:00
Jonathan Mini
cfa1f4e659 Mechanically change all libc_r references to libpthread. 2002-09-16 19:29:34 +00:00
Jonathan Mini
cc118d869b Make the changes needed for libpthread to compile in its new home.
The new libpthread will provide POSIX threading support using KSE.
These files were previously repo-copied from src/lib/libc_r.

Reviewed by:	deischen
Approved by:	-arch
2002-09-16 08:45:36 +00:00
Daniel Eischen
d8b5986dd6 Remove much of the dereferencing of the fd table entries to look
at file flags and replace it with functions that will avoid null
pointer checks.

MFC to be done by archie ;-)

PR:		42100
Reviewed by:	archie, robert
MFC after:	3 days
2002-08-29 23:06:07 +00:00
Archie Cobbs
afa4625307 Make the libc_r version of select() set the readable or writable
file descriptor bit if poll() returns POLLERR, POLLHUP, or POLLNVAL.
Othewise, it's possible for select() to return successfully but
with no bits set.

Reviewed by:	deischen
MFC after:	3 days
PR:		bin/42175
2002-08-29 21:39:19 +00:00
Archie Cobbs
ccde72a411 When poll(2)'ing for readability or writability of a file descriptor
on behalf of a thread, we should check the POLLERR, POLLHUP, and
POLLNVAL flags as well to wake up the thread in these cases.

Suggested by:	deischen
MFC after:	3 days
2002-08-29 00:44:11 +00:00
Philippe Charnier
7fed38d0a0 Replace various spelling with FALLTHROUGH which is lint()able 2002-08-25 13:10:45 +00:00
Peter Wemm
7657553c76 Add an ia64 atomic lock primitive for libc_r. This is mostly for
completeness and doesn't get us a working libc_r there because libc_r
uses setjmp() and setjmp() cannot be used for context switches on ia64
as-is (or sparc64).  Rather than making setjmp/longjmp behave like
the *context() calls, it would be far better to make libc_r use *context()
directly which is what they are for.

Obtained from:  marcel
2002-07-20 19:22:10 +00:00
Maxim Konovalov
25a6539985 Fix a typo.
MFC after:	3 days
2002-07-10 09:06:42 +00:00
Daniel Eischen
582dfa2dd4 Oops, forgot to set the suspended flag for threads that are created
initially suspended.  This was preventing such threads from getting
resumed.

Reported by:	Bill Huey <billh@gnuppy.monkey.org>
2002-07-09 13:24:52 +00:00
Daniel Eischen
c3d580c9a1 Fix a couple of minor nits that prevented this from compiling.
Pointed out by:	julian
2002-07-02 01:26:16 +00:00
Daniel Eischen
88127f1a62 Make sigpending and sigsuspend account for signals that are pending on
the process as well as pending on the current thread.

Reported by:	Andrew MacIntyre <andymac@bullseye.apana.org.au>
2002-06-28 13:28:41 +00:00
Daniel Eischen
b4e1c937c7 Add a wrapper for pselect() in order to make it a cancellation point.
Prompted by: wollman
2002-06-28 13:26:02 +00:00
Robert Watson
4a85ccbe6d Missed in earlier commit -- I did cvs commit src/lib/libc. Oops. 2002-06-14 04:02:25 +00:00
Daniel Eischen
5eb8d1f0b0 Revamp suspend and resume. While I'm here add pthread_suspend_all_np()
and pthread_resume_all_np().  These suspend and resume all threads except
the current thread, respectively.  The existing functions pthread_single_np()
and pthread_multi_np(), which formerly had no effect, now exhibit the same
behaviour and pthread_suspend_all_np() and pthread_resume_all_np().  These
functions have been added mostly for the native java port.

Don't allow the uthread kernel pipe to use the same descriptors as
stdio.  Mostily submitted by Oswald Buddenhagen <ossi@kde.org>.

Correct some minor style nits.
2002-05-24 04:32:28 +00:00
Alfred Perlstein
2b75bbdb31 Undo namespace pollution by prefixing the globals pthread_guard_default and
pthread_page_size.

Fix a bunch line wrapping.

Pointed out by: deischen
2002-05-15 05:37:48 +00:00
Alfred Perlstein
efe5270b1e Don't use PAGE_SIZE in userland, instead use getpagesize(), this is to
allow running on other arches when the instructions are supported but
the page size granularity is not.

Glanced at by: peter
2002-05-13 07:58:15 +00:00
Alfred Perlstein
e5ba687a2c Use GCC's __attribute__ ((constructor)) mechanism to invoke the pthread
startup code rather than a static C++ object since c++ seems to be broken.

