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  ±è¿µ´ë(2003-03-17 02:32:06, Hit : 8195, Vote : 5692
 [POSIX IPC] »ý»êÀÚ/¼ÒºñÀÚ - ¼¼¸¶Æ÷¾î

/***************************************************
*--------------------------------------------------
*   Creat  : 2001. 02. 10  (programed by Cori-Young )
*   Site: http://www.byoneself.co.kr
*   Update :
*--------------------------------------------------
*   Compile : cc -o conpro conpro.c -lpthread -lrt
*--------------------------------------------------
* Machine hardware:   sun4u
* OS version:         5.7
* Processor type:     sparc
* Hardware:           SUNW,Ultra-60
***************************************************/

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

sem_t produced, consumed; /* semaphores */
int n;
main()
{
            pthread_t idprod, idcons; /* ids of threads */
            void *produce(void *);
            void *consume(void *);
            int loopcnt = 5;

            n = 0;
            
            if (sem_init(&consumed, 0, 0) < 0)
            {
                perror("sem_init");
                exit(1);
            }
            if (sem_init(&produced, 0, 1) < 0)
            {
                perror("sem_init");
                exit(1);
            }
            if (pthread_create(&idprod, NULL, produce, (void *)loopcnt) != 0)
            {
                perror("pthread_create");
                exit(1);
            }
            
            if (pthread_create(&idcons, NULL, consume, (void *)loopcnt) != 0)
            {
                perror("pthread_create");
                exit(1);
            }
            (void)pthread_join(idprod, NULL);
            (void)pthread_join(idcons, NULL);
            (void)sem_destroy(&produced);
            (void)sem_destroy(&consumed);
}        

void *produce(void *arg)
{
            int i, loopcnt;
            loopcnt = (int)arg;
            
            for (i=0; i<loopcnt; i++)
            {
                sem_wait(&consumed);
                n++;  /* increment n by 1 */
                sleep(1);
                sem_post(&produced);
        
            }
}      

void *consume(void *arg)
{
            int i, loopcnt;
            loopcnt = (int)arg;
            
            for (i=0; i<loopcnt; i++)
            {
                sem_wait(&produced);
                printf("n is %dn", n); /* print value of n */
                sem_post(&consumed);
    }
}





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