WebSVN – HelenOS-historic – Diff – /uspace/trunk/libc/generic/async.c


/*
 * 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.
 */
 
/**
 * Asynchronous library
 *
 * The aim of this library is facilitating writing programs utilizing
 * the asynchronous nature of Helenos IPC, yet using a normal way
 * of programming.
 *
 * You should be able to write very simple multithreaded programs,
 * the async framework will automatically take care of most synchronization
 * problems.
 *
 * Default semantics:
 * - send() - send asynchronously. If the kernel refuses to send more
 *            messages, [ try to get responses from kernel, if nothing
 *            found, might try synchronous ]
 *
 * Example of use:
 *
 * 1) Multithreaded client application
 *  create_thread(thread1);
 *  create_thread(thread2);
 *  ...
 *  
 *  thread1() {
 *        conn = ipc_connect_me_to();
 *        c1 = send(conn);
 *        c2 = send(conn);
 *        wait_for(c1);
 *        wait_for(c2);
 *  }
 *
 *
 * 2) Multithreaded server application
 * main() {
 *      async_manager();
 * }
 *
 *
 * client_connection(icallid, *icall) {
 *       if (want_refuse) {
 *           ipc_answer_fast(icallid, ELIMIT, 0, 0);
 *           return;
 *       }
 *       ipc_answer_fast(icallid, 0, 0, 0);
 *
 *       callid = async_get_call(&call);
 *       handle(callid, call);
 *       ipc_answer_fast(callid, 1,2,3);
 *
 *       callid = async_get_call(&call);
 *       ....
 * }
 *
 * TODO: Detaching/joining dead psthreads?
 */
#include <futex.h>
#include <async.h>
#include <psthread.h>
#include <stdio.h>
#include <libadt/hash_table.h>
#include <libadt/list.h>
#include <ipc/ipc.h>
#include <assert.h>
#include <errno.h>
 
static atomic_t conn_futex = FUTEX_INITIALIZER;
static hash_table_t conn_hash_table;
 
typedef struct {
    link_t link;
    ipc_callid_t callid;
    ipc_call_t call;
} msg_t;
 
typedef struct {
    link_t link;
    ipcarg_t in_phone_hash;     /**< Incoming phone hash. */
    link_t msg_queue;              /**< Messages that should be delivered to this thread */
    pstid_t ptid;                /**< Thread associated with this connection */
    int active;                     /**< If this thread is currently active */
    /* Structures for connection opening packet */
    ipc_callid_t callid;
    ipc_call_t call;
    void (*cthread)(ipc_callid_t,ipc_call_t *);
} connection_t;
 
__thread connection_t *PS_connection;
 
/* Hash table functions */
 
#define CONN_HASH_TABLE_CHAINS  32
 
static hash_index_t conn_hash(unsigned long *key)
{
    assert(key);
    return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;
}
 
static int conn_compare(unsigned long key[], hash_count_t keys, link_t *item)
{
    connection_t *hs;
 
    hs = hash_table_get_instance(item, connection_t, link);
   
    return key[0] == hs->in_phone_hash;
}
 
static void conn_remove(link_t *item)
{
    free(hash_table_get_instance(item, connection_t, link));
}
 
 
/** Operations for NS hash table. */
static hash_table_operations_t conn_hash_table_ops = {
    .hash = conn_hash,
    .compare = conn_compare,
    .remove_callback = conn_remove
};
 
