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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.  /** @addtogroup libc
  30.  * @{
  31.  */
  32. /** @file
  33.  */
  34.  
  35. /**
  36.  * Asynchronous library
  37.  *
  38.  * The aim of this library is facilitating writing programs utilizing
  39.  * the asynchronous nature of Helenos IPC, yet using a normal way
  40.  * of programming.
  41.  *
  42.  * You should be able to write very simple multithreaded programs,
  43.  * the async framework will automatically take care of most synchronization
  44.  * problems.
  45.  *
  46.  * Default semantics:
  47.  * - send() - send asynchronously. If the kernel refuses to send more
  48.  *            messages, [ try to get responses from kernel, if nothing
  49.  *            found, might try synchronous ]
  50.  *
  51.  * Example of use:
  52.  *
  53.  * 1) Multithreaded client application
  54.  *  create_thread(thread1);
  55.  *  create_thread(thread2);
  56.  *  ...
  57.  *  
  58.  *  thread1() {
  59.  *        conn = ipc_connect_me_to();
  60.  *        c1 = send(conn);
  61.  *        c2 = send(conn);
  62.  *        wait_for(c1);
  63.  *        wait_for(c2);
  64.  *  }
  65.  *
  66.  *
  67.  * 2) Multithreaded server application
  68.  * main() {
  69.  *      async_manager();
  70.  * }
  71.  *
  72.  *
  73.  * client_connection(icallid, *icall) {
  74.  *       if (want_refuse) {
  75.  *           ipc_answer_fast(icallid, ELIMIT, 0, 0);
  76.  *           return;
  77.  *       }
  78.  *       ipc_answer_fast(icallid, 0, 0, 0);
  79.  *
  80.  *       callid = async_get_call(&call);
  81.  *       handle(callid, call);
  82.  *       ipc_answer_fast(callid, 1,2,3);
  83.  *
  84.  *       callid = async_get_call(&call);
  85.  *       ....
  86.  * }
  87.  *
  88.  * TODO: Detaching/joining dead psthreads?
  89.  */
  90. #include <futex.h>
  91. #include <async.h>
  92. #include <psthread.h>
  93. #include <stdio.h>
  94. #include <libadt/hash_table.h>
  95. #include <libadt/list.h>
  96. #include <ipc/ipc.h>
  97. #include <assert.h>
  98. #include <errno.h>
  99. #include <time.h>
  100. #include <arch/barrier.h>
  101.  
  102. atomic_t async_futex = FUTEX_INITIALIZER;
  103. static hash_table_t conn_hash_table;
  104. static LIST_INITIALIZE(timeout_list);
  105.  
  106. typedef struct {
  107.     struct timeval expires;      /**< Expiration time for waiting thread */
  108.     int inlist;             /**< If true, this struct is in timeout list */
  109.     link_t link;
  110.  
  111.     pstid_t ptid;                /**< Thread waiting for this message */
  112.     int active;                  /**< If this thread is currently active */
  113.     int timedout;                /**< If true, we timed out */
  114. } awaiter_t;
  115.  
  116. typedef struct {
  117.     awaiter_t wdata;
  118.  
  119.     int done;                    /**< If reply was received */
  120.     ipc_call_t *dataptr;         /**< Pointer where the answer data
  121.                       *   is stored */
  122.     ipcarg_t retval;
  123. } amsg_t;
  124.  
  125. typedef struct {
  126.     link_t link;
  127.     ipc_callid_t callid;
  128.     ipc_call_t call;
  129. } msg_t;
  130.  
  131. typedef struct {
  132.     awaiter_t wdata;
  133.  
  134.     link_t link;             /**< Hash table link */
  135.     ipcarg_t in_phone_hash;  /**< Incoming phone hash. */
  136.     link_t msg_queue;        /**< Messages that should be delivered to this thread */
  137.     /* Structures for connection opening packet */
  138.     ipc_callid_t callid;
  139.     ipc_call_t call;
  140.     ipc_callid_t close_callid; /* Identification of closing packet */
  141.     void (*cthread)(ipc_callid_t,ipc_call_t *);
  142. } connection_t;
  143.  
