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Questions tagged [pthread-join]

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.

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Java Multithreading concept and join() method

I'm confused in join() method used in Threads in Java. In the following code: // Using join() to wait for threads to finish. class NewThread implements Runnable { String name; // name of thread Thread t; NewThread(String threadname) { …
user2696258
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Do I need to join every thread in my application ?

I'm new with multi-threading and I need to get the whole idea about the "join" and do I need to join every thread in my application ?, and how does that work with multi-threading ?
Arwa196
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What if thread exits before calling pthread_join

I have a small code void *PrintHello(void *threadid) { cout<<"Hello"<
Sreeraj Chundayil
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A detached pthread causes memory leaks

There is a known memory leak, when terminating a process with running undetached pthreads. However, detaching the thread doesn't seem to be a solution. Consider the following minimal example: #include #include static void*…
Witiko
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when should I use 'lock' in multi-thread programing?

when should I use 'lock' in multi-thread programing? Just lock the area which each thread will modify or lock the area which each thread can access even it will not be modified ? struct share_data { /* share data */ thread_id; } thread 1…
Nick Dong
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Why doesn't multithreading improve performance in this program for finding primes?

Running time is about the same, regardless of the number of threads. I am having trouble figuring out why. I know that the threads are running in parallel as they are supposed to, but I don't have even a good guess as to why there would be no…
amiller3513
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Why one can't do multiple pthread_joins on the same thread?

From https://computing.llnl.gov/tutorials/pthreads/: A joining thread can match one pthread_join() call. It is a logical error to attempt multiple joins on the same thread. Also from "man pthread_join": If multiple threads simultaneously try to…
SHH
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Threads not running parallel

I want to make parallel threads. Example: my output is like: thread1 thread3 thread4 thread2... In main: pthread_t tid; int n=4; int i; for(i=n;i>0;i--){ if(pthread_create(&tid,NULL,thread_routine,&i)){ perror("ERROR"); } …
Nejc Galof
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pthread_join() for asynchronous threads

I have written a simple demonstration program so that I can understand the pthread_join() function. I know how to use the pthread_condition_wait() function to allow asynchronous threading but I'm trying to understand how I can do similar work using…
Kyle Bridenstine
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C - Creating n threads

I am working on the following function. This function should create n threads. Also it should print the tid of the child thread. But at the moment I am little bit confused. When I execute it and for example I create 5 threads, it returns all the…
user2965601
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How do I get the error code from pthread_join()?

The following code fails to join pthreads and the message "join failed" is printed. How do I get more information about the failure and its cause? pthread_t aThread[MAX_LENGTH]; int errCode[MAX_LENGTH]; char returnVal; for(int i = 0; i <…
Celeritas
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How to return a double value from pthread in c++?

After reading this thread: How to return a value from thread in C on how to return an integer value from a pthread I tested to see if it could work for a double, but it didn't. Is there a way to return a double, long or a string from the pthread…
Flame_Phoenix
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pthread Return Values to an Array

I am currently working on a project that uses pthreads. The project so far starts a user specified number of threads and does some work on each thread then closes. Each thread is stored in a dynamically allocated array of memory. I do this…
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How to manage properly pthread

I have some random issues sometimes to join pthread. I can just say that the thread is not stuck in a deadlock with a mutex when the join is failing. Most of the time the thread is idle (sleep syscall) when the timeout occurred on join. My need is…
ArthurLambert
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What is the problem for PTHREAD_CANCELED and thread’s start function return value

I'm reading Kerrisk's book and see that the following as a note, Caution is required when using a cast integer as the return value of a thread’s start function. The reason for this is that PTHREAD_CANCELED, the value returned when a thread is…
Soner from The Ottoman Empire
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