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  1. /*
  2.  * Copyright (C) 2006 Ondrej Palkovsky
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. #ifndef __IPC_H__
  30. #define __IPC_H__
  31.  
  32. #define IPC_CALL_LEN    2
  33.  
  34. /* Flags for calls */
  35. #define IPC_CALL_ANSWERED    1
  36. /* Flags for ipc_wait_for_call */
  37. #define IPC_WAIT_NONBLOCKING 1
  38.  
  39. #ifdef KERNEL
  40.  
  41. #include <synch/waitq.h>
  42. #include <synch/spinlock.h>
  43. #include <adt/list.h>
  44.  
  45. #define IPC_MAX_PHONES  16
  46.  
  47.  
  48. typedef struct answerbox answerbox_t;
  49.  
  50. typedef struct {
  51.     link_t list;
  52.     answerbox_t *callerbox;
  53.     int flags;
  54.     __native data[IPC_CALL_LEN];
  55. } call_t;
  56.  
  57. struct answerbox {
  58.     SPINLOCK_DECLARE(lock);
  59.  
  60.     waitq_t wq;
  61.  
  62.     link_t connected_phones; /**< Phones connected to this answerbox */
  63.     link_t calls;            /**< Received calls */
  64.     link_t dispatched_calls; /* Should be hash table in the future */
  65.  
  66.     link_t answers;          /**< Answered calls */
  67. };
  68.  
  69. typedef struct {
  70.     SPINLOCK_DECLARE(lock);
  71.     link_t list;
  72.     answerbox_t *callee;
  73. } phone_t;
  74.  
  75. extern void ipc_create_phonecompany(void);
  76. extern void ipc_init(void);
  77. extern call_t * ipc_wait_for_call(answerbox_t *box, int flags);
  78. extern void ipc_answer(answerbox_t *box, call_t *request);
  79. extern void ipc_call(phone_t *phone, call_t *request);
  80. extern void ipc_phone_destroy(phone_t *phone);
  81. extern void ipc_phone_init(phone_t *phone, answerbox_t *box);
  82. extern void ipc_call_free(call_t *call);
  83. extern call_t * ipc_call_alloc(void);
  84. void ipc_answerbox_init(answerbox_t *box);
  85. void ipc_phone_init(phone_t *phone, answerbox_t *box);
  86.  
  87. extern answerbox_t *ipc_central_box;
  88.  
  89. #endif
  90.  
  91. #endif
  92.