doc: services: portability: posix: support for POSIX_SPIN_LOCKS

Ensure `POSIX_SPIN_LOCKS` are documented as part of the
mandatory option requirements according to IEEE Std 1003.1-2017.

Additionally, list the functions implemented according to the
standard.

Signed-off-by: Christopher Friedt <[email protected]>

Author: cfriedt

doc/services/portability/posix.rst

@@ -59,6 +59,7 @@ as POSIX.1-2017).
     POSIX_FILE_LOCKING,
     POSIX_SIGNALS,
     POSIX_SINGLE_PROCESS,
+    POSIX_SPIN_LOCKS,yes
     POSIX_THREADS_BASE,yes
     XSI_THREAD_MUTEX_EXT,yes
     XSI_THREADS_EXT,yes
@@ -93,6 +94,7 @@ Zephyr.
     _POSIX_REALTIME_SIGNALS,
     _POSIX_SEMAPHORES,yes
     _POSIX_SHARED_MEMORY_OBJECTS,
+    _POSIX_SPIN_LOCKS,yes
     _POSIX_SYNCHRONIZED_IO,
     _POSIX_THREAD_ATTR_STACKADDR,yes
     _POSIX_THREAD_ATTR_STACKSIZE,yes
@@ -385,6 +387,16 @@ required for error and event handling.
     igsuspend(),
     sigwait()
 
+.. csv-table:: POSIX_SPIN_LOCKS
+   :header: API, Supported
+   :widths: 50,10
+
+    pthread_spin_destroy(),yes
+    pthread_spin_init(),yes
+    pthread_spin_lock(),yes
+    pthread_spin_trylock(),yes
+    pthread_spin_unlock(),yes
+
 
 POSIX_DEVICE_IO
 +++++++++++++++