http://www.cs.rpi.edu/wwc/salsa
Token Passing Continuation
•Insures that each message in the expression is sent after the previous message has been processed. It also allows that the return value of one message invocation may be used as an argument for a later invocation in the expression.
–Example:
•a1<-m1() @ a2<-m2( token );
•Send m1 to a1 and then after m1 finishes, send the result with m2 to a2.