Pthreads vlakno – C / C++ – Fórum – Programujte.com

Ahoj,

chcel by som v jednom vlakne generovat slova a v druhom, aby raz za cas zapisalo do logu (bud v nejakom intervale napr 10s, alebo ked bude moct), neviem si dat rady uz, program mi vygeneruje par slov a zapise do logu a skonci. Chcel by som aby dosiel na koniec a vygeneroval vsetky slova. Samostatne generovat slova mi ide. 

Vopred Dakujem za rady a pripomienky, niektore detaily v programe mi prepacte, este tam bude viac zmien.

#include <iostream>
#include <fstream>
#include <sstream>
#include <math.h>
#include <time.h>
#include <pthread.h>
#include <stdlib.h>
#include <semaphore.h>

using namespace std;

unsigned long word_counter = 0; //pocitadlo vygenerovanych hesiel
char allowed_characters[] = {'1', '2', '3', '4', '5', '6', '7', '8', '9', '0'};  //znaky pre generovanie hesla
int max_password_lenght = 6;
int size_of_allowed_characters = sizeof(allowed_characters) / sizeof(char);

sem_t mutex;

unsigned long all_possible_passwords_count(){
	unsigned long total_passwords = 0;
	int password_size = max_password_lenght;
	for (int i = password_size; i > 0; i--){
		total_passwords += pow(size_of_allowed_characters, password_size);
		password_size--;
	}
	return total_passwords;
}

void * trace_to_file(void *txt){
	//sem_wait(&mutex);       /* down semaphore */
	ofstream trace;
	trace.open("trace_log.txt", ios::out);

	unsigned long total = all_possible_passwords_count();
	trace << "Total: " << total << endl;
	trace << "Used: " << word_counter << endl;
	trace << "To end: " << total - word_counter << endl;
	trace << "--------------------------------------------" << endl;

	trace.close();
	//sem_post(&mutex);       /* up semaphore */
}

void printout(string text){
	cout << text << endl;
}

void generate_next_word (string word){
	if (word.length() <= max_password_lenght){
		printout(word);
		word_counter++;
		string new_word;
		for (int i = 0; i < size_of_allowed_characters; i++){
			string add_character;
			add_character = allowed_characters[i];
			new_word = word + add_character;
			generate_next_word(new_word);
		}
	}
}

void get_time(){
	time_t rtime;
	  struct tm * timeinfo;
	  time(&rtime);
	  timeinfo = localtime(&rtime);
	  cout << asctime(timeinfo) << endl;
}

void * call_start(void *txt){
	sem_wait(&mutex);       /* down semaphore */
	for (int i = 0; i < size_of_allowed_characters; i++){ //-lpthread
		string word;
		word = allowed_characters[i];
		generate_next_word(word);
	}
	sem_post(&mutex);       /* up semaphore */
}

int main(){

	time_t seconds1, seconds2;
	seconds1 = time(NULL);

	cout << "All possible passwords from array of numbers 0-9 are: " << endl;

	pthread_t vlakno1, vlakno2;
	int v1, v2;

	char pokus1[] = "textikA";

	sem_init(&mutex, 0, 1);      /* initialize mutex to 1 - binary semaphore */
	                                 /* second param = 0 - semaphore is local */

	v1 = pthread_create( &vlakno1, NULL, &call_start, (void*)&pokus1);
	v2 = pthread_create( &vlakno1, NULL, &trace_to_file, (void*)&pokus1);
	pthread_join(vlakno1, NULL);
	pthread_join(vlakno2, NULL);

	sem_destroy(&mutex); /* destroy semaphore */
	exit(0);

	//vypis casu
	seconds2 = time(NULL);
	cout << seconds2-seconds1 << endl;
}

presun vlakno1(call_start) do mainu.

v1 = pthread_create( &vlakno1, ...
v2 = pthread_create( &vlakno1, ... // <-- vlakno2

Chyba je tu:

v1 = pthread_create( &vlakno1,...
v2 = pthread_create( &vlakno1 ---> tu ma byt &vlakno2

Teraz prve vlakno generuje tak ako ma, akurat druhe co zapisuje do logu tam zapise iba 1x, asi niekde budem mat zle semafory, ale neviem prist na to. Ak niekto poradi budem vdacny :)

Ok, problem som vyriesil, mozem ist v klude spat :D

Semafory som odstranil a do logu zapisujem len kym existuje vlakno1.

Este raz vdaka z prispevky.