Added errorcheck mutexes. These are activated through the preprocessor

Added errorcheck mutexes. These are activated through the preprocessor

2000-09-29  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

	* configure.in, glib.h: Added errorcheck mutexes. These are
	activated through the preprocessor symbol
	G_ERRORCHECK_MUTEXES. Need to add an extra word to StaticMutex in
	order to achieve this. g_(static_)mutex_* functions instrument the
	mutex operations with mutex name and location, when compiled with
	-DG_ERRORCHECK_MUTEXES. g_thread_init activates the errorcheck
	mutexes, when compiled with -DG_ERRORCHECK_MUTEXES.

	* gthread/gthread-impl.c: Added errorcheck mutexes. New
        exported function
        g_thread_init_with_errorcheck_mutexes, which is called instead of
	g_thread_init, when compiled with -DG_ERRORCHECK_MUTEXES. New
	static functions
	g_mutex_(new|lock|trylock|unlock|free)_errorcheck_impl to
	implement errorcheck mutexes.

	* gthread/gthread-posix.impl.c, gthread/gthread-solaris-impl.c:
        Define the size of a mutex.