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#include <sys/sem.h>
#include <sys/ipc.h>
#include <stdio.h>
union semun{
int val;
struct semid_ds *buf;
unsigned short *array;
}
main()
{
int semid;
semid=semget(IPC_PRIVATE,2,IPC_CREAT|0666);
union semun sem,sem2;
sem.val=1;
sem2.val=0;
semctl(semid,0,SETVAL,sem);
semctl(semid,1,SETVAL,sem2);
if(fork()==0)
{int i;
struct sembuf sops={0,+1,IPC_NOWAIT},sops2={1,-1,IPC_NOWAIT};
for(i=0;i <1000;i++)
{
semop(semid,&sops,1);
printf("a\n");
semop(semid,&sops2,1);
}
}
else
{
int j;
struct sembuf sops={0,-1,IPC_NOWAIT},sops2={1,+1,IPC_NOWAIT};
for(j=0;j <1000;j++)
{
semop(semid,&sops2,1);
printf("b\n");
semop(semid,&sops,1);
}
}
}

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#include <sys/sem.h>
#include <sys/ipc.h>
#include <stdio.h>
union semun{
int val;
struct semid_ds *buf;
unsigned short *array;
}
main()
{
int semid;
semid=semget(IPC_PRIVATE,2,IPC_CREAT|0666);
union semun sem,sem2;
sem.val=0;