Tags down


Function of retval in pthread_join

By : Steven Porter
Date : July 31 2020, 03:00 PM
it should still fix some issue I'm learning threading in C in OS. I don't know why following code is giving me segmentation fault. Can anyone help me here? I am also confused a bit about how pthread_join uses its argument void ** retval. What is its function? , This is not correct:
code :
int* arg = *((int*)vargp);  
int* arg = (int*) vargp;

Share : facebook icon twitter icon

pthread_join function in c

By : user3325649
Date : March 29 2020, 07:55 AM
will help you Yes that is what pthread_join is meant to do. It has the calling thread wait until the created thread has done its work. If you don't have it, your main thread terminates the whole process before your fn thread had a chance to print.
If for one reason you want to terminate the main thread and keep all other threads of the process running, you'd have to terminate it with pthread_exit, not with a return statement nor with a call to exit.

Why is the return value of pthread_join() not changing with each call to pthread_join()

By : Dennis Betten
Date : March 29 2020, 07:55 AM
may help you . This program works fine if the user enters only 1 number on the command line. It will factor out the prime factors and output them to the console just fine.
code :
pthread_create(&t_id[i], NULL, primeFactors, *(argv+1))

pthread_join void **retval

By : Sergey
Date : March 29 2020, 07:55 AM
like below fixes the issue If you understand that pthread_join() will pick the return value of the thread callback then you should return from it like this
code :
#include <stdio.h>
#include <stdint.h>
#include <pthread.h>

void *
threadHandler(void *data)
    printf("arg: %s\n", (char *) data);
    return (void *) 0;

    pthread_t thread;
    const char *string;
    void *number;

    string = "N";
    if (pthread_create(&thread, NULL, threadHandler, (void *) string) != 0)
        return -1;
    pthread_join(thread, &number);
    printf("%d\n", ((int) (intptr_t) number));
    return 0;

return retval() if retval() -- is there a way to write that in Ruby without the retval function being called twice?

By : reini
Date : March 29 2020, 07:55 AM
To fix the issue you can do Suppose I have this code , Here's another variation of the same thing

glibc pthread_join crash when call pthread_join() twice

By : Bala Murali
Date : March 29 2020, 07:55 AM
wish help you to fix your issue pthread_join calls pthread_detach after the thread has terminated. pthread_detach releases all the threads resources when the thread terminates.
From the documentation of pthread_detach
Related Posts Related Posts :
  • Passing a pointer to place in array
  • What is int a=(i*+3); and how c compiler will execute it?
  • How do I define a structure with variable members based off another member in C?
  • Program instantly stopping in C?
  • Incomplete definition when using struct in header file
  • bsearch() in C giving segmentation fault in new gcc version 7.4.0
  • Why does this factorial function break after a certain point?
  • When is it "allowed" not to free dynamically allocated memory?
  • Hangman Game Bug
  • What is the purpose of listen() in Socket Programming?
  • Why is the function only returning the multiplied value?
  • "Initializer element is not constant" when defining an object as a static member of a function
  • How to completely overwrite output in c
  • Is there a way to interchange mathematical operators in a while or for loop?
  • How do you continue to scan until new line C without using (fgets)
  • How to read a very large dataset from an HDF5 file?
  • Check if an array at a certain index has an uninitialized value in C
  • Pointer of Strings and Integers
  • The difference between atomic_load and __atomic_load?
  • Why does printing a return carriage significantly reduce the rate at which a printf statement executes in C
  • C char pointer get a specific character
  • Segmentation fault when using setenv (C)
  • Why parenthesis are necessary for typecasting in C?
  • Handling Backslash Escape Sequences in C
  • Is there a C snippet that computes overflow-safe addition efficiently without using compiler builtins?
  • Is there a way to avoid code duplication in multiple similar functions?
  • Why doesn't my function to transform letters into uppercase work if I pass in strings as variables?
  • Copying one file to another: scanf keeps looping
  • Can C cope with sub-byte instruction addressing?
  • What does the fdim acronym stand for?
  • How to fix "error: control reaches end of non-void function"?
  • Surprising expansion of variadic GNU C preprocessor macros in the presence of the ## operator
  • Minimum time quantum needed in nanosleep(), usleep() to yield the CPU
  • Is there a fixed point representation available in C or Assembly
  • Why is my program skipping my first loop?
  • Counting the number of characters in C language
  • Valgrind + C: Handling uninitialized pointers without error
  • Reading a string from a file with C. Fopen with w+ mode is not working
  • Why can't char works but int does
  • POSIX message queue connection issue: mq_open No such file or directory
  • Why isn't the "gets()" function declared when I include stdio.h?
  • Finding the maximum and minimum sum of all but 1 integer(s) in a given array
  • struct/constructor/pointer - C programming language
  • C - remove students from an array(array of structure) except 10 with the highest average grade
  • Trouble reading a .txt file and storing into an array
  • how do I get a different result on compiler?
  • Why is it that my pipe does not read in the printf despite replacing stdin?
  • read indefinite amount of integers until one is negative and then print them
  • My second scanf is not working - what can I do?
  • Is output always determined by the %eax register in inline assembly in C?
  • What exactly happens when a character array is initialized with data larger than its size?
  • Ask about char in array
  • In a code segment of Hackerrank it was advised to make the string static. Why isn't the code working without static stri
  • Using rdmsr/rdpmc for branch prediction accuracy
  • How to make a function find the address of the function pointer it's been called by?
  • C - charting a bar graph using 2D array - wont chart negative values
  • Segmentation fault in C
  • Pass String to argument of Syscall in Go
  • envp in execve system call contain nothing execpt of the string" LS_C"
  • Copy a byte to another register in GNU C inline asm, where the compiler chooses registers for both operands
  • shadow
    Privacy Policy - Terms - Contact Us © voile276.org