  144. /** Identifier of incoming connection handled by current thread */
  145. __thread connection_t *PS_connection;
  146. /** If true, it is forbidden to use async_req functions and
  147.  *  all preemption is disabled */
  148. __thread int in_interrupt_handler;
  149.  
  150. static void default_client_connection(ipc_callid_t callid, ipc_call_t *call);
  151. static void default_interrupt_received(ipc_callid_t callid, ipc_call_t *call);
  152. static async_client_conn_t client_connection = default_client_connection;
  153. static async_client_conn_t interrupt_received = default_interrupt_received;
  154.  
  155. /** Add microseconds to give timeval */
  156. static void tv_add(struct timeval *tv, suseconds_t usecs)
  157. {
  158.     tv->tv_sec += usecs / 1000000;
  159.     tv->tv_usec += usecs % 1000000;
  160.     if (tv->tv_usec > 1000000) {
  161.         tv->tv_sec++;
  162.         tv->tv_usec -= 1000000;
  163.     }
  164. }
  165.  
  166. /** Subtract 2 timevals, return microseconds difference */
  167. static suseconds_t tv_sub(struct timeval *tv1, struct timeval *tv2)
  168. {
  169.     suseconds_t result;
  170.  
  171.     result = tv1->tv_usec - tv2->tv_usec;
  172.     result += (tv1->tv_sec - tv2->tv_sec) * 1000000;
  173.  
  174.     return result;
  175. }
  176.  
  177. /** Compare timeval
  178.  *
  179.  * @return 1 if tv1 > tv2, otherwise 0
  180.  */
  181. static int tv_gt(struct timeval *tv1, struct timeval *tv2)
  182. {
  183.     if (tv1->tv_sec > tv2->tv_sec)
  184.         return 1;
  185.     if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec > tv2->tv_usec)
  186.         return 1;
  187.     return 0;
  188. }
  189. static int tv_gteq(struct timeval *tv1, struct timeval *tv2)
  190. {
  191.     if (tv1->tv_sec > tv2->tv_sec)
  192.         return 1;
  193.     if (tv1->tv_sec == tv2->tv_sec && tv1->tv_usec >= tv2->tv_usec)
  194.         return 1;
  195.     return 0;
  196. }
  197.  
  198. /* Hash table functions */
  199. #define CONN_HASH_TABLE_CHAINS  32
  200.  
  201. static hash_index_t conn_hash(unsigned long *key)
  202. {
  203.     assert(key);
  204.     return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;
  205. }
  206.  
  207. static int conn_compare(unsigned long key[], hash_count_t keys, link_t *item)
  208. {
  209.     connection_t *hs;
  210.  
  211.     hs = hash_table_get_instance(item, connection_t, link);
  212.    
  213.     return key[0] == hs->in_phone_hash;
  214. }
  215.  
  216. static void conn_remove(link_t *item)
  217. {
  218.     free(hash_table_get_instance(item, connection_t, link));
  219. }
  220.  
  221.  
  222. /** Operations for NS hash table. */
  223. static hash_table_operations_t conn_hash_table_ops = {
  224.     .hash = conn_hash,
  225.     .compare = conn_compare,
  226.     .remove_callback = conn_remove
  227. };
  228.  
  229. /** Insert sort timeout msg into timeouts list
  230.  *
  231.  */
  232. static void insert_timeout(awaiter_t *wd)
  233. {
  234.     link_t *tmp;
  235.     awaiter_t *cur;
  236.  
  237.     wd->timedout = 0;
  238.     wd->inlist = 1;
  239.  
  240.     tmp = timeout_list.next;
  241.     while (tmp != &timeout_list) {
  242.         cur = list_get_instance(tmp, awaiter_t, link);
  243.         if (tv_gteq(&cur->expires, &wd->expires))
  244.             break;
  245.         tmp = tmp->next;
  246.     }
  247.     list_append(&wd->link, tmp);
  248. }
  249.  
  250. /*************************************************/
  251.  