This doesn't seem to work for staticically linked program just yet, I'll
give that some more work when I get a chance.
2002-05-11 08:13:42 +00:00
Archie Cobbs
663fc9cc7c Make these functions cancellation points like they should be:
poll(2), readv(2), select(2), wait4(2), writev(2).

PR:		bin/37658
Reviewed by:	deischen
MFC after:	1 week
2002-05-02 19:58:43 +00:00
Archie Cobbs
ca0989d865 Make sure calls to pthread_cancel() do not take effect if the target
thread is already exiting.

PR:		bin/37614
Reviewed by:	deischen
MFC after:	1 week
2002-05-02 19:57:59 +00:00
Dag-Erling Smørgrav
d397408818 Usage style sweep: spell "usage" with a small 'u'.
Also change one case of blatant __progname abuse (several more remain)
This commit does not touch anything in src/{contrib,crypto,gnu}/.
2002-04-22 13:44:47 +00:00
David E. O'Brien
07a7a2eba8 The GCC developers have made good on their threats against #pragma for 3.1.
Use __weak_reference in place of the #pragma.

Submitted by:	eischen
2002-04-15 23:11:38 +00:00
David E. O'Brien
cb81cd7952 Sync SCM ID comments with libc. 2002-04-15 20:22:28 +00:00
Jeroen Ruigrok van der Werven
92d2baa6a2 Return correct number of total bits set in all fd_set's.
Change case of POLLNVAL as an error.
Remove POLLHUP and POLLERR from one case, their place is most likely
amongst read events.

PR:		33723
Submitted by:	Alexander Litvin <archer@whichever.org>
Reviewed by:	deischen [Provided a small change to the PR patch as well]
MFC after:	4 weeks
2002-04-09 05:41:00 +00:00
Mark Murray
4cd0119367 Do not use __progname directly (except in [gs]etprogname(3)).
Also, make an internal _getprogname() that is used only inside
libc. For libc, getprogname(3) is a weak symbol in case a
function of the same name is defined in userland.
2002-03-29 22:43:43 +00:00
Daniel Eischen
3003bdb598 Add the ability to recognize old references to keys, and return NULL
when old keys are referenced (after pthread_key_delete()) via
pthread_getspecific().
2002-03-19 22:58:56 +00:00
Brian S. Dean
b18ae9245d Fix the return code from pthread_rwlock_try[rw|rd]lock() functions;
these should return EBUSY when the calling thread would block.

MFC after: 2 weeks
2002-03-15 18:27:58 +00:00
Daniel Eischen
ca4b2c1a79 Properly clear the status of a join operation if the joining thread is
canceled or the joinee is detached.
2002-03-06 19:28:41 +00:00
Daniel Eischen
9e9c4443f6 Don't rely on <sys/signal.h> to include <sys/ucontext.h> 2002-02-17 17:21:27 +00:00
Maxim Konovalov
0878d2e5e9 Correct a typo pthread_attr_setscope() function fails unconditionally
due to.

PR:		misc/30699
Reviewed by:	jasone, ru
Approved by:	jasone, ru
MFC after:	1 week
2002-02-14 15:20:36 +00:00
Daniel Eischen
69c287d288 This has been sitting in my local tree long enough. Remove the use
of an alternate signal stack for handling signals.  Let the kernel
send signals on the stack of the current thread and teach the threads
signal handler how to deliver signals to the current thread if it
needs to.  Also, always store a threads context as a jmp_buf.  Eventually
this will change to be a ucontext_t or mcontext_t.

Other small nits.  Use struct pthread * instead of pthread_t in internal
library routines.  The threads code wants struct pthread *, and pthread_t
doesn't necessarily have to be the same.

Reviewed by:	jasone
2002-02-09 19:58:41 +00:00
Daniel Eischen
2d170746c7 Use the real function address (instead of function address + 8) for the
return address when modifying a jmp_buf to create a new thread context.
Also set t12 with the return address.

This should fix libc_r on alpha.

With much detective work by: Bernd Walter <ticso@cicely.de>
2001-12-22 06:11:06 +00:00
Daniel Eischen
7512c816c0 Fix the retrieval of USRSTACK via sysctl so that it works for 64-bit
archs.  This should fix libc_r on alpha.

Submitted by:	Bernd Walter <ticso@cicely9.cicely.de>
2001-12-18 02:02:59 +00:00
Daniel Eischen
320bfcf3f1 When cancelling a thread while in a join operation, do not detach
the target thread of the join operation.  This allows the cancelled
thread to detach the target thread in its cancellation handler.
This bug was found by Butenhof's cancel_subcontract test.

