multithreading - Publishing Concurrent Objects -

-

I am interested in technology that people use to publish the information and make changes in the data structures that many Concurrency is being shared without losing too much threads in threads. In my personal experience, I often come across single authors / many readers, where a formula is updating an item, but many threads are reading from the object and need to be informed of the changes.

Simple examples, consider a hashtable (assuming this thread is secure, through coarse grain locking, fine locking, or low-lock technique etc.). Thread 1 is responsible for inserting and removing information from hashtable, but is the only author. Other threads can be reported when a key is changed, a certain key changes, or any different ones that want to subscribe are not particularly important.

What techniques (I like suggestions for papers) will you use to ensure that information about timeline and correct changes is obtained?

You have actually asked about 2 different problems

Multiple Reader / Single Worker Exclusion

Update Notification (which is often called Supervisor Pattern)

Multiple Reader / Single Worm Lock is a classic problem for which a huge amount of literature is the real problem That many classic solutions include several mutes and or semaphores, and the first reading lock According to 6 write modified writing (Armdblu) cycles is too heavy to very heavy and 6 Armdu.

There are some solutions to both problems, efficiency and practicality, depending on how to read the arrival rate, the arrival rate of writing, the duration of the writing, the duration of reading, whether the updates can be batch, You need to upgrade, read the lock, downgrade a lock (looks like no in your case)

For an example of a hash table, you can use "Medium Granulate Locking" En Access Thread ) And only sections of the lobbets hash table (for different chain brains). With opening the lock, it is not necessary that the slots are checked on. Or you use the Hop-Scotch hash of a concurrent hash table algorithm

So far as the notification is concerned, there are some common questions:

Read the thread (and process) see every notification? Is the inspector a stable or dynamic group? I.e. notification "network" position Maybe (determined at compile time)


Comments

Post a Comment

Popular posts from this blog

c# - ListView onScroll event -

-
I am programming a simple C # application, and I need a Scallow event on the list view. So I inherited the original ListView class created in ListviewEx witch. I found out how to locate the scroll message from WinAPI and I modified the WndProc method. Now I have this WndProc: protected override zero WndProc (Ref message message) {base.WndProc (Ref I); If (m.msg == WM_VSCROLL) {onScroll (This, New EventArgs ()); }} But the problem is, I do not know how to know about scrolling information. This data should be in wParam, but there is a LOWORD macro ++ like in C in C # and I switch to find the criteria like SB_ below, SB_ENDSCROLL, SB_PAGEUP etc. there any way Need to change the LOWORD macro from C #? Or any other way to find the necessary parameters about scrolling? You can define the WParam constants as the following: Private const int WM_HSCROLL = 0x114; Private Constant WM_VSCROLL = 0x115; Private contact int SBHOZZ = 0; Private Consultant SB_VERT = 1; Private Con...
Read more

PHP - get image from byte array -

-
I am trying to create a back-end for my mobile application. I am sending the content of an image in the body of the HTTP request (output stream) as a byte array, I want to read this stream of bytes in PHP scripts and take back an image. Can anyone tell me how can I do this? Thank you. You can obtain the request body $ body = Reading from file_get_contents ('php: // input'); What you do with that data Depending on you, you can write the data in a file as you mentioned that this is image data, you can drop the data into the object can do. Another option is to use and load the image.
Read more

Linux Terminal Problem with Non-Canonical Terminal I/O app -

-
I have a small app written in C to run on Linux. Part of the app accepts user-input from keyboard , And it uses non-canonical terminal mode so that it can respond to each keystroke. The section of the code that accepts input is a simple task that is called repeatedly in the loop: char get_input () {char C = 0; Int res = reading (input_tamille, & amp; c, 1); If (RSS == 0) 0 returns; If (res == -1) {/ * snip error handling * /} return c; } It reads a letter from the terminal if there is no input within a given time limit, (c_cc [VTIME] value in the vocabulary structure), read () 0 And get_input () is called again It all works very well, I have recently discovered that if you run this app in a terminal window, and then the app Close the terminal window without ending, the app will not exit Received, but CPU intensive launches into an infinite loop, where the read () returns 0 without waiting continued. So how can I get out of the apple if it runs from the terminal win...
Read more