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* Force strong references to several pthread_* functions which are weaklyobrien2001-01-061-0/+32
| | | | | | | | | | | | | | | | 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
* Use macro API to <sys/queue.h>phk2000-12-311-4/+4
| | | | | | | Submitted by: "Peter Avalos" <pavalos@theshell.com> Reviewed by: /sbin/md5 [*] [*] This line appears courtesy of Mr. Warner Losch, all rights reversed.
* Prepare for mdoc(7)NG.ru2000-12-291-0/+1
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* When retrieving the time of day in nanosleep(), store it in thedeischen2000-12-201-4/+12
| | | | | | | | 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
* Enable check for pending signals after calling a signal handler.deischen2000-12-201-0/+3
| | | | | | | Restoration of a threads signal mask after invocation of a signal handler may allow pending signals to become deliverable. PR: 23647
* mdoc(7) police: Er macro usage cleanup.ru2000-11-222-2/+6
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* Change a "while {}" loop to a "do {} while" to allow it to bedeischen2000-11-202-3/+7
| | | | | | | | | | | | | 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
* Fix MD macros to work for alpha. Without this fix, threads under alphadeischen2000-11-201-4/+4
| | | | | | | | seem to be totally broke. MFC Candidate Submitted by: gallatin
* Fix a bug where a statically initialized condition variabledeischen2000-11-161-2/+2
| | | | | | | | | | 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
* Delete 4 lines of misleading/incorrect comments.deischen2000-11-161-4/+0
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* When entering the scheduler from the signal handler, telldeischen2000-11-144-19/+38
| | | | | | | | | | | 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
* Use Fx macro wherever possible.ru2000-11-141-1/+2
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* Bump the shared lib version. There seems to have been an incompatibleobrien2000-11-141-1/+1
| | | | | change committed to RELENG_4 where a bump there is now necessary. We've got to go before RELENG_4 does.
* Correct the logic for checking the emptiness of the waiting queue.deischen2000-11-111-1/+1
| | | | | | | This fixes a potential problem where the file descriptors would not be polled causing waiting threads to stay waiting. Doh! MFC candidate.
* Don't needlessly poll file descriptors when there are nodeischen2000-11-0914-784/+627
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Prevent the thread-safe version of kevent from gettingdeischen2000-11-091-2/+3
| | | | | | | | into an infinite loop when a timeout value is supplied and the timeout expires. Reported by: Dan Nelson <dnelson@emsphone.com> Reviewed by: jasone, jlemon
* At the beginning of pthread_mutex_lock(), call _thread_init() ifjdp2000-11-011-0/+3
| | | | | necessary. This works around a bug in old versions of libgcc_r.a which are statically linked into old executables.
* Make pthread_kill() know about temporary signal handlers installeddeischen2000-10-252-32/+124
| | | | | | | 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]).
* We use ___setjmp (non-signal saving) to setup a signal frame. Whendeischen2000-10-221-1/+1
| | | | | | | 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>
* Try and get libc_r to compile again on the alpha after deischen's commitpeter2000-10-171-3/+3
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* #include <sys/types.h>brian2000-10-151-0/+2
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* Enable _PTHREADS_INVARIANTS until the recent libc_r changes aredeischen2000-10-131-1/+1
| | | | shaken out.
* Implement zero system call thread switching. Performance ofdeischen2000-10-1330-1191/+1869
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* Add thread-safe wrapper for fpathconf(2) syscall.sobomax2000-09-193-0/+48
| | | | Reviewed by: jlemon
* The second call to _thread_kern_sig_defer() in sem_post() should be a calljasone2000-08-231-1/+1
| | | | to _thread_kern_sig_undefer().
* Fix an off-by-one error in the recursive mutex handling that made italfred2000-08-131-3/+3
| | | | | | | prematurely release recursive mutexes. Test case provided by: Bradley T. Hughes <bhughes@trolltech.com> Reviewed by: deischen
* kevent() is not a POSIX cancellation point, so _kevent() need not bejasone2000-08-081-7/+2
| | | | | | defined. Remove some unnecessary header file inclusions.
* Add wrapper for kevent() syscalljlemon2000-08-075-3/+85
| | | | Noted as missing by: nicolas.leonard@animaths.com
* Make sem_post() safe to call from within a signal handler, as required byjasone2000-08-012-0/+10
| | | | POSIX/SUSv2.
