Andrew Schwartzmeyer created MESOS-8676:
-------------------------------------------
Summary: Fix os::read and os::write to work with files in
overlapped mode
Key: MESOS-8676
URL: https://issues.apache.org/jira/browse/MESOS-8676
Project: Mesos
Issue Type: Task
Reporter: Andrew Schwartzmeyer
Assignee: Andrew Schwartzmeyer
When fixing {{os::open}} to open real Windows {{HANDLE}} s to files in a
default overlapped mode, we'll need to fix {{os::read}} and {{os::write}} to
work with these. Since these functions are inherently synchronous, we'll just
use overlapped I/O but wait for completion, making the action synchronous.
Caveat: when files on Windows are opened in overlapped mode, they no longer
retain state about the offset. Because these functions currently use the CRT
APIs {{_read}} and {{_write}}, they act like POSIX file descriptors which are
advanced by N bytes per read and write. We can mimic this behavior by saving
the offset state in the {{WindowsFD}} abstraction.
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
