The `pthread_join()` function is part of pthread.h used to wait for another thread to finish executing.
A call to pthread_join(t, ...) suspends execution of the caller's thread. It does not return until thread t has finished executing.
Questions tagged [pthread-join]
257 questions
2
votes
1 answer
Segmentation fault (exit code 139) when using pthread_join
I'm doing some first steps with threads on Linux systems, and i have this error which occures on the base of a program that gets some n argument and creates n number of threads.
Here is the important part of the code:
The function the threads should…
argamanza
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2
votes
2 answers
What if thread exit before other thread wait for it(join)?
For example, If I create 3 threads and join them in the same order. If the second thread exit first, then what would happen to the pthread_join. Will the program block until tid1 exits or directly return from pthread_join(&tid2,NULL)?
pthread_t…
user5574376
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2
votes
2 answers
Type-casting void* to long
Is it possible to directly type-caste a void pointer to long without causing a trouble? Below is a little code snippet I extracted from the code here (Example under Pthread Joining section of the page).
{
void *status;
long t;
rc =…
7_R3X
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2
votes
1 answer
pthread_join(thread_id, &res) , if &res is not NULL - is free(res) needed?
I've stumbled across a code example here. The lines that caught my attention (all other lines skipped):
{
...
void *res;
...
s = pthread_join(tinfo[tnum].thread_id, &res);
...
free(res); /* Free memory allocated by thread */
} …
tum_
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2
votes
1 answer
pthread_join always causes SIGSEGV
For some reason, pthread_join always causes a SIGSEGV action on my computer when I run with Valgrind. To test this, I ran the following code from https://computing.llnl.gov/tutorials/pthreads/:
/* pthread.c */
#include
#include…
ethanabrooks
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2
votes
1 answer
Call join child pthread in main function
I have the test code:
#include
#include
#include
pthread_t th_worker, th_worker2;
void * worker2(void *data) {
for(int i = 0; i< 1000000; i++){
printf("thread for worker2----%d\n", i);
…
Thtam
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2
votes
3 answers
Assure the execution of every thread
I want to run 4 different threads calling the same method, and I want to make sure that every single run comes from a different running thread.
With the code provided bellow, the method function is ran the expected number of times but it is always…
qwerty
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2
votes
1 answer
Why does pthread_join() not create a deadlock?
Below is the program for which I am expecting the program to go into a deadlock because pthread_join() is a blocking wait on a thread (it is waiting to terminate).
But I see that pthread_join() does not block and returns with failure (35 =…
overexchange
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2
votes
2 answers
Multithreaded messages synchronization
I need to print 2 messages each one in each thread in C and synchronize them.
The one thread prints One and the second prints Two.
So my code is something like that
void printOne(void* empty){
while(1) printf("One ");
}
void printTwo(void*…
user2903752
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2
votes
2 answers
Call pthread_create from outside main function
I want to do something like this:
void *do_work_son(void *data)
{
mystruct *d = (mystruct*)data;
while(true)
{
// d->whatever is corrupt
}
}
void start_thread(pthread_t *mt)
{
mystruct data = ...;
…
user67416
2
votes
1 answer
Android/Linux thread join with timeout
Is there a pthreads API call that can do something simlar to pthread_join() but with a timeout? I'm looking for a function that is similar to the Windows WaitForSingleObject(HANDLE handle, int timeout) function. I know that there's a…
Android Noob
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2
votes
2 answers
Pthreads, confusion with pthread_join(pthread_t, void**)
I can't understand why does pthread_join takes as 2nd argument void** for the return value, whereas pthread_exit, which is given the return value, has the return value argument as void*.
Rampal Chaudhary
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vote
1 answer
why pthread_join didn't block its calling thread
I am learning how to use , and the textbook says that:
The pthread_join function blocks the calling thread ...
But in my test, it didn't:
void *a_thread(void *pt) {
puts("a_thread:join");
pthread_join(*(pthread_t *)pt, NULL); // <--…
shynur
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1
vote
1 answer
Segfault when passing pthread a function pointer that takes another function pointer as a parameter
I'm using bog-standard x86-64 Ubuntu gcc, and obviously there are no compile problems since I can get a segfault.
I'm trying to create a pthread that invokes a function that takes another function based on some previously determined condition. That…
peads
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1
vote
0 answers
How to pass the argument 3 in pthread_create if we have a array and how to become returning values?Prime numbers check
I wanted to know how to get the result like: Number x is prime or Number x is not prime, sure this threaded ex. in 10 parts. How to pass argument 3 if we have an array and how the function checks an array if is prime or not? How can I do that?…
Artani
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