2001-02-09 Ross Johnson <rpj@setup1.ise.canberra.edu.au>exp-2001-02-10-passed

        * nonportable.c (pthread_mutex_setdefaulttype_np): New
        function for changing the default mutex type.

        * mutex.c (ptw32_InitializeCriticalSection): Removed.
        (ptw32_InitializeCriticalSection): Removed.
        (ptw32_InitializeCriticalSection): Removed.
        (ptw32_InitializeCriticalSection): Removed.
        (ptw32_InitializeCriticalSection): Removed.
        (pthread_mutex_init): Apply Thomas Pfaff's original
        patches; remove use of critical sections and adapt
        for different mutex types (see log entry for 2001-01-10).
        The disadvantage of using critical sections is that
        they don't appear to be sharable between processes.
        This implementation provides the opportunity to place
        mutex objects in shared memory. Thread priority
        determines the order in which waiting threads acquire
        the mutex although the implementation includes a
        mechanism to prevent threads hogging the mutex through
        successive unlock/lock operations.
        (pthread_mutex_destroy): Likewise.
        (pthread_mutex_lock): Likewise.
        (pthread_mutex_unlock): Likewise.
        (pthread_mutex_trylock): Likewise.

        * pthread.h (rand_r): Add redundant test of '_seed' arg
        to avoid "unused variable" warnings. Any good compiler
        will optimise the test away anyway.

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