one question on mutex.

[satish kondapalli]

I declared one test mutex  in my char module:
struct mtx test_mutex;

Initialized the above mutex while module loading:
mtx_init(&test_mutex,"cdev_test_mutex",NULL,MTX_DEF);

and in charter device open() function I called mtx_lock() twice. 
mtx_lock(&test_mutex);
mtx_lock(&test_mutex);

Here my question is why the kernel is not blocking on second call of
mtx_lock() ?
Here i initilaized my mutex type as MTX_DEF. All default MTX_DEF are
recursive? (then what is MTX_RECURSE ).


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