Reviewed by:	jasone
2001-12-16 13:26:44 +00:00
Daniel Eischen
35686a943a Pull the target thread of a join operation from the correct place
when cancelling a thread.
2001-12-15 15:52:24 +00:00
Daniel Eischen
ccc7b69205 Fix pthread_join so that it works if the target thread exits while
the joining thread is in a signal handler.

Reported by:	Loren James Rittle <rittle@labs.mot.com>
MFC after:	1 week
2001-11-17 14:28:39 +00:00
Murray Stokely
5e77dc7342 Describe handling of NULLs passed to pthread_setcancelstate().
PR:		docs/31745
Submitted by:	Andrew <andrew@ugh.net.au>
2001-11-05 08:21:32 +00:00
Dima Dorfman
5e52f30031 Mark up NULL in .Dv.
PR:		31747
Submitted by:	<andrew@ugh.net.au>
2001-11-04 23:13:03 +00:00
Peter Wemm
eb9053b12f Make libc_r check the kern.usrstack sysctl instead of using internal
kernel #defines to figure out where the stack is located.  This stops
libc_r from exploding when the kernel is compiled with a different
KVM size.  IMHO this is all kinda bogus, it would be better to just
check %esp and work from that.
2001-10-26 21:19:22 +00:00
Ruslan Ermilov
98f9b06876 Style: sort __sys_foo() prototypes, tabs -> spaces, etc. 2001-10-26 18:45:02 +00:00
Ruslan Ermilov
53cff25eeb Removed:
- uthread_signal.c; libc_r does not wrap signal() since 1998/04/29.

- uthread_attr_setprio.c; it was never connected to the build, and
  pthread_attr_setprio() does not exist in POSIX.

- uthread_sigblock.c and uthread_sigsetmask.c; these were no-ops
  bloating libc_r's space.

pthread_private.h:

- Removed prototypes of non-syscalls: send().

- Removed prototypes of unused syscalls: sigpending(), sigsuspend(),
  and select().

- Fixed prototype of fork().

- MFS: Fixed prototypes of <sys/socket.h> syscalls.

Reviewed by:	deischen
Approved by:	deischen, jasone
2001-10-26 17:46:36 +00:00
Peter Wemm
9d91d74d2b Change #include "DEFS.h" to <machine/asm.h>. 2001-10-25 01:30:54 +00:00
Bruce Evans
6eabd84580 Compensate for "Compensate for header dethreading" by backing it out. 2001-10-10 17:48:44 +00:00
Daniel Eischen
7ae9a22df2 Limit maximum poll interval to 60 seconds. This prevents an overflow
from occurring when converting from a timeval/timespec to a timeout in
milliseconds.

Submitted by:	dwmalone
2001-10-07 02:34:43 +00:00
Ruslan Ermilov
32eef9aeb1 mdoc(7) police: Use the new .In macro for #include statements. 2001-10-01 16:09:29 +00:00
Ruslan Ermilov
d6002fef6f Use ``.Rv -std'' wherever possible.
Submitted by:	yar
2001-08-31 09:57:38 +00:00
Kris Kennaway
6dac8ac9e5 Mark some functions as __printflike() and/or taking const char * arguments
instead of char *.

MFC after:	2 weeks
2001-08-20 12:53:36 +00:00
Jason Evans
204e56e381 Fix logic errors in pthread_cond_wait() and pthread_cond_timedwait() that
could cause deadlock after interruption due to a signal.

Reviewed by:	deischen
2001-08-19 20:05:42 +00:00
Jason Evans
8588aeec8c Fix a bug in canceling joining threads.
Do not detach canceled threads.

Reported by:		Arno Klaassen <arno@heho.snv.jussieu.fr>
Collaboration with:	deischen
2001-08-16 06:31:32 +00:00
Ruslan Ermilov
04da392069 mdoc(7) police: s/OpenBSD/.Ox/ where appropriate. 2001-08-13 16:43:02 +00:00
Ruslan Ermilov
c5e7e03a14 Spell "FreeBSD" with "F" and "BSD" in uppercase. 2001-08-13 16:33:00 +00:00
Ruslan Ermilov
8af1452cf8 Removed duplicate VCS ID tags, as per style(9). 2001-08-13 14:06:34 +00:00
Warner Losh
e54b5dd9ff Make the name parameter const char *. 2001-08-11 05:16:00 +00:00
Yaroslav Tykhiy
b1250632c5 Use the ``.Rv -std'' mdoc(7) macro in appropriate cases.
Reviewed by:	ru
2001-08-09 13:32:13 +00:00
Jason Evans
aa33517e94 Implement pthread_attr_[gs]etguardsize(). Non-default-size stacks used to
be malloc()ed, but they are now allocated using mmap(), just as the
default-size stacks are.  A separate cache of stacks is kept for
non-default-size stacks.

