Not needed anymore.

src/include/port/darwin/sem.h

-/*-------------------------------------------------------------------------
- *
- * sem.h
- *	  System V Semaphore Emulation
- *
- * Copyright (c) 1999, repas AEG Automation GmbH
- *
- *
- * IDENTIFICATION
- *		 $Header: /cvsroot/pgsql/src/include/port/darwin/Attic/sem.h,v 1.6 2001/11/08 20:37:52 momjian Exp $
- *
- *-------------------------------------------------------------------------
- */
-
-#ifndef _SYS_SEM_H
-#define _SYS_SEM_H
-
-/* #define DEBUG_IPC here if you want to see the shim in action */
-
-#include <sys/ipc.h>
-
-#ifdef __cplusplus
-extern		"C"
-{
-#endif
-
-/*
- *	Semctl Command Definitions.
- */
-
-#define GETNCNT 3				/* get semncnt */
-#define GETPID	4				/* get sempid */
-#define GETVAL	5				/* get semval */
-#define GETALL	6				/* get all semval's */
-#define GETZCNT 7				/* get semzcnt */
-#define SETVAL	8				/* set semval */
-#define SETALL	9				/* set all semval's */
-
-#ifndef ushort_t
-#define ushort_t unsigned int
-#endif
-
-/*
- *	There is one semaphore structure for each semaphore in the system.
- */
-
-struct sem
-{
-	ushort_t	semval;			/* semaphore text map address	*/
-	pid_t		sempid;			/* pid of last operation	*/
-	ushort_t	semncnt;		/* # awaiting semval > cval */
-	ushort_t	semzcnt;		/* # awaiting semval = 0	*/
-};
-
-/*
- * User semaphore template for semop system calls.
- */
-
-struct sembuf
-{
-	ushort_t	sem_num;		/* semaphore #			*/
-	short		sem_op;			/* semaphore operation		*/
-	short		sem_flg;		/* operation flags		*/
-};
-
-extern int	semctl(int semid, int semnum, int cmd, /* ... */ union semun arg);
-extern int	semget(key_t key, int nsems, int semflg);
-extern int	semop(int semid, struct sembuf * sops, size_t nsops);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif   /* _SYS_SEM_H */