logo
down
shadow

In C, can we read from pipes without busywaiting, may be using callbacks or other ways?


In C, can we read from pipes without busywaiting, may be using callbacks or other ways?

Content Index :

In C, can we read from pipes without busywaiting, may be using callbacks or other ways?
Tag : c , By : ezzze
Date : November 28 2020, 11:01 PM

Hope that helps In your code, you haven't set your pipe to non-blocking mode (at least, I assume you haven't, since you don't actually show how you're opening it), and so read() is doing a blocking read. That is, if there is no data available, but some process still has the pipe open for writing, then it will automatically pause your process until more data is available (and will then read that data into the buffer).
Thus, your code works just fine as it is, and there's no need to change it.

Comments
No Comments Right Now !

Boards Message :
You Must Login Or Sign Up to Add Your Comments .

Share : facebook icon twitter icon

Pipes and callbacks in Haskell


Tag : haskell , By : Tom
Date : March 29 2020, 07:55 AM
Does that help The simplest solution is to use MVars to communicate between the callback and Producer. Here's how:
import Control.Proxy
import Control.Concurrent.MVar

fromMVar :: (Proxy p) => MVar (Maybe a) -> () -> Producer p a IO ()
fromMVar mvar () = runIdentityP loop where
    loop = do
        ma <- lift $ takeMVar mvar
        case ma of
            Nothing -> return ()
            Just a  -> do
                respond a
                loop
>>> mvar <- newEmptyMVar :: IO (MVar (Maybe Int))
>>> forkIO $ runProxy $ fromMVar mvar >-> printD
>>> putMVar mvar (Just 1)
1
>>> putMVar mvar (Just 2)
2
>>> putMVar mvar Nothing
>>> putMVar mvar (Just 3)
>>>

Differences between 2 ways of Rails module included callbacks?


Tag : ruby-on-rails , By : tommy
Date : March 29 2020, 07:55 AM
will help you I'm new to Rails. I have a model called AdvItem, basically what I want to do is to move all its validation statements to a module named AdvItemValidation. After some searches here's what I get: , The form below
def self.included(base)

Two callbacks separated by double pipes?


Tag : javascript , By : Trevor Cortez
Date : March 29 2020, 07:55 AM
This might help you The || operand means "OR", that is, use the success callback if it exists, OR if it does not exist, use onSuccess.

Difference between 2 ways working with pipes using ARGF?


Tag : ruby , By : jedameron
Date : March 29 2020, 07:55 AM
may help you . As Stefan mentioned, you did a little mistake in second case. Proper way of using "ARGF.gets" approach in your case will look like:
while input = ARGF.gets
  # input here represents a line
end
print while gets

Is there a difference between this two ways of doing callbacks (jQuery)?


Tag : jquery , By : PaulPlum
Date : March 29 2020, 07:55 AM
This might help you I'm just starting to learn jQuery and I've seen this. I don't know if there is any difference or which one would be better. , The callback to .fadeOut call fires when fade out finishes. So this
myDiv.fadeOut('fast', function() {
    myDiv.removeClass('slide');
});
myDiv.fadeOut('fast').removeClass('slide');
Related Posts Related QUESTIONS :
  • GTK character count vs byte index
  • Summing up integers in an array and storing the result in an array
  • JITtting with limited knowledge of the target architecture
  • Why does global pointers behave erratically in this function?
  • Write a basic half pyramid pattern program
  • Read memory in C
  • void affecting output of the program
  • How to limit scanf while reading input from file
  • Why does the C runtime not call my exit()?
  • Can anyone say why the array is not changed when passed to a function
  • Integer overflow (Smallest file size that will make the integer in program become negative in bits)
  • Array of pointers to strings(base type of pointers)
  • Is there any way to limit integer datatype value range
  • How to print 2-byte unicode characters
  • The execution of open when using O_CREAT
  • Parsing Command Line Arguments for Shell
  • Undefined length of character arrays
  • Do condition formats in if/else if statements have to match in C?
  • Generate ordered passwords for brute forcing in C
  • Problems with pointer into structure
  • Why does this C program print output "10" irrespective of the for loop?
  • taking output 2D array in matrix form
  • sizeof char pointer and pointer to pointer
  • does the following program cause memory leak?
  • Innacurate file readings from fopen and/or fscanf
  • Searching an element in an Array using Recursive Function in C Language
  • Most fastest C code to count recursively directories in Linux ( without files )
  • Why does C not offer syntactically transparent references like C++ and Java do?
  • Code doesn't get excuted after using continue in while loop
  • How can I maintain correlation between structure definitions and their construction / destruction code?
  • Avoid race conditions when using pointers and threads
  • Binary and Decimal converting
  • How to create input tensors and use with interpreter in Tensorflow Lite (experimental C API)?
  • Unexpected typecasting between values in C
  • Trouble with Forking Process and Calling bc using execve
  • Glib Threads vs GMain Loop Eventing
  • Why does the byte sequence turn when I cast a char array to an integer array?
  • Is there any difference usage in external interrupt between GPIO (AHB bus)and those (APB bus)?
  • Trouble programming AVR to interpret input from Arduino rotary encoder module
  • Is it correct to use a do-while loop inside a for loop? Why and why not?
  • Why we can't use dot for new created pointers to structs
  • Atomicity of fprintf from MPI processes
  • Printing of negative value in c via printf
  • What's the difference between global or local variables regarding the main function?
  • movsd from memory to xmm0 in c x86-64 jit
  • Problem with a function that insert the content of a csv into an array of struct
  • Segmentation Fault running time on sem_post(flag)
  • Extracting values from an incoming bluetooth serial on an arduino
  • "How much memory space does an array takes if the maximum size that is declared is not used?"
  • C GTK2 frustrated with gnome documentation
  • What really happens when a dynamic memory allocation is explicitly converted to struct type?
  • Re-Indexing Bits Within a Char
  • pointer de-referencing balagurusamy
  • Is it safe to memcpy regex_t?
  • Find a tight upper bound on complexity of the below program:
  • FFTW results differ from FFT in MATLAB
  • How to fix Misra 2012 violation , " Assignment operation in expression "
  • What is the difference between "int *p =0;" and "int *p; *p=0;"
  • Strncpy gives unwanted characters at end of string
  • What is really happening behind when a constant is assigned to a pointer variable?
  • shadow
    Privacy Policy - Terms - Contact Us © scrbit.com