source: mainline/uspace/lib/c/generic/private/async.h@ b76a7329

/*
 * Copyright (c) 2006 Ondrej Palkovsky
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/** @addtogroup libc
 * @{
 */
/** @file
 */

#ifndef LIBC_PRIVATE_ASYNC_H_
#define LIBC_PRIVATE_ASYNC_H_

#include <async.h>
#include <adt/list.h>
#include <fibril.h>
#include <fibril_synch.h>
#include <sys/time.h>
#include <bool.h>

/** Session data */
struct _async_sess {
        /** List of inactive exchanges */
        list_t exch_list;
        
        /** Exchange management style */
        exch_mgmt_t mgmt;
        
        /** Session identification */
        int phone;
        
        /** First clone connection argument */
        sysarg_t arg1;
        
        /** Second clone connection argument */
        sysarg_t arg2;
        
        /** Third clone connection argument */
        sysarg_t arg3;
        
        /** Exchange mutex */
        fibril_mutex_t mutex;
        
        /** Number of opened exchanges */
        atomic_t refcnt;
};

/** Exchange data */
struct _async_exch {
        /** Link into list of inactive exchanges */
        link_t sess_link;
        
        /** Link into global list of inactive exchanges */
        link_t global_link;
        
        /** Session pointer */
        async_sess_t *sess;
        
        /** Exchange identification */
        int phone;
};

/** Structures of this type are used to track the timeout events. */
typedef struct {
        /** If true, this struct is in the timeout list. */
        bool inlist;
        
        /** Timeout list link. */
        link_t link;
        
        /** If true, we have timed out. */
        bool occurred;
        
        /** Expiration time. */
        struct timeval expires;
} to_event_t;

/** Structures of this type are used to track the wakeup events. */
typedef struct {
        /** If true, this struct is in a synchronization object wait queue. */
        bool inlist;
        
        /** Wait queue linkage. */
        link_t link;
} wu_event_t;

/** Structures of this type represent a waiting fibril. */
typedef struct {
        /** Identification of and link to the waiting fibril. */
        fid_t fid;
        
        /** If true, this fibril is currently active. */
        bool active;
        
        /** Timeout wait data. */
        to_event_t to_event;
        /** Wakeup wait data. */
        wu_event_t wu_event;
} awaiter_t;

/** Message data */
typedef struct {
        awaiter_t wdata;
        
        /** If reply was received. */
        bool done;
        
        /** Pointer to where the answer data is stored. */
        ipc_call_t *dataptr;
        
        sysarg_t retval;
} amsg_t;

extern void __async_init(void);
extern void async_insert_timeout(awaiter_t *);
extern void reply_received(void *, int, ipc_call_t *);

#endif

/** @}
 */