  252. /** Try to route a call to an appropriate connection thread
  253.  *
  254.  */
  255. static int route_call(ipc_callid_t callid, ipc_call_t *call)
  256. {
  257.     connection_t *conn;
  258.     msg_t *msg;
  259.     link_t *hlp;
  260.     unsigned long key;
  261.  
  262.     futex_down(&async_futex);
  263.  
  264.     key = call->in_phone_hash;
  265.     hlp = hash_table_find(&conn_hash_table, &key);
  266.     if (!hlp) {
  267.         futex_up(&async_futex);
  268.         return 0;
  269.     }
  270.     conn = hash_table_get_instance(hlp, connection_t, link);
  271.  
  272.     msg = malloc(sizeof(*msg));
  273.     msg->callid = callid;
  274.     msg->call = *call;
  275.     list_append(&msg->link, &conn->msg_queue);
  276.  
  277.     if (IPC_GET_METHOD(*call) == IPC_M_PHONE_HUNGUP)
  278.         conn->close_callid = callid;
  279.    
  280.     /* If the call is waiting for event, run it */
  281.     if (!conn->wdata.active) {
  282.         /* If in timeout list, remove it */
  283.         if (conn->wdata.inlist) {
  284.             conn->wdata.inlist = 0;
  285.             list_remove(&conn->wdata.link);
  286.         }
  287.         conn->wdata.active = 1;
  288.         psthread_add_ready(conn->wdata.ptid);
  289.     }
  290.  
  291.     futex_up(&async_futex);
  292.  
  293.     return 1;
  294. }
  295.  
  296. /** Return new incoming message for current(thread-local) connection */
  297. ipc_callid_t async_get_call_timeout(ipc_call_t *call, suseconds_t usecs)
  298. {
  299.     msg_t *msg;
  300.     ipc_callid_t callid;
  301.     connection_t *conn;
  302.    
  303.     assert(PS_connection);
  304.     /* GCC 4.1.0 coughs on PS_connection-> dereference,
  305.      * GCC 4.1.1 happilly puts the rdhwr instruction in delay slot.
  306.      *           I would never expect to find so many errors in
  307.      *           compiler *($&$(*&$
  308.      */
  309.     conn = PS_connection;
  310.  
  311.     futex_down(&async_futex);
  312.  
  313.     if (usecs) {
  314.         gettimeofday(&conn->wdata.expires, NULL);
  315.         tv_add(&conn->wdata.expires, usecs);
  316.     } else {
  317.         conn->wdata.inlist = 0;
  318.     }
  319.     /* If nothing in queue, wait until something appears */
  320.     while (list_empty(&conn->msg_queue)) {
  321.         if (usecs)
  322.             insert_timeout(&conn->wdata);
  323.  
  324.         conn->wdata.active = 0;
  325.         psthread_schedule_next_adv(PS_TO_MANAGER);
  326.         /* Futex is up after getting back from async_manager
  327.          * get it again */
  328.         futex_down(&async_futex);
  329.         if (usecs && conn->wdata.timedout && \
  330.             list_empty(&conn->msg_queue)) {
  331.             /* If we timed out-> exit */
  332.             futex_up(&async_futex);
  333.             return 0;
  334.         }
  335.     }
  336.    
  337.     msg = list_get_instance(conn->msg_queue.next, msg_t, link);
  338.     list_remove(&msg->link);
  339.     callid = msg->callid;
  340.     *call = msg->call;
  341.     free(msg);
  342.    
  343.     futex_up(&async_futex);
  344.     return callid;
  345. }
  346.  
  347. /** Thread function that gets created on new connection
  348.  *
  349.  * This function is defined as a weak symbol - to be redefined in
  350.  * user code.
  351.  */
  352. static void default_client_connection(ipc_callid_t callid, ipc_call_t *call)
  353. {
  354.     ipc_answer_fast(callid, ENOENT, 0, 0);
  355. }
  356. static void default_interrupt_received(ipc_callid_t callid, ipc_call_t *call)
  357. {
  358. }
  359.  
  360. /** Wrapper for client connection thread
  361.  *
  362.  * When new connection arrives, thread with this function is created.
