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Permalink Posted 29-Jul-13 12:27pm Gareth Jensen240 Add a Solution Add your solution here B I U S small BIG code Plain TextC++CSSC#Delphi / PascalF#HTML / XML / ASPJavaJavascriptObjective-CSQLSwiftPerlPHPPythonVBXMLvar < > A common remedy that is often cited is to use a thread pool but thread pools only solve a small part of the problem. How to make random draws from an unspecified distribution? onClosed()].

Reload to refresh your session. Application Lifecycle> Running a Business Sales / Marketing Collaboration / Beta Testing Work Issues Design and Architecture ASP.NET JavaScript C / C++ / MFC> ATL / WTL / STL Managed C++/CLI The function will continue to wait until an entry is removed from the port or until a time-out occurs, if specified as a value other than INFINITE. Solution 1 Accept Solution Reject Solution Without the actual code and more info about environment it is very difficult to guess what is happening.Are you starting with the event non-signalled?


As I’ve mentioned, these values are passed to the thread that calls the GetQueuedCompletionStatus function to dequeue the completion packet and have no meaning to the completion port itself. Those questions were more kind of an example. the request will be removed from a list?) but I'm not sure if I can avoid the memory leak, because the io_req object will still be there... –Marco Pagliaricci Mar 21 Well, this is exactly what I do, I send a packet with a 'exit' operation to all threads.

This can be any value and is included in the completion packet for any I/O requests for the given file handle. The request cannot be fulfilled by the server maxPending-startingNbThreads : maxPending; if((ULONG)tracker.stats.PendingRequests<=looseMaxPending && tracker.stats.AllocatedRequests<=tracker.stats.PendingRequests) { allow=TRUE; } return allow; } BOOL AsyncFuzzer::DequeueIoPacket(IoRequest **request) { BOOL gotRequest=FALSE, ioSuccess=FALSE; DWORD threadID, nbOfBytes, error; ULONG_PTR specialPacket; LPOVERLAPPED pOvrlp; // Get current TID Createiocompletionport A book would be ideal.

If a completion packet does not appear within the specified time, the function times out, returns FALSE, and sets *lpOverlapped to NULL. The other out parameters contain indeterminate values. The reason for the first note is that if you have multiple threads waiting on an IOCP then thread scheduling issues may mean that your code processes the completions in a Gone are the days where 99% of computers only had a single processor.

That means only one pill is needed for any number of pool threads. –Martin James Mar 22 '13 at 13:48 There's no need to use CancelIOEx at all, IMHO. Error_abandoned_wait_0 What am I doing wrong? There are a few operations involved in using a completion port: Creating a completion port Associating file handles Dequeuing completion packets Optionally queuing your own completion packets Creating completion port threads it tells you there will be throughput of the buffer.


Step one is to close the sources of completions, so close or abort your socket connections, close files, etc. Dequeuing completion packets As I’ve mentioned, you can dequeue completion packets on any thread in the process that created the completion port. Postqueuedcompletionstatus Threads that block their execution on an I/O completion port are released in last-in-first-out (LIFO) order, and the next completion packet is pulled from the I/O completion port's FIFO queue for Getqueuedcompletionstatus Example This avoids the context switching overhead and all the available processors are being used efficiently.

Ultimate Australian Canal What are the benefits of an oral exam? As with APCs, these file handles may represent files on a local or remote file system or they could represent other communication mechanisms such as pipes or sockets. Thanks for the tips, hopefully this helps anyone who gets this far. Consider what happens with a concurrency value of one and multiple threads waiting in the GetQueuedCompletionStatus function call. Postqueuedcompletionstatus Example

This crate is only available on Windows. Reload to refresh your session. The main challenge with completion ports is getting your head around the confusing API. If dwMilliseconds is zero and there is no I/O operation to dequeue, the function will time out immediately.

What early computers had excellent BASIC (or other language) at bootup? Filtergetmessage For example, GetQueuedCompletionStatus description is the following: "Attempts to dequeue an I/O completion packet from the specified I/O completion port. This is useful for notifying worker threads of external events, for example.

Note  In the previous example, the extra threads appear to be useless and never run, but that assumes that the running thread never gets put in a wait state by some other

You then queue the special completion packet as many times as you have handles in the array and then call WaitForMultipleObjects on the array to wait for all of the threads It will take a while, if my application must close IOCP right now, with the flag you can do that immediately. –Marco Pagliaricci Mar 21 '13 at 17:11 Well, Maybe I've misunderstood how to use the IOCP loop. Containing_record Should the CreateThread function fail at some point we can much more easily back out of the operation without having to wait for any running threads to terminate: if (0 ==

Downloads and tools Windows 10 dev tools Visual Studio Windows SDK Windows Store badges Essentials API reference (Windows apps) API reference (desktop apps) Code samples How-to guides (Windows apps) Learning resources If I understand correctly, the documentation would be accurate if it stated that "completion packets are ALWAYS queued and dequeued to/from a completion port in FIFO order." Standard threading behavior (scheduling, more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed To create a completion port, use the CreateIoCompletionPort function.

I described how to create completion port threads earlier in this article.