Name	spwan
Definition	spawn(e:expr(void),fpnum:val(int)):expr(int)
Defined in	ctrl.l
Implementation	icode
Description	Evaluate expression e in a new concurrent thread. forparnum will return the value given by fpnum in the new thread. The thread identifier for the new thread is returned.
Note	Most code should use forpar and | rather than spawn. The caller must not allow any variables that the spawned thread may access to be deallocated before the spawned thread is known to have completed.