  363.  * It calls client_connection and does final cleanup.
  364.  *
  365.  * @param arg Connection structure pointer
  366.  */
  367. static int connection_thread(void  *arg)
  368. {
  369.     unsigned long key;
  370.     msg_t *msg;
  371.     int close_answered = 0;
  372.  
  373.     /* Setup thread local connection pointer */
  374.     PS_connection = (connection_t *)arg;
  375.     PS_connection->cthread(PS_connection->callid, &PS_connection->call);
  376.     /* Remove myself from connection hash table */
  377.     futex_down(&async_futex);
  378.     key = PS_connection->in_phone_hash;
  379.     hash_table_remove(&conn_hash_table, &key, 1);
  380.     futex_up(&async_futex);
  381.     /* Answer all remaining messages with ehangup */
  382.     while (!list_empty(&PS_connection->msg_queue)) {
  383.         msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);
  384.         list_remove(&msg->link);
  385.         if (msg->callid == PS_connection->close_callid)
  386.             close_answered = 1;
  387.         ipc_answer_fast(msg->callid, EHANGUP, 0, 0);
  388.         free(msg);
  389.     }
  390.     if (PS_connection->close_callid)
  391.         ipc_answer_fast(PS_connection->close_callid, 0, 0, 0);
  392. }
  393.  
  394. /** Create new thread for a new connection
  395.  *
  396.  * Creates new thread for connection, fills in connection
  397.  * structures and inserts it into the hash table, so that
  398.  * later we can easily do routing of messages to particular
  399.  * threads.
  400.  *
  401.  * @param in_phone_hash Identification of the incoming connection
  402.  * @param callid Callid of the IPC_M_CONNECT_ME_TO packet
  403.  * @param call Call data of the opening packet
  404.  * @param cthread Thread function that should be called upon
  405.  *                opening the connection
  406.  * @return New thread id
  407.  */
  408. pstid_t async_new_connection(ipcarg_t in_phone_hash,ipc_callid_t callid,
  409.                  ipc_call_t *call,
  410.                  void (*cthread)(ipc_callid_t,ipc_call_t *))
  411. {
  412.     pstid_t ptid;
  413.     connection_t *conn;
  414.     unsigned long key;
  415.  
  416.     conn = malloc(sizeof(*conn));
  417.     if (!conn) {
  418.         ipc_answer_fast(callid, ENOMEM, 0, 0);
  419.         return NULL;
  420.     }
  421.     conn->in_phone_hash = in_phone_hash;
  422.     list_initialize(&conn->msg_queue);
  423.     conn->callid = callid;
  424.     conn->close_callid = 0;
  425.     if (call)
  426.         conn->call = *call;
  427.     conn->wdata.active = 1; /* We will activate it asap */
  428.     conn->cthread = cthread;
  429.  
  430.     conn->wdata.ptid = psthread_create(connection_thread, conn);
  431.     if (!conn->wdata.ptid) {
  432.         free(conn);
  433.         ipc_answer_fast(callid, ENOMEM, 0, 0);
  434.         return NULL;
  435.     }
  436.     /* Add connection to hash table */
  437.     key = conn->in_phone_hash;
  438.     futex_down(&async_futex);
  439.     hash_table_insert(&conn_hash_table, &key, &conn->link);
  440.     futex_up(&async_futex);
  441.  
  442.     psthread_add_ready(conn->wdata.ptid);
  443.  
  444.     return conn->wdata.ptid;
  445. }
  446.  
  447. /** Handle call that was received */
  448. static void handle_call(ipc_callid_t callid, ipc_call_t *call)
  449. {
  450.     /* Unrouted call - do some default behaviour */
  451.     switch (IPC_GET_METHOD(*call)) {
  452.     case IPC_M_INTERRUPT:
  453.         in_interrupt_handler = 1;
  454.         (*interrupt_received)(callid,call);
  455.         in_interrupt_handler = 0;
  456.         return;
  457.     case IPC_M_CONNECT_ME_TO:
  458.         /* Open new connection with thread etc. */
  459.         async_new_connection(IPC_GET_ARG3(*call), callid, call, client_connection);
  460.         return;
  461.     }
  462.  
