Lecture 16: Review of Semaphore Syntax
published: Sept. 7, 2010, recorded: April 2008, views: 300
released under terms of: Creative Commons Attribution Non-Commercial (CC-BY-NC)
Report a problem or upload filesIf you have found a problem with this lecture or would like to send us extra material, articles, exercises, etc., please use our ticket system to describe your request and upload the data.
Enter your e-mail into the 'Cc' field, and we will keep you updated with your request's status.
So, when you do a semaphore weight against a zero variable, then this thread actually says oh, I can’t decrement that, at least not now. I need somebody else in another thread to actually plus plus this so that I can actually pass through a minus minus without making the number negative. Does that make sense to people? Okay, so programmatically, the implementation of semaphore weight is in touch with the thread library and so it actually when it’s attached to a zero behind the scenes, it immediately says ok, I can’t make any progress right now. It pulls itself off the processor. ...
See the whole transcript at Programming Paradigms - Lecture 16
Link this pageWould you like to put a link to this lecture on your homepage?
Go ahead! Copy the HTML snippet !