DragonFly On-Line Manual Pages
PTHREAD_SPIN_LOCK(3) DragonFly Library Functions Manual PTHREAD_SPIN_LOCK(3)
pthread_spin_lock, pthread_spin_trylock, pthread_spin_unlock -- lock or
unlock a spin lock
POSIX Threads Library (libpthread, -lpthread)
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
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
The pthread_spin_unlock() function will release lock, which must have
been previously locked by a call to pthread_spin_lock() or
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.
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-
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.
The implementation of pthread_spin_lock(), pthread_spin_trylock() and
pthread_spin_unlock() is expected to conform to IEEE Std 1003.2
DragonFly 3.5 July 10, 2009 DragonFly 3.5