pthread_key: set value planned for destruction to NULL.

* This fixes bug fix #10951.

Change-Id: I152cea3651b3307171ea4d6a0c49aceae2f0f797
Reviewed-on: https://review.haiku-os.org/c/1456
Reviewed-by: Rene Gollent <rene@gollent.com>

kernel: atomic_*() functions rework

* No need for the atomically changed variables to be declared as
volatile.
* Drop support for atomically getting and setting unaligned data.
* Introduce atomic_get_and_set[64]() which works the same as
atomic_set[64]() used to. atomic_set[64]() does not return the
previous value anymore.

* As requested by POSIX, we now have PTHREAD_STACK_MIN, and PTHREAD_KEYS_MAX
defined in limits.h.
* This closes ticket #2559.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26982 a95241bf-73f2-0310-859d-f6bbb57e9c96

Some work on pthreads:
* Made the pthread_cond_t internals public. This is necessary to support
process shared condition variables. Fixed initializer macro.
* Made the pthread_rwlockattr_t structure opaque.
* pthread_t is no longer typedef'ed to int. It's the pointer to the
internal _pthread_thread structure.
* Removed __get_pthread(). pthread_self() can be used instead.
* No longer tunnel the pthread exit value through Haiku's thread exit
value. We do have a separate field in the _pthread_thread structure
for it, now.
* Handle detaching of threads correctly.
* pthread_rwlockattr_{g,s}etpshared() use the
PTHREAD_PROCESS_{SHARED,PRIVATE} constants, now.
* Commented out yet unsupported structures (barriers, spinlocks).
* Rebuilt APR optional package. The pthread changes weren't binary
compatible.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25582 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Replaced the previous pthread_key implementation with a lockless one
that does not rely on the Be API TLS anymore, and is also more compliant
with respect to the lifespan of the key specific values.
* It supports up to 256 different keys, which is equivalent of the solution
that FreeBSD offers.
* The main thread now also gets a pthread_thread structure.
* Reenabled the POSIX suite test pthread_key_delete_2-1 as we now pass it.
* This also fixes bug #1642.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25000 a95241bf-73f2-0310-859d-f6bbb57e9c96

kernel: atomic_*() functions rework

* No need for the atomically changed variables to be declared as
volatile.
* Drop support for atomically getting and setting unaligned data.
* Introduce atomic_get_and_set[64]() which works the same as
atomic_set[64]() used to. atomic_set[64]() does not return the
previous value anymore.

* As requested by POSIX, we now have PTHREAD_STACK_MIN, and PTHREAD_KEYS_MAX
defined in limits.h.
* This closes ticket #2559.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26982 a95241bf-73f2-0310-859d-f6bbb57e9c96

Some work on pthreads:
* Made the pthread_cond_t internals public. This is necessary to support
process shared condition variables. Fixed initializer macro.
* Made the pthread_rwlockattr_t structure opaque.
* pthread_t is no longer typedef'ed to int. It's the pointer to the
internal _pthread_thread structure.
* Removed __get_pthread(). pthread_self() can be used instead.
* No longer tunnel the pthread exit value through Haiku's thread exit
value. We do have a separate field in the _pthread_thread structure
for it, now.
* Handle detaching of threads correctly.
* pthread_rwlockattr_{g,s}etpshared() use the
PTHREAD_PROCESS_{SHARED,PRIVATE} constants, now.
* Commented out yet unsupported structures (barriers, spinlocks).
* Rebuilt APR optional package. The pthread changes weren't binary
compatible.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25582 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Replaced the previous pthread_key implementation with a lockless one
that does not rely on the Be API TLS anymore, and is also more compliant
with respect to the lifespan of the key specific values.
* It supports up to 256 different keys, which is equivalent of the solution
that FreeBSD offers.
* The main thread now also gets a pthread_thread structure.
* Reenabled the POSIX suite test pthread_key_delete_2-1 as we now pass it.
* This also fixes bug #1642.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25000 a95241bf-73f2-0310-859d-f6bbb57e9c96