/** Try to route a call to an appropriate connection thread
 *
 */
static int route_call(ipc_callid_t callid, ipc_call_t *call)
{
    connection_t *conn;
    msg_t *msg;
    link_t *hlp;
    unsigned long key;
 
    futex_down(&conn_futex);
 
    key = call->in_phone_hash;
    hlp = hash_table_find(&conn_hash_table, &key);
    if (!hlp) {
        futex_up(&conn_futex);
        return 0;
    }
    conn = hash_table_get_instance(hlp, connection_t, link);
 
    msg = malloc(sizeof(*msg));
    msg->callid = callid;
    msg->call = *call;
    list_append(&msg->link, &conn->msg_queue);
   
    if (!conn->active) {
        conn->active = 1;
        psthread_add_ready(conn->ptid);
    }
 
    futex_up(&conn_futex);
 
    return 1;
}
 
/** Return new incoming message for current(thread-local) connection */
ipc_callid_t async_get_call(ipc_call_t *call)
{
    msg_t *msg;
    ipc_callid_t callid;
    connection_t *conn;
   
    futex_down(&conn_futex);
 
    conn = PS_connection;
    /* If nothing in queue, wait until something appears */
    if (list_empty(&conn->msg_queue)) {
        conn->active = 0;
        psthread_schedule_next_adv(PS_TO_MANAGER);
    }
   
    msg = list_get_instance(conn->msg_queue.next, msg_t, link);
    list_remove(&msg->link);
    callid = msg->callid;
    *call = msg->call;
    free(msg);
   
    futex_up(&conn_futex);
    return callid;
}
 
/** Thread function that gets created on new connection
 *
 * This function is defined as a weak symbol - to be redefined in
 * user code.
 */
void client_connection(ipc_callid_t callid, ipc_call_t *call)
{
    ipc_answer_fast(callid, ENOENT, 0, 0);
}
 
/** Wrapper for client connection thread
 *
 * When new connection arrives, thread with this function is created.
 * It calls client_connection and does final cleanup.
 *
 * @parameter arg Connection structure pointer
 */
static int connection_thread(void  *arg)
{
    unsigned long key;
    msg_t *msg;
 
    /* Setup thread local connection pointer */
    PS_connection = (connection_t *)arg;
    PS_connection->cthread(PS_connection->callid, &PS_connection->call);
 
    /* Remove myself from connection hash table */
    futex_down(&conn_futex);
    key = PS_connection->in_phone_hash;
    hash_table_remove(&conn_hash_table, &key, 1);
    futex_up(&conn_futex);
    /* Answer all remaining messages with ehangup */
    while (!list_empty(&PS_connection->msg_queue)) {
        msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);
        list_remove(&msg->link);
        ipc_answer_fast(msg->callid, EHANGUP, 0, 0);
        free(msg);
    }
}
 
/** Create new thread for a new connection
 *
 * Creates new thread for connection, fills in connection
 * structures and inserts it into the hash table, so that
 * later we can easily do routing of messages to particular
 * threads.
 *
 * @param callid Callid of the IPC_M_CONNECT_ME_TO packet
 * @param call Call data of the opening packet
 * @param cthread Thread function that should be called upon
 *                opening the connection
 * @return New thread id
 */
pstid_t async_new_connection(ipc_callid_t callid, ipc_call_t *call,
                 void (*cthread)(ipc_callid_t,ipc_call_t *))
{
    pstid_t ptid;
    connection_t *conn;
    unsigned long key;
 
    conn = malloc(sizeof(*conn));
    if (!conn) {
        ipc_answer_fast(callid, ENOMEM, 0, 0);
        return NULL;
    }
    conn->in_phone_hash = IPC_GET_ARG3(*call);
    list_initialize(&conn->msg_queue);
    conn->ptid = psthread_create(connection_thread, conn);
    conn->callid = callid;
    conn->call = *call;
    conn->active = 1; /* We will activate it asap */
    conn->cthread = cthread;
    list_initialize(&conn->link);
    if (!conn->ptid) {
        free(conn);
        ipc_answer_fast(callid, ENOMEM, 0, 0);
        return NULL;
    }
    key = conn->in_phone_hash;
    futex_down(&conn_futex);
    /* Add connection to hash table */
    hash_table_insert(&conn_hash_table, &key, &conn->link);
    futex_up(&conn_futex);
 
    psthread_add_ready(conn->ptid);
 
    return conn->ptid;
}
 
/** Handle call to a task */
static void handle_call(ipc_callid_t callid, ipc_call_t *call)
{
    if (route_call(callid, call))
        return;
 
    switch (IPC_GET_METHOD(*call)) {
    case IPC_M_INTERRUPT:
        break;
    case IPC_M_CONNECT_ME_TO:
        /* Open new connection with thread etc. */
        async_new_connection(callid, call, client_connection);
        break;
    default:
        ipc_answer_fast(callid, EHANGUP, 0, 0);
    }
}
 
