source: mainline/uspace/lib/c/include/async.h@ 95faa4d

/*
 * 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
 */

#if ((defined(LIBC_IPC_H_)) && (!defined(LIBC_ASYNC_C_)))
#error Do not intermix low-level IPC interface and async framework
#endif

#ifndef LIBC_ASYNC_H_
#define LIBC_ASYNC_H_

#include <ipc/common.h>
#include <fibril.h>
#include <sys/time.h>
#include <atomic.h>
#include <stdbool.h>
#include <abi/proc/task.h>
#include <abi/ddi/irq.h>
#include <abi/ipc/event.h>
#include <abi/ipc/interfaces.h>
#include <abi/cap.h>

typedef sysarg_t aid_t;
typedef sysarg_t port_id_t;

typedef void *(*async_client_data_ctor_t)(void);
typedef void (*async_client_data_dtor_t)(void *);

/** Port connection handler
 *
 * @param chandle  Handle of the incoming call or CAP_NIL if connection
 *                 initiated from inside using async_create_callback_port()
 * @param call     Incoming call or 0 if connection initiated from inside
 *                 using async_create_callback_port()
 * @param arg      Local argument.
 *
 */
typedef void (*async_port_handler_t)(cap_call_handle_t, ipc_call_t *, void *);

/** Notification handler */
typedef void (*async_notification_handler_t)(ipc_call_t *, void *);

/** Exchange management style
 *
 */
typedef enum {
        /** No explicit exchange management
         *
         * Suitable for protocols which use a single
         * IPC message per exchange only.
         *
         */
        EXCHANGE_ATOMIC = 0,

        /** Exchange management via mutual exclusion
         *
         * Suitable for any kind of client/server communication,
         * but can limit parallelism.
         *
         */
        EXCHANGE_SERIALIZE = 1,

        /** Exchange management via phone cloning
         *
         * Suitable for servers which support client
         * data tracking by task hashes and do not
         * mind cloned phones.
         *
         */
        EXCHANGE_PARALLEL = 2
} exch_mgmt_t;

/** Forward declarations */
struct async_exch;
struct async_sess;

typedef struct async_sess async_sess_t;
typedef struct async_exch async_exch_t;

#define async_manager() \
        do { \
                futex_down(&async_futex); \
                fibril_switch(FIBRIL_FROM_DEAD); \
        } while (0)

#define async_get_call(data) \
        async_get_call_timeout(data, 0)

extern cap_call_handle_t async_get_call_timeout(ipc_call_t *, suseconds_t);

/*
 * User-friendly wrappers for async_send_fast() and async_send_slow(). The
 * macros are in the form async_send_m(), where m denotes the number of payload
 * arguments. Each macros chooses between the fast and the slow version based
 * on m.
 */

#define async_send_0(exch, method, dataptr) \
        async_send_fast(exch, method, 0, 0, 0, 0, dataptr)
#define async_send_1(exch, method, arg1, dataptr) \
        async_send_fast(exch, method, arg1, 0, 0, 0, dataptr)
#define async_send_2(exch, method, arg1, arg2, dataptr) \
        async_send_fast(exch, method, arg1, arg2, 0, 0, dataptr)
#define async_send_3(exch, method, arg1, arg2, arg3, dataptr) \
        async_send_fast(exch, method, arg1, arg2, arg3, 0, dataptr)
#define async_send_4(exch, method, arg1, arg2, arg3, arg4, dataptr) \
        async_send_fast(exch, method, arg1, arg2, arg3, arg4, dataptr)
#define async_send_5(exch, method, arg1, arg2, arg3, arg4, arg5, dataptr) \
        async_send_slow(exch, method, arg1, arg2, arg3, arg4, arg5, dataptr)

extern aid_t async_send_fast(async_exch_t *, sysarg_t, sysarg_t, sysarg_t,
    sysarg_t, sysarg_t, ipc_call_t *);
extern aid_t async_send_slow(async_exch_t *, sysarg_t, sysarg_t, sysarg_t,
    sysarg_t, sysarg_t, sysarg_t, ipc_call_t *);

extern void async_wait_for(aid_t, errno_t *);
extern errno_t async_wait_timeout(aid_t, errno_t *, suseconds_t);
extern void async_forget(aid_t);

extern void async_usleep(suseconds_t);
extern void async_sleep(unsigned int);

extern void async_create_manager(void);
extern void async_destroy_manager(void);

