williamr@2: /* $FreeBSD: src/sys/sys/sem.h,v 1.29 2004/11/17 13:12:06 rwatson Exp $ */ williamr@2: /* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ williamr@2: williamr@2: /* williamr@2: *© Portions copyright (c) 2006 Nokia Corporation. All rights reserved. williamr@2: *© Portions copyright (c) 2006 Symbian Software Ltd. All rights reserved. williamr@2: * SVID compatible sem.h file williamr@2: * williamr@2: * Author: Daniel Boulet williamr@2: */ williamr@2: williamr@2: #ifndef _SYS_SEM_H_ williamr@2: #define _SYS_SEM_H_ williamr@2: williamr@2: #include williamr@2: williamr@2: williamr@2: struct sem { williamr@2: u_short semval; /* semaphore value */ williamr@2: pid_t sempid; /* process ID of last operation */ williamr@2: u_short semncnt; /* number of processes waiting for semval williamr@2: to become greater than current value */ williamr@2: u_short semzcnt; /* number of processes waiting for semval williamr@2: to become 0 */ williamr@2: }; williamr@2: williamr@2: struct semid_ds { williamr@2: struct ipc_perm sem_perm; /* operation permission struct */ williamr@2: struct sem *sem_base; /* pointer to first semaphore in set */ williamr@2: unsigned short sem_nsems; /* number of sems in set */ williamr@2: time_t sem_otime; /* last operation time */ williamr@2: long sem_pad1; /* SVABI/386 says I need this here */ williamr@2: time_t sem_ctime; /* last change time */ williamr@2: /* Times measured in secs since */ williamr@2: /* 00:00:00 GMT, Jan. 1, 1970 */ williamr@2: long sem_pad2; /* SVABI/386 says I need this here */ williamr@2: long sem_pad3[4]; /* SVABI/386 says I need this here */ williamr@2: }; williamr@2: williamr@2: /* williamr@2: * semop's sops parameter structure williamr@2: */ williamr@2: struct sembuf { williamr@2: unsigned short sem_num; /* semaphore # */ williamr@2: short sem_op; /* semaphore operation */ williamr@2: short sem_flg; /* operation flags */ williamr@2: }; williamr@2: #define SEM_UNDO 010000 williamr@2: williamr@2: /* williamr@2: * semctl's arg parameter structure williamr@2: */ williamr@2: union semun { williamr@2: int val; /* value for SETVAL */ williamr@2: struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ williamr@2: unsigned short *array; /* array for GETALL & SETALL */ williamr@2: }; williamr@2: williamr@2: /* williamr@2: * commands for semctl williamr@2: */ williamr@2: #define GETNCNT 3 /* Return the value of semncnt {READ} */ williamr@2: #define GETPID 4 /* Return the value of sempid {READ} */ williamr@2: #define GETVAL 5 /* Return the value of semval {READ} */ williamr@2: #define GETALL 6 /* Return semvals into arg.array {READ} */ williamr@2: #define GETZCNT 7 /* Return the value of semzcnt {READ} */ williamr@2: #define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ williamr@2: #define SETALL 9 /* Set semvals from arg.array {ALTER} */ williamr@2: #define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ williamr@2: #define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */ williamr@2: williamr@2: /* williamr@2: * Permissions williamr@2: */ williamr@2: #define SEM_A IPC_W /* alter permission */ williamr@2: #define SEM_R IPC_R /* read permission */ williamr@2: williamr@2: #ifdef _KERNEL williamr@2: williamr@2: /* williamr@2: * semaphore info struct williamr@2: */ williamr@2: struct seminfo { williamr@2: int semmap, /* # of entries in semaphore map */ williamr@2: semmni, /* # of semaphore identifiers */ williamr@2: semmns, /* # of semaphores in system */ williamr@2: semmnu, /* # of undo structures in system */ williamr@2: semmsl, /* max # of semaphores per id */ williamr@2: semopm, /* max # of operations per semop call */ williamr@2: semume, /* max # of undo entries per process */ williamr@2: semusz, /* size in bytes of undo structure */ williamr@2: semvmx, /* semaphore maximum value */ williamr@2: semaem; /* adjust on exit max value */ williamr@2: }; williamr@2: extern struct seminfo seminfo; williamr@2: williamr@2: /* williamr@2: * Kernel wrapper for the user-level structure williamr@2: */ williamr@2: struct semid_kernel { williamr@2: struct semid_ds u; williamr@2: struct label *label; /* MAC framework label */ williamr@2: }; williamr@2: williamr@2: /* internal "mode" bits */ williamr@2: #define SEM_ALLOC 01000 /* semaphore is allocated */ williamr@2: #define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ williamr@2: williamr@2: /* williamr@2: * Process sem_undo vectors at proc exit. williamr@2: */ williamr@2: void semexit(struct proc *p); williamr@2: #endif /* _KERNEL */ williamr@2: williamr@2: #ifndef _KERNEL williamr@2: #include williamr@2: #include williamr@2: williamr@2: #ifndef _SIZE_T_DECLARED williamr@2: typedef __size_t size_t; williamr@2: #define _SIZE_T_DECLARED williamr@2: #endif williamr@2: williamr@2: #ifndef _PID_T_DECLARED williamr@2: typedef __pid_t pid_t; williamr@2: #define _PID_T_DECLARED williamr@2: #endif williamr@2: williamr@2: // FUNCTION PROTOTYPES williamr@2: williamr@2: williamr@2: // FORWARD DECLARATIONS williamr@2: williamr@2: williamr@2: // CLASS/STRUCT/FUNCTION DECLARATION williamr@2: williamr@2: __BEGIN_DECLS williamr@2: williamr@2: /* williamr@2: * Get semaphore identifier using the IPC key generated by ftok. williamr@2: */ williamr@2: williamr@2: IMPORT_C int semget(key_t key, int nsems, int semflg); williamr@2: williamr@2: williamr@2: /* williamr@2: * Perform atomically a user-defined array of semaphore operations on the set of williamr@2: * semaphores associated with the semaphore identifier specified by the argument semid. williamr@2: */ williamr@2: williamr@2: IMPORT_C int semop(int semid, struct sembuf *sops, unsigned nsops); williamr@2: williamr@2: williamr@2: /* williamr@2: * Provides a variety of semaphore control operations as specified by cmd. williamr@2: */ williamr@2: IMPORT_C int semctl(int semid, int semnum, int cmd, ...); williamr@2: williamr@2: williamr@2: __END_DECLS williamr@2: #endif // #ifndef _KERNEL williamr@2: williamr@2: #endif // _SYS_SEM_H_ williamr@2: williamr@2: // End of File