By older versions of the POSIX standard the first method with an initializer is only guaranteed to work with statically allocated variables, not when the variable is an auto variable that is defined in a function body. Although I have never seen a platform where this would not be allowed, even for auto variables, and … Read more
I don’t know why you’re using the Window’s Mutex instead of Python’s. Using the Python methods, this is pretty simple: But note, because of the architecture of CPython (namely the Global Interpreter Lock) you’ll effectively only have one thread running at a time anyway–this is fine if a number of them are I/O bound, although … Read more
See this page: http://www.oracle.com/technetwork/articles/javase/index-140767.html It has a slightly different pattern which is (I think) what you are looking for: In this usage, you’re only calling release() after a successful acquire()
Is there any difference between a binary semaphore and mutex or are they essentially the same?
Here goes my humble attempt to explain the concept to newbies around the world: (a color coded version on my blog too) A lot of people run to a lone phone booth (they don’t have mobile phones) to talk to their loved ones. The first person to catch the door-handle of the booth, is the … Read more
A lock allows only one thread to enter the part that’s locked and the lock is not shared with any other processes. A mutex is the same as a lock but it can be system wide (shared by multiple processes). A semaphore does the same as a mutex but allows x number of threads to enter, this … Read more
A lock allows only one thread to enter the part that’s locked and the lock is not shared with any other processes. A mutex is the same as a lock but it can be system wide (shared by multiple processes). A semaphore does the same as a mutex but allows x number of threads to enter, this … Read more
When I am having a big heated discussion at work, I use a rubber chicken which I keep in my desk for just such occasions. The person holding the chicken is the only person who is allowed to talk. If you don’t hold the chicken you cannot speak. You can only indicate that you want … Read more