banan-os/userspace/libraries/LibC/include/sys/sem.h

55 lines
1.3 KiB
C

#ifndef _SYS_SEM_H
#define _SYS_SEM_H 1
// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_sem.h.html
#include <sys/cdefs.h>
__BEGIN_DECLS
#define __need_pid_t
#define __need_size_t
#define __need_time_t
#include <sys/types.h>
#include <sys/ipc.h>
#define SEM_UNDO 1
#define GETNCNT 0
#define GETPID 1
#define GETVAL 2
#define GETALL 3
#define GETZCNT 4
#define SETVAL 5
#define SETALL 6
struct semid_ds
{
struct ipc_perm sem_perm; /* Operation permission structure. */
unsigned short sem_nsems; /* Number of semaphores in set. */
time_t sem_otime; /* Last semop() time. */
time_t sem_ctime; /* Last time changed by semctl(). */
};
// FIXME: A semaphore shall be represented by an anonymous structure, which shall include the following members:
// unsigned short semval; /* Semaphore value. */
// pid_t sempid; /* Process ID of last operation. */
// unsigned short semncnt; /* Number of processes waiting for semval to become greater than current value. */
// unsigned short semzcnt; /* Number of processes waiting for semval to become 0. */
struct sembuf
{
unsigned short sem_num; /* Semaphore number. */
short sem_op; /* Semaphore operation. */
short sem_flg; /* Operation flags. */
};
int semctl(int, int, int, ...);
int semget(key_t, int, int);
int semop(int, struct sembuf *, size_t);
__END_DECLS
#endif