/** Endless loop dispatching incoming calls and answers */
int async_manager()
{
    ipc_call_t call;
    ipc_callid_t callid;
 
    while (1) {
        if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {
            futex_up(&conn_futex); /* conn_futex is always held
                        * when entering manager thread
                        */
            continue;
        }
        callid = ipc_wait_cycle(&call,SYNCH_NO_TIMEOUT,SYNCH_BLOCKING);
 
        if (callid & IPC_CALLID_ANSWERED)
            continue;
        handle_call(callid, &call);
    }
}
 
/** Function to start async_manager as a standalone thread
 *
 * When more kernel threads are used, one async manager should
 * exist per thread. The particular implementation may change,
 * currently one async_manager is started automatically per kernel
 * thread except main thread.
 */
static int async_manager_thread(void *arg)
{
    futex_up(&conn_futex); /* conn_futex is always locked when entering
                * manager */
    async_manager();
}
 
/** Add one manager to manager list */
void async_create_manager(void)
{
    pstid_t ptid;
 
    ptid = psthread_create(async_manager_thread, NULL);
    psthread_add_manager(ptid);
}
 
/** Remove one manager from manager list */
void async_destroy_manager(void)
{
    psthread_remove_manager();
}
 
/** Initialize internal structures needed for async manager */
int _async_init(void)
{
    if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {
        printf("%s: cannot create hash table\n", "async");
        return ENOMEM;
    }
   
