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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