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https://issues.apache.org/jira/browse/IGNITE-1439?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15973180#comment-15973180
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Igor Sapego commented on IGNITE-1439:
-------------------------------------
Implemented prototype for Windows. As we have to support Windows XP I can't use
Condition Variables
(https://msdn.microsoft.com/en-us/library/windows/desktop/ms682052(v=vs.85).aspx),
which would be perfect for cross-platform solution. So instead I used
Manual-reset Event objects
(https://msdn.microsoft.com/en-us/library/windows/desktop/ms682655(v=vs.85).aspx)
and critical sections. Current implementation seems to be correct though I
have not tested it properly yet.
Some details of current implementation:
To create {{Future}} one needs to first create {{Promise}} object. {{Promise}}
is object which used to set value or error for the linked {{Future}} objects.
Once {{Promise}} created, one can call {{Promise::GetFuture()}} to get instance
of related {{Future}} object. There may be unlimited number of futures for
every {{Promise}}. {{Promise}} can't be copied though. Error or value can be
set only once for the {{Promise}}. If someone tries to set value or error to a
set {{Promise}} this will result in exception. If {{Promise}} instance gets
destructed before any value or error has been set error is automatically set
for all linked {{Future}} objects.
On any {{Future}} object user can call either {{Wait}}, {{WaitFor}} or {{Get}}
methods. All these methods are blocking. If {{Get}} called on future for which
error has been set this will result in exception.
Obviously enough, {{Future}} class is a part of public API, while {{Promise}}
is internal class.
> CPP: Implement futures.
> -----------------------
>
> Key: IGNITE-1439
> URL: https://issues.apache.org/jira/browse/IGNITE-1439
> Project: Ignite
> Issue Type: Task
> Components: platforms
> Affects Versions: 1.1.4
> Reporter: Vladimir Ozerov
> Assignee: Igor Sapego
> Labels: cpp
> Fix For: 2.1
>
>
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