extern void async_set_client_data_constructor(async_client_data_ctor_t);
extern void async_set_client_data_destructor(async_client_data_dtor_t);
extern void *async_get_client_data(void);
extern void *async_get_client_data_by_id(task_id_t);
extern void async_put_client_data_by_id(task_id_t);

extern errno_t async_create_port(iface_t, async_port_handler_t, void *,
    port_id_t *);
extern void async_set_fallback_port_handler(async_port_handler_t, void *);
extern errno_t async_create_callback_port(async_exch_t *, iface_t, sysarg_t,
    sysarg_t, async_port_handler_t, void *, port_id_t *);

extern errno_t async_irq_subscribe(int, async_notification_handler_t, void *,
    const irq_code_t *, cap_irq_handle_t *);
extern errno_t async_irq_unsubscribe(cap_irq_handle_t);

extern errno_t async_event_subscribe(event_type_t, async_notification_handler_t,
    void *);
extern errno_t async_event_task_subscribe(event_task_type_t,
    async_notification_handler_t, void *);
extern errno_t async_event_unsubscribe(event_type_t);
extern errno_t async_event_task_unsubscribe(event_task_type_t);
extern errno_t async_event_unmask(event_type_t);
extern errno_t async_event_task_unmask(event_task_type_t);

/*
 * Wrappers for simple communication.
 */

extern void async_msg_0(async_exch_t *, sysarg_t);
extern void async_msg_1(async_exch_t *, sysarg_t, sysarg_t);
extern void async_msg_2(async_exch_t *, sysarg_t, sysarg_t, sysarg_t);
extern void async_msg_3(async_exch_t *, sysarg_t, sysarg_t, sysarg_t, sysarg_t);
extern void async_msg_4(async_exch_t *, sysarg_t, sysarg_t, sysarg_t, sysarg_t,
    sysarg_t);
extern void async_msg_5(async_exch_t *, sysarg_t, sysarg_t, sysarg_t, sysarg_t,
    sysarg_t, sysarg_t);

/*
 * Wrappers for answer routines.
 */

extern errno_t async_answer_0(cap_call_handle_t, errno_t);
extern errno_t async_answer_1(cap_call_handle_t, errno_t, sysarg_t);
extern errno_t async_answer_2(cap_call_handle_t, errno_t, sysarg_t, sysarg_t);
extern errno_t async_answer_3(cap_call_handle_t, errno_t, sysarg_t, sysarg_t,
    sysarg_t);
extern errno_t async_answer_4(cap_call_handle_t, errno_t, sysarg_t, sysarg_t,
    sysarg_t, sysarg_t);
extern errno_t async_answer_5(cap_call_handle_t, errno_t, sysarg_t, sysarg_t,
    sysarg_t, sysarg_t, sysarg_t);

/*
 * Wrappers for forwarding routines.
 */

extern errno_t async_forward_fast(cap_call_handle_t, async_exch_t *, sysarg_t,
    sysarg_t, sysarg_t, unsigned int);
extern errno_t async_forward_slow(cap_call_handle_t, async_exch_t *, sysarg_t,
    sysarg_t, sysarg_t, sysarg_t, sysarg_t, sysarg_t, unsigned int);

/*
 * User-friendly wrappers for async_req_fast() and async_req_slow(). The macros
 * are in the form async_req_m_n(), where m is the number of payload arguments
 * and n is the number of return arguments. The macros decide between the fast
 * and slow verion based on m.
 */

#define async_req_0_0(exch, method) \
        async_req_fast(exch, method, 0, 0, 0, 0, NULL, NULL, NULL, NULL, NULL)
#define async_req_0_1(exch, method, r1) \
        async_req_fast(exch, method, 0, 0, 0, 0, r1, NULL, NULL, NULL, NULL)
#define async_req_0_2(exch, method, r1, r2) \
        async_req_fast(exch, method, 0, 0, 0, 0, r1, r2, NULL, NULL, NULL)
#define async_req_0_3(exch, method, r1, r2, r3) \
        async_req_fast(exch, method, 0, 0, 0, 0, r1, r2, r3, NULL, NULL)
#define async_req_0_4(exch, method, r1, r2, r3, r4) \
        async_req_fast(exch, method, 0, 0, 0, 0, r1, r2, r3, r4, NULL)
#define async_req_0_5(exch, method, r1, r2, r3, r4, r5) \
        async_req_fast(exch, method, 0, 0, 0, 0, r1, r2, r3, r4, r5)

