Revamped errorcheck mutexes and added errorcheck cond_wait() and

Revamped errorcheck mutexes and added errorcheck cond_wait() and

2000-11-28  Sebastian Wilhelmi  <wilhelmi@ira.uka.de>

	* gthread-impl.c: Revamped errorcheck mutexes and added errorcheck
	cond_wait() and cond_timed_wait() funtions. This makes he whole
	thing work. Now we only show the location of the locking/unlocking
	for -DG_ERRORCHECK_MUTEXES and not the name of the mutex.

	* gthread.c: Set the thread data before locking the mutex, because
	the locking call might use g_thread_self ().

	* gthread.h: Do only show the location of the locking/unlocking
	for -DG_ERRORCHECK_MUTEXES and not the name of the mutex. Add the
	errorcheck capability for g_cond_wait and g_cond_timed_wait as
	well.