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What is file descriptor used for?
A file descriptor is an opaque handle that is used in the interface between user and kernel space to identify file/socket resources.
What is anonymous inode?
This would be a good definition of anonymous inode: it creates an inode inside a given directory without any name, which does not appear at all with ls . Then when you close the descriptor the file is deleted.
Why is epoll used?
epoll stands for event poll and is a Linux specific construct. It allows for a process to monitor multiple file descriptors and get notifications when I/O is possible on them. It allows for both edge-triggered as well as level-triggered notifications.
What does Epoll_wait return?
RETURN VALUE top On success, epoll_wait() returns the number of file descriptors ready for the requested I/O, or zero if no file descriptor became ready during the requested timeout milliseconds. On failure, epoll_wait() returns -1 and errno is set to indicate the error.
What is Epoll_wait in Linux?
epoll is a Linux kernel system call for a scalable I/O event notification mechanism, first introduced in version 2.5. Its function is to monitor multiple file descriptors to see whether I/O is possible on any of them.
How does a thread pool keep the application running?
The thread pool uses background threads, which do not keep the application running if all foreground threads have terminated. (This is a simple example of a race condition.) Many applications create threads that spend a great deal of time in the sleeping state, waiting for an event to occur.
How to request that a thread handle a work item?
To request that a work item be handled by a thread in the thread pool, call the QueueUserWorkItem method. This method takes as a parameter a reference to the method or delegate that will be called by the thread selected from the thread pool. There is no way to cancel a work item after it has been queued.
Is there a way to cancel a queue in ThreadPool?
This method takes as a parameter a reference to the method or delegate that will be called by the thread selected from the thread pool. There is no way to cancel a work item after it has been queued.
How are asynchronous timers handled in thread pool?
Asynchronous timers use the thread pool. Thread pool threads execute callbacks from the System.Threading.Timer class and raise events from the System.Timers.Timer class. When you use registered wait handles, a system thread monitors the status of the wait handles.