2001-06-25 Ross Johnson <rpj@setup1.ise.canberra.edu.au>

        * create.c (pthread_create): Add priority inheritance
        attributes.
        * mutex.c (pthread_mutex_lock): Remove some overhead for
        PTHREAD_MUTEX_NORMAL mutex types. Specifically, avoid
        calling pthread_self() and pthread_equal() to check/set
        the mutex owner. Introduce a new pseudo owner for this
        type. Test results suggest increases in speed of up to
        90% for non-blocking locks.
        This is the default type of mutex used internally by other
        synchronising objects, ie. condition variables and
        read-write locks. The test rwlock7.c shows about a
        30-35% speed increase over snapshot 2001-06-06. The
        price of this is that the application developer
        must ensure correct behaviour, or explicitly set the
        mutex to a safer type such as PTHREAD_MUTEX_ERRORCHECK.
        For example, PTHREAD_MUTEX_NORMAL (or PTHREAD_MUTEX_DEFAULT)
        type mutexes will not return an error if a thread which is not
        the owner calls pthread_mutex_unlock. The call will succeed
        in unlocking the mutex if it is currently locked, but a
        subsequent unlock by the true owner will then fail with EPERM.
        This is however consistent with some other implementations.
        (pthread_mutex_unlock): Likewise.
        (pthread_mutex_trylock): Likewise.
        (pthread_mutex_destroy): Likewise.
        * attr.c (pthread_attr_init): PTHREAD_EXPLICIT_SCHED is the
        default inheritance attribute; THREAD_PRIORITY_NORMAL is
        the default priority for new threads.
        * sched.c (pthread_attr_setschedpolicy): Added routine.
        (pthread_attr_getschedpolicy): Added routine.
        (pthread_attr_setinheritsched): Added routine.
        (pthread_attr_getinheritsched): Added routine.
        * pthread.h (sched_rr_set_interval): Added as a macro;
        returns -1 with errno set to ENOSYS.

2001-06-23  Ross Johnson  <rpj@setup1.ise.canberra.edu.au>

        *sched.c (pthread_attr_setschedparam): Add priority range
        check.
        (sched_setscheduler): New function; checks for a valid
        pid and policy; checks for permission to set information
        in the target process; expects pid to be a Win32 process ID,
        not a process handle; the only scheduler policy allowed is
        SCHED_OTHER.
        (sched_getscheduler): Likewise, but checks for permission
        to query.
        * pthread.h (SCHED_*): Moved to sched.h as defined in the
        POSIX standard.
        * sched.h (SCHED_*): Moved from pthread.h.
        (pid_t): Defined if necessary.
        (sched_setscheduler): Defined.
        (sched_getscheduler): Defined.
        * pthread.def (sched_setscheduler): Exported.
        (sched_getscheduler): Likewise.

2001-06-23  Ross Johnson  <rpj@setup1.ise.canberra.edu.au>

        Contributed by -  Ralf Brese <Ralf.Brese@pdb4.siemens.de>

        * create.c (pthread_create): Set thread priority from
        thread attributes.

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