  463.     /* Try to route call through connection tables */
  464.     if (route_call(callid, call))
  465.         return;
  466.  
  467.     /* Unknown call from unknown phone - hang it up */
  468.     ipc_answer_fast(callid, EHANGUP, 0, 0);
  469. }
  470.  
  471. /** Fire all timeouts that expired
  472.  *
  473.  */
  474. static void handle_expired_timeouts(void)
  475. {
  476.     struct timeval tv;
  477.     awaiter_t *waiter;
  478.     link_t *cur;
  479.  
  480.     gettimeofday(&tv,NULL);
  481.     futex_down(&async_futex);
  482.  
  483.     cur = timeout_list.next;
  484.     while (cur != &timeout_list) {
  485.         waiter = list_get_instance(cur,awaiter_t,link);
  486.         if (tv_gt(&waiter->expires, &tv))
  487.             break;
  488.         cur = cur->next;
  489.         list_remove(&waiter->link);
  490.         waiter->inlist = 0;
  491.         waiter->timedout = 1;
  492.         /* Redundant condition? The thread should not
  493.          * be active when it gets here.
  494.          */
  495.         if (!waiter->active) {
  496.             waiter->active = 1;
  497.             psthread_add_ready(waiter->ptid);
  498.         }
  499.     }
  500.  
  501.     futex_up(&async_futex);
  502. }
  503.  
  504. /** Endless loop dispatching incoming calls and answers */
  505. static int async_manager_worker(void)
  506. {
  507.     ipc_call_t call;
  508.     ipc_callid_t callid;
  509.     int timeout;
  510.     awaiter_t *waiter;
  511.     struct timeval tv;
  512.  
  513.     while (1) {
  514.         if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {
  515.             futex_up(&async_futex); /* async_futex is always held
  516.                         * when entering manager thread
  517.                         */
  518.             continue;
  519.         }
  520.         futex_down(&async_futex);
  521.         if (!list_empty(&timeout_list)) {
  522.             waiter = list_get_instance(timeout_list.next,awaiter_t,link);
  523.             gettimeofday(&tv,NULL);
  524.             if (tv_gteq(&tv, &waiter->expires)) {
  525.                 futex_up(&async_futex);
  526.                 handle_expired_timeouts();
  527.                 continue;
  528.             } else
  529.                 timeout = tv_sub(&waiter->expires, &tv);
  530.         } else
  531.             timeout = SYNCH_NO_TIMEOUT;
  532.         futex_up(&async_futex);
  533.  
  534.         callid = ipc_wait_cycle(&call, timeout, SYNCH_FLAGS_NONE);
  535.  
  536.         if (!callid) {
  537.             handle_expired_timeouts();
  538.             continue;
  539.         }
  540.  
  541.         if (callid & IPC_CALLID_ANSWERED) {
  542.             continue;
  543.         }
  544.  
  545.         handle_call(callid, &call);
  546.     }
  547. }
  548.  
  549. /** Function to start async_manager as a standalone thread
  550.  *
  551.  * When more kernel threads are used, one async manager should
  552.  * exist per thread. The particular implementation may change,
  553.  * currently one async_manager is started automatically per kernel
  554.  * thread except main thread.
  555.  */
  556. static int async_manager_thread(void *arg)
  557. {
  558.     futex_up(&async_futex); /* async_futex is always locked when entering
  559.                 * manager */
  560.     async_manager_worker();
  561. }
  562.  
  563. /** Add one manager to manager list */
  564. void async_create_manager(void)
  565. {
  566.     pstid_t ptid;
  567.  
  568.     ptid = psthread_create(async_manager_thread, NULL);
  569.     psthread_add_manager(ptid);
  570. }
  571.  
  572. /** Remove one manager from manager list */
  573. void async_destroy_manager(void)
  574. {
  575.     psthread_remove_manager();
  576. }
  577.  
  578. /** Initialize internal structures needed for async manager */
  579. int _async_init(void)
  580. {
  581.     if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {
  582.         printf("%s: cannot create hash table\n", "async");
  583.         return ENOMEM;
  584.     }
  585.    
