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* Simplify sytem call renaming. Instead of _foo() <-- _libc_foo <-- foo(),Jason Evans2000-01-2759-134/+624
| | | | | | | | | | | | | | | | | | | | just use _foo() <-- foo(). In the case of a libpthread that doesn't do call conversion (such as linuxthreads and our upcoming libpthread), this is adequate. In the case of libc_r, we still need three names, which are now _thread_sys_foo() <-- _foo() <-- foo(). Convert all internal libc usage of: aio_suspend(), close(), fsync(), msync(), nanosleep(), open(), fcntl(), read(), and write() to _foo() instead of foo(). Remove all internal libc usage of: creat(), pause(), sleep(), system(), tcdrain(), wait(), and waitpid(). Make thread cancellation fully POSIX-compliant. Suggested by: deischen Notes: svn path=/head/; revision=56698
* Fix millisecond to nanosecond conversion.Jason Evans2000-01-221-1/+1
| | | | | | | PR: misc/16245 Notes: svn path=/head/; revision=56388
* Minor *jmp() cleanups.Jason Evans2000-01-202-13/+8
| | | | Notes: svn path=/head/; revision=56344
* Add sem_*() functions. Named semaphores and process-shared semaphoresJason Evans2000-01-203-0/+237
| | | | | | | | | | are not supported by this implementation, and the error return values from sem_init(), sem_open(), sem_close(), and sem_unlink() reflect this. Approved by: jkh Notes: svn path=/head/; revision=56320
* Do signal deferral for pthread_kill() as it was done in the old days.Jason Evans2000-01-203-30/+6
| | | | | | | Submitted by: deischen Notes: svn path=/head/; revision=56310
* Implement continuations to correctly handle [sig|_]longjmp() inside of aJason Evans2000-01-1915-83/+584
| | | | | | | | | | | | | | | | | | | | | | | | | signal handler. Explicitly check for jumps to anywhere other than the current stack, since such jumps are undefined according to POSIX. While we're at it, convert thread cancellation to use continuations, since it's cleaner than the original cancellation code. Avoid delivering a signal to a thread twice. This was a pre-existing bug, but was likely unexposed until these other changes were made. Defer signals generated by pthread_kill() so that they can be delivered on the appropriate stack. deischen claims that this is unnecessary, which is likely true, but without this change, pthread_kill() can cause undefined priority queue states and/or PANICs in [sig|_]longjmp(), so I'm leaving this in for now. To compile this code out and exercise the bug, define the _NO_UNDISPATCH cpp macro. Defining _PTHREADS_INVARIANTS as well will cause earlier crashes. PR: kern/14685 Collaboration with: deischen Notes: svn path=/head/; revision=56277
* Properly initialize the last active time of the initial thread. This fixesDaniel Eischen2000-01-181-0/+6
| | | | | | | | | | the case that a CPU hungry main thread is prevented from being preempted due to a negative calculation of its time slice. Reported by: Alexander Litvin <archer@lucky.net> Notes: svn path=/head/; revision=56236
* Track libc's three-tier symbol naming. libc_r must currently implementJason Evans2000-01-1254-60/+162
| | | | | | | | the _libc_*() entry points and add *() weak aliases. This will all change for the better when libc_r becomes libpthread. Notes: svn path=/head/; revision=55838
* Make sched_param parameter a const to comply with POSIX and SUSv2 specs.Daniel Eischen2000-01-101-1/+1
| | | | | | | | | | This doesn't need to be applied to stable, because somehow -stable seems to have gotten it right. Reviewed by: jasone Notes: svn path=/head/; revision=55708
* Change REGENTS -> AUTHOR in the copyright.Daniel Eischen2000-01-061-1/+2
| | | | | | | | | | | Add $FreeBSD$. I missed this file in a previous commit. Pointed out by: tg Notes: svn path=/head/; revision=55504
* Don't explicitly mmap() red zones at the bottom of thread stacks (exceptJason Evans1999-12-293-16/+26
| | | | | | | | | | | | | the initial thread). Instead, just leave an unmapped gap between thread stacks and make sure that the thread stacks won't grow into these gaps, simply by limiting the size of the stacks with the 'len' argument to mmap(). This (if I understand correctly) reduces VM overhead considerably. Reviewed by: deischen Notes: svn path=/head/; revision=55222
* -Wall and minor style(9) cleanups.Daniel Eischen1999-12-288-16/+15