}
 

Rev 1405	Rev 1407
1	/*	1	/*
2	* Copyright (C) 2006 Ondrej Palkovsky	2	* Copyright (C) 2006 Ondrej Palkovsky
3	* All rights reserved.	3	* All rights reserved.
4	*	4	*
5	* Redistribution and use in source and binary forms, with or without	5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions	6	* modification, are permitted provided that the following conditions
7	* are met:	7	* are met:
8	*	8	*
9	* - Redistributions of source code must retain the above copyright	9	* - Redistributions of source code must retain the above copyright
10	* notice, this list of conditions and the following disclaimer.	10	* notice, this list of conditions and the following disclaimer.
11	* - Redistributions in binary form must reproduce the above copyright	11	* - Redistributions in binary form must reproduce the above copyright
12	* notice, this list of conditions and the following disclaimer in the	12	* notice, this list of conditions and the following disclaimer in the
13	* documentation and/or other materials provided with the distribution.	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	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.	15	* derived from this software without specific prior written permission.
16	*	16	*
17	* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR	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	18	* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.	19	* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,	20	* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT	21	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,	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	23	* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24	* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT	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	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.	26	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27	*/	27	*/
28		28
29	/**	29	/**
30	* Asynchronous library	30	* Asynchronous library
31	*	31	*
32	* The aim of this library is facilitating writing programs utilizing	32	* The aim of this library is facilitating writing programs utilizing
33	* the asynchronous nature of Helenos IPC, yet using a normal way	33	* the asynchronous nature of Helenos IPC, yet using a normal way
34	* of programming.	34	* of programming.
35	*	35	*
36	* You should be able to write very simple multithreaded programs,	36	* You should be able to write very simple multithreaded programs,
37	* the async framework will automatically take care of most synchronization	37	* the async framework will automatically take care of most synchronization
38	* problems.	38	* problems.
39	*	39	*
40	* Default semantics:	40	* Default semantics:
41	* - send() - send asynchronously. If the kernel refuses to send more	41	* - send() - send asynchronously. If the kernel refuses to send more
42	* messages, [ try to get responses from kernel, if nothing	42	* messages, [ try to get responses from kernel, if nothing
43	* found, might try synchronous ]	43	* found, might try synchronous ]
44	*	44	*
45	* Example of use:	45	* Example of use:
46	*	46	*
47	* 1) Multithreaded client application	47	* 1) Multithreaded client application
48	* create_thread(thread1);	48	* create_thread(thread1);
49	* create_thread(thread2);	49	* create_thread(thread2);
50	* ...	50	* ...
51	*	51	*
52	* thread1() {	52	* thread1() {
53	* conn = ipc_connect_me_to();	53	* conn = ipc_connect_me_to();
54	* c1 = send(conn);	54	* c1 = send(conn);
55	* c2 = send(conn);	55	* c2 = send(conn);
56	* wait_for(c1);	56	* wait_for(c1);
57	* wait_for(c2);	57	* wait_for(c2);
58	* }	58	* }
59	*	59	*
60	*	60	*
61	* 2) Multithreaded server application	61	* 2) Multithreaded server application
62	* main() {	62	* main() {
63	* wait_for_connection(new_connection);	63	* async_manager();
64	* }	64	* }
65	*	65	*
66	*	66	*
67	* new_connection(int connection) {	67	* client_connection(icallid, *icall) {
68	* accept(connection);	68	* if (want_refuse) {
