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Contributed by - "Scott McCaskill" <scott@magruder.org>
* mutex.c (pthread_mutexattr_init): Return ENOMEM
immediately and don't dereference the NULL pointer
if calloc fails.
(pthread_mutexattr_getpshared): Don't dereference
a pointer that is possibly NULL.
* barrier.c (pthread_barrierattr_init): Likewise
(pthread_barrierattr_getpshared): Don't dereference
a pointer that is possibly NULL.
* condvar.c (pthread_condattr_getpshared): Don't dereference
a pointer that is possibly NULL.
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* barrier.c: Still more revamping. The exclusive access
mutex isn't really needed so it has been removed and replaced
by an InterlockedDecrement(). nSerial has been removed.
iStep is now dual-purpose. The process shared attribute
is now stored in the barrier struct.
* implement.h (pthread_barrier_t_): Lost some/gained one
elements.
* private.c (ptw32_threadStart): Removed some comments.
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semaphores are used instead of the PulseEvent. Also improved
overall throughput by returning PTHREAD_BARRIER_SERIAL_THREAD
to the first waking thread.
* implement.h (pthread_barrier_t_): Revamped.
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* barrier.c: Fix several bugs in all routines. Now passes
tests/barrier5.c which is fairly rigorous. There is still
a non-optimal work-around for a race condition between
the barrier breeched event signal and event wait. Basically
the last (signalling) thread to hit the barrier yields
to allow any other threads, which may have lost the race,
to complete.
tests/ChangeLog:
* barrier3.c: Fixed.
* barrier4.c: Fixed.
* barrier5.c: New; proves that all threads in the group
reaching the barrier wait and then resume together. Repeats
the test using groups of 1 to 16 threads. Each group of
threads must negotiate a large number of barriers (10000).
* spin4.c: Fixed.
* test.h (error_string): Modified the success (0) value.
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* spin.c: Revamped and working; included static initialiser.
* barrier.c: Likewise.
* condvar.c: Macro constant change; inline auto init routine.
* mutex.c: Likewise.
* rwlock.c: Likewise.
* private.c: Add support for spinlock initialiser.
* global.c: Likewise.
* implement.h: Likewise.
* pthread.h (PTHREAD_SPINLOCK_INITIALIZER): Fix typo.
tests/ChangeLog:
* spin3.c: Changed test and fixed.
* spin4.c: Fixed.
* barrier3.c: Fixed.
* barrier4.c: Fixed.
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for this object.
* pthread.h (PTHREAD_BARRIER_INITIALIZER): Removed.
* rwlock.c (pthread_rwlock_wrlock): This routine is
not a cancelation point - disable deferred
cancelation around call to pthread_cond_wait().
tests/ChangeLog:
* spin1.c: New; testing spinlocks.
* spin2.c: New; testing spinlocks.
* spin3.c: New; testing spinlocks.
* spin4.c: New; testing spinlocks.
* barrier1.c: New; testing barriers.
* barrier2.c: New; testing barriers.
* barrier3.c: New; testing barriers.
* barrier4.c: New; testing barriers.
* GNUmakefile: Add new tests.
* Makefile: Add new tests.
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* spin.c: New module implementing spin locks.
* barrier.c: New module implementing barriers.
* pthread.h (_POSIX_SPIN_LOCKS): defined.
(_POSIX_BARRIERS): Defined.
(pthread_spin_*): Defined.
(pthread_barrier*): Defined.
(PTHREAD_BARRIER_SERIAL_THREAD): Defined.
* implement.h (pthread_spinlock_t_): Defined.
(pthread_barrier_t_): Defined.
(pthread_barrierattr_t_): Defined.
* mutex.c (pthread_mutex_lock): Return with the error
if an auto-initialiser initialisation fails.
* nonportable.c (pthread_getprocessors_np): New; gets the
number of available processors for the current process.
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