* posix-threads.cc (_Jv_CondWait): Use _Jv_PthreadGetMutex.
	* include/posix-threads.h (_Jv_Mutex_t): Define as structure,
	except on Linux.
	(_Jv_PthreadGetMutex): New function.
	(_Jv_PthreadCheckMonitor): Use it.
	(_Jv_MutexInit): Likewise.  ALso, initialize `count'.
	(_Jv_MutexLock): Update `count'.
	(_Jv_MutexUnlock): Likewise.
	(_Jv_PthreadCheckMonitor): Use Linux-specific knowledge when
	appropriate.

From-SVN: r29032