pthreads: Reimplement pthread types using non polluting types.

Use __ implementation specific namespace and adjust libthread_xu.
* The pthread_addr_t type was specific only to libc_r, remove it.

pthreads: Reimplement pthread types using non polluting types.

Use __ implementation specific namespace and adjust libthread_xu.
* The pthread_addr_t type was specific only to libc_r, remove it.
* The pthread_startroutine_t typedef was never used since initial fork.
* The mutex member in struct pthread_once was for libc_r only, rename
it to __sparelibc_r void pointer to keep ABI compatibility.
* Mangle struct names using __type_s scheme to avoid collisions with
user defined types in 3rd-party software packages.
* Adjust partly publicly visible struct pthread_once members too.

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pthreads: Use pthread_t type in libthread_xu.

Separated from upcoming work to allow easier differentiation between
non-pointers, single and double pointers. Inclusion of thr_private.h
already pr

pthreads: Use pthread_t type in libthread_xu.

Separated from upcoming work to allow easier differentiation between
non-pointers, single and double pointers. Inclusion of thr_private.h
already provides all needed information to dereference these types.

No functional change

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pthreads - Bypass third-party allocators for internal allocations

* Adjust libthread_xu to always use libc's malloc/free (__malloc,
__free), bypassing third party allocators.

* Fixes interactions

pthreads - Bypass third-party allocators for internal allocations

* Adjust libthread_xu to always use libc's malloc/free (__malloc,
__free), bypassing third party allocators.

* Fixes interactions between third party alocators and pthreads
which often cause deadlocks or other chicken-and-egg issues,
or require serious hacks to work around.

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Add missing restrict qualifiers in POSIX function definitions/declarations.

This creates no further -Wrestrict warnings with gcc80 in buildworld.

libthread_xu - Fix rtld and refactor locks

* Add a separate atfork facility for internal pthread atfork entities
(sem and rtld) which must execute after all user atfork entities
pre-fork and bef

libthread_xu - Fix rtld and refactor locks

* Add a separate atfork facility for internal pthread atfork entities
(sem and rtld) which must execute after all user atfork entities
pre-fork and before all user atfork entities post-fork.

* Install an atfork handler for rtld-elf (also requires rtld-elf to
be updated). The handler will ensure that RTLD locks are in a sane
state prior to fork (by acquiring them), and will then release the
locks post-fork. This is the primary fix for lang/rust and cargo.

Also do not issue _thr_rtld_fini() when threading drops to 0.
Once threading has been set, rtld's pthread locks remain installed.

* Refactor thr_cond.c. Refactor condition variables to perform
according to the spec. Use a TAILQ to make pthread_cond_signal()
work exactly as described in the manual (that is, waking up only
one waiter at a time).

* Refactor thr_mutex.c. Primary instrument for debugging and
clean up. Also deal with improper EINTR handling.

* Refactor thr_fork.c. Implement the new atfork facility for
internal atfork handlers.

* Refactor thr_rwlock.c. Add debugging, cleanup.

* thr_sem.c now uses the internal atfork handler to ensure proper
ordering.

* thr_sig.c implements debugging features.

* Refactor thr_umtx.c... the low level mutex code. Store the id
for additonal verification and use an atomic lock to clear the
lock instead of an assignment. Properly ignore EINTR.

* Cleanup init_private() a bit.

* Add PTHREADS_DEBUGGING=TRUE and PTHREADS_DEBUGGING2=TRUE make
flags. The first writes out a garbage file in /tmp for all
locking operations as they occur. The second is used for
point debugging and writes out a file when signal 63 is sent
to the program.

* Add cpu_ccfence() in various places that might need it (a hack
for the moment, userland cannot currently #include
"machine/cpufunc.h").

* Should fix lang/rust and 'cargo'

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pthread: Fix some warnings, do not raise WARNS to 6.

Using -Os will create lots of -Winline, thus leave at 5 by default.
Sorry for __is_threaded.

pthread: General pre-cleanup (style, typos etc)

No functional change.

Make pthread_*_destroy() more standards compliant

Function pthread_{mutex,cond,rwlock}_destroy() returned EINVAL when the
mutex/cond/rwlock was initialized statically via one of the
PTHREAD_*_INITIA

Make pthread_*_destroy() more standards compliant

Function pthread_{mutex,cond,rwlock}_destroy() returned EINVAL when the
mutex/cond/rwlock was initialized statically via one of the
PTHREAD_*_INITIALIZER macros and not being used before destruction. We now
return success (0) instead, as it would have been the case when the *_init()
function were used for initialization. This is also the behaviour Linux
exhibits.

Note that we now can no longer detect multiple calls to *_destroy(). Multiple
calls will do no harm, but return success.

While there, fix some potential null pointer derefs in cond and rwlock.

Fixes: #2763

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Initial import of binutils 2.22 on the new vendor branch

Future versions of binutils will also reside on this branch rather
than continuing to create new binutils branches for each new version.

WARNS level 4 cleanup.

Move some global variables into its module, remove priority mutex code
which does not work correctly.

Convert weak reference to strong reference so that static library
will work better.

Fix brokeness by using _pthread_xxx functions instead.

Remove unused strong reference.

Cleanup the TLS implementation:
- Define the TCB layout in machine/tls.h, define wether tcb_self exists or
not.
- Define the layout of the DTV, not used yet.
- Define the TLS variant
- Define commo

Cleanup the TLS implementation:
- Define the TCB layout in machine/tls.h, define wether tcb_self exists or
not.
- Define the layout of the DTV, not used yet.
- Define the TLS variant
- Define common access functions (tls_get_tcb, tls_get_curthread, tls_set_tcb)
and the RTLD functions.

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Import initial version of 1:1 pthread library.