author | William Roberts <williamr@symbian.org> |
Tue, 16 Mar 2010 16:12:26 +0000 | |
branch | Symbian2 |
changeset 2 | 2fe1408b6811 |
parent 0 | 061f57f2323e |
child 4 | 837f303aceeb |
permissions | -rw-r--r-- |
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/* $FreeBSD: src/sys/sys/sem.h,v 1.29 2004/11/17 13:12:06 rwatson Exp $ */ |
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/* $NetBSD: sem.h,v 1.5 1994/06/29 06:45:15 cgd Exp $ */ |
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/* |
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*© Portions copyright (c) 2006 Nokia Corporation. All rights reserved. |
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*© Portions copyright (c) 2006 Symbian Software Ltd. All rights reserved. |
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* SVID compatible sem.h file |
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* |
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* Author: Daniel Boulet |
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*/ |
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#ifndef _SYS_SEM_H_ |
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#define _SYS_SEM_H_ |
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#include <sys/ipc.h> |
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struct sem { |
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u_short semval; /* semaphore value */ |
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pid_t sempid; /* process ID of last operation */ |
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u_short semncnt; /* number of processes waiting for semval |
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to become greater than current value */ |
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u_short semzcnt; /* number of processes waiting for semval |
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to become 0 */ |
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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; /* pointer to first semaphore in set */ |
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unsigned short sem_nsems; /* number of sems in set */ |
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time_t sem_otime; /* last operation time */ |
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long sem_pad1; /* SVABI/386 says I need this here */ |
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time_t sem_ctime; /* last change time */ |
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/* Times measured in secs since */ |
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/* 00:00:00 GMT, Jan. 1, 1970 */ |
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long sem_pad2; /* SVABI/386 says I need this here */ |
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long sem_pad3[4]; /* SVABI/386 says I need this here */ |
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}; |
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/* |
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* semop's sops parameter structure |
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*/ |
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struct sembuf { |
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unsigned 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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#define SEM_UNDO 010000 |
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/* |
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* semctl's arg parameter structure |
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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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unsigned short *array; /* array for GETALL & SETALL */ |
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}; |
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/* |
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* commands for semctl |
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*/ |
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#define GETNCNT 3 /* Return the value of semncnt {READ} */ |
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#define GETPID 4 /* Return the value of sempid {READ} */ |
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#define GETVAL 5 /* Return the value of semval {READ} */ |
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#define GETALL 6 /* Return semvals into arg.array {READ} */ |
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#define GETZCNT 7 /* Return the value of semzcnt {READ} */ |
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#define SETVAL 8 /* Set the value of semval to arg.val {ALTER} */ |
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#define SETALL 9 /* Set semvals from arg.array {ALTER} */ |
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#define SEM_STAT 10 /* Like IPC_STAT but treats semid as sema-index */ |
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#define SEM_INFO 11 /* Like IPC_INFO but treats semid as sema-index */ |
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/* |
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* Permissions |
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*/ |
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#define SEM_A IPC_W /* alter permission */ |
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#define SEM_R IPC_R /* read permission */ |
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#ifdef _KERNEL |
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/* |
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* semaphore info struct |
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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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extern struct seminfo seminfo; |
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/* |
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* Kernel wrapper for the user-level structure |
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*/ |
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struct semid_kernel { |
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struct semid_ds u; |
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struct label *label; /* MAC framework label */ |
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}; |
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/* internal "mode" bits */ |
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#define SEM_ALLOC 01000 /* semaphore is allocated */ |
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#define SEM_DEST 02000 /* semaphore will be destroyed on last detach */ |
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/* |
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* Process sem_undo vectors at proc exit. |
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*/ |
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void semexit(struct proc *p); |
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#endif /* _KERNEL */ |
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#ifndef _KERNEL |
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#include <sys/cdefs.h> |
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#include <sys/_types.h> |
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#ifndef _SIZE_T_DECLARED |
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typedef __size_t size_t; |
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#define _SIZE_T_DECLARED |
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#endif |
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#ifndef _PID_T_DECLARED |
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typedef __pid_t pid_t; |
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#define _PID_T_DECLARED |
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#endif |
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// FUNCTION PROTOTYPES |
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// FORWARD DECLARATIONS |
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// CLASS/STRUCT/FUNCTION DECLARATION |
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__BEGIN_DECLS |
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/* |
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* Get semaphore identifier using the IPC key generated by ftok. |
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*/ |
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IMPORT_C int semget(key_t key, int nsems, int semflg); |
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/* |
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* Perform atomically a user-defined array of semaphore operations on the set of |
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* semaphores associated with the semaphore identifier specified by the argument semid. |
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*/ |
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IMPORT_C int semop(int semid, struct sembuf *sops, unsigned nsops); |
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/* |
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* Provides a variety of semaphore control operations as specified by cmd. |
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*/ |
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IMPORT_C int semctl(int semid, int semnum, int cmd, ...); |
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__END_DECLS |
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#endif // #ifndef _KERNEL |
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#endif // _SYS_SEM_H_ |
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// End of File |