Difference between pages "Proc" and "Sync"

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(Created page with '== Syntax == sync name; == Semantics Will synchronise processes where they are needed. For instance, if using the asynchronous communication type, the programmer can synchron…')
 
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== Syntax ==
 
== Syntax ==
  
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proc n<br>
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sync name;
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{<br>
 
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process body<br>
 
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}
 
  
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where ''n'' is a variable or value known at compile time.
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== Semantics
  
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== Semantics ==
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Will synchronise processes where they are needed. For instance, if using the asynchronous communication type, the programmer can synchronise with a variable name and the keyword will ensure all communications of that variable are up to date. One sided communication (variable sharing MPMD style in a par loop) is also linked into this keyword and it will ensure all communication is completed. Without a variable will synchronise all outstanding variables that need synchronising. If a process has no variables that need syncing then it will ignore this keyword and continue.
  
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This will limit execution of a block to a certain process whose rank is guaranteed to be that specified.<br><br>
 
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''Note:'' A variable declared within a proc block and allocated multiple will in fact, by inference, be allocated to the group of processes which contains a single process who's rank is the same as the proc block's.
 
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== Example ==
 
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#include <io>
 
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function void main() {
 
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    proc 0 {
 
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      print("Hello from 0\n");
 
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    };
 
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    proc 1 {
 
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      print("hello from 1\n");
 
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    };
 
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};
 
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The code example will run on two processes, the first will display the message ''Hello from 0'', whilst the second will output the message ''hello from 1''.
 
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''Since: Version 0.41b''
 
 
[[Category:Parallel]]
 
[[Category:Parallel]]

Revision as of 23:52, 3 January 2010

Syntax

sync name;

== Semantics

Will synchronise processes where they are needed. For instance, if using the asynchronous communication type, the programmer can synchronise with a variable name and the keyword will ensure all communications of that variable are up to date. One sided communication (variable sharing MPMD style in a par loop) is also linked into this keyword and it will ensure all communication is completed. Without a variable will synchronise all outstanding variables that need synchronising. If a process has no variables that need syncing then it will ignore this keyword and continue.

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