Collaboration with:	deischen
2001-07-20 04:23:11 +00:00
Dima Dorfman
7ebcc426ef Remove whitespace at EOL. 2001-07-15 07:53:42 +00:00
Ruslan Ermilov
a307d59838 mdoc(7) police: removed HISTORY info from the .Os call. 2001-07-10 13:41:46 +00:00
Dima Dorfman
70d51341bf mdoc(7) police: remove extraneous .Pp before and/or after .Sh. 2001-07-09 09:54:33 +00:00
Ruslan Ermilov
5521ff5a4d mdoc(7) police: sort SEE ALSO xrefs (sort -b -f +2 -3 +1 -2). 2001-07-06 16:46:48 +00:00
Daniel Eischen
a9513dc678 Clear the in thread scheduler flag after jumping to the start of
a signal handler from the scheduler.

MFC after:	1 week
2001-06-29 17:09:07 +00:00
Jason Evans
651974ee92 Fix a race condition in pthread_join(). All of the following must occur
atomically:

1) Search _thread_list for the thread to join.
2) Search _dead_list for the thread to join.
3) Set the running thread as the joiner.

While we're at it, fix a race in the case where multiple threads try to
join on the same thread.  POSIX says that the behavior of multiple joiners
is undefined, but the fix is cheap as a result of the other fix.
2001-06-27 11:41:15 +00:00
Gregory Neil Shapiro
c1c5db8149 Typo fix: requires -> reacquires
Submitted by:	Murray S. Kucherawy <msk@sendmail.com>
MFC after:	3 days
2001-06-27 06:01:17 +00:00
Dima Dorfman
d33f4d20c9 Add a missing word.
Obtained from:	OpenBSD
2001-06-05 00:25:18 +00:00
Dima Dorfman
5940a2ebe0 Add a missing word. 2001-06-05 00:11:08 +00:00
Jason Evans
c024882f08 Add a test for PR 24345. 2001-05-20 23:12:13 +00:00
Jason Evans
b39e7e33f1 Update the verify script. 2001-05-20 23:11:54 +00:00
Jason Evans
745b431dc6 Don't define _REENTRANT, since the Makefile does so. 2001-05-20 23:11:09 +00:00
Jason Evans
dd2d9a766b Fix a typo. 2001-05-20 23:10:30 +00:00
Jason Evans
6699b0c6fe Instead of using a join queue for each thread, use a single pointer to
keep track of a joiner.  POSIX only supports a single joiner, so this
simplification is acceptable.

At the same time, make sure to mark a joined thread as detached so that
its resources can be freed.

Reviewed by:	deischen
PR:		24345
2001-05-20 23:08:33 +00:00
Ruslan Ermilov
108b08b24e Fixed typo in the description.
PR:		docs/27411
Submitted by:	David Wimsey <dwimsey@rtci.com>
2001-05-18 06:56:03 +00:00
Jason Evans
ffc19644c0 Condition variable waiters are queued in descending priority order, so
there is no need to wake all waiters to assure that the highest priority
thread is run.  As the semaphore code is written, there was no correctness
problem, but the change improves sem_post() performance.

Pointed out by:	deischen
2001-05-18 00:36:05 +00:00
Jason Evans
1317e200a8 Mark a thread that is suspended while sleeping as interrupted. 2001-05-16 21:58:45 +00:00
Akinori MUSHA
3b26be6ae1 Properly copy the P_ALTSTACK flag in struct proc::p_flag to the child
process on fork(2).

It is the supposed behavior stated in the manpage of sigaction(2), and
Solaris, NetBSD and FreeBSD 3-STABLE correctly do so.

The previous fix against libc_r/uthread/uthread_fork.c fixed the
problem only for the programs linked with libc_r, so back it out and
fix fork(2) itself to help those not linked with libc_r as well.

