68 lines
1.4 KiB
C
68 lines
1.4 KiB
C
/*
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* pthreads3.c - Shows how to pass parameter values to thread routines
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*/
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#include <pthread.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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// Function to check if a number is prime
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// Returns 1 if prime, 0 if not prime
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int is_prime(int v)
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{
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for (int i = 2; i < v; i++)
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{
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if (v % i == 0)
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{
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return 0;
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}
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}
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return 1;
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}
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// Thread routine
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// calls is_prime to check if the input argument is prime
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//
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// NOTE: that parameters and return value are pointers
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void *thread_routine(void *args)
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{
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int *val = args;
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if (is_prime(*val))
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{
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printf("THREAD %lu FOUND that %d is prime\n", pthread_self(), *val);
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}
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else
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{
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printf("THREAD %lu FOUND that %d is not prime\n", pthread_self(), *val);
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}
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return NULL;
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}
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int main()
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{
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int val1 = 2;
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int val2 = 100;
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// Create 2 threads, passing a different value to each
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pthread_t thr1;
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pthread_t thr2;
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if (pthread_create(&thr1, NULL, thread_routine, &val1) == -1)
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{
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printf("COULD NOT CREATE A THREAD\n");
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exit(EXIT_FAILURE);
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}
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if (pthread_create(&thr2, NULL, thread_routine, &val2) == -1)
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{
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printf("COULD NOT CREATE A THREAD\n");
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exit(EXIT_FAILURE);
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}
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// Wait for the threads to finish
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pthread_join(thr1, NULL);
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pthread_join(thr2, NULL);
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// Return success
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return 0;
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}
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