| | | | Notes: svn path=/head/; revision=55194
* Change stack allocation algorithm to make better use of memoryDaniel Eischen1999-12-282-22/+20
| | | | | | | | (it was leaving an unused block). Also protect the global stack pointer from context changes while fiddling with it. Notes: svn path=/head/; revision=55193
* Don't wakeup threads when there is a process signal and no installedDaniel Eischen1999-12-281-23/+37
| | | | | | | | | | | handler. Thread-to-thread signals (pthread_signal) are treated differently than process signals; a pthread_signal can wakeup a blocked thread if a signal handler is not installed for that signal. Found by: ACE tests Notes: svn path=/head/; revision=55192
* Fix some minor POSIX/SUSv2 compliance nits.Jason Evans1999-12-181-7/+4
| | | | | | | PR: kern/11982 Notes: svn path=/head/; revision=54757
* Fix problems with cancellation while in critical regions.Daniel Eischen1999-12-178-24/+53
| | | | | | | | | | | | | | o Cancellation flags were not getting properly set/cleared. o Loops waiting for internal locks were not being exited correctly by a cancelled thread. o Minor spelling (cancelation -> cancellation) and formatting corrections (missing tab). Found by: tg Reviewed by: jasone Notes: svn path=/head/; revision=54708
* Fixes for signal handling:Daniel Eischen1999-12-175-147/+208
| | | | | | | | | | | | | | | | | o Don't call signal handlers with the signal handler access lock held. o Remove pending signals before calling signal handlers. If pending signals were not removed prior to handling them, invocation of the handler could cause the handler to be called more than once for the same signal. Found by: JB o When SIGCHLD arrives, wake up all threads in PS_WAIT_WAIT (wait4). PR: bin/15328 Reviewed by: jasone Notes: svn path=/head/; revision=54707
* Avoid an infinite loop if the last element of the iov array passed toJason Evans1999-12-161-1/+13
| | | | | | | | | writev() has an iov_len of 0. PR: bin/8281 Notes: svn path=/head/; revision=54701
* Change signal handling to conform to POSIX specified semantics.Daniel Eischen1999-12-044-27/+79
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Before this change, a signal was delivered to each thread that didn't have the signal masked. Signals also improperly woke up threads waiting on I/O. With this change, signals are now handled in the following way: o If a thread is waiting in a sigwait for the signal, then the thread is woken up. o If no threads are sigwait'ing on the signal and a thread is in a sigsuspend waiting for the signal, then the thread is woken up. o In the case that no threads are waiting or suspended on the signal, then the signal is delivered to the first thread we find that has the signal unmasked. o If no threads are waiting or suspended on the signal, and no threads have the signal unmasked, then the signal is added to the process wide pending signal set. The signal will be delivered to the first thread that unmasks the signal. If there is an installed signal handler, it is only invoked if the chosen thread was not in a sigwait. In the case that multiple threads are waiting or suspended on a signal, or multiple threads have the signal unmasked, we wake up/deliver the signal to the first thread we find. The above rules still apply. Reported by: Scott Hess <scott@avantgo.com> Reviewed by: jb, jasone Notes: svn path=/head/; revision=54138
* * Fix the stack allocation code so that it works for alpha. Change itDoug Rabson1999-11-282-6/+26
| | | | | | | | | | | | to use mmap(..., MAP_STACK, ...) on alpha too since that should work now. * Add hooks to allow GDB to access the internals of pthreads without having to know the exact layout of struct pthread. Reviewed by: deischen Notes: svn path=/head/; revision=53847
* add pthread_cancel, obtained from OpenBSD.Alfred Perlstein1999-11-2829-103/+829
| | | | | | | | | | | | | | | | | eischen (Daniel Eischen) added wrappers to protect against cancled threads orphaning internal resources. the cancelability code is still a bit fuzzy but works for test programs of my own, OpenBSD's and some examples from ORA's books. add readdir_r to both libc and libc_r add some 'const' attributes to function parameters Reviewed by: eischen, jasone Notes: svn path=/head/; revision=53812