PR:		kern/26705
Submitted by:	KUROSAWA Takahiro <fwkg7679@mb.infoweb.ne.jp>
Tested by:	knu, GOTOU Yuuzou <gotoyuzo@notwork.org>,
		and some other people
Not objected by:	hackers
MFC in:		3 days
2001-05-07 18:07:29 +00:00
Daniel Eischen
59cc2dcac7 Move the check for a pending signals to after the thread has been
placed in any scheduling queue(s).  The process of dispatching
signals to a thread can change its state which will attempt to add
or remove the thread from any scheduling queue to which it belongs.
This can break some assertions if the thread isn't in the queue(s)
implied by its state.

When adding dispatching a pending signal to a thread, be sure to
remove the signal from the threads set of pending signals.

PR:		27035
Tested by:	brian
MFC in:		1 week
2001-05-04 20:37:07 +00:00
Mark Murray
98d2ef9e72 Compenate for header dethreading. 2001-05-01 09:32:34 +00:00
Daniel Eischen
9391331024 Typo; fix open() so that it is not a cancellation point when called
from libc.
2001-04-18 12:42:11 +00:00
Daniel Eischen
1cf08f3929 Reinstall the alternate signal stack after a fork.
PR:		25110
Tested by:	knu
2001-04-18 12:40:30 +00:00
Daniel Eischen
f9c408bc01 Clean up a bit. Use the correct TAILQ link when walking the thread
lists to free thread resources after a fork (in the child).  Also
remember to free the dead thread list.
2001-04-10 04:25:49 +00:00
Daniel Eischen
ac530e7b3a Added a missing set of braces to a conditional that encompasses more than
one statement.
2001-04-10 04:22:24 +00:00
Daniel Eischen
437df4859a To be consistent, use the __weak_reference macro from <sys/cdefs.h>
instead of #pragma weak to create weak definitions.

Suggested by:	bde
2001-04-10 04:19:21 +00:00
Thomas Moestl
8b28ef9528 Activate build of posix1e extensions in libc and libc_r that have been
moved in from libposix1e, and deactivate build of the soon-to-be-removed
libposix1e.

Approved by:	rwatson
Obtained from:	TrustedBSD Project
2001-04-04 18:17:28 +00:00
Thomas Moestl
16cb0dd753 Add thread safety wrappers for the posix1e syscalls that deal with file
descriptors.

Approved by:	rwatson
Obtained from:	TrustedBSD Project
2001-04-04 18:10:25 +00:00
Ian Dowse
92f5474235 Add a leading underscore to the pthread_main_np function name, and
a "#pragma weak" directive linking the external symbol. This matches
the other pthread_* definitions, and ensures that users of this
function from within libc get the real version, not the stub.

Suggested by:	deischen
Reviewed by:	deischen, alfred
2001-04-03 22:25:39 +00:00
Ruslan Ermilov
4a558355e5 MAN[1-9] -> MAN. 2001-03-27 17:27:19 +00:00
Alfred Perlstein
8360efbd6c Bring in a hybrid of SunSoft's transport-independent RPC (TI-RPC) and
associated changes that had to happen to make this possible as well as
bugs fixed along the way.

  Bring in required TLI library routines to support this.

  Since we don't support TLI we've essentially copied what NetBSD
  has done, adding a thin layer to emulate direct the TLI calls
  into BSD socket calls.

  This is mostly from Sun's tirpc release that was made in 1994,
  however some fixes were backported from the 1999 release (supposedly
  only made available after this porting effort was underway).

  The submitter has agreed to continue on and bring us up to the
  1999 release.

  Several key features are introduced with this update:
    Client calls are thread safe. (1999 code has server side thread
    safe)
    Updated, a more modern interface.

  Many userland updates were done to bring the code up to par with
  the recent RPC API.

  There is an update to the pthreads library, a function
  pthread_main_np() was added to emulate a function of Sun's threads
  library.

  While we're at it, bring in NetBSD's lockd, it's been far too
  long of a wait.

  New rpcbind(8) replaces portmap(8) (supporting communication over
  an authenticated Unix-domain socket, and by default only allowing
  set and unset requests over that channel). It's much more secure
  than the old portmapper.

  Umount(8), mountd(8), mount_nfs(8), nfsd(8) have also been upgraded
  to support TI-RPC and to support IPV6.

  Umount(8) is also fixed to unmount pathnames longer than 80 chars,
  which are currently truncated by the Kernel statfs structure.

Submitted by: Martin Blapp <mb@imp.ch>
Manpage review: ru
Secure RPC implemented by: wpaul
2001-03-19 12:50:13 +00:00
Daniel Eischen
af4878847e Correct a race condition where it was possible for a signaled
thread to become stranded and not placed in the run queue.

