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Unix threads

Post by Lucaci Andrei on Thu Nov 22, 2012 5:07 am

VERSION 1.1 is out! Check below.
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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <unistd.h>
#include <semaphore.h>
#define ON 1
#define OFF 0

typedef struct node{
double value;
int worker;
struct node *next;
}node;

sem_t sm;
pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t avmtx = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t avcond = PTHREAD_COND_INITIALIZER;
pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
node* head;
int max, counter, status, pauseAll;

node* create(int max){
node* head=(node*) malloc(sizeof(node));
head->value=rand();
head->worker=0;
head->next=NULL;
node* temp=head;
int i;
printf("Max:%d\n", max);
for (i=1;i<max;i++){
node* elem=(node*) malloc(sizeof(node));
elem->value=rand();
elem->worker=i;
elem->next=NULL;
temp->next=elem;
temp=temp->next;
}
return head;
}

void print(){
node* it=head;
while(it!=NULL){
printf("Value: %lf\t\t|\t\tWorker: %d\n", it->value, it->worker);
it=it->next;
}
}

void removes(){
while(head!=NULL && head->value<2){
node* it=head->next;
printf("Value: %lf\t\t|\t\tWorker: %d\n", head->value, head->worker);
free(head);
head=it;
}
if (head==NULL) return;
node* it=head;
while(it->next!=NULL){
if (it->next->value<2){
printf("Value: %lf\t\t|\t\tWorker: %d\n", it->next->value, it->next->worker);
node* temp=it->next->next;
free(it->next);
it->next=temp;
}
else it=it->next;
}
}

void sleepy(){
while(pauseAll!=1) usleep(100);
pauseAll=0;
}

void* sqrtList(void* p){
sem_wait(&sm);
int i=*(int*)&p;
node* pointer=head;
while(status==ON && pointer!=NULL){
if (pointer->worker==i){
pthread_rwlock_wrlock(&rw);
counter++;
pthread_rwlock_unlock(&rw);
while(pointer->value>=2)
pointer->value=sqrt(pointer->value);
if (counter==max){
printf("Signaled - end of the list.\n");
pthread_rwlock_wrlock(&rw);
status=OFF;
pthread_rwlock_unlock(&rw);
pthread_cond_signal(&avcond);
}
else if (counter!=0 && counter%5==0){
printf("Signaled - 5 elements.\n");
pthread_cond_signal(&avcond);
}
break;
}
else pointer=pointer->next;
}
sem_post(&sm);
pthread_exit(NULL);
}

void* wite(void* p){
pthread_mutex_lock(&mtx);
while(status==ON){
printf("Waiting for signal: \n");
pthread_cond_wait(&avcond, &mtx);
printf("Signal received.\nDeleted items: \n");
removes();
printf("Items remaining: %d.\n", max-counter);
pauseAll=1;
if(counter==max) break;
}
pthread_mutex_unlock(&mtx);
return NULL;
}

int main(int argc, char* argv[]){
if (sem_init(&sm, 0, 3)<0){
printf("Error at initializing the sempahore.\n");
return 1;
}
srand(time(NULL));
max=atoi(argv[1]);
pthread_t t[max];
pthread_t wt;
head=create(max);
printf("Elements: \n");
print();
status=ON;
counter=0;
int i;
pthread_create(&wt, NULL, wite, NULL);
usleep(1);
for (i=0;i<max;i++){
pthread_create(&t[i], NULL, sqrtList, i);
}
while(status==ON) usleep(1000);
for (i=0;i<max;i++){
pthread_join(t[i], NULL);
}
pthread_join(wt, NULL);
if (head==NULL) printf("List is empty.\n");
else {
printf("workre: %d\n", head->worker);
printf("Remaining itmes in the list: \n");
print();
}
pthread_mutex_destroy(&mtx);
pthread_mutex_destroy(&avmtx);
pthread_cond_destroy(&avcond);
pthread_rwlock_destroy(&rw);
sem_destroy(&sm);
return 0;
}

avatar
Lucaci Andrei
"Tata Lor"


Number of messages : 222
Points : 2266743
Reputation : 1007
Registration date : 2008-08-15
Age : 25
Location : Cluj-Napoca

View user profile http://www.andreil.wgz.ro

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Re: Unix threads

Post by Lucaci Andrei on Fri Nov 23, 2012 4:03 am

Version 1.1
NOTE: I've added the semaphores in the thread-creating loop for an ease on the sqrtList function and I have added some synchronization to the threads, so now they go in order, and the result is swell and welcomed. cheers

