Pushes an uninitialized item to the queue.
For items that are faster to initialize in place than to copy, this form will be faster.
how long to wait if no room to add immediately.
A pointer to the newly created item, so it can be filled with values.
See Implementation
Pushes an uninitialized item to the queue.
For items that are faster to initialize in place than to copy, this form will be faster.