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/*-------------------------------------------------------------------------
*
* ipc.h--
* POSTGRES inter-process communication definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: ipc.h,v 1.30 1998/09/01 04:38:16 momjian Exp $
*
* NOTES
* This file is very architecture-specific. This stuff should actually
* be factored into the port/ directories.
*
* Some files that would normally need to include only sys/ipc.h must
* instead included this file because on Ultrix, sys/ipc.h is not designed
* to be included multiple times. This file (by virtue of the ifndef IPC_H)
* is.
*-------------------------------------------------------------------------
*/
#ifndef IPC_H
#define IPC_H
#include <sys/types.h>
#include <sys/ipc.h> /* For IPC_PRIVATE */
#include <config.h>
#ifndef HAVE_UNION_SEMUN
union semun
{
int val;
struct semid_ds *buf;
unsigned short *array;
};
#endif
typedef uint16 SystemPortAddress;
/* semaphore definitions */
#define IPCProtection (0600) /* access/modify by user only */
#define IPC_NMAXSEM 25 /* maximum number of semaphores */
#define IpcSemaphoreDefaultStartValue 255
#define IpcSharedLock (-1)
#define IpcExclusiveLock (-255)
#define IpcUnknownStatus (-1)
#define IpcInvalidArgument (-2)
#define IpcSemIdExist (-3)
#define IpcSemIdNotExist (-4)
typedef uint32 IpcSemaphoreKey; /* semaphore key */
typedef int IpcSemaphoreId;
/* shared memory definitions */
#define IpcMemCreationFailed (-1)
#define IpcMemIdGetFailed (-2)
#define IpcMemAttachFailed 0
typedef uint32 IPCKey;
#define PrivateIPCKey IPC_PRIVATE
#define DefaultIPCKey 17317
typedef uint32 IpcMemoryKey; /* shared memory key */
typedef int IpcMemoryId;
/* ipc.c */
extern void proc_exit(int code);
extern void shmem_exit(int code);
extern int on_shmem_exit(void (*function) (), caddr_t arg);
extern int on_proc_exit(void (*function) (), caddr_t arg);
extern void on_exit_reset(void);
extern IpcSemaphoreId IpcSemaphoreCreate(IpcSemaphoreKey semKey,
int semNum, int permission, int semStartValue,
int removeOnExit, int *status);
extern void IpcSemaphoreKill(IpcSemaphoreKey key);
extern void IpcSemaphoreLock(IpcSemaphoreId semId, int sem, int lock);
extern void IpcSemaphoreUnlock(IpcSemaphoreId semId, int sem, int lock);
extern int IpcSemaphoreGetCount(IpcSemaphoreId semId, int sem);
extern int IpcSemaphoreGetValue(IpcSemaphoreId semId, int sem);
extern IpcMemoryId IpcMemoryCreate(IpcMemoryKey memKey, uint32 size,
int permission);
extern IpcMemoryId IpcMemoryIdGet(IpcMemoryKey memKey, uint32 size);
extern char *IpcMemoryAttach(IpcMemoryId memId);
extern void IpcMemoryKill(IpcMemoryKey memKey);
extern void CreateAndInitSLockMemory(IPCKey key);
extern void AttachSLockMemory(IPCKey key);
#ifdef HAS_TEST_AND_SET
#define NSLOCKS 2048
#define NOLOCK 0
#define SHAREDLOCK 1
#define EXCLUSIVELOCK 2
typedef enum _LockId_
{
BUFMGRLOCKID,
LOCKLOCKID,
OIDGENLOCKID,
SHMEMLOCKID,
SHMEMINDEXLOCKID,
LOCKMGRLOCKID,
SINVALLOCKID,
#ifdef STABLE_MEMORY_STORAGE
MMCACHELOCKID,
#endif
PROCSTRUCTLOCKID,
FIRSTFREELOCKID
} _LockId_;
#define MAX_SPINS FIRSTFREELOCKID
typedef struct slock
{
slock_t locklock;
unsigned char flag;
short nshlocks;
slock_t shlock;
slock_t exlock;
slock_t comlock;
struct slock *next;
} SLock;
#else /* HAS_TEST_AND_SET */
typedef enum _LockId_
{
SHMEMLOCKID,
SHMEMINDEXLOCKID,
BUFMGRLOCKID,
LOCKMGRLOCKID,
SINVALLOCKID,
#ifdef STABLE_MEMORY_STORAGE
MMCACHELOCKID,
#endif
PROCSTRUCTLOCKID,
OIDGENLOCKID,
FIRSTFREELOCKID
} _LockId_;
#define MAX_SPINS FIRSTFREELOCKID
#endif /* HAS_TEST_AND_SET */
/*
* the following are originally in ipci.h but the prototypes have circular
* dependencies and most files include both ipci.h and ipc.h anyway, hence
* combined.
*
*/
/*
* Note:
* These must not hash to DefaultIPCKey or PrivateIPCKey.
*/
#define SystemPortAddressGetIPCKey(address) \
(28597 * (address) + 17491)
/*
* these keys are originally numbered from 1 to 12 consecutively but not
* all are used. The unused ones are removed. - ay 4/95.
*/
#define IPCKeyGetBufferMemoryKey(key) \
((key == PrivateIPCKey) ? key : 1 + (key))
#define IPCKeyGetSIBufferMemoryBlock(key) \
((key == PrivateIPCKey) ? key : 7 + (key))
#define IPCKeyGetSLockSharedMemoryKey(key) \
((key == PrivateIPCKey) ? key : 10 + (key))
#define IPCKeyGetSpinLockSemaphoreKey(key) \
((key == PrivateIPCKey) ? key : 11 + (key))
#define IPCKeyGetWaitIOSemaphoreKey(key) \
((key == PrivateIPCKey) ? key : 12 + (key))
/* --------------------------
* NOTE: This macro must always give the highest numbered key as every backend
* process forked off by the postmaster will be trying to acquire a semaphore
* with a unique key value starting at key+14 and incrementing up. Each
* backend uses the current key value then increments it by one.
* --------------------------
*/
#define IPCGetProcessSemaphoreInitKey(key) \
((key == PrivateIPCKey) ? key : 14 + (key))
/* ipci.c */
extern IPCKey SystemPortAddressCreateIPCKey(SystemPortAddress address);
extern void CreateSharedMemoryAndSemaphores(IPCKey key);
extern void AttachSharedMemoryAndSemaphores(IPCKey key);
#endif /* IPC_H */
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