Bump the libpthread(3) minor number to 4

Added C11 Threading library support.

Add a todo item for a future major bump (rename many symbols)

bump

bump for pthread_cond_setclock

Implement sem_timedwait.

merge christos-time_t

Some things to do on major bump.

- Fix pthread_rwlock_trywrlock() which was broken.

- Add new functions: pthread_mutex_held_np, mutex_owner_np, rwlock_held_np,
rwlock_wrheld_np, rwlock_rdheld_np. These match the kernel's locking

- Fix pthread_rwlock_trywrlock() which was broken.

- Add new functions: pthread_mutex_held_np, mutex_owner_np, rwlock_held_np,
rwlock_wrheld_np, rwlock_rdheld_np. These match the kernel's locking
primitives and can be used when porting kernel code to userspace.

- Always create LWPs detached. Do join/exit sync mostly in userland. When
looped on a dual core box this seems ~30% quicker than using lwp_wait().
Reduce number of lock acquire/release ops during thread exit.

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Bump libc/libpthread minor for thr_curcpu()/pthread_curcpu_np().

Crank libpthread to 0.8. It now uses _lwp_ctl(), and it's handy to keep
0.7 hanging around for old kernels.

Bump libpthread & libpthread_dbg minor versions so that an old SA copy
gets kept in the file system. Requested by pavel.

Interpose cancellation points in pollts() and pselect(), bringing us
to libc.so.12.127 and libpthread.so.0.6.

bump the version of this too.

- libc.so.12.109 and libpthread.so.0.4
- add ssize_t stackinfo_offset argument to sa_register syscall
- remove sa_unblockyield syscall
- make __sigprocmask14 syscall weak
- in pthread__sa_start: catc

- libc.so.12.109 and libpthread.so.0.4
- add ssize_t stackinfo_offset argument to sa_register syscall
- remove sa_unblockyield syscall
- make __sigprocmask14 syscall weak
- in pthread__sa_start: catch up with 4-argument sa_register syscall

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Bump libc to 12.107 and libpthread to 0.3 for fsync_range(2).

Add support for naming a thread, using an API compatible with Tru64 Unix:
* pthread_attr_getname_np()
* pthread_attr_setname_np()
* pthread_getname_np()
* pthread_setname_np()

In addition to being q

Add support for naming a thread, using an API compatible with Tru64 Unix:
* pthread_attr_getname_np()
* pthread_attr_setname_np()
* pthread_getname_np()
* pthread_setname_np()

In addition to being query'able by the application (for log messages, etc.),
it is intended that these names can show up in the debugger.

Reviewed by nathanw.

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add support for p1003.1b semaphores. From FreeBSD

Merge the nathanw_sa branch.