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2001-07-18Fix potential NULL pointer dereferences.rpj
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.
2001-07-11Fixed cast; tests passed.rpj
2001-07-10Untested revamp of barrier.c.rpj
* 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.
2001-07-09 * barrier.c: Revamped to fix the race condition. Two alternatingrpj
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.
2001-07-08Barriers fixed and tested more extensively.rpj
* 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.
2001-07-06Spinlocks and barriers fixed and working. Beta level.rpj
* 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.
2001-07-05Fixups to last commit.rpj
2001-07-05 * barrier.c: Remove static initialisation - irreleventrpj
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.
2001-07-05Added new routines from POSIX 1003.1j. This is alpha level code.rpj
* 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.