Pthread spin locks

[Peter Holmes]

I am not very sure about the spin lock behavior of pthreads.
   
  Here is the man page 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.

  For a single processor scenario.
  Let's say a pthread owns the lock and is blocked and now another thread tries to acquire it. Will the second thread not block until the first thread releases the lock.
   
   
  - Peter

 
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