Concurrent computing: Difference between revisions
Content deleted Content added
→{{header|C++}}: Added C++ implementation |
m →{{header|Ada}}: Not null constraint added (Ada 2005) |
||
| Line 7: | Line 7: | ||
procedure Concurrent_Hello is |
procedure Concurrent_Hello is |
||
task type Writer (Message : access String); |
task type Writer (Message : not null access String); |
||
task body Writer is |
task body Writer is |
||
Seed : Generator; |
Seed : Generator; |
||
begin |
begin |
||
Reset (Seed); |
Reset (Seed); -- This is time-dependent, see ARM A.5.2 |
||
delay Duration (Random (Seed)); |
delay Duration (Random (Seed)); |
||
Put_Line (Message.all); |
Put_Line (Message.all); |
||
| Line 26: | Line 26: | ||
end Concurrent_Hello;</lang> |
end Concurrent_Hello;</lang> |
||
Note that random generator object is local to each task. It cannot be accessed concurrently without mutual exclusion. In order to get different initial states of local generators Reset is called. |
Note that random generator object is local to each task. It cannot be accessed concurrently without mutual exclusion. In order to get different initial states of local generators Reset is called (see [http://www.adaic.org/resources/add_content/standards/05rm/html/RM-A-5-2.html ARM A.5.2]). |
||
=={{header|ALGOL 68}}== |
=={{header|ALGOL 68}}== |
||