#define async_req_1_0(exch, method, arg1) \
        async_req_fast(exch, method, arg1, 0, 0, 0, NULL, NULL, NULL, NULL, \
            NULL)
#define async_req_1_1(exch, method, arg1, rc1) \
        async_req_fast(exch, method, arg1, 0, 0, 0, rc1, NULL, NULL, NULL, \
            NULL)
#define async_req_1_2(exch, method, arg1, rc1, rc2) \
        async_req_fast(exch, method, arg1, 0, 0, 0, rc1, rc2, NULL, NULL, \
            NULL)
#define async_req_1_3(exch, method, arg1, rc1, rc2, rc3) \
        async_req_fast(exch, method, arg1, 0, 0, 0, rc1, rc2, rc3, NULL, \
            NULL)
#define async_req_1_4(exch, method, arg1, rc1, rc2, rc3, rc4) \
        async_req_fast(exch, method, arg1, 0, 0, 0, rc1, rc2, rc3, rc4, \
            NULL)
#define async_req_1_5(exch, method, arg1, rc1, rc2, rc3, rc4, rc5) \
        async_req_fast(exch, method, arg1, 0, 0, 0, rc1, rc2, rc3, rc4, \
            rc5)

#define async_req_2_0(exch, method, arg1, arg2) \
        async_req_fast(exch, method, arg1, arg2, 0, 0, NULL, NULL, NULL, \
            NULL, NULL)
#define async_req_2_1(exch, method, arg1, arg2, rc1) \
        async_req_fast(exch, method, arg1, arg2, 0, 0, rc1, NULL, NULL, \
            NULL, NULL)
#define async_req_2_2(exch, method, arg1, arg2, rc1, rc2) \
        async_req_fast(exch, method, arg1, arg2, 0, 0, rc1, rc2, NULL, NULL, \
            NULL)
#define async_req_2_3(exch, method, arg1, arg2, rc1, rc2, rc3) \
        async_req_fast(exch, method, arg1, arg2, 0, 0, rc1, rc2, rc3, NULL, \
            NULL)
#define async_req_2_4(exch, method, arg1, arg2, rc1, rc2, rc3, rc4) \
        async_req_fast(exch, method, arg1, arg2, 0, 0, rc1, rc2, rc3, rc4, \
            NULL)
#define async_req_2_5(exch, method, arg1, arg2, rc1, rc2, rc3, rc4, rc5) \
        async_req_fast(exch, method, arg1, arg2, 0, 0, rc1, rc2, rc3, rc4, \
            rc5)

#define async_req_3_0(exch, method, arg1, arg2, arg3) \
        async_req_fast(exch, method, arg1, arg2, arg3, 0, NULL, NULL, NULL, \
            NULL, NULL)
#define async_req_3_1(exch, method, arg1, arg2, arg3, rc1) \
        async_req_fast(exch, method, arg1, arg2, arg3, 0, rc1, NULL, NULL, \
            NULL, NULL)
#define async_req_3_2(exch, method, arg1, arg2, arg3, rc1, rc2) \
        async_req_fast(exch, method, arg1, arg2, arg3, 0, rc1, rc2, NULL, \
            NULL, NULL)
#define async_req_3_3(exch, method, arg1, arg2, arg3, rc1, rc2, rc3) \
        async_req_fast(exch, method, arg1, arg2, arg3, 0, rc1, rc2, rc3, \
            NULL, NULL)
#define async_req_3_4(exch, method, arg1, arg2, arg3, rc1, rc2, rc3, rc4) \
        async_req_fast(exch, method, arg1, arg2, arg3, 0, rc1, rc2, rc3, \
            rc4, NULL)
#define async_req_3_5(exch, method, arg1, arg2, arg3, rc1, rc2, rc3, rc4, \
    rc5) \
        async_req_fast(exch, method, arg1, arg2, arg3, 0, rc1, rc2, rc3, \
            rc4, rc5)