  586. }
  587.  
  588. /** IPC handler for messages in async framework
  589.  *
  590.  * Notify thread that is waiting for this message, that it arrived
  591.  */
  592. static void reply_received(void *private, int retval,
  593.                ipc_call_t *data)
  594. {
  595.     amsg_t *msg = (amsg_t *) private;
  596.  
  597.     msg->retval = retval;
  598.  
  599.     futex_down(&async_futex);
  600.     /* Copy data after futex_down, just in case the
  601.      * call was detached
  602.      */
  603.     if (msg->dataptr)
  604.         *msg->dataptr = *data;
  605.  
  606.     write_barrier();
  607.     /* Remove message from timeout list */
  608.     if (msg->wdata.inlist)
  609.         list_remove(&msg->wdata.link);
  610.     msg->done = 1;
  611.     if (! msg->wdata.active) {
  612.         msg->wdata.active = 1;
  613.         psthread_add_ready(msg->wdata.ptid);
  614.     }
  615.     futex_up(&async_futex);
  616. }
  617.  
  618. /** Send message and return id of the sent message
  619.  *
  620.  * The return value can be used as input for async_wait() to wait
  621.  * for completion.
  622.  */
  623. aid_t async_send_2(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2,
  624.            ipc_call_t *dataptr)
  625. {
  626.     amsg_t *msg;
  627.  
  628.     if (in_interrupt_handler) {
  629.         printf("Cannot send asynchronou request in interrupt handler.\n");
  630.         _exit(1);
  631.     }
  632.  
  633.     msg = malloc(sizeof(*msg));
  634.     msg->done = 0;
  635.     msg->dataptr = dataptr;
  636.  
  637.     msg->wdata.active = 1; /* We may sleep in next method, but it
  638.                 * will use it's own mechanism */
  639.     ipc_call_async_2(phoneid,method,arg1,arg2,msg,reply_received,1);
  640.  
  641.     return (aid_t) msg;
  642. }
  643.  
  644. /** Send message and return id of the sent message
  645.  *
  646.  * The return value can be used as input for async_wait() to wait
  647.  * for completion.
  648.  */
  649. aid_t async_send_3(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2,
  650.            ipcarg_t arg3, ipc_call_t *dataptr)
  651. {
  652.     amsg_t *msg;
  653.  
  654.     if (in_interrupt_handler) {
  655.         printf("Cannot send asynchronou request in interrupt handler.\n");
  656.         _exit(1);
  657.     }
  658.  
  659.     msg = malloc(sizeof(*msg));
  660.     msg->done = 0;
  661.     msg->dataptr = dataptr;
  662.  
  663.     msg->wdata.active = 1; /* We may sleep in next method, but it
  664.                 * will use it's own mechanism */
  665.     ipc_call_async_3(phoneid,method,arg1,arg2,arg3, msg,reply_received,1);
  666.  
  667.     return (aid_t) msg;
  668. }
  669.  
  670. /** Wait for a message sent by async framework
  671.  *
  672.  * @param amsgid Message ID to wait for
  673.  * @param retval Pointer to variable where will be stored retval
  674.  *               of the answered message. If NULL, it is ignored.
  675.  *
  676.  */
  677. void async_wait_for(aid_t amsgid, ipcarg_t *retval)
  678. {
  679.     amsg_t *msg = (amsg_t *) amsgid;
  680.     connection_t *conn;
  681.  
  682.     futex_down(&async_futex);
  683.     if (msg->done) {
  684.         futex_up(&async_futex);
  685.         goto done;
  686.     }
  687.  
  688.     msg->wdata.ptid = psthread_get_id();
  689.     msg->wdata.active = 0;
  690.     msg->wdata.inlist = 0;
  691.     /* Leave locked async_futex when entering this function */
  692.     psthread_schedule_next_adv(PS_TO_MANAGER);
  693.     /* futex is up automatically after psthread_schedule_next...*/
  694. done:
  695.     if (retval)
  696.         *retval = msg->retval;
  697.     free(msg);
  698. }
  699.  
