1998-10-05 Ben Elliston <bje@cygnus.com>

	* global.c (PTHREAD_MUTEX_INITIALIZER): Move to pthread.h.
	* pthread.h (PTHREAD_MUTEX_INITIALIZER): Define.
	(pthread_mutex_t): Reimplement as a struct containing a valid
	flag. If the flag is ever down upon entry to a mutex operation,
	we call pthread_mutex_create() to initialise the object. This
	fixes the problem of how to handle statically initialised objects
	that can't call InitializeCriticalSection() due to their context.
	* mutex.c (pthread_mutex_init): Set valid flag.
	(pthread_mutex_destroy): Clear valid flag.
	(pthread_mutex_lock): Check and handle the valid flag.
	(pthread_mutex_unlock): Likewise.
	(pthread_mutex_trylock): Likewise.
	* tests/mutex3.c: New file; test for the static initialisation
	macro. Passes.

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