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* 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 Wemm1999-08-2878-78/+78
| | | | 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
* 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 Eischen1999-08-0567-74/+119
| | | | | | | | | | 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 Eischen1999-08-052-11/+15
| | | | | | | | | | 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 Birrell1999-06-2025-1440/+1851
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 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
* [ The author's description... ]John Birrell1999-03-2338-668/+3166
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | o Runnable threads are now maintained in priority queues. The implementation requires two things: 1.) The priority queues must be protected during insertion and removal of threads. Since the kernel scheduler must modify the priority queues, a spinlock for protection cannot be used. The functions _thread_kern_sched_defer() and _thread_kern_sched_undefer() were added to {un}defer kernel scheduler activation. 2.) A thread (active) priority change can be performed only when the thread is removed from the priority queue. The implementation uses a threads active priority when inserting it into the queue. A by-product is that thread switches are much faster. A separate queue is used for waiting and/or blocked threads, and it is searched at most 2 times in the kernel scheduler when there are active threads. It should be possible to reduce this to once by combining polling of threads waiting on I/O with the loop that looks for timed out threads and the minimum timeout value. o Functions to defer kernel scheduler activation were added. These are _thread_kern_sched_defer() and _thread_kern_sched_undefer() and may be called recursively. These routines do not block the scheduling signal, but latch its occurrence. The signal handler will not call the kernel scheduler when the running thread has deferred scheduling, but it will be called when running thread undefers scheduling. o Added support for _POSIX_THREAD_PRIORITY_SCHEDULING. All the POSIX routines required by this should now be implemented. One note, SCHED_OTHER, SCHED_FIFO, and SCHED_RR are required to be defined by including pthread.h. These defines are currently in sched.h. I modified pthread.h to include sched.h but don't know if this is the proper thing to do. o Added support for priority protection and inheritence mutexes. This allows definition of _POSIX_THREAD_PRIO_PROTECT and _POSIX_THREAD_PRIO_INHERIT. o Added additional error checks required by POSIX for mutexes and condition variables. o Provided a wrapper for sigpending which is marked as a hidden syscall. o Added a non-portable function as a debugging aid to allow an application to monitor thread context switches. An application can install a routine that gets called everytime a thread (explicitly created by the application) gets context switched. The routine gets passed the pthread IDs of the threads that are being switched in and out. Submitted by: Dan Eischen <eischen@vigrid.com> Changes by me: o Added a PS_SPINBLOCK state to deal with the priority inversion problem most often (I think) seen by threads calling malloc/free/realloc. o Dispatch signals to the running thread directly rather than at a context switch to avoid the situation where the switch never occurs. Notes: svn path=/head/; revision=44963
* Increase the size of private thread flags so that the test for aJohn Birrell1999-01-151-1/+1
| | | | | | | | | | thread trying to call pthread_exit() from a cleanup handler actually works. Submitted by: David Leonard <david.leonard@csee.uq.edu.au> OpenBSD Notes: svn path=/head/; revision=42681
* Fix a minor security problem in libc_r.Warner Losh1999-01-111-4/+25
| | | | | | | | | Submitted by: Alexandre Snarskii <snar@paranoia.ru> Approved by: John Birrell Reminded me that I'd been sitting on this too long: snar@paranoia.ru Notes: svn path=/head/; revision=42500
* Add support for pthread_mutexattr_settype(). As a side effect ofEivind Eklund1998-11-282-20/+61
| | | | | | | testing this, fix MUTEX_TYPE_COUNTING_FAST. Recursive locks now work. Notes: svn path=/head/; revision=41390
* Interrupt threads waiting in select etc.John Birrell1998-11-151-0/+20
| | | | | | | Submitted by: Alec Wolman <wolman@cs.washington.edu> Notes: svn path=/head/; revision=41165
* Close a window between unlocking a spinlock and changing the thread state.John Birrell1998-11-154-21/+31