  700. /** Wait for a message sent by async framework with timeout
  701.  *
  702.  * @param amsgid Message ID to wait for
  703.  * @param retval Pointer to variable where will be stored retval
  704.  *               of the answered message. If NULL, it is ignored.
  705.  * @param timeout Timeout in usecs
  706.  * @return 0 on success, ETIMEOUT if timeout expired
  707.  *
  708.  */
  709. int async_wait_timeout(aid_t amsgid, ipcarg_t *retval, suseconds_t timeout)
  710. {
  711.     amsg_t *msg = (amsg_t *) amsgid;
  712.     connection_t *conn;
  713.  
  714.     /* TODO: Let it go through the event read at least once */
  715.     if (timeout < 0)
  716.         return ETIMEOUT;
  717.  
  718.     futex_down(&async_futex);
  719.     if (msg->done) {
  720.         futex_up(&async_futex);
  721.         goto done;
  722.     }
  723.  
  724.     gettimeofday(&msg->wdata.expires, NULL);
  725.     tv_add(&msg->wdata.expires, timeout);
  726.  
  727.     msg->wdata.ptid = psthread_get_id();
  728.     msg->wdata.active = 0;
  729.     insert_timeout(&msg->wdata);
  730.  
  731.     /* Leave locked async_futex when entering this function */
  732.     psthread_schedule_next_adv(PS_TO_MANAGER);
  733.     /* futex is up automatically after psthread_schedule_next...*/
  734.  
  735.     if (!msg->done)
  736.         return ETIMEOUT;
  737.  
  738. done:
  739.     if (retval)
  740.         *retval = msg->retval;
  741.     free(msg);
  742.  
  743.     return 0;
  744. }
  745.  
  746. /** Wait specified time, but in the meantime handle incoming events
  747.  *
  748.  * @param timeout Time in microseconds to wait
  749.  */
  750. void async_usleep(suseconds_t timeout)
  751. {
  752.     amsg_t *msg;
  753.    
  754.     if (in_interrupt_handler) {
  755.         printf("Cannot call async_usleep in interrupt handler.\n");
  756.         _exit(1);
  757.     }
  758.  
  759.     msg = malloc(sizeof(*msg));
  760.     if (!msg)
  761.         return;
  762.  
  763.     msg->wdata.ptid = psthread_get_id();
  764.     msg->wdata.active = 0;
  765.  
  766.     gettimeofday(&msg->wdata.expires, NULL);
  767.     tv_add(&msg->wdata.expires, timeout);
  768.  
  769.     futex_down(&async_futex);
  770.     insert_timeout(&msg->wdata);
  771.     /* Leave locked async_futex when entering this function */
  772.     psthread_schedule_next_adv(PS_TO_MANAGER);
  773.     /* futex is up automatically after psthread_schedule_next...*/
  774.     free(msg);
  775. }
  776.  
  777. /** Set function that is called, IPC_M_CONNECT_ME_TO is received
  778.  *
  779.  * @param conn Function that will form new psthread.
  780.  */
  781. void async_set_client_connection(async_client_conn_t conn)
  782. {
  783.     client_connection = conn;
  784. }
  785. void async_set_interrupt_received(async_client_conn_t conn)
  786. {
  787.     interrupt_received = conn;
  788. }
  789.  
  790. /* Primitive functions for simple communication */
  791. void async_msg_3(int phoneid, ipcarg_t method, ipcarg_t arg1,
  792.          ipcarg_t arg2, ipcarg_t arg3)
  793. {
  794.     ipc_call_async_3(phoneid, method, arg1, arg2, arg3, NULL, NULL, !in_interrupt_handler);
  795. }
  796.  
  797. void async_msg_2(int phoneid, ipcarg_t method, ipcarg_t arg1, ipcarg_t arg2)
  798. {
  799.     ipc_call_async_2(phoneid, method, arg1, arg2, NULL, NULL, !in_interrupt_handler);
  800. }
  801.  
  802.  
  803.  /** @}
  804.  */
  805.  
  806.  
  807.