FreeBSD/Linux Kernel Cross Reference
sys/ipc/ipc_space.h

     /* 
      * Mach Operating System
      * Copyright (c) 1991,1990,1989 Carnegie Mellon University
      * All Rights Reserved.
      * 
      * Permission to use, copy, modify and distribute this software and its
      * documentation is hereby granted, provided that both the copyright
      * notice and this permission notice appear in all copies of the
      * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     * HISTORY
     * $Log:        ipc_space.h,v $
     * Revision 2.7  91/06/17  15:46:29  jsb
     *      Renamed NORMA conditionals.
     *      [91/06/17  10:45:36  jsb]
     * 
     * Revision 2.6  91/05/14  16:36:57  mrt
     *      Correcting copyright
     * 
     * Revision 2.5  91/03/16  14:48:45  rpd
     *      Added is_growing.
     *      [91/03/04            rpd]
     * 
     * Revision 2.4  91/02/05  17:23:48  mrt
     *      Changed to new Mach copyright
     *      [91/02/01  15:51:32  mrt]
     * 
     * Revision 2.3  90/09/28  16:55:23  jsb
     *      Added NORMA_IPC support.
     *      [90/09/28  14:04:12  jsb]
     * 
     * Revision 2.2  90/06/02  14:51:43  rpd
     *      Created for new IPC.
     *      [90/03/26  21:03:27  rpd]
     * 
     */
    /*
     *      File:   ipc/ipc_space.h
     *      Author: Rich Draves
     *      Date:   1989
     *
     *      Definitions for IPC spaces of capabilities.
     */
    
    #ifndef _IPC_IPC_SPACE_H_
    #define _IPC_IPC_SPACE_H_
    
    #include <mach_ipc_compat.h>
    #include <norma_ipc.h>
    
    #include <mach/boolean.h>
    #include <mach/kern_return.h>
    #include <kern/macro_help.h>
    #include <kern/lock.h>
    #include <kern/zalloc.h>
    #include <ipc/ipc_entry.h>
    #include <ipc/ipc_splay.h>
    
    /*
     *      Every task has a space of IPC capabilities.
     *      IPC operations like send and receive use this space.
     *      IPC kernel calls manipulate the space of the target task.
     *
     *      Every space has a non-NULL is_table with is_table_size entries.
     *      A space may have a NULL is_tree.  is_tree_small records the
     *      number of entries in the tree that, if the table were to grow
     *      to the next larger size, would move from the tree to the table.
     *
     *      is_growing marks when the table is in the process of growing.
     *      When the table is growing, it can't be freed or grown by another
     *      thread, because of krealloc/kmem_realloc's requirements.
     */
    
    typedef unsigned int ipc_space_refs_t;
    
    typedef struct ipc_space {
            decl_simple_lock_data(,is_ref_lock_data)
            ipc_space_refs_t is_references;
    
            decl_simple_lock_data(,is_lock_data)
            boolean_t is_active;            /* is the space alive? */
            boolean_t is_growing;           /* is the space growing? */
            ipc_entry_t is_table;           /* an array of entries */
           ipc_entry_num_t is_table_size;  /* current size of table */
           struct ipc_table_size *is_table_next; /* info for larger table */
           struct ipc_splay_tree is_tree;  /* a splay tree of entries */
           ipc_entry_num_t is_tree_total;  /* number of entries in the tree */
           ipc_entry_num_t is_tree_small;  /* # of small entries in the tree */
           ipc_entry_num_t is_tree_hash;   /* # of hashed entries in the tree */
   
   #if     MACH_IPC_COMPAT
           struct ipc_port *is_notify;     /* notification port */
   #endif  MACH_IPC_COMPAT
   } *ipc_space_t;
   
   #define IS_NULL                 ((ipc_space_t) 0)
   
   extern zone_t ipc_space_zone;
   
   #define is_alloc()              ((ipc_space_t) zalloc(ipc_space_zone))
   #define is_free(is)             zfree(ipc_space_zone, (vm_offset_t) (is))
   
   extern ipc_space_t ipc_space_kernel;
   extern ipc_space_t ipc_space_reply;
   #if     NORMA_IPC
   extern ipc_space_t ipc_space_remote;
   #endif  NORMA_IPC
   
   #define is_ref_lock_init(is)    simple_lock_init(&(is)->is_ref_lock_data)
   
   #define ipc_space_reference_macro(is)                                   \
   MACRO_BEGIN                                                             \
           simple_lock(&(is)->is_ref_lock_data);                           \
           assert((is)->is_references > 0);                                \
           (is)->is_references++;                                          \
           simple_unlock(&(is)->is_ref_lock_data);                         \
   MACRO_END
   
   #define ipc_space_release_macro(is)                                     \
   MACRO_BEGIN                                                             \
           ipc_space_refs_t _refs;                                         \
                                                                           \
           simple_lock(&(is)->is_ref_lock_data);                           \
           assert((is)->is_references > 0);                                \
           _refs = --(is)->is_references;                                  \
           simple_unlock(&(is)->is_ref_lock_data);                         \
                                                                           \
           if (_refs == 0)                                                 \
                   is_free(is);                                            \
   MACRO_END
   
   #define is_lock_init(is)        simple_lock_init(&(is)->is_lock_data)
   
   #define is_read_lock(is)        simple_lock(&(is)->is_lock_data)
   #define is_read_unlock(is)      simple_unlock(&(is)->is_lock_data)
   
   #define is_write_lock(is)       simple_lock(&(is)->is_lock_data)
   #define is_write_lock_try(is)   simple_lock_try(&(is)->is_lock_data)
   #define is_write_unlock(is)     simple_unlock(&(is)->is_lock_data)
   
   #define is_write_to_read_lock(is)
   
   extern void ipc_space_reference(/* ipc_space_t space */);
   extern void ipc_space_release(/* ipc_space_t space */);
   
   #define is_reference(is)        ipc_space_reference(is)
   #define is_release(is)          ipc_space_release(is)
   
   extern kern_return_t
   ipc_space_create(/* ipc_table_size_t, ipc_space_t * */);
   
   extern kern_return_t
   ipc_space_create_special(/* ipc_space_t * */);
   
   extern void
   ipc_space_destroy(/* ipc_space_t */);
   
   #if     MACH_IPC_COMPAT
   
   /*
    *      Routine:        ipc_space_make_notify
    *      Purpose:
    *              Given a space, return a send right for a notification.
    *              May return IP_NULL/IP_DEAD.
    *      Conditions:
    *              The space is locked (read or write) and active.
    *
    *      ipc_port_t
    *      ipc_space_make_notify(space)
    *              ipc_space_t space;
    */
   
   #define ipc_space_make_notify(space)    \
                   ipc_port_copy_send(space->is_notify)
   
   #endif  MACH_IPC_COMPAT
   #endif  _IPC_IPC_SPACE_H_

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