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It may be of interest to system architects who need to create a high-performance cross-platform networking servers, and to software engineers porting such code from Windows to Linux or vice versa.
It may also be of interest to the developers familiar with one technology who would like to learn more about another one. Both epoll and IOCP are efficient technologies when you need to support high performance networking with a large number of connections. They differ from other polling methods in may ways such as: However at the same time those technologies differ significantly, and it is important to understand how they differ.
Notification type The first and most important difference between epoll and IOCP is when you can receive a notification. When using epoll an application: If more than one event is triggered, the function picks as many as it could. Finds the event data pointer from the data union.
If the specific bits are set in the associated revent structure, initiates the specific operation such as read, write or both After the operation completes which should be immediateproceeds with the data read or send more data if any; Notably, the descriptor may have both events set at the same time, so the application can perform both read and write.
With IOCP an application: Calls GetQueuedCompletionStatus which blocks until exactly one operation is completed and posted the notification. It makes no difference if more than one operation completes, this function will only pick one.
Proceed with the data read or send more data if any; Only one completed operation could be got from a queue at the same time; The difference between notification types makes it possible — and fairly easy — to emulate IOCP with epoll while using a separate thread pool.
Wine project does just that. Data accessibility If the read operation is planned, there should be a buffer in your code somewhere to read into. If the write operation is planned, there should be a buffer in your code with the data to write.
Which may take a while. A networked server typically operates with connection objects which contain the socket descriptor as well as other linked data such as buffers.
Typically those objects are destroyed when the relevant socket is closed. There are, however, certain limitations when using IOCP. Both read and write operate on buffers, and require the buffers passed to them to be left intact until the operation completes. More, you are not allowed to touch the data in those buffers.
This places several important restrictions: If you write a proxy application, most likely you would have to introduce the double buffering, because both sockets would always have an active operation pending, and you could not touch their buffers.
If your connection manager class is designed the way it could destroy the connection class anytime for example when the connection class reported an error while processing the received datayour class instance cannot be destroyed until all the pending IOCP operations complete.
You would have to keep two structures as members of your socket class instead, passing one for use with ReadFile and another one for use with WriteFile.
Waiting condition modification When adding a new event condition such as we waited for socked available for reading, but now we also want to wait until it is available for writingboth epoll and IOCP make it easy to add a new condition. Epoll allows the polling mask to be modified anytime, and IOCP allows to start the new operation anytime.
Modifying or removing an existing condition, however, is different though. It could be performed from any thread, and will works safely even if other threads are waiting for the condition.Introduction. This article compares the difference between the use of epoll and Windows I/O Completion Port (hereby IOCP).
It may be of interest to system architects who need to create a high-performance cross-platform networking servers, and to software engineers .
And, if one blocking operation (say, write to a socket) would block, all other requests would wait for a response. By yielding the coroutine at the right moments, lwan blocks only on calls to epoll(4).
If the read operation is planned, there should be a buffer in your code somewhere to read into. If the write operation is planned, there should be a buffer in your code with the data to write. epoll doesn’t care about those buffers and does not use them; IOCP cares.
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