join « pthread « C Q&A

1. thread termination issue (c programming)    stackoverflow.com

I'm working on an application for Linux in C which uses multiple threads. The threads which are spawned by the main function do most of the work, and therefore usually finish ...

2. pthread_exit and/or pthread_join causing Abort and SegFaults    stackoverflow.com

The following code is a simple thread game, that switches between threads causing the timer to decrease. It works fine for 3 threads, causes and Abort(core dumped) for 4 threads, and ...

3. Is it valid to call pthread_join on the main thread?    stackoverflow.com

Is the behavior of this code well-defined?

#include <stdio.h>
#include <pthread.h>

pthread_t mt;

void *start(void *x)
{
    void *y;
    pthread_join(mt, &y);
    printf("joined main thread\n");
    ...

4. pthreads - Join on group of threads, wait for one to exit    stackoverflow.com

In the POSIX thread interface, pthread_join(thread) can be used to block until the specified thread exits. Is there a similar function that will allow execution to block until any child thread exits? This ...

5. Difference between mutex lock and pthread_join    stackoverflow.com

What's the difference between the two? Aren't they the same thing in that they both wait for a thread to finish before executing another thread? I'm trying to understand the following code

#include <stdio.h>
#include ...

6. should we explicitly join a thread to finish    stackoverflow.com

should we explicitly join a thread to finish? I mean is this like process world: when we don't wait for them to finish we got zombie processes.

7. pthread_join on two infinite loop threads?    stackoverflow.com

I just read here that when the main loop ends, any threads that have or have not had a chance to spawn are terminated. So I need to do a ...

8. pthread create and join problems    cboard.cprogramming.com

Code: ************************************************* pthread_exit(NULL); //end of thread_function ************************************************* int res; int lots_of_threads; int num_sites; pthread_t a_thread[5]; void *thread_result; //initialise mutex - used to synchronise linked list between threads res = pthread_mutex_init(&queue_mutex, NULL); if (res != 0){printf("mutex creation failure.\n"); //add multiple threads for(lots_of_threads = 0; lots_of_threads < 5; lots_of_threads++) { //threads are created and started res = pthread_create(&(a_thread[lots_of_threads]), NULL, thread_function, (void *)lots_of_threads); if ...

9. Pthread_join causes a segfault    forums.devshed.com

I'm trying to set up the skeleton for a multithreaded program (in C, obviously...) Below is the code that creates the threads. THe threads are created properly, and execute properly. If I replace the pthread_join code below with a call to sleep(), everything works perfectly, but for some reason pthread_join causes a segfault. Code: matrixInfo matList[m]; matrixInfo *test; pthread_t threadList[m]; int ...

10. Output from thread after pthread_join !? Why??    forums.devshed.com

Hello everybody I fail to understand this artefact at all and I am wondering if someone can help. I'm using Debian etch, gcc 4.2.1 and compiling using the command Code: gcc -Wall -lpthread main.c -o threadtest This is the code: Code: #include #include #include #include #define THREADS 5 typedef struct ii_thdata { pthread_t th_id; pthread_attr_t *th_attr; } ...

11. Understanding and using void * and void ** in pthread_exit and pthread_join    forums.devshed.com

Hi Debian etch, gcc version 4.1.2 I'm having a bit of a problem returning data from a thread. This problem probably extends into a 'what is (void **) ?' question as well. I have one thread retrieving some data off a queue. Another thread (listening thread) receives data and then kicks off another thread (adding thread) to to add to the ...

12. Using/Omitting pthread_join()    daniweb.com