#define async_req_4_0(exch, method, arg1, arg2, arg3, arg4) \
        async_req_fast(exch, method, arg1, arg2, arg3, arg4, NULL, NULL, \
            NULL, NULL, NULL)
#define async_req_4_1(exch, method, arg1, arg2, arg3, arg4, rc1) \
        async_req_fast(exch, method, arg1, arg2, arg3, arg4, rc1, NULL, \
            NULL, NULL, NULL)
#define async_req_4_2(exch, method, arg1, arg2, arg3, arg4, rc1, rc2) \
        async_req_fast(exch, method, arg1, arg2, arg3, arg4, rc1, rc2, NULL, \
            NULL, NULL)
#define async_req_4_3(exch, method, arg1, arg2, arg3, arg4, rc1, rc2, rc3) \
        async_req_fast(exch, method, arg1, arg2, arg3, arg4, rc1, rc2, rc3, \
            NULL, NULL)
#define async_req_4_4(exch, method, arg1, arg2, arg3, arg4, rc1, rc2, rc3, \
    rc4) \
        async_req_fast(exch, method, arg1, arg2, arg3, arg4, rc1, rc2, rc3, \
            rc4, NULL)
#define async_req_4_5(exch, method, arg1, arg2, arg3, arg4, rc1, rc2, rc3, \
    rc4, rc5) \
        async_req_fast(exch, method, arg1, arg2, arg3, arg4, rc1, rc2, rc3, \
            rc4, rc5)

#define async_req_5_0(exch, method, arg1, arg2, arg3, arg4, arg5) \
        async_req_slow(exch, method, arg1, arg2, arg3, arg4, arg5, NULL, \
            NULL, NULL, NULL, NULL)
#define async_req_5_1(exch, method, arg1, arg2, arg3, arg4, arg5, rc1) \
        async_req_slow(exch, method, arg1, arg2, arg3, arg4, arg5, rc1, \
            NULL, NULL, NULL, NULL)
#define async_req_5_2(exch, method, arg1, arg2, arg3, arg4, arg5, rc1, rc2) \
        async_req_slow(exch, method, arg1, arg2, arg3, arg4, arg5, rc1, rc2, \
            NULL, NULL, NULL)
#define async_req_5_3(exch, method, arg1, arg2, arg3, arg4, arg5, rc1, rc2, \
    rc3) \
        async_req_slow(exch, method, arg1, arg2, arg3, arg4, arg5, rc1, rc2, \
            rc3, NULL, NULL)
#define async_req_5_4(exch, method, arg1, arg2, arg3, arg4, arg5, rc1, rc2, \
    rc3, rc4) \
        async_req_slow(exch, method, arg1, arg2, arg3, arg4, arg5, rc1, rc2, \
            rc3, rc4, NULL)
#define async_req_5_5(exch, method, arg1, arg2, arg3, arg4, arg5, rc1, rc2, \
    rc3, rc4, rc5) \
        async_req_slow(exch, method, arg1, arg2, arg3, arg4, arg5, rc1, rc2, \
            rc3, rc4, rc5)

extern errno_t async_req_fast(async_exch_t *, sysarg_t, sysarg_t, sysarg_t,
    sysarg_t, sysarg_t, sysarg_t *, sysarg_t *, sysarg_t *, sysarg_t *,
    sysarg_t *);
extern errno_t async_req_slow(async_exch_t *, sysarg_t, sysarg_t, sysarg_t,
    sysarg_t, sysarg_t, sysarg_t, sysarg_t *, sysarg_t *, sysarg_t *,
    sysarg_t *, sysarg_t *);

extern async_sess_t *async_connect_me_to(exch_mgmt_t, async_exch_t *, sysarg_t,
    sysarg_t, sysarg_t);
extern async_sess_t *async_connect_me_to_iface(async_exch_t *, iface_t,
    sysarg_t, sysarg_t);
extern async_sess_t *async_connect_me_to_blocking(exch_mgmt_t, async_exch_t *,
    sysarg_t, sysarg_t, sysarg_t);
extern async_sess_t *async_connect_me_to_blocking_iface(async_exch_t *, iface_t,
    sysarg_t, sysarg_t);
extern async_sess_t *async_connect_kbox(task_id_t);

extern errno_t async_connect_to_me(async_exch_t *, sysarg_t, sysarg_t, sysarg_t);

extern errno_t async_hangup(async_sess_t *);
extern void async_poke(void);

extern async_exch_t *async_exchange_begin(async_sess_t *);
extern void async_exchange_end(async_exch_t *);

/*
 * FIXME These functions just work around problems with parallel exchange
 * management. Proper solution needs to be implemented.
 */
void async_sess_args_set(async_sess_t *sess, sysarg_t, sysarg_t, sysarg_t);