MFC Candidate

Reported by:	tegge
2001-03-09 16:05:43 +00:00
Ruslan Ermilov
0d42ab242e mdoc(7) police: fix markup. 2001-03-02 09:59:58 +00:00
Ruslan Ermilov
096841eceb Use ``.St -p1003.1-96''. 2001-02-26 15:16:43 +00:00
Ruslan Ermilov
589a5e341f /^\.St/ s/-iso9945-1/-p1003.1-96/ 2001-02-26 14:48:38 +00:00
Daniel Eischen
c33f8c177f Really set the flags for a private mutex (used by libc/libc_r). 2001-02-26 01:06:52 +00:00
Daniel Eischen
c6f2aed102 Limit threads clock resolution to no less than 1000usec (1000Hz).
PR:		25300
Submitted by:	Tom Pavel <pavel@alum.mit.edu> (in part)
2001-02-26 01:05:33 +00:00
Daniel Eischen
f434cd45ed Remove (int) file descriptor locking. It should be up to the
application to provide locking for I/O operations.  This doesn't
break any of my tests, but the old behavior can be restored by
compiling with _FDLOCKS_ENABLED.  This will eventually be removed
when it is obvious it does not cause any problems.

Remove most of flockfile implementation, with the exception of
flockfile_debug.

Make error messages more informational (submitted by Mike Heffner
<spock@techfour.net>, who's now known as mikeh@FreeBSD.org).
2001-02-11 22:07:32 +00:00
Nik Clayton
7b79d3ab37 Fix typo.
PR:             docs/23936
Submitted by:   Garret Rooney <rooneg@rpi.edu>
2001-02-02 03:32:03 +00:00
Ruslan Ermilov
d0353b836e mdoc(7) police: split punctuation characters + misc fixes. 2001-02-01 16:38:02 +00:00
Daniel Eischen
f8a19b12fb s/_thread_sys_write/__sys_write/
Submitted by:	Mike Heffner <mheffner@vt.edu>
2001-01-31 02:16:57 +00:00
Daniel Eischen
f47892a9f7 Unbreak world by correctly specifying the prototype for __sys_aio_suspend.
A make buildworld was done but not with the committed pthread_private.h.

Reported by:	Manfred Antar <null@pozo.com>
2001-01-29 18:59:53 +00:00
Daniel Eischen
221b1e69c5 _exit in libc is now __sys_exit not __sys__exit.
Add another check for thread library initialization (jdp, we
really need a way to get _thread_init called at program start
before any constructors are run).
2001-01-29 03:24:23 +00:00
Daniel Eischen
75f7221ee6 -pthread -> -lc_r 2001-01-24 13:41:04 +00:00
Daniel Eischen
e5106342c6 Add weak definitions for wrapped system calls. In general:
_foo - wrapped system call
	foo - weak definition to _foo

and for cancellation points:

	_foo - wrapped system call
	__foo - enter cancellation point, call _foo(), leave
	        cancellation point
	foo - weak definition to __foo

Change use of global _thread_run to call a function to get the
currently running thread.

Make all pthread_foo functions weak definitions to _pthread_foo,
where _pthread_foo is the implementation.  This allows an application
to provide its own pthread functions.

Provide slightly different versions of pthread_mutex_lock and
pthread_mutex_init so that we can tell the difference between
a libc mutex and an application mutex.  Threads holding mutexes
internal to libc should never be allowed to exit, call signal
handlers, or cancel.

Approved by:	-arch
2001-01-24 13:03:38 +00:00
David E. O'Brien
cad1dd7bb4 Force strong references to several pthread_* functions which are weakly
referenced to by libgcc.a.

This is needed when linking statically as SVR4 (ie, ELF) behavior is to only
link in a module if it satisfies an undefined strong reference from somewhere.
(this surprises a lot of people) Things are different when using shared libs,
the entire library and its modules and their symbols are available at run-time
(when the weak reference is seen to still be unsatisfied and is satisfied on
the spot), this is not the case with static libs.

Thus one can have a static binary with unresolved week references, and at
run-time dereference a NULL pointer.

Submitted by:	eischen
2001-01-06 06:07:52 +00:00
Ruslan Ermilov
4263595653 Prepare for mdoc(7)NG. 2000-12-29 14:08:20 +00:00
Daniel Eischen
9ffc4537c8 When retrieving the time of day in nanosleep(), store it in the
global time of day.  This costs us nothing, but is a bit of a hack
to work around a process blocking and not having the time updated
by an ITIMER_PROF signal.

PR:		23679
2000-12-20 17:04:12 +00:00
Daniel Eischen
d73eb8c8ca Enable check for pending signals after calling a signal handler.
Restoration of a threads signal mask after invocation of a signal
handler may allow pending signals to become deliverable.

