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955 palkovsky 1
/*
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 * Copyright (C) 2006 Ondrej Palkovsky
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * - Redistributions of source code must retain the above copyright
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 *   notice, this list of conditions and the following disclaimer.
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 * - Redistributions in binary form must reproduce the above copyright
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 *   notice, this list of conditions and the following disclaimer in the
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 *   documentation and/or other materials provided with the distribution.
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 * - The name of the author may not be used to endorse or promote products
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 *   derived from this software without specific prior written permission.
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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 */
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#ifndef __IPC_H__
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#define __IPC_H__
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#define IPC_CALL_LEN    2
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/* Flags for calls */
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#define IPC_CALL_ANSWERED    1
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/* Flags for ipc_wait_for_call */
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#define IPC_WAIT_NONBLOCKING 1
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#ifdef KERNEL
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#include <synch/waitq.h>
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#include <synch/spinlock.h>
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#include <adt/list.h>
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#define IPC_MAX_PHONES  16
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typedef struct answerbox answerbox_t;
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typedef struct {
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    link_t list;
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    answerbox_t *callerbox;
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    int flags;
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    __native data[IPC_CALL_LEN];
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} call_t;
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struct answerbox {
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    SPINLOCK_DECLARE(lock);
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    waitq_t wq;
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    link_t connected_phones; /**< Phones connected to this answerbox */
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    link_t calls;            /**< Received calls */
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    link_t dispatched_calls; /* Should be hash table in the future */
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    link_t answers;          /**< Answered calls */
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};
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typedef struct {
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    SPINLOCK_DECLARE(lock);
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    link_t list;
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    answerbox_t *callee;
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} phone_t;
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extern void ipc_create_phonecompany(void);
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extern void ipc_init(void);
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extern call_t * ipc_wait_for_call(answerbox_t *box, int flags);
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extern void ipc_answer(answerbox_t *box, call_t *request);
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extern void ipc_call(phone_t *phone, call_t *request);
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extern void ipc_call_sync(phone_t *phone, call_t *request);
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extern void ipc_phone_destroy(phone_t *phone);
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extern void ipc_phone_init(phone_t *phone, answerbox_t *box);
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extern void ipc_call_free(call_t *call);
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extern call_t * ipc_call_alloc(void);
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void ipc_answerbox_init(answerbox_t *box);
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void ipc_phone_init(phone_t *phone, answerbox_t *box);
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extern answerbox_t *ipc_central_box;
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#endif
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#endif