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* 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
* Add extra initialisation code that is required for processes thatjb1998-08-101-1/+29
| | | | | | | are started instead of init (pid = 1). This allows an embedded implementation quite like VxWorks, with (possibly) a single threaded program running instead of init. The neat thing is that the same threaded process can run in a multi-user workstation environment too.
* Changed prototype in synopsis to match prototype in <pthread.h>.bde1998-08-033-3/+3
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* The pthreads standard has been published. Change:alex1998-08-0324-47/+47
| | | | | | | | | | ...is expected to conform to IEEE (``POSIX'') Std 1003.1c when it is published. to: ...conforms to ISO/IEC 9945-1 ANSI/IEEE (``POSIX'') Std 1003.1 Second Edition 1996-07-12. Discussed with: jb
* A style fix for my previous commit.alex1998-08-021-1/+1
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* Fixed a race condition during the first lock/trylock of a staticallyalex1998-08-021-4/+21
| | | | | | | | | initialized mutex. Statically initialized mutexes are actually initialized at first use (pthread_mutex_lock/pthread_mutex_trylock). To prevent concurrent initialization by multiple threads, all static initializations are now serialized by a spinlock. Reviewed by: jb
* I've put together man pages for the pthread_cleanup, pthread_cond, andphk1998-07-3115-2/+951
| | | | | | | | pthread_mutex routines. I've also tweaked pthread_create.3 to point to pthread_cleanup_push(3) and pthread_cleanup_pop(3). PR: 7450 Submitted by: Brian Cully <shmit@kublai.com>
* Fixed a printf format error. Didn't fix assumption that sigset_t isbde1998-06-301-1/+1
| | | | integral.
* Add the missing {} that caused the function to return ESRCH if itjb1998-06-251-1/+2
| | | | | had to wait for the thread to exit and if the caller didn't want the thread exit status.
* Don't allow a SIGCHLD to wake up a thread if the process has the defaultjb1998-06-171-6/+9
| | | | | signal handler installed for SIGCHLD. The ACE MT_SOCK_Test was hanging as the result of being interrupted when it didn't expect to be.
* If a thread is waiting on a child process to complete, the SIGCHLDjb1998-06-171-1/+20
| | | | | | signal can arrive before the thread is woken from it's wait4. In this case, don't return an EINTR, just set the thread state to running and the wait4 wrapper will loop and get the exit status of the process.
* Don't compile in the use of poll() when building libc_r. This isn'tpeter1998-06-141-2/+2
| | | | | so much a "fix", rather a bandaid to buy time to fix it properly within the thread engine.
* If a short write, only loop if no error.jb1998-06-142-4/+4
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* Add poll to the list of hidden syscalls so that it gets renamed. Thisjb1998-06-121-2/+2
| | | | | | | | | | | propagates a bug (that there is no poll wrapper in libc_r), but it prevents GNU configure scripts from trying to use it in preference to select. libc_r really needs to change it's wait interface to use poll instead of select because poll is more a superset of select that the other way around. This should allow the Roxen web server to work out-of-the-box. It's configuration intercae is kinda neat. The code isn't. Shiver. 8-)
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