PR:		23647
2000-12-20 16:55:57 +00:00
Ruslan Ermilov
c23155a43a mdoc(7) police: Er macro usage cleanup. 2000-11-22 16:02:00 +00:00
Daniel Eischen
47c1571785 Change a "while {}" loop to a "do {} while" to allow it to be
executed at least once, fixing pthread_mutex_lock() for recursive
mutex lock attempts.

Correctly set a threads signal mask while it is executing a signal
handler.  The mask should be the union of its current mask, the
signal being handled, and the mask from the signal action.

Reported by: Dan Nelson <dnelson@emsphone.com>

MFC Candidate
2000-11-20 13:12:44 +00:00
Daniel Eischen
499c499c61 Fix MD macros to work for alpha. Without this fix, threads under alpha
seem to be totally broke.

MFC Candidate

Submitted by:	gallatin
2000-11-20 01:57:19 +00:00
Daniel Eischen
f17033e38d Fix a bug where a statically initialized condition variable
was not getting properly initialized in pthread_cond_signal()
and pthread_cond_broadcast().  Reportedly, this can cause
an application to die.

MFC candidate

Submitted by:	ade
2000-11-16 22:50:33 +00:00
Daniel Eischen
810888e2f8 Delete 4 lines of misleading/incorrect comments. 2000-11-16 19:15:56 +00:00
Daniel Eischen
eb4463fde6 When entering the scheduler from the signal handler, tell
the kernel to (re)use the alternate signal stack.  In this
case, we don't return normally from the signal handler,
so the kernel still thinks we are using the signal stack.
The fixes a nasty bug where the signal handler can start
fiddling with the stack of a thread while the handler is
actually running on the same stack.

MFC candidate
2000-11-14 20:00:19 +00:00
Ruslan Ermilov
b5c508fba3 Use Fx macro wherever possible. 2000-11-14 11:20:58 +00:00
David E. O'Brien
fe17fef5d2 Bump the shared lib version. There seems to have been an incompatible
change committed to RELENG_4 where a bump there is now necessary.
We've got to go before RELENG_4 does.
2000-11-14 02:46:23 +00:00
Daniel Eischen
00e550955e Correct the logic for checking the emptiness of the waiting queue.
This fixes a potential problem where the file descriptors would not
be polled causing waiting threads to stay waiting.  Doh!

MFC candidate.
2000-11-11 22:20:36 +00:00
Daniel Eischen
b5a8a15c2f Don't needlessly poll file descriptors when there are no
file descriptors needing to be polled (Doh!).  Reported
by Dan Nelson <dnelson@emsphone.com>.

Don't install and start the scheduling timer until the
first thread is created.  This prevents the overhead of
having a periodic scheduling signal in a single threaded
program.  Reported by Dan Nelson <dnelson@emsphone.com>.

Allow builtin longjmps out of application installed
signal handlers without the need perform any post-handler
cleanup:

  o Change signal handling to save the threads interrupted
    context on the stack.  The threads current context is
    now always stored in the same place (in the pthread).
    If and when a signal handler returns, the interrupted
    context is copied back to the storage area in the pthread.

  o Before calling invoking a signal handler for a thread,
    back the thread out of any internal waiting queues
    (mutex, CV, join, etc) to which it belongs.

Rework uthread_info.c a bit to make it easier to change
the format of a thread dump.

Use an alternal signal stack for the thread library's
signal handler.  This allows us to fiddle with the main
threads stack without fear of it being in use.

Reviewed by:	jasone
2000-11-09 05:08:26 +00:00
John Polstra
a9bda22cd6 At the beginning of pthread_mutex_lock(), call _thread_init() if
necessary.  This works around a bug in old versions of libgcc_r.a
which are statically linked into old executables.
2000-11-01 20:19:07 +00:00
Daniel Eischen
c418675341 Make pthread_kill() know about temporary signal handlers installed
by sigwait().  This prevents a signal from being sent to the process
when there are no application installed signal handlers.

Correct a typo in sigwait (foo -> foo[i]).
2000-10-25 11:46:07 +00:00
Daniel Eischen
2fbba8b1b8 We use ___setjmp (non-signal saving) to setup a signal frame. When
adding a signal frame to a thread, be sure to label the context
correctly so we don't restore an uninitialized process mask.