| | | | Notes: svn path=/head/; revision=41164
* Don't call pthread_mutex_lock with _SPINLOCK held.Dmitrij Tejblum1998-11-061-21/+30
| | | | | | | | | Made pthread_cond_wait() more similar to pthread_cond_timedwait(). PR: 8375 Notes: svn path=/head/; revision=40974
* Fix some bugs in pthread scheduler:Dmitrij Tejblum1998-10-092-6/+12
| | | | | | | | | | | make pthread_yield() more reliable, threads always (I hope) preempted at least every 0.1 sec, as intended. PR: bin/7744 Submitted by: "Richard Seaman, Jr." <dick@tar.com> Notes: svn path=/head/; revision=40127
* Debug when an environment variable set, no when it is unset.Dmitrij Tejblum1998-09-301-2/+2
| | | | Notes: svn path=/head/; revision=39826
* Cosmetic cleansing. This code requires extra work to keep the garbageJohn Birrell1998-09-301-2/+3
| | | | | | | collector thread running after a fork. Notes: svn path=/head/; revision=39808
* Move the cleanup code that frees memory allocated for a dead thread fromJohn Birrell1998-09-307-130/+324
| | | | | | | | | | | | | | | | | the thread kernel into a garbage collector thread which is started when the fisrt thread is created (other than the initial thread). This removes the window of opportunity where a context switch will cause a thread that has locked the malloc spinlock, to enter the thread kernel, find there is a dead thread and try to free memory, therefore trying to lock the malloc spinlock against itself. The garbage collector thread acts just like any other thread, so instead of having a spinlock to control accesses to the dead thread list, it uses a mutex and a condition variable so that it can happily wait to be signalled when a thread exists. Notes: svn path=/head/; revision=39807
* Use snprintf instead of sprintf to avoid long source file paths fromJohn Birrell1998-09-301-12/+31
| | | | | | | | | | launching an application into space when someone tries to debug it. The dead thread list now has it's own link pointer, so use that when reporting the grateful dead. Notes: svn path=/head/; revision=39806
* Implementation of an additional state called SIGWAIT (with the previousJohn Birrell1998-09-304-68/+116
| | | | | | | | | one renamed to SIGSUSPEND) to fix sigwait(). Submitted by: Daniel M. Eischen <eischen@vigrid.com> Notes: svn path=/head/; revision=39805
* NULL a pointer after it is freed to avoid trying to free it again.John Birrell1998-09-301-0/+2
| | | | Notes: svn path=/head/; revision=39804
* - Fix the debug macros.John Birrell1998-09-301-4/+21
| | | | | | | | | | | | | | - Add support of a thread being listed in the dead thread list as well as the thread list. - Add a new thread state to make sigwait work properly. (Submitted by Daniel M. Eischen <eischen@vigrid.com>) - Add global variable for the garbage collector mutex and condition variable. - Delete a couple of prototypes that are no longer required. - Add a prototype for the garbage collector thread. Notes: svn path=/head/; revision=39803
* In libc_r, rename vfork syscall to _thread_sys_vfork and make vfork an aliasDmitrij Tejblum1998-09-122-1/+11
| | | | | | | | | | to fork. It is difficult to do real vfork in libc_r, since almost every operation with file descriptsor changes _thread_fd_table and friends. popen(3) works much better with this change. Notes: svn path=/head/; revision=39118
* Removed unused variables.Alexander Langer1998-09-076-11/+2
| | | | Notes: svn path=/head/; revision=38925
* Removed some variable initializations which were unnecessary and divergentAlexander Langer1998-09-071-6/+6
| | | | | | | from style(9). Notes: svn path=/head/; revision=38923
* -Wall clean.Alexander Langer1998-09-072-2/+5
| | | | Notes: svn path=/head/; revision=38921
* Implement pthread read/write locks as defined by Version 2 of the SingleAlexander Langer1998-09-074-1/+445
| | | | | | | | | | UNIX Specification. As with our standard mutexes, process shared locks are not supported at this time. Notes: svn path=/head/; revision=38919
* Don't automatically restart syscalls for the signals that the threadJohn Birrell1998-08-261-1/+1
| | | | | | | kernel needs. Notes: svn path=/head/; revision=38564
* Back out most of the last commit. It created problems with sigpause.John Birrell1998-08-261-26/+1
| | | | Notes: svn path=/head/; revision=38563
* Fix for sigwait problem.John Birrell1998-08-253-17/+99
| | | | | | | | Submitted by: Daniel M. Eischen <eischen@vigrid.com> PR: misc/7039 Notes: svn path=/head/; revision=38539
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