-		69	* ipc_answer_fast(icallid, ELIMIT, 0, 0);
69	* msg = get_msg();	70	* return;
-		71	* }
-		72	* ipc_answer_fast(icallid, 0, 0, 0);
-		73	*
-		74	* callid = async_get_call(&call);
70	* handle(msg);	75	* handle(callid, call);
71	* answer(msg);	76	* ipc_answer_fast(callid, 1,2,3);
72	*	77	*
73	* msg = get_msg();	78	* callid = async_get_call(&call);
74	* ....	79	* ....
75	* }	80	* }
76	*	81	*
77	* TODO: Detaching/joining dead psthreads?	82	* TODO: Detaching/joining dead psthreads?
78	*/	83	*/
79	#include <futex.h>	84	#include <futex.h>
80	#include <async.h>	85	#include <async.h>
81	#include <psthread.h>	86	#include <psthread.h>
82	#include <stdio.h>	87	#include <stdio.h>
83	#include <libadt/hash_table.h>	88	#include <libadt/hash_table.h>
84	#include <libadt/list.h>	89	#include <libadt/list.h>
85	#include <ipc/ipc.h>	90	#include <ipc/ipc.h>
86	#include <assert.h>	91	#include <assert.h>
87	#include <errno.h>	92	#include <errno.h>
88		93
89	static atomic_t conn_futex = FUTEX_INITIALIZER;	94	static atomic_t conn_futex = FUTEX_INITIALIZER;
90	static hash_table_t conn_hash_table;	95	static hash_table_t conn_hash_table;
91		96
92	typedef struct {	97	typedef struct {
93	link_t link;	98	link_t link;
94	ipc_callid_t callid;	99	ipc_callid_t callid;
95	ipc_call_t call;	100	ipc_call_t call;
96	} msg_t;	101	} msg_t;
97		102
98	typedef struct {	103	typedef struct {
99	link_t link;	104	link_t link;
100	ipcarg_t in_phone_hash; /*< Incoming phone hash. /	105	ipcarg_t in_phone_hash; /*< Incoming phone hash. /
101	link_t msg_queue; /*< Messages that should be delivered to this thread /	106	link_t msg_queue; /*< Messages that should be delivered to this thread /
102	pstid_t ptid; /*< Thread associated with this connection /	107	pstid_t ptid; /*< Thread associated with this connection /
103	int active; /*< If this thread is currently active /	108	int active; /*< If this thread is currently active /
104	/* Structures for connection opening packet */	109	/* Structures for connection opening packet */
105	ipc_callid_t callid;	110	ipc_callid_t callid;
106	ipc_call_t call;	111	ipc_call_t call;
-		112	void (cthread)(ipc_callid_t,ipc_call_t );
107	} connection_t;	113	} connection_t;
108		114
109	__thread connection_t *PS_connection;	115	__thread connection_t *PS_connection;
110		116
111	/* Hash table functions */	117	/* Hash table functions */
112		118
113	#define CONN_HASH_TABLE_CHAINS 32	119	#define CONN_HASH_TABLE_CHAINS 32
114		120
115	static hash_index_t conn_hash(unsigned long *key)	121	static hash_index_t conn_hash(unsigned long *key)
116	{	122	{
117	assert(key);	123	assert(key);
118	return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;	124	return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;
119	}	125	}
120		126
121	static int conn_compare(unsigned long key[], hash_count_t keys, link_t *item)	127	static int conn_compare(unsigned long key[], hash_count_t keys, link_t *item)
122	{	128	{
123	connection_t *hs;	129	connection_t *hs;
124		130
125	hs = hash_table_get_instance(item, connection_t, link);	131	hs = hash_table_get_instance(item, connection_t, link);
126		132
127	return key[0] == hs->in_phone_hash;	133	return key[0] == hs->in_phone_hash;
128	}	134	}
129		135
130	static void conn_remove(link_t *item)	136	static void conn_remove(link_t *item)
131	{	137	{
132	free(hash_table_get_instance(item, connection_t, link));	138	free(hash_table_get_instance(item, connection_t, link));
133	}	139	}
134		140
135		141
136	/** Operations for NS hash table. */	142	/** Operations for NS hash table. */
137	static hash_table_operations_t conn_hash_table_ops = {	143	static hash_table_operations_t conn_hash_table_ops = {
138	.hash = conn_hash,	144	.hash = conn_hash,
139	.compare = conn_compare,	145	.compare = conn_compare,
140	.remove_callback = conn_remove	146	.remove_callback = conn_remove
141	};	147	};
142		148
143	/** Try to route a call to an appropriate connection thread	149	/** Try to route a call to an appropriate connection thread
144	*	150	*
145	*/	151	*/
