pthread_spin_unlock man page on FreeBSD

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PTHREAD_SPIN_LOCK(3)	 BSD Library Functions Manual	  PTHREAD_SPIN_LOCK(3)

NAME
     pthread_spin_lock, pthread_spin_trylock, pthread_spin_unlock — lock or
     unlock a spin lock

LIBRARY
     POSIX Threads Library (libpthread, -lpthread)

SYNOPSIS
     #include <pthread.h>

     int
     pthread_spin_lock(pthread_spinlock_t *lock);

     int
     pthread_spin_trylock(pthread_spinlock_t *lock);

     int
     pthread_spin_unlock(pthread_spinlock_t *lock);

DESCRIPTION
     The pthread_spin_lock() function will acquire lock if it is not currently
     owned by another thread.  If the lock cannot be acquired immediately, it
     will spin attempting to acquire the lock (it will not sleep) until it
     becomes available.

     The pthread_spin_trylock() function is the same as pthread_spin_lock()
     except that if it cannot acquire lock immediately it will return with an
     error.

     The pthread_spin_unlock() function will release lock, which must have
     been previously locked by a call to pthread_spin_lock() or
     pthread_spin_trylock().

RETURN VALUES
     If successful, all these functions will return zero.  Otherwise, an error
     number will be returned to indicate the error.

     None of these functions will return EINTR.

ERRORS
     The pthread_spin_lock(), pthread_spin_trylock() and pthread_spin_unlock()
     functions will fail if:

     [EINVAL]		The value specified by lock is invalid or is not ini‐
			tialized.

     The pthread_spin_lock() function may fail if:

     [EDEADLK]		The calling thread already owns the lock.

     The pthread_spin_trylock() function will fail if:

     [EBUSY]		Another thread currently holds lock.

     The pthread_spin_unlock() function may fail if:

     [EPERM]		The calling thread does not own lock.

SEE ALSO
     pthread_spin_destroy(3), pthread_spin_init(3)

HISTORY
     The pthread_spin_lock(), pthread_spin_trylock() and pthread_spin_unlock()
     functions first appeared in library “libkse” in FreeBSD 5.2, and in
     library “libthr” in FreeBSD 5.3.

BUGS
     The implementation of pthread_spin_lock(), pthread_spin_trylock() and
     pthread_spin_unlock() is expected to conform to IEEE Std 1003.2
     (“POSIX.2”).

BSD			       January 22, 2004				   BSD
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