The Solaris implementation of the Threads Module supports user-managed stacks.

If an attempt is made to set the user stack address to zero, or to set the user stack size to a value less than the minimum stack size returned by the getMinStackSize() function, a RWTHRBoundsError exception is produced.

The Threads Module imposes no upper limit for user stack size; the maximum stack size is effectively limited by the virtual memory space and pagefile size available to the user.

Attempts to query for a default user-stack address value or user-stack size value will result in an RWTHROperationNotAvailable exception. These values may only be queried after they have been set.

A call to setStackReserveSize() replaces or nullifies the attribute settings produced by any previous call to setUserStack() and vice-versa.