171 lines
4.1 KiB
C
Executable File
171 lines
4.1 KiB
C
Executable File
/* @(#)sem.h 1.11 90/03/30 SMI; from S5R2 6.1 */
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/*
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* IPC Semaphore Facility.
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*/
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#ifndef _sys_sem_h
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#define _sys_sem_h
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/*
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* Semaphore Operation Flags.
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*/
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#define SEM_UNDO 010000 /* set up adjust on exit entry */
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/*
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* Semctl Command Definitions.
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*/
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#define GETNCNT 3 /* get semncnt */
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#define GETPID 4 /* get sempid */
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#define GETVAL 5 /* get semval */
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#define GETALL 6 /* get all semval's */
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#define GETZCNT 7 /* get semzcnt */
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#define SETVAL 8 /* set semval */
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#define SETALL 9 /* set all semval's */
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/*
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* Structure Definitions.
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*/
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/*
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* There is one semaphore id data structure for each set of semaphores
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* in the system.
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*/
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struct semid_ds {
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struct ipc_perm sem_perm; /* operation permission struct */
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struct sem *sem_base; /* ptr to first semaphore in set */
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ushort sem_nsems; /* # of semaphores in set */
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time_t sem_otime; /* last semop time */
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time_t sem_ctime; /* last change time */
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};
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/*
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* There is one semaphore structure for each semaphore in the system.
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*/
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struct sem {
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ushort semval; /* semaphore text map address */
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short sempid; /* pid of last operation */
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ushort semncnt; /* # awaiting semval > cval */
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ushort semzcnt; /* # awaiting semval = 0 */
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};
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/*
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* User semaphore template for semop system calls.
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*/
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struct sembuf {
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short sem_num; /* semaphore # */
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short sem_op; /* semaphore operation */
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short sem_flg; /* operation flags */
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};
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/*
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* 'arg' argument template for semctl system calls.
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*/
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union semun {
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int val; /* value for SETVAL */
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struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
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ushort *array; /* array for GETALL & SETALL */
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};
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#ifdef KERNEL
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/*
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* Implementation Constants.
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*/
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#define PSEMN (PZERO + 3) /* sleep priority waiting for greater value */
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#define PSEMZ (PZERO + 2) /* sleep priority waiting for zero */
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#define SEMVMX 32767 /* semaphore maximum value */
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#define SEMAEM 16384 /* adjust on exit max value */
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/*
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* Permission Definitions.
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*/
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#define SEM_A 0200 /* alter permission */
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#define SEM_R 0400 /* read permission */
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/*
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* There is one undo structure per process in the system.
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*/
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struct sem_undo {
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struct sem_undo *un_np; /* ptr to next active undo structure */
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short un_cnt; /* # of active entries */
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struct undo {
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short un_aoe; /* adjust on exit values */
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short un_num; /* semaphore # */
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int un_id; /* semid */
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} un_ent[1]; /* (semume) undo entries (one minimum) */
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};
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/*
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* semaphore information structure
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*/
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struct seminfo {
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int semmap, /* # of entries in semaphore map */
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semmni, /* # of semaphore identifiers */
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semmns, /* # of semaphores in system */
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semmnu, /* # of undo structures in system */
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semmsl, /* max # of semaphores per id */
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semopm, /* max # of operations per semop call */
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semume, /* max # of undo entries per process */
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semusz, /* size in bytes of undo structure */
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semvmx, /* semaphore maximum value */
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semaem; /* adjust on exit max value */
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};
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struct seminfo seminfo; /* configuration parameters */
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/*
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* Configuration Parameters
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* These parameters are tuned by editing the system configuration file.
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* The following lines establish the default values.
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*/
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#ifndef SEMMNI
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#define SEMMNI 10 /* # of semaphore identifiers */
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#endif
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#ifndef SEMMNS
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#define SEMMNS 60 /* # of semaphores in system */
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#endif
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#ifndef SEMUME
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#define SEMUME 10 /* max # of undo entries per process */
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#endif
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#ifndef SEMMNU
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#define SEMMNU 30 /* # of undo structures in system */
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#endif
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/* The following parameters are assumed not to require tuning */
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#ifndef SEMMAP
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#define SEMMAP 30 /* # of entries in semaphore map */
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#endif
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#ifndef SEMMSL
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#define SEMMSL SEMMNS /* max # of semaphores per id */
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#endif
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#ifndef SEMOPM
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#define SEMOPM 100 /* max # of operations per semop call */
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#endif
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/* size in bytes of undo structure */
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#define SEMUSZ (sizeof(struct sem_undo)+sizeof(struct undo)*SEMUME)
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/*
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* Structures allocated in machdep.c
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*/
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struct semid_ds *sema; /* semaphore id pool */
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struct sem *sem; /* semaphore pool */
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struct map *semmap; /* semaphore allocation map */
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struct sem_undo **sem_undo; /* per process undo table */
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int *semu; /* undo structure pool */
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#endif KERNEL
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#endif /*!_sys_sem_h*/
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