{"action":"created","issue":{"url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic/issues/10","repository_url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic","labels_url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic/issues/10/labels{/name}","comments_url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic/issues/10/comments","events_url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic/issues/10/events","html_url":"https://github.com/mpiforumbot/mpi-forum-historic/issues/10","id":167207074,"number":10,"title":"MPI_CANCEL Argument is Wrong 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Menlo 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by _jsquyres_ on 2008-09-05 08:22:22 -0500**\n\n___\nItem 30.i: Why does the request argument to the C bindings MPI_CANCEL take a pointer?  The language neutral binding is IN, and the C++ binding is const.  This seems to be a contradiction.\n\n## History\n\nThis discrepancy has existed since MPI-1.\n\n## Proposed Solution\n\nThis cannot be changed easily because every MPI implementation uses\n(MPI_Request *) as the type to this function, and codes that use\nMPI_CANCEL correctly compile against it.  \n\nInstead of fixing the problem, I propose adding the following Rationale in MPI-2.1 section 3.8 p68:5, at the end of the\ndescription of MPI_CANCEL (right before the language neutral listing\nfor MPI_TEST_CANCELED) to explain the situation and prevent it from\ncoming up again in Forum discussions:\n\n    -Rationale.* Although the IN request handle parameter should not need to be passed by reference, the C binding has listed the argument type as (MPI_Request*) since MPI-1.0.  This function signature therefore cannot be changed without breaking existing MPI applications. *(End of rationale.)*\n\n## Impact on Implementations\n\nNone.\n\n## Impact on Applications / Users\n\nNone.\n\n## Alternative Solutions\n\nNone.\n\n## Entry for the Change Log\n\nNot applicable."},"comment":{"url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic/issues/comments/234744945","html_url":"https://github.com/mpiforumbot/mpi-forum-historic/issues/10#issuecomment-234744945","issue_url":"https://api.github.com/repos/mpiforumbot/mpi-forum-historic/issues/10","id":234744945,"user":{"login":"mpiforumbot","id":20617676,"avatar_url":"https://avatars.githubusercontent.com/u/20617676?v=3","gravatar_id":"","url":"https://api.github.com/users/mpiforumbot","html_url":"https://github.com/mpiforumbot","followers_url":"https://api.github.com/users/mpiforumbot/followers","following_url":"https://api.github.com/users/mpiforumbot/following{/other_user}","gists_url":"https://api.github.com/users/mpiforumbot/gists{/gist_id}","starred_url":"https://api.github.com/users/mpiforumbot/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/mpiforumbot/subscriptions","organizations_url":"https://api.github.com/users/mpiforumbot/orgs","repos_url":"https://api.github.com/users/mpiforumbot/repos","events_url":"https://api.github.com/users/mpiforumbot/events{/privacy}","received_events_url":"https://api.github.com/users/mpiforumbot/received_events","type":"User","site_admin":false},"created_at":"2016-07-23T22:41:14Z","updated_at":"2016-07-23T22:41:14Z","body":"**Originally by _RolfRabenseifner_ on 2008-12-16 17:50:19 -0600**\n\n___\nReviewed and it is okay."}}
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