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* Add $Id$, to make it simpler for members of the translation teams tonik1999-07-1223-0/+46
| | | | | | | | | | | | | | | | | track. The $Id$ line is normally at the bottom of the main comment block in the man page, separated from the rest of the manpage by an empty comment, like so; .\" $Id$ .\" If the immediately preceding comment is a @(#) format ID marker than the the $Id$ will line up underneath it with no intervening blank lines. Otherwise, an additional blank line is inserted. Approved by: bde
* Use USRSTACK (defined in <machine/vmparam.h>) to get top of the initial stack.dt1999-07-122-16/+6
| | | | PTHREAD_STACK_TOP was wrong for all supported architectures.
* Fix a couple more coding style nits.jasone1999-07-112-5/+5
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* Modify previous changes to conform better to libc_r's coding style.jasone1999-07-114-76/+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.
* Always use growable thread stacks on the i386. The VM_STACK kernel optionjasone1999-07-065-31/+18
| | | | | must be made default for the alpha before growable thread stacks are enabled for the alpha.
* Disable growable stacks by default, as advertised.jasone1999-07-051-2/+2
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* Use growable stacks for thread stacks that are the default stack size.jasone1999-07-055-22/+164
| | | | | | | | | | | | | 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.
* Defer signals, so we will not wait for SIGCHLD after it was delivered.dt1999-06-291-0/+5
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* Fix few warnings on the alpha.dt1999-06-232-3/+4
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* Remove -DNOPOLL from the compilation flags now that there is a poll wrapperjb1999-06-201-4/+4
| | | | | | | in libc_r. Bump the library version number (the scheduler now uses a poll syscall instead of select).
* In the words of the author:jb1999-06-2025-1440/+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>
* Added a missing comma to the static condition variable initialisationjb1999-05-241-1/+1
| | | | | | definition. Submitted by: David Leonard <David.Leonard@csee.uq.edu.au>, an OpenBSD guy.
* Fix a problem with static initialisation of mutexes and conditionjb1999-05-233-2/+40
| | | | | | variables. Submitted by: Dan Eischen <eischen@vigrid.com>
* Ensure that an existing thread gets it's state set to PS_DEAD tojb1999-05-161-1/+7
| | | | | | prevent being rescheduled. Submitted by: Dan Eischen <eischen@vigrid.com>
* - Fixed bug where we NULL'd before we freed the data causing a memory leak.nate1999-05-141-1/+1
| | | | | Submitted by: Ralf S. Engelschall Obtained from: PR i386/11713
* Removed extraneous comma in xrefs.alex1999-05-142-4/+4
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* Added missing comma in xrefs.alex1999-05-141-2/+2
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* Add mutex test program.jb1999-05-091-2/+2
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* Back out patch for cond_timedwait() bug from -current, since other changesjasone1999-05-081-10/+1
| | | | | | | have made the patch obsolete, as pointed out by Daniel Eischen <eischen@vigrid.com>. PR: bin/8872
* Apply patch included in bin/8872. This fixes a bug that occurs whenjasone1999-05-071-2/+11
| | | | | | | | pthread_cond_timedwait() times out. PR: bin/8872 Submitted by: Jason Evans <jasone@canonware.com> Reviewed by: David Schwartz <davids@webmaster.com>
* [ The author's description... ]jb1999-03-2338-668/+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.
* Typo fix (set --> get).alex1999-03-221-3/+3
| | | | Obtained from: OpenBSD (David Leonard)
* Fixed bitrot in synopsis (some const poisoning hadn't reached here).bde1999-03-051-2/+2
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* Increase the size of private thread flags so that the test for ajb1999-01-151-1/+1
| | | | | | | thread trying to call pthread_exit() from a cleanup handler actually works. Submitted by: David Leonard <david.leonard@csee.uq.edu.au> OpenBSD
* Fix a minor security problem in libc_r.imp1999-01-111-4/+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
* Don't hide mknod, it doesn't need a wrapper and never has had one.jb1998-12-101-2/+2
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* Add support for pthread_mutexattr_settype(). As a side effect ofeivind1998-11-282-20/+61
| | | | testing this, fix MUTEX_TYPE_COUNTING_FAST. Recursive locks now work.
* Interrupt threads waiting in select etc.jb1998-11-151-0/+20
| | | | Submitted by: Alec Wolman <wolman@cs.washington.edu>
* Close a window between unlocking a spinlock and changing the thread state.jb1998-11-154-21/+31
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* Don't call pthread_mutex_lock with _SPINLOCK held.dt1998-11-061-21/+30
| | | | | | Made pthread_cond_wait() more similar to pthread_cond_timedwait(). PR: 8375
* Fix some bugs in pthread scheduler:dt1998-10-092-6/+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>
* Debug when an environment variable set, no when it is unset.dt1998-09-301-2/+2
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* Revise test code for sigwait and add test code for sigsuspend.jb1998-09-301-2/+2
| | | | Submitted by: Daniel M. Eischen <eischen@vigrid.com>
* Cosmetic cleansing. This code requires extra work to keep the garbagejb1998-09-301-2/+3
| | | | collector thread running after a fork.
* Move the cleanup code that frees memory allocated for a dead thread fromjb1998-09-307-130/+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.
* Use snprintf instead of sprintf to avoid long source file paths fromjb1998-09-301-12/+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.
* Implementation of an additional state called SIGWAIT (with the previousjb1998-09-304-68/+116
| | | | | | one renamed to SIGSUSPEND) to fix sigwait(). Submitted by: Daniel M. Eischen <eischen@vigrid.com>
* NULL a pointer after it is freed to avoid trying to free it again.jb1998-09-301-0/+2
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* - Fix the debug macros.jb1998-09-301-4/+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.
* Change to a code sequence which is more likely to work on SMP systems.dfr1998-09-161-20/+8
| | | | Now all I need is an alpha SMP box to port FreeBSD to :-)
* In libc_r, rename vfork syscall to _thread_sys_vfork and make vfork an aliasdt1998-09-122-1/+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.
* Removed unused variables.alex1998-09-076-11/+2
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* Removed some variable initializations which were unnecessary and divergentalex1998-09-071-6/+6
| | | | from style(9).
* -Wall clean.alex1998-09-072-2/+5
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* Implement pthread read/write locks as defined by Version 2 of the Singlealex1998-09-0714-2/+1238
| | | | | | | UNIX Specification. As with our standard mutexes, process shared locks are not supported at this time.
* Sort cross references.wosch1998-08-3112-33/+33
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* Don't automatically restart syscalls for the signals that the threadjb1998-08-261-1/+1
| | | | kernel needs.
* Back out most of the last commit. It created problems with sigpause.jb1998-08-261-26/+1
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* Add support for building test programs.jb1998-08-251-0/+8
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* Fix for sigwait problem.jb1998-08-253-17/+99
| | | | | Submitted by: Daniel M. Eischen <eischen@vigrid.com> PR: misc/7039
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