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* 1. Don't override underscore version of aio_suspend(), system(),davidxu2006-07-251-60/+45
| | | | | | | | | | wait(), waitpid() and usleep(), they are internal versions and should not be cancellation points. 2. Make wait3() as a cancellation point. 3. Move raise() and pause() into file thr_sig.c. 4. Add functions _sigsuspend, _sigwait, _sigtimedwait and _sigwaitinfo, remove SIGCANCEL bit in wait-set for those functions, the signal is used internally to implement thread cancellation.
* WARNS level 4 cleanup.davidxu2006-04-041-11/+65
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* Remove a redundant _get_curthread() call.davidxu2005-11-021-1/+0
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* In raise(), use a shortcut to directly send signal to current thread.davidxu2005-11-021-7/+2
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* Add a cancellation point for usleep().deischen2005-08-031-0/+19
| | | | | While here, fix sleep() so that it is also a cancellation point (a missing weak reference prevented that).
* Import my recent 1:1 threading working. some features improved includes:davidxu2005-04-021-403/+216
| | | | | | | | | | | | | | | | 1. fast simple type mutex. 2. __thread tls works. 3. asynchronous cancellation works ( using signal ). 4. thread synchronization is fully based on umtx, mainly, condition variable and other synchronization objects were rewritten by using umtx directly. those objects can be shared between processes via shared memory, it has to change ABI which does not happen yet. 5. default stack size is increased to 1M on 32 bits platform, 2M for 64 bits platform. As the result, some mysql super-smack benchmarks show performance is improved massivly. Okayed by: jeff, mtm, rwatson, scottl
* Implement cancellation points in libc interfaces, as specified by POSIX.mtm2004-09-161-0/+293
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* Implement pthread_atfork in libthr. This is mostly from deichen'smtm2004-06-271-0/+58
| | | | | | work in libpthread. Submitted by: Dan Nelson <dnelson@allantgroup.com>
* Make libthr async-signal-safe without costly signal masking. The guidlines Imtm2004-05-201-55/+0
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | followed are: Only 3 functions (pthread_cancel, pthread_setcancelstate, pthread_setcanceltype) are required to be async-signal-safe by POSIX. None of the rest of the pthread api is required to be async-signal-safe. This means that only the three mentioned functions are safe to use from inside signal handlers. However, there are certain system/libc calls that are cancellation points that a caller may call from within a signal handler, and since they are cancellation points calls have to be made into libthr to test for cancellation and exit the thread if necessary. So, the cancellation test and thread exit code paths must be async-signal-safe as well. A summary of the changes follows: o Almost all of the code paths that masked signals, as well as locking the pthread structure now lock only the pthread structure. o Signals are masked (and left that way) as soon as a thread enters pthread_exit(). o The active and dead threads locks now explicitly require that signals are masked. o Access to the isdead field of the pthread structure is protected by both the active and dead list locks for writing. Either one is sufficient for reading. o The thread state and type fields have been combined into one three-state switch to make it easier to read without requiring a lock. It doesn't need a lock for writing (and therefore for reading either) because only the current thread can write to it and it is an integer value. o The thread state field of the pthread structure has been eliminated. It was an unnecessary field that mostly duplicated the flags field, but required additional locking that would make a lot more code paths require signal masking. Any truly unique values (such as PS_DEAD) have been reborn as separate members of the pthread structure. o Since the mutex and condvar pthread functions are not async-signal-safe there is no need to muck about with the wait queues when handling a signal ... o ... which also removes the need for wrapping signal handlers and sigaction(2). o The condvar and mutex async-cancellation code had to be revised as a result of some of these changes, which resulted in semi-unrelated changes which would have been difficult to work on as a separate commit, so they are included as well. The only part of the changes I am worried about is related to locking for the pthread joining fields. But, I will take a closer look at them once this mega-patch is committed.
* o Since we're not using signals for thread synchronization anymore,mtm2004-03-271-4/+17
| | | | | | | | sigprocmask no longer needs to be wrapped. o raise(3) is applied to the calling thread in a threaded program. o In the sigaction wrapper reference the correct structure. o Don't treat SIGTHR especially anymore (infact it won't exist in a little while).
* o Add a wrapper around sigaction(2), so we can insert our own wrappermtm2003-12-091-0/+58
| | | | | around signals. o Lock the process global signal action table.
* Enable cancellation points around some syscalls.mtm2003-12-091-28/+28
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* Make WARNS2 clean. The fixes mostly included:mtm2003-05-231-0/+10
| | | | | | | | o removed unused variables o explicit inclusion of header files o prototypes for externally defined functions Approved by: re/blanket libthr
* - Add libthr but don't hook it up to the regular build yet. This is anjeff2003-04-011-0/+418
adaptation of libc_r for the thr system call interface. This is beta quality code.
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