#multi-thread

[tom2tec]

jamailmar ~ Multi-threaded Ogg Vorbis Decoder

Linux code to decode Ogg Vorbis files with multi-thread support sourceforge.net/projects/jamailmar

[rnaframework]

RNA Framework v2.5.4 released

This release fixes some bugs in multi-threading support, and introduces a new feature. Now, RF Compare automatically generates SVG graphics for each compared reference vs. predicted structure pair:

Check it out on GitHub!

[seonhooh]

possible deadlock in dataloader · Issue #1355 · pytorch/pytorch

the bug is described at pytorch/examples#148. I just wonder if this is a bug in PyTorch itself, as the example code looks clean to me. Also, I wonder if this is related to #1120.

PyTorch의 DataLoader 내부에서 OpenCV를 사용할 때, multi-thread 문제로 인해 deadlock이 발생할 수 있는 듯 하다.

cv2.setNumThreads(0)로 해결이 되는 경우가 있다고 한다.

[peeterjoot]

Differences between Locks, Mutexes, and Semaphores

Differences between Locks, Mutexes, and Semaphores

  James writes to me:

I’m having trouble finding concrete definitions for Locks, Mutexes, and Semaphores

What I do know is:

Semaphores keep track of how many processes have gained access (“P”) to a resource and block (suspend and send to priority queue) processes once it’s maxed out. They have no concept of ownership and anyone can call unlock (“V”)

Binary semaphores are the same as above except…

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[debugjournal]

Multi-thread functions update Qt GUI

In the program I am working on right now, I have a Qt GUI that display some relevant information. From time to time, the background thread is supposed to compute the information and update the display, such as the status bar and OpenGL viewer. At some point last week I added this functionality.

Since then I  started to run into some extremely random segmentation fault. It took me quite a while to track down the reasons. 

It turns out to be the update from the other non-GUI thread. For some reason it will crash the whole program. I am still looking into deeper causes, but for now, I just use a signal/slot to send the job back to the main GUI to update. It seems to work fine.

UPDATE: When specifying the connection betwen signals and slots, we need to specify the Qt connection type to avoid data hazard, although it's relatively rare.

connect(src, SIGNAL(signal-signature), dest, SLOT(slot-signature), Qt::QueuedConnection);

UPDATE 2: If you encounter something similar to the error below, probably you have this Qt dynamic dequeue issue.

[xcb] Unknown request in queue while dequeuing. [xcb] Most likely this is a multi-threaded client and XInitThreads has not been called. [xcb] Aborting, sorry about that. a.out: ../../src/xcb_io.c:179: dequeue_pending_request: Assertion `!xcb_xlib_unknown_req_in_deq' failed. Aborted (core dumped)

More info:

http://qt-project.org/doc/qt-4.8/threads-qobject.html

http://stackoverflow.com/questions/18109037/controlling-paintgl-method-how-to-decide-what-to-paint

http://stackoverflow.com/questions/2072735/emit-qt-signal-from-non-qt-thread-or-ouside-qt-main-event-loop-with-at-4-5

http://stackoverflow.com/questions/15051553/qt-signals-queuedconnection-and-directconnection

[unsanctiified-archive]

◤ I'm Not At Fault | Cam&Rock&Magnus

     Camille folded her arms over one another and hesitantly walked back and forth as the two of them waited for Magnus -- how exactly was she supposed to explain this..? Of course, Magnus knew Camille wasn't the most faithful immortal there was out there -- but to be dating another while the two were in a passionate relationship, and take that one seriously as well? It wasn't...cheating -- no, it was simply pleasing another. But things had changed and Camille was really beginning to feel for Rock -- it was...peculiar. "Magnus should be here any moment." She murmured before flashing Rock a slightly nervous smile. Ah, great...

[asimplemanofhyrule]

Welcoming Customers!::RP Open::

Tarlon stood behind his counter making note on some deliveries he would have to do later and some shipments he had to place. He paused to look around his shop and nodded actually enjoying the layout for today. Though he knew eventually he'll get bored with how things were displayed and would move it all around again. He didn't mind cause it gave him a chance to interact with customers and talk to them as he helped them find whatever they were looking for. It was a good feeling and he couldn't stop the wide grin from appearing on his face just from thinking about it. He truely did enjoy the company of people, from the age of 7 to the age of 29 and probably even after he hit 30 he enjoyed talking and interacting. Today was a good day, a few people stopped by and things had been traded our bought from him.

[peterko-blog]