146	static int route_call(ipc_callid_t callid, ipc_call_t *call)	152	static int route_call(ipc_callid_t callid, ipc_call_t *call)
147	{	153	{
148	connection_t *conn;	154	connection_t *conn;
149	msg_t *msg;	155	msg_t *msg;
150	link_t *hlp;	156	link_t *hlp;
151	unsigned long key;	157	unsigned long key;
152		158
153	futex_down(&conn_futex);	159	futex_down(&conn_futex);
154		160
155	key = call->in_phone_hash;	161	key = call->in_phone_hash;
156	hlp = hash_table_find(&conn_hash_table, &key);	162	hlp = hash_table_find(&conn_hash_table, &key);
157	if (!hlp) {	163	if (!hlp) {
158	futex_up(&conn_futex);	164	futex_up(&conn_futex);
159	return 0;	165	return 0;
160	}	166	}
161	conn = hash_table_get_instance(hlp, connection_t, link);	167	conn = hash_table_get_instance(hlp, connection_t, link);
162		168
163	msg = malloc(sizeof(*msg));	169	msg = malloc(sizeof(*msg));
164	msg->callid = callid;	170	msg->callid = callid;
165	msg->call = *call;	171	msg->call = *call;
166	list_append(&msg->link, &conn->msg_queue);	172	list_append(&msg->link, &conn->msg_queue);
167		173
168	if (!conn->active) {	174	if (!conn->active) {
169	conn->active = 1;	175	conn->active = 1;
170	psthread_add_ready(conn->ptid);	176	psthread_add_ready(conn->ptid);
171	}	177	}
172		178
173	futex_up(&conn_futex);	179	futex_up(&conn_futex);
174		180
175	return 1;	181	return 1;
176	}	182	}
177		183
178	/** Return new incoming message for current(thread-local) connection */	184	/** Return new incoming message for current(thread-local) connection */
179	ipc_callid_t async_get_call(ipc_call_t *call)	185	ipc_callid_t async_get_call(ipc_call_t *call)
180	{	186	{
181	msg_t *msg;	187	msg_t *msg;
182	ipc_callid_t callid;	188	ipc_callid_t callid;
183	connection_t *conn;	189	connection_t *conn;
184		190
185	futex_down(&conn_futex);	191	futex_down(&conn_futex);
186		192
187	conn = PS_connection;	193	conn = PS_connection;
188	/* If nothing in queue, wait until something appears */	194	/* If nothing in queue, wait until something appears */
189	if (list_empty(&conn->msg_queue)) {	195	if (list_empty(&conn->msg_queue)) {
190	conn->active = 0;	196	conn->active = 0;
191	psthread_schedule_next_adv(PS_TO_MANAGER);	197	psthread_schedule_next_adv(PS_TO_MANAGER);
192	}	198	}
193		199
194	msg = list_get_instance(conn->msg_queue.next, msg_t, link);	200	msg = list_get_instance(conn->msg_queue.next, msg_t, link);
195	list_remove(&msg->link);	201	list_remove(&msg->link);
196	callid = msg->callid;	202	callid = msg->callid;
197	*call = msg->call;	203	*call = msg->call;
198	free(msg);	204	free(msg);
199		205
200	futex_up(&conn_futex);	206	futex_up(&conn_futex);
201	return callid;	207	return callid;
202	}	208	}
203		209
204	/** Thread function that gets created on new connection	210	/** Thread function that gets created on new connection
205	*	211	*
206	* This function is defined as a weak symbol - to be redefined in	212	* This function is defined as a weak symbol - to be redefined in
207	* user code.	213	* user code.
208	*/	214	*/
209	void client_connection(ipc_callid_t callid, ipc_call_t *call)	215	void client_connection(ipc_callid_t callid, ipc_call_t *call)
210	{	216	{
211	ipc_answer_fast(callid, ENOENT, 0, 0);	217	ipc_answer_fast(callid, ENOENT, 0, 0);
212	}	218	}
213		219
214	/** Wrapper for client connection thread	220	/** Wrapper for client connection thread
215	*	221	*
216	* When new connection arrives, thread with this function is created.	222	* When new connection arrives, thread with this function is created.
217	* It calls client_connection and does final cleanup.	223	* It calls client_connection and does final cleanup.
218	*	224	*
219	* @parameter arg Connection structure pointer	225	* @parameter arg Connection structure pointer
220	*/	226	*/
221	static int connection_thread(void *arg)	227	static int connection_thread(void *arg)
222	{	228	{
223	unsigned long key;	229	unsigned long key;
224	msg_t *msg;	230	msg_t *msg;
225		231
226	/* Setup thread local connection pointer */	232	/* Setup thread local connection pointer */
