Use the pthread_spin_trylock(3C) function to lock a spin lock and fail immediately if the lock is held by another thread.
int pthread_spin_trylock(pthread_spinlock_t *lock);
#include <pthread.h> pthread_spinlock_t lock; int ret; ret = pthread_spin_trylock(&lock); /* try to lock the spin lock */
Upon successful completion, the pthread_spin_trylock() function returns 0. Otherwise, one of the following error codes is returned.
A thread currently owns the spin lock.
The value specified by lock does not refer to an initialized spin lock object.