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POPthreads problem and a few questions
 

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  1. POPthreads problem and a few questions
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    <pre><code>#include&lt;pthread.h&gt; #include&lt;stdio.h&gt; #include&lt;stdlib.h&gt; #include&lt;time.h&gt; #define NUM_THREADS 8 char *messages[NUM_THREADS]; struct thread_data { int thread_id; int sum; char *message; }; struct thread_data thread_data_array[NUM_THREADS]; void *PrintHello(void *threadarg) { int taskid, sum; char *hello_msg; struct thread_data *my_data; sleep(1); my_data = (struct thread_data *) threadarg; taskid = my_data-&gt;thread_id; sum = my_data-&gt;sum; hello_msg = my_data-&gt;message; printf("Thread %d: %s Sum=%d\n", taskid, hello_msg, sum); pthread_exit(NULL); } int main(int argc, char *argv[]) { pthread_t threads[NUM_THREADS]; //int *taskids[NUM_THREADS]; int rc, t, sum; sum=0; messages[0] = "English: Hello World!"; messages[1] = "French: Bonjour, le monde!"; messages[2] = "Spanish: Hola al mundo"; messages[3] = "Klingon: Nuq neH!"; messages[4] = "German: Guten Tag, Welt!"; messages[5] = "Russian: Zdravstvytye, mir!"; messages[6] = "Japan: Sekai e konnichiwa!"; messages[7] = "Latin: Orbis, te saluto!"; for(t=0;t&lt;NUM_THREADS;t++) { sum = sum + t; thread_data_array[t].thread_id = t; thread_data_array[t].sum = sum; thread_data_array[t].message = messages[t]; printf("Creating thread %d\n", t); rc = pthread_create(&amp;threads[t], NULL, PrintHello, (void *)&amp;thread_data_array[t]); if (rc) { printf("ERROR; return code from pthread_create() is %d\n", rc); exit(-1); } } pthread_exit(NULL); } </code></pre> <p>The above piece of code gives me a segmentation fault in linux using gcc</p> <p>As a beginner I have a few questions in mind regarding threads</p> <ol> <li>If 3 threads are created simultaneously and if they have to exit then the thread that is created first is exitted at the end?</li> <li>Can the o/p differ every time of a thread creation and termination program and if so why??(I have noticed they do so");</li> </ol>
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    1. COI"ve tried your program in QNX, works perfectly well. Have you tried to compile and run something simple like int main() { printf("Hello world\n"); return 0;} ?
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      1. POPthreads problem and a few questions
      1. USNick Borodulin
 

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