[PING 2][RFC v3] Pretty printers for NPTL lock types

[Martin Galvan]

Changes in v3:
  * Rewrote the printers so that to_string will only return the type
name, and the attributes themselves will be returned using children().
  * Added a simple Iterator class for the children() method.
  * if/elif chain changed to dict lookup for mutex and mutexattr types.
  * Added docstrings according to the style guide.

Changes in v2:
  * Rewrote the printers so that to_string returns a string instead of
doing the actual printing.

--

Follow-up from https://sourceware.org/ml/libc-alpha/2015-03/msg00513.html .

This patch adds the pretty-printers for the following NPTL types:

- pthread_mutex_t
- pthread_mutexattr_t
- pthread_cond_t
- pthread_condattr_t
- pthread_rwlock_t
- pthread_rwlockattr_t

I've tested the printers on both the gdb CLI and Eclipse CDT. As this
is yet an RFC I didn't include things such as license/copyright
headers, changelogs, etc.

As always, any feedback is more than welcome. Thanks a lot!

-- 

Martin Galvan

Software Engineer

Taller Technologies Argentina

San Lorenzo 47, 3rd Floor, Office 5

Córdoba, Argentina

Phone: 54 351 4217888 / +54 351 4218211
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