/*
 * User-friendly wrappers for async_share_in_start().
 */

#define async_share_in_start_0_0(exch, size, dst) \
        async_share_in_start(exch, size, 0, NULL, dst)
#define async_share_in_start_0_1(exch, size, flags, dst) \
        async_share_in_start(exch, size, 0, flags, dst)
#define async_share_in_start_1_0(exch, size, arg, dst) \
        async_share_in_start(exch, size, arg, NULL, dst)
#define async_share_in_start_1_1(exch, size, arg, flags, dst) \
        async_share_in_start(exch, size, arg, flags, dst)

extern errno_t async_share_in_start(async_exch_t *, size_t, sysarg_t,
    unsigned int *, void **);
extern bool async_share_in_receive(cap_call_handle_t *, size_t *);
extern errno_t async_share_in_finalize(cap_call_handle_t, void *, unsigned int);

extern errno_t async_share_out_start(async_exch_t *, void *, unsigned int);
extern bool async_share_out_receive(cap_call_handle_t *, size_t *,
    unsigned int *);
extern errno_t async_share_out_finalize(cap_call_handle_t, void **);

/*
 * User-friendly wrappers for async_data_read_forward_fast().
 */

#define async_data_read_forward_0_0(exch, method, answer) \
        async_data_read_forward_fast(exch, method, 0, 0, 0, 0, NULL)
#define async_data_read_forward_0_1(exch, method, answer) \
        async_data_read_forward_fast(exch, method, 0, 0, 0, 0, answer)
#define async_data_read_forward_1_0(exch, method, arg1, answer) \
        async_data_read_forward_fast(exch, method, arg1, 0, 0, 0, NULL)
#define async_data_read_forward_1_1(exch, method, arg1, answer) \
        async_data_read_forward_fast(exch, method, arg1, 0, 0, 0, answer)
#define async_data_read_forward_2_0(exch, method, arg1, arg2, answer) \
        async_data_read_forward_fast(exch, method, arg1, arg2, 0, 0, NULL)
#define async_data_read_forward_2_1(exch, method, arg1, arg2, answer) \
        async_data_read_forward_fast(exch, method, arg1, arg2, 0, 0, answer)
#define async_data_read_forward_3_0(exch, method, arg1, arg2, arg3, answer) \
        async_data_read_forward_fast(exch, method, arg1, arg2, arg3, 0, NULL)
#define async_data_read_forward_3_1(exch, method, arg1, arg2, arg3, answer) \
        async_data_read_forward_fast(exch, method, arg1, arg2, arg3, 0, \
            answer)
#define async_data_read_forward_4_0(exch, method, arg1, arg2, arg3, arg4, \
    answer) \
        async_data_read_forward_fast(exch, method, arg1, arg2, arg3, arg4, \
            NULL)
#define async_data_read_forward_4_1(exch, method, arg1, arg2, arg3, arg4, \
    answer) \
        async_data_read_forward_fast(exch, method, arg1, arg2, arg3, arg4, \
            answer)

extern aid_t async_data_read(async_exch_t *, void *, size_t, ipc_call_t *);
extern errno_t async_data_read_start(async_exch_t *, void *, size_t);
extern bool async_data_read_receive(cap_call_handle_t *, size_t *);
extern bool async_data_read_receive_call(cap_call_handle_t *, ipc_call_t *,
    size_t *);
extern errno_t async_data_read_finalize(cap_call_handle_t, const void *,
    size_t);

extern errno_t async_data_read_forward_fast(async_exch_t *, sysarg_t, sysarg_t,
    sysarg_t, sysarg_t, sysarg_t, ipc_call_t *);

/*
 * User-friendly wrappers for async_data_write_forward_fast().
 */

#define async_data_write_forward_0_0(exch, method, answer) \
        async_data_write_forward_fast(exch, method, 0, 0, 0, 0, NULL)
#define async_data_write_forward_0_1(exch, method, answer) \
        async_data_write_forward_fast(exch, method, 0, 0, 0, 0, answer)
#define async_data_write_forward_1_0(exch, method, arg1, answer) \
        async_data_write_forward_fast(exch, method, arg1, 0, 0, 0, NULL)
#define async_data_write_forward_1_1(exch, method, arg1, answer) \
        async_data_write_forward_fast(exch, method, arg1, 0, 0, 0, answer)
#define async_data_write_forward_2_0(exch, method, arg1, arg2, answer) \
        async_data_write_forward_fast(exch, method, arg1, arg2, 0, 0, NULL)
#define async_data_write_forward_2_1(exch, method, arg1, arg2, answer) \
        async_data_write_forward_fast(exch, method, arg1, arg2, 0, 0, answer)
#define async_data_write_forward_3_0(exch, method, arg1, arg2, arg3, answer) \
        async_data_write_forward_fast(exch, method, arg1, arg2, arg3, 0, \
            NULL)
#define async_data_write_forward_3_1(exch, method, arg1, arg2, arg3, answer) \
        async_data_write_forward_fast(exch, method, arg1, arg2, arg3, 0, \
            answer)
#define async_data_write_forward_4_0(exch, method, arg1, arg2, arg3, arg4, \
    answer) \
        async_data_write_forward_fast(exch, method, arg1, arg2, arg3, arg4, \
            NULL)
#define async_data_write_forward_4_1(exch, method, arg1, arg2, arg3, arg4, \
    answer) \
        async_data_write_forward_fast(exch, method, arg1, arg2, arg3, arg4, \
            answer)