* General clean-up of socket.h and associated sources to synchronise upPoul-Henning Kamp1999-11-249-9/+9
| | | | | | | | | | | | | | | with NetBSD and the Single Unix Specification v2. This updates some structures with other, almost equivalent types and effort is under way to get the whole more consistent. Also removes a double definition of INET6 and some other clean-ups. Reviewed by: green, bde, phk Some part obtained from: NetBSD, SUSv2 specification Notes: svn path=/head/; revision=53678
* Add the proper headers so that the SIGNOTEMPTY and SIGSETANDMarcel Moolenaar1999-09-301-0/+2
| | | | | | | macros are defined. Notes: svn path=/head/; revision=51816
* sigset_t change (part 5 of 5)Marcel Moolenaar1999-09-298-17/+37
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | ----------------------------- Most of the userland changes are in libc. For both the alpha and the i386 setjmp has been changed to accomodate for the new sigset_t. Internally, libc is mostly rewritten to use the new syscalls. The exception is in compat-43/sigcompat.c The POSIX thread library has also been rewritten to use the new sigset_t. Except, that it currently only handles NSIG signals instead of the maximum _SIG_MAXSIG. This should not be a problem because current applications don't use any signals higher than NSIG. There are version bumps for the following libraries: libdialog libreadline libc libc_r libedit libftpio libss These libraries either a) have one of the modified structures visible in the interface, or b) use sigset_t internally and may cause breakage if new binaries are used against libraries that don't have the sigset_t change. This not an immediate issue, but will be as soon as applications start using the new range to its fullest. NOTE: libncurses already had an version bump and has not been given one now. NOTE: doscmd is a real casualty and has been disconnected for the moment. Reconnection will eventually happen after doscmd has been fixed. I'm aware that being the last one to touch it, I'm automaticly promoted to being maintainer. According to good taste this means that I will receive a badge which either will be glued or mechanically stapled, drilled or otherwise violently forced onto me :-) NOTE: pcvt/vttest cannot be compiled with -traditional. The change cause sys/types to be included along the way which contains the const and volatile modifiers. I don't consider this a solution, but more a workaround. Notes: svn path=/head/; revision=51794
* Fix a memory leak: free the thread-specific poll_data, used in the select()Dmitrij Tejblum1999-08-301-0/+6
| | | | | | | | | | implementation. PR: 13368 Submitted by: Steve Bernacki, Jr. <steve@copacetic.net> Notes: svn path=/head/; revision=50660
* When checking for valid timevals in the wrapped select() and poll()Daniel Eischen1999-08-303-9/+14
| | | | | | | | routines, don't return EINVAL but set errno to EINVAL and return -1. Added a check in pthread_cond_timedwait for a null timespec pointer. Notes: svn path=/head/; revision=50601
* $Id$ -> $FreeBSD$Peter Wemm1999-08-28110-110/+110
| | | | Notes: svn path=/head/; revision=50476
* move sanity check of timeval struct so as not to segfault when passedAlfred Perlstein1999-08-201-5/+5
| | | | | | | | | | a null pointer. Pointed out by: Thomas Gellekum <tg@ihf.rwth-aachen.de> Reviewed by: eivind Notes: svn path=/head/; revision=50093
* When checking if there is a stack to free, observe the fact that itJohn Birrell1999-08-201-6/+23
| | | | | | | | | | | might have been mmapped, and if so, passing the pointer to free() is really not a good idea. [ In the next millenium, when I've taken over the world, I'm going to ban 8 character tabs. You've been warned. ] Notes: svn path=/head/; revision=50083
* time_to_sleep->tv_nsec > 1000000000Alfred Perlstein1999-08-191-2/+2
| | | | | | | | -to- time_to_sleep->tv_nsec >= 1000000000 Notes: svn path=/head/; revision=50066
* Sanity check time structures passed in, return EINVAL like the systemAlfred Perlstein1999-08-194-6/+18
| | | | | | | | | | | calls do to avoid corrupting the thread library's concept of wakeup time. PR: kern/12141 Reviewed by: deischen, eivind Notes: svn path=/head/; revision=50065
* handle under/overflow of time values in a more robust manner,Alfred Perlstein1999-08-191-3/+3
