Libevent is pretty cool, but it is not “fast” for all applications. For example, it retrieves the system clock frequently, which can be a performance. libtorque: Portable Multithreaded Continuations decade’s architectures and operating systems, as libevent [19], libev, Java NIO and others achieved ubiquity much room for improving non-blocking I/O solu- Network programming abounds with task idioms. .. this approach could be the fastest path to true zero- . I want to know how to use libevent l.4,especially the use of http. can anybody give me a Fast portable non-blocking network programming with Libevent.

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If you run a single thread without the event based approacheach request must wait for preceding requests to finish blockjng before running. It splits sequential algorithms up into multiple callbacks with manually managed shared state.

It seems that a lot of people sincerely believe that this stuff is “easier” or “better” just because it has the fancy new Spicy Event Sauce. When the buffer event is freed, close the underlying transport. Hacker News new comments show ask jobs submit. I know what you mean about an event loop complicating error handling from callbacks, though.

PHP: Constructing signal events – Manual

It feels sort of like writing in continuation-passing-style. OK, I gotta ask: Also, I’m not convinced that the “nasty state bugs” from reorganizing around an event loop are necessarily worse than the ones that come fas using threads with shared state. Where I work, there’s one single library for concurrency, and every program or toolkit uses it.


One problem with using an event dispatcher like libevent is that libraries that make their own blocking calls won’t cooperate.

Multiple requests can be running in parallel without fully blocking each other. An event occured during a write operation on the bufferevent.

Fast portable non-blocking network programming with Libevent

Numeric file descriptor associated with the buffer event. Sure, but libraries underneath you have to cooperate for you to use it to the fullest potential.

Remember how much we wrote, and if we still have more data to write, wait for the connection to become writable again. There are plenty of portalbe that won’t ever need to handle more than a couple simultaneous connections, and that way you don’t need to bother with asynchronous IO.

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Constructing signal events

That no common means ntework been invented for that is what I’m sad about. Within a single thread they do serialize, but only by the length of your callbacks. An error occurred during a bufferevent operation. It’s one of those things that I’ve read about different methods here and there, but I’ve never come across one good source that compared and contrasted the various techniques.

Wait for the connection to become writable Write as much of the data as we can Remember how much we wrote, witu if we still have more data to write, wait for the connection to become writable again. It wasn’t too long ago when people were excited about fork-for-each-connection servers, though at least half of it was “OMG Unix system calls from Ruby” from people who probably don’t know C.


On the other end, say you libeveht a blockung per socket – that’s not effective as the memory usage for reserving thread stack space will limit your maximum connection count. RoboTeddy on Jan 11, Most of it is still relevant, though it was written before scary parallel SMP became common 8-way is routine for a server these days. Underlying output buffer object EventBuffer.

When we want to write data, for example, the usual pattern looks like: RoboTeddy on Jan 11, Prograjming I had to speculate: Event programming is useful in that it effectively performs ljbevent multitasking without the overhead of thread stack space. EOF Got an end-of-file indication on the buffer event. It’s frombut is a good overview of well-understood techniques. That means you’ll often be stuck with limited capabilties, unless you write your own libraries or hack up existing ones.

See the other flags for which event it was. Sequential code is very readable, but not efficient at scale. Fast portable non-blocking network programming with Libevent wangafu. Properties fd Numeric file descriptor associated with the buffer event.

Equals to NULLif there is no file descriptor socket associated with the buffer event.