pthread_spin_unlock - unlock a spin lock object (ADVANCED REALTIME THREADS)
The pthread_spin_unlock() function shall release the spin lock referenced by lock which was locked via the pthread_spin_lock() or pthread_spin_trylock() functions. The results are undefined if the lock is not held by the calling thread. If there are threads spinning on the lock when pthread_spin_unlock() is called, the lock becomes available and an unspecified spinning thread shall acquire the lock.
The results are undefined if this function is called with an uninitialized thread spin lock.
Upon successful completion, the pthread_spin_unlock() function shall return zero; otherwise, an error number shall be returned to indicate the error.
The pthread_spin_unlock() function may fail if:
- An invalid argument was specified.
- The calling thread does not hold the lock.
This function shall not return an error code of [EINTR].
The pthread_spin_unlock() function is part of the Spin Locks option and need not be provided on all implementations.
pthread_spin_destroy(), pthread_spin_lock(), the Base Definitions volume of IEEE Std 1003.1-2001, <pthread.h>
First released in Issue 6. Derived from IEEE Std 1003.1j-2000.
In the SYNOPSIS, the inclusion of <sys/types.h> is no longer required.