POSIX: introduce sem_clockwait

will appear in the next version: https://www.opengroup.org/austin/docs/austin_1110.pdf

Change-Id: Iee3faf23647aa5244ad316fe1c3d825592483935
Reviewed-on: https://review.haiku-os.org/c/haiku/+/4966
Reviewed-by: waddlesplash <waddlesplash@gmail.com>
Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>

Reimplement unnamed POSIX semaphores using user_mutex

* Fixes sharing semantics, so non-shared semaphores in non-shared
memory do not become shared after a fork.
* Adds two new system calls: _user_mutex_sem_acquire/release(),
which reuse the user_mutex address-hashed wait mechanism.
* Named semaphores continue to use traditional sem_id semaphores.

Updated copyright in headers. No functional change.

Updated posix headers to remove commas from copyright line, to match the preferred coding guidelines.
Cleaned up some header style violations, making sure there are two blank lines after the header guards.
This fixes the posix header part of #2191.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39288 a95241bf-73f2-0310-859d-f6bbb57e9c96

* pthread.h should include sched.h (bug #3516)
* semaphore.h should include fcntl.h


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29438 a95241bf-73f2-0310-859d-f6bbb57e9c96

Removed <syscalls.h>' dependency to <semaphore.h> by giving the sem_t
structure a name.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26015 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added some padding to the sem_t structure.
* Changed the semantics of unnamed semaphores. Before parent and child
of a fork() would always share an earlier created semaphore. Now we do
that only, if the "shared" parameter of sem_init() was true. That's
still not quite the behavior Linux and Solaris have, but should be
perfectly fine with how reasonable code would use the API.
* There's a global table for shared unnamed semaphores now. ATM a
semaphore is leaked when no one explicitly destroys it (just as with
named sems).
* Enforce per-team and global semaphore number limits.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25362 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added support for POSIX semaphores (the ones from the XSI extension
Realtime option group). The implementation should be complete, but is
totally untested yet.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25326 a95241bf-73f2-0310-859d-f6bbb57e9c96

Reimplement unnamed POSIX semaphores using user_mutex

* Fixes sharing semantics, so non-shared semaphores in non-shared
memory do not become shared after a fork.
* Adds two new system calls: _user_mutex_sem_acquire/release(),
which reuse the user_mutex address-hashed wait mechanism.
* Named semaphores continue to use traditional sem_id semaphores.

Updated copyright in headers. No functional change.

Updated posix headers to remove commas from copyright line, to match the preferred coding guidelines.
Cleaned up some header style violations, making sure there are two blank lines after the header guards.
This fixes the posix header part of #2191.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@39288 a95241bf-73f2-0310-859d-f6bbb57e9c96

* pthread.h should include sched.h (bug #3516)
* semaphore.h should include fcntl.h


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29438 a95241bf-73f2-0310-859d-f6bbb57e9c96

Removed <syscalls.h>' dependency to <semaphore.h> by giving the sem_t
structure a name.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@26015 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Added some padding to the sem_t structure.
* Changed the semantics of unnamed semaphores. Before parent and child
of a fork() would always share an earlier created semaphore. Now we do
that only, if the "shared" parameter of sem_init() was true. That's
still not quite the behavior Linux and Solaris have, but should be
perfectly fine with how reasonable code would use the API.
* There's a global table for shared unnamed semaphores now. ATM a
semaphore is leaked when no one explicitly destroys it (just as with
named sems).
* Enforce per-team and global semaphore number limits.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25362 a95241bf-73f2-0310-859d-f6bbb57e9c96

Added support for POSIX semaphores (the ones from the XSI extension
Realtime option group). The implementation should be complete, but is
totally untested yet.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@25326 a95241bf-73f2-0310-859d-f6bbb57e9c96