Clarified HWM=0 means infinite
Update PGM with recent changes
Merge pull request #532 from hurtonm/pgm_build_fix

Update PGM with recent changes
Work around for LIBZMQ-496

The problem is that other threads might still be in mailbox::send() when
it is destroyed. So as a workaround, we just acquire the mutex in the
destructor. Therefore the running send will finish before the mailbox is
destroyed.

See also the fix for LIBZMQ-281 in zeromq2-x.

Signed-off-by: Mika Fischer <mika.fischer@zoopnet.de>
Merge pull request #533 from mika-fischer/workaround-for-496

Work around for LIBZMQ-496
Added corporate copyrights
On the Tile architecture, use atomic instructions for atomic ptr and counter.

For atomic_counter and atomic_ptr classes, detect the Tile architecture
using #if defined __tile__ matching ARM and Solaris and then use the
Tile atomic instructions. Without this change, the default Mutex
implementation is used, which is slower.
Merge pull request #535 from ken-tilera/master

Optimize atomics implementaiton for the Tile architecture
Merge pull request #534 from hintjens/master

Reverted cleanups of copyrghts