lock Directory Reference

Files
	compat_mutex.c
	Portable wrapper for platform mutex implementations.
	compat_mutex.h
	Header for compat_mutex.c.
	compat_mutex_pthreads.c
	Implement the tor_mutex API using pthread_mutex_t.
	compat_mutex_winthreads.c
	Implement the tor_mutex API using CRITICAL_SECTION.