227	PS_connection = (connection_t *)arg;	233	PS_connection = (connection_t *)arg;
228	client_connection(PS_connection->callid, &PS_connection->call);	234	PS_connection->cthread(PS_connection->callid, &PS_connection->call);
229		235
230	/* Remove myself from connection hash table */	236	/* Remove myself from connection hash table */
231	futex_down(&conn_futex);	237	futex_down(&conn_futex);
232	key = PS_connection->in_phone_hash;	238	key = PS_connection->in_phone_hash;
233	hash_table_remove(&conn_hash_table, &key, 1);	239	hash_table_remove(&conn_hash_table, &key, 1);
234	futex_up(&conn_futex);	240	futex_up(&conn_futex);
235	/* Answer all remaining messages with ehangup */	241	/* Answer all remaining messages with ehangup */
236	while (!list_empty(&PS_connection->msg_queue)) {	242	while (!list_empty(&PS_connection->msg_queue)) {
237	msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);	243	msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);
238	list_remove(&msg->link);	244	list_remove(&msg->link);
239	ipc_answer_fast(msg->callid, EHANGUP, 0, 0);	245	ipc_answer_fast(msg->callid, EHANGUP, 0, 0);
240	free(msg);	246	free(msg);
241	}	247	}
242	}	248	}
243		249
244	/** Create new thread for a new connection	250	/** Create new thread for a new connection
245	*	251	*
246	* Creates new thread for connection, fills in connection	252	* Creates new thread for connection, fills in connection
247	* structures and inserts it into the hash table, so that	253	* structures and inserts it into the hash table, so that
248	* later we can easily do routing of messages to particular	254	* later we can easily do routing of messages to particular
249	* threads.	255	* threads.
-		256	*
-		257	* @param callid Callid of the IPC_M_CONNECT_ME_TO packet
-		258	* @param call Call data of the opening packet
-		259	* @param cthread Thread function that should be called upon
-		260	* opening the connection
-		261	* @return New thread id
250	*/	262	*/
251	static void new_connection(ipc_callid_t callid, ipc_call_t *call)	263	pstid_t async_new_connection(ipc_callid_t callid, ipc_call_t *call,
-		264	void (cthread)(ipc_callid_t,ipc_call_t ))
252	{	265	{
253	pstid_t ptid;	266	pstid_t ptid;
254	connection_t *conn;	267	connection_t *conn;
255	unsigned long key;	268	unsigned long key;
256		269
257	conn = malloc(sizeof(*conn));	270	conn = malloc(sizeof(*conn));
258	if (!conn) {	271	if (!conn) {
259	ipc_answer_fast(callid, ENOMEM, 0, 0);	272	ipc_answer_fast(callid, ENOMEM, 0, 0);
260	return;	273	return NULL;
261	}	274	}
262	conn->in_phone_hash = IPC_GET_ARG3(*call);	275	conn->in_phone_hash = IPC_GET_ARG3(*call);
263	list_initialize(&conn->msg_queue);	276	list_initialize(&conn->msg_queue);
264	conn->ptid = psthread_create(connection_thread, conn);	277	conn->ptid = psthread_create(connection_thread, conn);
265	conn->callid = callid;	278	conn->callid = callid;
266	conn->call = *call;	279	conn->call = *call;
267	conn->active = 1; /* We will activate it asap */	280	conn->active = 1; /* We will activate it asap */
-		281	conn->cthread = cthread;
268	list_initialize(&conn->link);	282	list_initialize(&conn->link);
269	if (!conn->ptid) {	283	if (!conn->ptid) {
270	free(conn);	284	free(conn);
271	ipc_answer_fast(callid, ENOMEM, 0, 0);	285	ipc_answer_fast(callid, ENOMEM, 0, 0);
272	return;	286	return NULL;
273	}	287	}
274	key = conn->in_phone_hash;	288	key = conn->in_phone_hash;
275	futex_down(&conn_futex);	289	futex_down(&conn_futex);
276	/* Add connection to hash table */	290	/* Add connection to hash table */
277	hash_table_insert(&conn_hash_table, &key, &conn->link);	291	hash_table_insert(&conn_hash_table, &key, &conn->link);
278	futex_up(&conn_futex);	292	futex_up(&conn_futex);
279		293
280	psthread_add_ready(conn->ptid);	294	psthread_add_ready(conn->ptid);
-		295
-		296	return conn->ptid;
281	}	297	}
282		298
283	/** Handle call to a task */	299	/** Handle call to a task */
284	static void handle_call(ipc_callid_t callid, ipc_call_t *call)	300	static void handle_call(ipc_callid_t callid, ipc_call_t *call)