| | | | | | | | | | | there may be an overflow that need to be adjusted more than once. Pointed out by: Fabian Thylmann <fthylmann@stats.net> Reviewed by: eivind, jb Notes: svn path=/head/; revision=50057
* Fix description of the _thread_autoinit_dummy_decl trick.Ralf S. Engelschall1999-08-171-3/+3
| | | | Notes: svn path=/head/; revision=49958
* Add check for runnable threads before polling file descriptors.Daniel Eischen1999-08-121-14/+16
| | | | | | | Submitted by: tegge Notes: svn path=/head/; revision=49661
* Add RCS IDs to those files without them.Daniel Eischen1999-08-0598-108/+181
| | | | | | | | | | Fix copyrights (s/REGENTS/AUTHOR). Suggested by: tg Approved by: jb Notes: svn path=/head/; revision=49439
* Fix thread initialization to allow for the case where stdio fileDaniel Eischen1999-08-053-17/+21
| | | | | | | | | | descriptors are not opened. PR: bin/12853 Reviewed by: jb Notes: svn path=/head/; revision=49438
* Use USRSTACK (defined in <machine/vmparam.h>) to get top of the initial stack.Dmitrij Tejblum1999-07-122-16/+6
| | | | | | | PTHREAD_STACK_TOP was wrong for all supported architectures. Notes: svn path=/head/; revision=48784
* Fix a couple more coding style nits.Jason Evans1999-07-112-5/+5
| | | | Notes: svn path=/head/; revision=48749
* Modify previous changes to conform better to libc_r's coding style.Jason Evans1999-07-114-76/+113
| | | | | | | | | | | Always use mmap() for default-size stack allocation. Use MAP_ANON instead of MAP_STACK on the alpha architecture. Reduce the amount of code executed while owning _gc_mutex during stack allocation. Notes: svn path=/head/; revision=48748
* Always use growable thread stacks on the i386. The VM_STACK kernel optionJason Evans1999-07-064-27/+17
| | | | | | | | must be made default for the alpha before growable thread stacks are enabled for the alpha. Notes: svn path=/head/; revision=48609
* Use growable stacks for thread stacks that are the default stack size.Jason Evans1999-07-054-20/+159
| | | | | | | | | | | | | | | | Cache discarded default thread stacks for use in subsequent thread creations. Create a red zone at the end of each stack (including the initial thread stack), with the hope of causing a segfault if a stack overflows. To activate these modifications, add -D_PTHREAD_GSTACK to CFLAGS in src/lib/libc_r/Makefile. Since the modifications depend on the VM_STACK kernel option, I'm not sure how to safely use growable stacks by default. Testing, as well as algorithmic and stylistic comments are welcome. Notes: svn path=/head/; revision=48569
* Defer signals, so we will not wait for SIGCHLD after it was delivered.Dmitrij Tejblum1999-06-291-0/+5
| | | | Notes: svn path=/head/; revision=48349
* Fix few warnings on the alpha.Dmitrij Tejblum1999-06-232-3/+4
| | | | Notes: svn path=/head/; revision=48140
* In the words of the author:John Birrell1999-06-2029-1580/+1923
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | o The polling mechanism for I/O readiness was changed from select() to poll(). In additon, a wrapped version of poll() is now provided. o The wrapped select routine now converts each fd_set to a poll array so that the thread scheduler doesn't have to perform a bitwise search for selected fds each time file descriptors are polled for I/O readiness. o The thread scheduler was modified to use a new queue (_workq) for threads that need work. Threads waiting for I/O readiness and spinblocks are added to the work queue in addition to the waiting queue. This reduces the time spent forming/searching the array of file descriptors being polled. o The waiting queue (_waitingq) is now maintained in order of thread wakeup time. This allows the thread scheduler to find the nearest wakeup time by looking at the first thread in the queue instead of searching the entire queue. o Removed file descriptor locking for select/poll routines. An application should not rely on the threads library for providing this locking; if necessary, the application should use mutexes to protect selecting/polling of file descriptors. o Retrieve and use the kernel clock rate/resolution at startup instead of hardcoding the clock resolution to 10 msec (tested with kernel running at 1000 HZ). o All queues have been changed to use queue.h macros. These include the queues of all threads, dead threads, and threads waiting for file descriptor locks. o Added