* Call _thread_init() from pthread_once() if it has not already been called.dfr2000-07-211-0/+2
| | | | | | | This fixes a segfault in some C++ programs which use exceptions before main() has been called (i.e. from global constructors). Reviewed by: deischen
* pthread_once --> pthread_once_t.jasone2000-07-191-1/+1
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* Change my email address in the copyright notices for the sake of consistencyjasone2000-07-1825-25/+25
| | | | (jasone@canonware.com --> jasone@freebsd.org).
* Deal correctly with statically initialized condition variables injasone2000-07-171-18/+17
| | | | | | | | | 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
* Reshuffle the SEE ALSO section.jasone2000-07-173-7/+7
| | | | Prompted by: sheldonh
* Remove DEBUG_FLAGS=-g3, which never should have been committed.jasone2000-07-051-2/+0
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* Fix typo in SEE ALSO section.jasone2000-06-281-1/+1
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* If multiple threads are blocked in sigwait() for the same signal that doesjasone2000-06-273-4/+37
| | | | | | | | | | | | | | | not have a user-supplied signal handler, when a signal is delivered, one thread will receive the signal, and then the code reverts to having no signal handler for the signal. This can leave the other sigwait()ing threads stranded permanently if the signal is later ignored, or can result in process termination when the process should have delivered the signal to one of the threads in sigwait(). To fix this problem, maintain a count of sigwait()ers for each signal that has no default signal handler. Use the count to correctly install/uninstall dummy signal handlers. Reviewed by: deischen
* pthread_mutex_lock(), pthread_cond_trywait(), and pthread_cond_wait() arejasone2000-06-146-36/+125
| | | | | | | | | | not allowed to return EINTR, but use of pthread_suspend_np() could cause EINTR to be returned. To fix this, restructure pthread_suspend_np() so that it does not interrupt a thread that is waiting on a mutex or condition, and keep enough state around that pthread_resume_np() can fix things up afterwards. Reviewed by: deischen
* Fix a misspelling: undefied -> undefinedchris2000-05-271-1/+1
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* Back out the previous change to the queue(3) interface.jake2000-05-262-23/+23
| | | | | | It was not discussed and should probably not happen. Requested by: msmith and others
* Change the way that the queue(3) structures are declared; don't assume thatjake2000-05-232-23/+23
| | | | | | | | the type argument to *_HEAD and *_ENTRY is a struct. Suggested by: phk Reviewed by: phk Approved by: mdodd
* Fix a memory leak. pthread_set_name_np() allocates space for a name, butjasone2000-05-161-2/+6
| | | | | | was not deallocating space for the previous name, if any. PR: misc/18504
* Fix a memory leak. pthread_set_name_np() allocates space for a name, butjasone2000-05-161-0/+4
| | | | | | _thread_gc() was not deallocating it. PR: misc/18504
* add MLINKS: pthread_testcancel(3) -> pthread_setcanceltype(3)phantom2000-05-121-0/+1
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* "Fixed" missing include in synopsis. POSIX.1-1996 only specifiesbde2000-05-112-0/+2
| | | | | including <signal.h>, but that must be a bug in POSIX.1, because it also specifies that the relevant prototype is [only] in <pthread.h>.
* Fixed misspelling of a struct tag in a function parameter type.bde2000-05-111-1/+1
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* Fixed missing consts for function parameters, so that the code matchesbde2000-05-113-3/+6
| | | | | the man page and POSIX.1. Fixed nearby misformatting. Fixed a missing prototype.
* Fix miscellaneous mdoc macro argument limit infringements.sheldonh2000-05-091-1/+1
| | | | | PR: 18465 Reported by: Kazu TAKAMUNE <takamune@avrl.mei.co.jp>
* mdoc(7) cleanup:phantom2000-05-047-63/+79
| | | | | | | | | | | . use real function names as `.Nm' macro argument in NAME section. It allows them to appear in apropos(1) or whatis(1) output. . replace empty lines with `.Pp' macro. . replace hardcoded standard names with their `.St' macro equivalents. . sort cross references in SEE ALSO section
* Add missing .El macro.jasone2000-05-031-0/+1
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