285	{	301	{
286	if (route_call(callid, call))	302	if (route_call(callid, call))
287	return;	303	return;
288		304
289	switch (IPC_GET_METHOD(*call)) {	305	switch (IPC_GET_METHOD(*call)) {
290	case IPC_M_INTERRUPT:	306	case IPC_M_INTERRUPT:
291	break;	307	break;
292	case IPC_M_CONNECT_ME_TO:	308	case IPC_M_CONNECT_ME_TO:
293	/* Open new connection with thread etc. */	309	/* Open new connection with thread etc. */
294	new_connection(callid, call);	310	async_new_connection(callid, call, client_connection);
295	break;	311	break;
296	default:	312	default:
297	ipc_answer_fast(callid, EHANGUP, 0, 0);	313	ipc_answer_fast(callid, EHANGUP, 0, 0);
298	}	314	}
299	}	315	}
300		316
301	/** Endless loop dispatching incoming calls and answers */	317	/** Endless loop dispatching incoming calls and answers */
302	int async_manager()	318	int async_manager()
303	{	319	{
304	ipc_call_t call;	320	ipc_call_t call;
305	ipc_callid_t callid;	321	ipc_callid_t callid;
306		322
307	while (1) {	323	while (1) {
308	if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {	324	if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {
309	futex_up(&conn_futex); /* conn_futex is always held	325	futex_up(&conn_futex); /* conn_futex is always held
310	* when entering manager thread	326	* when entering manager thread
311	*/	327	*/
312	continue;	328	continue;
313	}	329	}
314	callid = ipc_wait_cycle(&call,SYNCH_NO_TIMEOUT,SYNCH_BLOCKING);	330	callid = ipc_wait_cycle(&call,SYNCH_NO_TIMEOUT,SYNCH_BLOCKING);
315		331
316	if (callid & IPC_CALLID_ANSWERED)	332	if (callid & IPC_CALLID_ANSWERED)
317	continue;	333	continue;
318	handle_call(callid, &call);	334	handle_call(callid, &call);
319	}	335	}
320	}	336	}
321		337
322	/** Function to start async_manager as a standalone thread	338	/** Function to start async_manager as a standalone thread
323	*	339	*
324	* When more kernel threads are used, one async manager should	340	* When more kernel threads are used, one async manager should
325	* exist per thread. The particular implementation may change,	341	* exist per thread. The particular implementation may change,
326	* currently one async_manager is started automatically per kernel	342	* currently one async_manager is started automatically per kernel
327	* thread except main thread.	343	* thread except main thread.
328	*/	344	*/
329	static int async_manager_thread(void *arg)	345	static int async_manager_thread(void *arg)
330	{	346	{
331	futex_up(&conn_futex); /* conn_futex is always locked when entering	347	futex_up(&conn_futex); /* conn_futex is always locked when entering
332	* manager */	348	* manager */
333	async_manager();	349	async_manager();
334	}	350	}
335		351
336	/** Add one manager to manager list */	352	/** Add one manager to manager list */
337	void async_create_manager(void)	353	void async_create_manager(void)
338	{	354	{
339	pstid_t ptid;	355	pstid_t ptid;
340		356
341	ptid = psthread_create(async_manager_thread, NULL);	357	ptid = psthread_create(async_manager_thread, NULL);
342	psthread_add_manager(ptid);	358	psthread_add_manager(ptid);
343	}	359	}
344		360
345	/** Remove one manager from manager list */	361	/** Remove one manager from manager list */
346	void async_destroy_manager(void)	362	void async_destroy_manager(void)
347	{	363	{
348	psthread_remove_manager();	364	psthread_remove_manager();
349	}	365	}
350		366
351	/** Initialize internal structures needed for async manager */	367	/** Initialize internal structures needed for async manager */
352	int _async_init(void)	368	int _async_init(void)
353	{	369	{
354	if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {	370	if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {
355	printf("%s: cannot create hash table\n", "async");	371	printf("%s: cannot create hash table\n", "async");
356	return ENOMEM;	372	return ENOMEM;
357	}	373	}
358		374
359	}	375	}
360		376

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(root)/uspace/trunk/libc/generic/async.c – Rev 1405 → 1407