reinitialization of the GC mutex and condition variable after a fork. Also prevented reallocation of the ready queue after a fork. o Prevented the wrapped close routine from closing the thread kernel pipes. o Initialized file descriptor table for stdio entries at thread init. o Provided additional flags to indicate to what queues threads belong. o Moved TAILQ initialization for statically allocated mutex and condition variables to after the spinlock. o Added dispatching of signals to pthread_kill. Removing the dispatching of signals from thread activation broke sigsuspend when pthread_kill was used to send a signal to a thread. o Temporarily set the state of a thread to PS_SUSPENDED when it is first created and placed in the list of threads so that it will not be accidentally scheduled before becoming a member of one of the scheduling queues. o Change the signal handler to queue signals to the thread kernel pipe if the scheduling queues are protected. When scheduling queues are unprotected, signals are then dequeued and handled. o Ensured that all installed signal handlers block the scheduling signal and that the scheduling signal handler blocks all other signals. This ensures that the signal handler is only interruptible for and by non-scheduling signals. An atomic lock is used to decide which instance of the signal handler will handle pending signals. o Removed _lock_thread_list and _unlock_thread_list as they are no longer used to protect the thread list. o Added missing RCS IDs to modified files. o Added checks for appropriate queue membership and activity when adding, removing, and searching the scheduling queues. These checks add very little overhead and are enabled when compiled with _PTHREADS_INVARIANTS defined. Suggested and implemented by Tor Egge with some modification by me. o Close a race condition in uthread_close. (Tor Egge) o Protect the scheduling queues while modifying them in pthread_cond_signal and _thread_fd_unlock. (Tor Egge) o Ensure that when a thread gets a mutex, the mutex is on that threads list of owned mutexes. (Tor Egge) o Set the kernel-in-scheduler flag in _thread_kern_sched_state and _thread_kern_sched_state_unlock to prevent a scheduling signal from calling the scheduler again. (Tor Egge) o Don't use TAILQ_FOREACH macro while searching the waiting queue for threads in a sigwait state, because a change of state destroys the TAILQ link. It is actually safe to do so, though, because once a sigwaiting thread is found, the loop ends and the function returns. (Tor Egge) o When dispatching signals to threads, make the thread inherit the signal deferral flag of the currently running thread. (Tor Egge) Submitted by: Daniel Eischen <eischen@vigrid.com> and Tor Egge <Tor.Egge@fast.no> Notes: svn path=/head/; revision=48046
* Added a missing comma to the static condition variable initialisationJohn Birrell1999-05-241-1/+1
| | | | | | | | | definition. Submitted by: David Leonard <David.Leonard@csee.uq.edu.au>, an OpenBSD guy. Notes: svn path=/head/; revision=47452
* Fix a problem with static initialisation of mutexes and conditionJohn Birrell1999-05-233-2/+40
| | | | | | | | | variables. Submitted by: Dan Eischen <eischen@vigrid.com> Notes: svn path=/head/; revision=47424
* Ensure that an existing thread gets it's state set to PS_DEAD toJohn Birrell1999-05-161-1/+7
| | | | | | | | | prevent being rescheduled. Submitted by: Dan Eischen <eischen@vigrid.com> Notes: svn path=/head/; revision=47244
* - Fixed bug where we NULL'd before we freed the data causing a memory leak.Nate Williams1999-05-141-1/+1
| | | | | | | | Submitted by: Ralf S. Engelschall Obtained from: PR i386/11713 Notes: svn path=/head/; revision=47206
* Back out patch for cond_timedwait() bug from -current, since other changesJason Evans1999-05-081-10/+1
| | | | | | | | | | have made the patch obsolete, as pointed out by Daniel Eischen <eischen@vigrid.com>. PR: bin/8872 Notes: svn path=/head/; revision=46680
* Apply patch included in bin/8872. This fixes a bug that occurs whenJason Evans1999-05-071-2/+11
| | | | | | | | | | | pthread_cond_timedwait() times out. PR: bin/8872 Submitted by: Jason Evans <jasone@canonware.com> Reviewed by: David Schwartz <davids@webmaster.com> Notes: svn path=/head/; revision=46628
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