Cleanup common POSIX functionality.

Cleanup common POSIX functionality.

The Mutex implementation is the same for all 6 POSIX platformats, just
like of them use the sched_yield() to implement Thread::YieldCPU().

R=dslomov@chromium.org

Committed: https://code.google.com/p/v8/source/detail?r=15623

[Dmitry Lomov (no reviews), 2013-07-11 10:52:15]

lgtm

https://codereview.chromium.org/18335008/diff/2001/src/platform-macos.cc
File src/platform-macos.cc (left):

https://codereview.chromium.org/18335008/diff/2001/src/platform-macos.cc#oldc...
src/platform-macos.cc:666: pthread_mutex_init(&mutex_, &attr);
Hmm MacOS mutex did not have pthread_mutexattr_destroy before, but it should be
fine.

[Benedikt Meurer, 2013-07-11 10:58:45]

https://codereview.chromium.org/18335008/diff/2001/src/platform-macos.cc
File src/platform-macos.cc (left):

https://codereview.chromium.org/18335008/diff/2001/src/platform-macos.cc#oldc...
src/platform-macos.cc:666: pthread_mutex_init(&mutex_, &attr);
On 2013/07/11 10:52:16, Dmitry Lomov (chromium) wrote:
> Hmm MacOS mutex did not have pthread_mutexattr_destroy before, but it should
be
> fine.

Yeah, it's currently a no-op on OS X, but that might change in the future, so we
should do proper cleanup.

[Benedikt Meurer, 2013-07-11 11:37:15]

Committed patchset #2 manually as r15623 (presubmit successful).