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#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <math.h>
#include <pthread.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/sem.h>
#include <unistd.h>
#include <semaphore.h>
#define ON 1
#define OFF 0

typedef struct node{
double value;
int worker;
struct node *next;
}node;

sem_t sm;
pthread_mutex_t mtx = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t avmtx = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t avcond = PTHREAD_COND_INITIALIZER;
pthread_rwlock_t rw = PTHREAD_RWLOCK_INITIALIZER;
node* head;
int max, counter, status, pauseAll;

node* create(int max){
node* head=(node*) malloc(sizeof(node));
head->value=rand();
head->worker=0;
head->next=NULL;
node* temp=head;
int i;
printf("Max:%d\n", max);
for (i=1;i<max;i++){
node* elem=(node*) malloc(sizeof(node));
elem->value=rand();
elem->worker=i;
elem->next=NULL;
temp->next=elem;
temp=temp->next;
}
return head;
}

void print(){
node* it=head;
while(it!=NULL){
printf("Value: %lf\t\t|\t\tWorker: %d\n", it->value, it->worker);
it=it->next;
}
}

void removes(){
while(head!=NULL && head->value<2){
node* it=head->next;
printf("Value: %lf\t\t|\t\tWorker: %d\n", head->value, head->worker);
free(head);
head=it;
}
if (head==NULL) return;
node* it=head;
while(it->next!=NULL){
if (it->next->value<2){
printf("Value: %lf\t\t|\t\tWorker: %d\n", it->next->value, it->next->worker);
node* temp=it->next->next;
free(it->next);
it->next=temp;
}
else it=it->next;
}
}

void sleepy(){
while(pauseAll!=1) usleep(100);
pauseAll=0;
}

void* sqrtList(void* p){
// sem_wait(&sm);
int i=*(int*)&p;
node* pointer=head;
while(status==ON && pointer!=NULL){
if (pointer->worker==i){
pthread_rwlock_wrlock(&rw);
counter++;
pthread_rwlock_unlock(&rw);
while(pointer->value>=2)
pointer->value=sqrt(pointer->value);
if (counter==max){
printf("Signaled - end of the list.\n");
pthread_rwlock_wrlock(&rw);
status=OFF;
pthread_rwlock_unlock(&rw);
pthread_cond_signal(&avcond);
}
else if (counter!=0 && counter%5==0){
printf("Signaled - 5 elements.\n");
pthread_cond_signal(&avcond);
}
break;
}
else pointer=pointer->next;
}
// sem_post(&sm);
pthread_exit(NULL);
}

void* wite(void* p){
pthread_mutex_lock(&mtx);
while(status==ON){
printf("Waiting for signal: \n");
pthread_cond_wait(&avcond, &mtx);
printf("Signal received.\nDeleted items: \n");
removes();
printf("Items remaining: %d.\n", max-counter);
pauseAll=1;
if(counter==max) break;
}
pthread_mutex_unlock(&mtx);
return NULL;
}

int main(int argc, char* argv[]){
if (sem_init(&sm, 0, 3)<0){
printf("Error at initializing the sempahore.\n");
return 1;
}
srand(time(NULL));
max=atoi(argv[1]);
pthread_t t[max];
pthread_t wt;
head=create(max);
printf("Elements: \n");
print();
status=ON;
counter=0;
int i;
pthread_create(&wt, NULL, wite, NULL);
usleep(1);
for (i=0;i<max;i++){
sem_wait(&sm);
usleep(1);
pthread_create(&t[i], NULL, sqrtList, i);
sem_post(&sm);
}
while(status==ON) usleep(1000);
for (i=0;i<max;i++){
pthread_join(t[i], NULL);
}
pthread_join(wt, NULL);
if (head==NULL) printf("List is empty.\n");
else {
printf("workre: %d\n", head->worker);
printf("Remaining itmes in the list: \n");
print();
}
pthread_mutex_destroy(&mtx);
pthread_mutex_destroy(&avmtx);
pthread_cond_destroy(&avcond);
pthread_rwlock_destroy(&rw);
sem_destroy(&sm);
return 0;
}

avatar
Lucaci Andrei
"Tata Lor"


Number of messages : 222
Points : 2266743
Reputation : 1007
Registration date : 2008-08-15
Age : 25
Location : Cluj-Napoca

View user profile http://www.andreil.wgz.ro

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