Difference between revisions of "Ready"
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The send of assignment ''a:=b'' will only begin once the receive from process 1 has been issued. With the statement ''a:=c'' the send, even though it is [[nonblocking]], will only start once a matching receive has been issued too. | The send of assignment ''a:=b'' will only begin once the receive from process 1 has been issued. With the statement ''a:=c'' the send, even though it is [[nonblocking]], will only start once a matching receive has been issued too. | ||
| + | ''Since: Version 0.41b'' | ||
[[Category:Type Library]] | [[Category:Type Library]] | ||
[[Category:Compound Types]] | [[Category:Compound Types]] | ||
[[Category:Communication Mode Types]] | [[Category:Communication Mode Types]] | ||
Revision as of 18:23, 13 January 2013
Syntax
ready[ ]
Semantics
The ready type will force P2P Send to start only if a matching receive has been posted by the target processor. When used in conjunction with the nonblocking type, communication start will wait until a matching receive is posted. This type acts as a form of handshaking and can improve performance in some uses.
Example
var a:Int::allocated[single[on[1]]]; var b:Int::allocated[single[on[2]]] :: ready[]; var c:Int::allocated[single[on[2]]] :: ready[] :: nonblocking[]; a:=b; a:=c;
The send of assignment a:=b will only begin once the receive from process 1 has been issued. With the statement a:=c the send, even though it is nonblocking, will only start once a matching receive has been issued too.
Since: Version 0.41b