Reported by:	kimc@W8HD.ORG and Andrey Rouskol <anry@sovintel.ru>
2000-10-22 18:35:11 +00:00
Peter Wemm
100063a74b Try and get libc_r to compile again on the alpha after deischen's commit 2000-10-17 06:31:40 +00:00
Brian Somers
9c8ec4f794 #include <sys/types.h> 2000-10-15 20:04:09 +00:00
Daniel Eischen
b4145b0bfa Enable _PTHREADS_INVARIANTS until the recent libc_r changes are
shaken out.
2000-10-13 22:19:50 +00:00
Daniel Eischen
fbeb36e4bf Implement zero system call thread switching. Performance of
thread switches should be on par with that under scheduler
activations.

  o Timing is achieved through the use of a fixed interval
    timer (ITIMER_PROF) to count scheduling ticks instead
    of retrieving the time-of-day upon every thread switch
    and calculating elapsed real time.

  o Polling for I/O readiness is performed once for each
    scheduling tick instead of every thread switch.

  o The non-signal saving/restoring versions of setjmp/longjmp
    are used to save and restore thread contexts.  This may
    allow the removal of _THREAD_SAFE macros from setjmp()
    and longjmp() - needs more investigation.

Change signal handling so that signals are handled in the
context of the thread that is receiving the signal.  When
signals are dispatched to a thread, a special signal handling
frame is created on top of the target threads stack.  The
frame contains the threads saved state information and a new
context in which the thread can run.  The applications signal
handler is invoked through a wrapper routine that knows how
to restore the threads saved state and unwind to previous
frames.

Fix interruption of threads due to signals.  Some states
were being improperly interrupted while other states were
not being interrupted.  This should fix several PRs.

Signal handlers, which are invoked as a result of a process
signal (not by pthread_kill()), are now called with the
code (or siginfo_t if SA_SIGINFO was set in sa_flags) and
sigcontext_t as received from the process signal handler.

Modify the search for a thread to which a signal is delivered.
The search algorithm is now:

  o First thread found in sigwait() with signal in wait mask.
  o First thread found sigsuspend()'d on the signal.
  o Current thread if signal is unmasked.
  o First thread found with signal unmasked.

Collapse machine dependent support into macros defined in
pthread_private.h.  These should probably eventually be moved
into separate MD files.

Change the range of settable priorities to be compliant with
POSIX (0-31).  The threads library uses higher priorities
internally for real-time threads (not yet implemented) and
threads executing signal handlers.  Real-time threads and
threads running signal handlers add 64 and 32, respectively,
to a threads base priority.

Some other small changes and cleanups.

PR:		17757 18559 21943
Reviewed by:	jasone
2000-10-13 22:12:32 +00:00
Maxim Sobolev
24a1dab36f Add thread-safe wrapper for fpathconf(2) syscall.
Reviewed by:	jlemon
2000-09-19 18:01:03 +00:00
Jason Evans
f3ee83c3bf The second call to _thread_kern_sig_defer() in sem_post() should be a call
to _thread_kern_sig_undefer().
2000-08-23 07:59:50 +00:00
Alfred Perlstein
022daa34f2 Fix an off-by-one error in the recursive mutex handling that made it
prematurely release recursive mutexes.

Test case provided by: Bradley T. Hughes <bhughes@trolltech.com>
Reviewed by: deischen
2000-08-13 01:30:36 +00:00
Jonathan Lemon
532c92a865 Add wrapper for kevent() syscall
Noted as missing by: nicolas.leonard@animaths.com
2000-08-07 16:51:56 +00:00
Jason Evans
b167c9a5c1 Make sem_post() safe to call from within a signal handler, as required by
POSIX/SUSv2.
2000-08-01 21:19:09 +00:00
Doug Rabson
678ef1b49e Call _thread_init() from pthread_once() if it has not already been called.
This fixes a segfault in some C++ programs which use exceptions before
main() has been called (i.e. from global constructors).

Reviewed by: deischen
2000-07-21 09:31:13 +00:00
Jason Evans
c1110eb673 pthread_once --> pthread_once_t. 2000-07-19 16:38:07 +00:00
Jason Evans
8e234adf86 Change my email address in the copyright notices for the sake of consistency
(jasone@canonware.com --> jasone@freebsd.org).
2000-07-18 01:38:19 +00:00
Jason Evans
390a1cd5eb Deal correctly with statically initialized condition variables in
pthread_cond_signal(), pthread_cond_broadcast(), and pthread_cond_timedwait().

Do not dump core in pthread_cond_timedwait() (due to a NULL pointer
dereference) if attempting to wait on an uninitialized condition variable.

PR:	bin/18099
2000-07-17 22:55:05 +00:00