#include <sys/sem.h>int CreateSemaphore(int );int SemPost( int);int SemWait( int);void DeleteSemaphore( int );int CreateSemaphore(int count ){  int semid;  #if defined(__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)  union semun parm                /* union is defined by including <sys/sem.h>*/  #else  /* according to X/OPEN we have to define it ourselves */  union semun {        int val;                  /* value for SETVAL */        struct semid_ds *buf;     /* buffer for IPC_STAT, IPC_SET */        unsigned short *array;    /* array for GETALL, SETALL */                                  /* Linux specific part: */        struct seminfo *__buf;    /* buffer for IPC_INFO */  } parm;  #endif  semid = semget( IPC_PRIVATE, 1, 0664 | IPC_CREAT | IPC_EXCL );  if( semid < 0 )    return(-1);  parm.val = count;  if( semctl( semid, 0, SETVAL, parm) < 0)  {    DeleteSemaphore( semid );    return(-1);  }  return(semid);}void DeleteSemaphore( int semid ){  semctl( semid, IPC_RMID, 0 );  return;}int SemPost( int semid ){  struct sembuf sem;  sem.sem_num = 0;  sem.sem_op = 1;  sem.sem_flg = 0;  if(semop( semid, &sem, 1 ) == -1 )    return(-1);  else    return(0);}int SemWait( int semid ){  struct sembuf sem;  sem.sem_num = 0;  sem.sem_op = -1;  sem.sem_flg = 0;  if( semop( semid, &sem, 1 ) == -1 )    return(-1);  else    return(0);}