true if the work was dispatched, false if the pool is
exhausted and at maximum capacity.
FiberPool.spawn
bool spawn(void delegate() work) @trustedSpawn a work item on a fiber from the pool.
If a free fiber is available, reuses it by setting its work slot and un-parking it. Otherwise allocates a new fiber (unless the pool has reached maxSize).
Parameters
work | The delegate to execute inside a pooled fiber. |