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web_server.c
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web_server.c
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#include "connection.h"
#include "llist.h"
#include <strings.h>
#include <pthread.h>
#define THREAD_POOL_SIZE 20
pthread_t thread_pool[THREAD_POOL_SIZE];
pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
pthread_cond_t condition_v = PTHREAD_COND_INITIALIZER;
//handle multiple threads
void *thread_function(void *arg){
while (1){
pthread_mutex_lock(&mutex) ;
int *pclient = dequeue();
if (pclient == NULL ){
pthread_cond_wait(&condition_v , &mutex) ;
pclient = dequeue () ;
}
pthread_mutex_unlock(&mutex ) ;
if (pclient != NULL){
int conn_fd = *pclient ;
free(pclient) ;
handle_request(conn_fd);
close(conn_fd);
printf("Closed the connection.\n");
}
}
}
int main(int argc, char *argv[])
{
sem_init(&wrt,0,1);
sem_init(&mutex1,0,1);
int listen_fd, conn_fd;
if ((listen_fd = open_server_connection()) < 0)
{
err_n_die("open_server_connection error.");
}
for (int i=0;i<THREAD_POOL_SIZE;i++){
pthread_create(&thread_pool[i],NULL,thread_function,NULL);
}
while (1) {
struct sockaddr_in client_addr;
socklen_t addr_len = sizeof(client_addr);
//put connection decsription ina linked list
// accept blocks untill an incoming connection arrives
// it returns a "file descriptor" to the connection.
printf("waiting for a connection on port %d\n", SERVER_PORT);
if ((conn_fd = accept(listen_fd, (SA *) &client_addr, (socklen_t *) &addr_len)) < 0) {
err_n_die("accept error.");
}
printf("Connected!\n");
fflush(stdout);
int *pclient = malloc(sizeof(int));
*pclient = conn_fd;
pthread_mutex_lock(&mutex) ;
enqueue(pclient);
pthread_cond_signal(&condition_v ) ;
pthread_mutex_unlock(&mutex);
}
}