testthread.c

/*
	Progr. C ce primeste ca argumente nume de fisier si pt. fiecare creeaza un thread
	ce calculeaza dimensiunea lui. La sfarsit se afiseaza maximul dintre dimensiuni.
*/

#include <stdio.h>
#include <unistd.h>
#include <pthread.h>

int max = -1;
pthread_mutex_t lock;

void* getFileSize(void* arg) {
	
//	printf("am primit fisierul %s \n", (char*)arg);
	char* fname = (char*) arg;
	
	if( access( fname, F_OK ) == -1 ) { 
		printf("Nu pot accesa fisierul %s \n", fname);				
		pthread_exit(NULL);
	}
	FILE* f = fopen(fname, "r");
	int size = getSize(f);
	printf("Fisierul %s are dimensiunea %d \n", fname, size);
	
	pthread_mutex_lock(&lock);
	if (size > max) {
		max = size;
	}
	pthread_mutex_unlock(&lock);

	fclose(f);
	pthread_exit(NULL);
}

int getSize(FILE* f) {
	fseek(f, 0L, SEEK_END);
	return ftell(f);
} 
int main (int argc, char* argv[]) {

	pthread_t threads[argc];
	pthread_mutex_init(&lock, NULL);

	int i;
	for (i = 1 ; i < argc ; i ++) {
		//printf("creez threadul %d cu arg %s \n", i, argv[i]);
		pthread_create(&threads[i], NULL, getFileSize, (void*) argv[i]);
	}

	for (i = 1 ; i < argc ; i ++) {
		pthread_join(threads[i], NULL);
	}

	if (max == -1) {
		printf("Nu pot determina maxim, nu am citit nici un fisier");
	}
	else {
		printf("Max = %d \n", max);
	}
}