Memory leak in shared objects removed.

Memory leak in shared objects removed.

The memory leak in write operation for protected critical sections has
been solved. Now the backup storage is an automatic variable for the
critical section invocation, and all the memory is allocated and freed
therein.

It is true that this cause much more overhead at each invocation, but
this is still better than undefinitely leaking memory, also because it
can be accounted for (if calculated) in blocking time (not implemented
yet).