extern errno_t async_data_write_start(async_exch_t *, const void *, size_t);
extern bool async_data_write_receive(cap_call_handle_t *, size_t *);
extern bool async_data_write_receive_call(cap_call_handle_t *, ipc_call_t *,
    size_t *);
extern errno_t async_data_write_finalize(cap_call_handle_t, void *, size_t);

extern errno_t async_data_write_accept(void **, const bool, const size_t,
    const size_t, const size_t, size_t *);
extern void async_data_write_void(errno_t);

extern errno_t async_data_write_forward_fast(async_exch_t *, sysarg_t, sysarg_t,
    sysarg_t, sysarg_t, sysarg_t, ipc_call_t *);

extern async_sess_t *async_callback_receive(exch_mgmt_t);
extern async_sess_t *async_callback_receive_start(exch_mgmt_t, ipc_call_t *);

extern errno_t async_state_change_start(async_exch_t *, sysarg_t, sysarg_t,
    sysarg_t, async_exch_t *);
extern bool async_state_change_receive(cap_call_handle_t *, sysarg_t *,
    sysarg_t *, sysarg_t *);
extern errno_t async_state_change_finalize(cap_call_handle_t, async_exch_t *);

extern void *async_remote_state_acquire(async_sess_t *);
extern void async_remote_state_update(async_sess_t *, void *);
extern void async_remote_state_release(async_sess_t *);
extern void async_remote_state_release_exchange(async_exch_t *);

extern void *async_as_area_create(void *, size_t, unsigned int, async_sess_t *,
    sysarg_t, sysarg_t, sysarg_t);

struct async_call_data;

typedef errno_t (*async_call_finalizer_t)(struct async_call_data *);

typedef struct async_call_data {
        // public
        ipc_call_t answer;

        // private
        link_t link;
        void *arg1;
        void *arg2;
        aid_t msgid;
        async_call_finalizer_t finalizer;
} async_call_data_t;

typedef struct async_call {
        // public
        async_call_data_t initial;

        // private
        list_t fragments;
        async_exch_t *exch;
        errno_t rc;
} async_call_t;

extern void async_call_begin(async_call_t *, async_sess_t *, sysarg_t,
    sysarg_t, sysarg_t, sysarg_t, sysarg_t);

// Waits for all in-flight fragments to finish, and ends the call.
extern errno_t async_call_finish(async_call_t *);
extern errno_t async_call_finish_timeout(async_call_t *, const struct timeval *);

// Aborts the call. After this function returns, auxiliary structures
// and buffers are safe to deallocate.
// TODO: might need some extra support from kernel
extern void async_call_abort(async_call_t *);

// Waits for all in-flight fragments to finish, but doesn't end the call.
extern errno_t async_call_wait(async_call_t *);
extern errno_t async_call_wait_timeout(async_call_t *, const struct timeval *);

extern void async_call_method_with_finalizer(async_call_t *,
    async_call_data_t *, sysarg_t, sysarg_t, sysarg_t, sysarg_t, sysarg_t,
    async_call_finalizer_t);
extern void async_call_method(async_call_t *, async_call_data_t *, sysarg_t,
    sysarg_t, sysarg_t, sysarg_t, sysarg_t);

extern void async_call_read(async_call_t *, async_call_data_t *,
    void *, size_t, size_t *);
extern void async_call_write(async_call_t *, async_call_data_t *,
    const void *, size_t, size_t *);

extern void async_call_share_in(async_call_t *, async_call_data_t *,
    size_t, sysarg_t, unsigned int *, void **);
extern void async_call_share_out(async_call_t *, async_call_data_t *,
    void *, unsigned int);

extern void async_call_connect_to_me(async_call_t *, async_call_data_t *,
    sysarg_t, sysarg_t, sysarg_t);

// TODO: connect me to, connect to me, vfs handle, etc.

#endif

/** @}
 */