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Unix Threads in C

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How to create threads in a loop (pthread_create)

#include <stdlib.h> #include <stdio.h> #include <pthread.h> int mails = 0; pthread_mutex_t mutex; void* routine() { for (int i = 0; i < 10000000; i++) { pthread_mutex_lock(&mutex); mails++; pthread_mutex_unlock(&mutex); } } int main(int argc, char* argv[]) { pthread_t th[8]; int i; pthread_mutex_init(&mutex, NULL); for (i = 0; i < 8; i++) { if (pthread_create(th + i, NULL, &routine, NULL) != 0) { perror("Failed to create thread"); return 1; } printf("Thread %d has started\n", i); } for (i = 0; i < 8; i++) { if (pthread_join(th[i], NULL) != 0) { return 2; } printf("Thread %d has finished execution\n", i); } pthread_mutex_destroy(&mutex); printf("Number of mails: %d\n", mails); return 0; }