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;
    connection_t *conn;
 
    /* Setup thread local connection pointer */
    PS_connection = (connection_t *)arg;
    conn = PS_connection;
    conn->cthread(conn->callid, &conn->call);
 
    /* Remove myself from connection hash table */
    futex_down(&conn_futex);
    key = conn->in_phone_hash;
    hash_table_remove(&conn_hash_table, &key, 1);
    futex_up(&conn_futex);
    /* Answer all remaining messages with ehangup */
    while (!list_empty(&conn->msg_queue)) {
        msg = list_get_instance(conn->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 1407	Rev 1408
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	* async_manager();	63	* async_manager();
64	* }	64	* }
65	*	65	*
66	*	66	*
67	* client_connection(icallid, *icall) {	67	* client_connection(icallid, *icall) {
68	* if (want_refuse) {	68	* if (want_refuse) {
69	* ipc_answer_fast(icallid, ELIMIT, 0, 0);	69	* ipc_answer_fast(icallid, ELIMIT, 0, 0);
70	* return;	70	* return;
71	* }	71	* }
72	* ipc_answer_fast(icallid, 0, 0, 0);	72	* ipc_answer_fast(icallid, 0, 0, 0);
73	*	73	*
74	* callid = async_get_call(&call);	74	* callid = async_get_call(&call);
75	* handle(callid, call);	75	* handle(callid, call);
76	* ipc_answer_fast(callid, 1,2,3);	76	* ipc_answer_fast(callid, 1,2,3);
77	*	77	*
78	* callid = async_get_call(&call);	78	* callid = async_get_call(&call);
79	* ....	79	* ....
80	* }	80	* }
81	*	81	*
82	* TODO: Detaching/joining dead psthreads?	82	* TODO: Detaching/joining dead psthreads?
83	*/	83	*/
84	#include <futex.h>	84	#include <futex.h>
85	#include <async.h>	85	#include <async.h>
86	#include <psthread.h>	86	#include <psthread.h>
87	#include <stdio.h>	87	#include <stdio.h>
88	#include <libadt/hash_table.h>	88	#include <libadt/hash_table.h>
89	#include <libadt/list.h>	89	#include <libadt/list.h>
90	#include <ipc/ipc.h>	90	#include <ipc/ipc.h>
91	#include <assert.h>	91	#include <assert.h>
92	#include <errno.h>	92	#include <errno.h>
93		93
94	static atomic_t conn_futex = FUTEX_INITIALIZER;	94	static atomic_t conn_futex = FUTEX_INITIALIZER;
95	static hash_table_t conn_hash_table;	95	static hash_table_t conn_hash_table;
96		96
97	typedef struct {	97	typedef struct {
98	link_t link;	98	link_t link;
99	ipc_callid_t callid;	99	ipc_callid_t callid;
100	ipc_call_t call;	100	ipc_call_t call;
101	} msg_t;	101	} msg_t;
102		102
103	typedef struct {	103	typedef struct {
104	link_t link;	104	link_t link;
105	ipcarg_t in_phone_hash; /*< Incoming phone hash. /	105	ipcarg_t in_phone_hash; /*< Incoming phone hash. /
106	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 /
107	pstid_t ptid; /*< Thread associated with this connection /	107	pstid_t ptid; /*< Thread associated with this connection /
108	int active; /*< If this thread is currently active /	108	int active; /*< If this thread is currently active /
109	/* Structures for connection opening packet */	109	/* Structures for connection opening packet */
110	ipc_callid_t callid;	110	ipc_callid_t callid;
111	ipc_call_t call;	111	ipc_call_t call;
112	void (cthread)(ipc_callid_t,ipc_call_t );	112	void (cthread)(ipc_callid_t,ipc_call_t );
113	} connection_t;	113	} connection_t;
114		114
115	__thread connection_t *PS_connection;	115	__thread connection_t *PS_connection;
116		116
117	/* Hash table functions */	117	/* Hash table functions */
118		118
119	#define CONN_HASH_TABLE_CHAINS 32	119	#define CONN_HASH_TABLE_CHAINS 32
120		120
121	static hash_index_t conn_hash(unsigned long *key)	121	static hash_index_t conn_hash(unsigned long *key)
122	{	122	{
123	assert(key);	123	assert(key);
124	return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;	124	return ((*key) >> 4) % CONN_HASH_TABLE_CHAINS;
125	}	125	}
126		126
127	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)
128	{	128	{
129	connection_t *hs;	129	connection_t *hs;
130		130
131	hs = hash_table_get_instance(item, connection_t, link);	131	hs = hash_table_get_instance(item, connection_t, link);
132		132
133	return key[0] == hs->in_phone_hash;	133	return key[0] == hs->in_phone_hash;
134	}	134	}
135		135
136	static void conn_remove(link_t *item)	136	static void conn_remove(link_t *item)
137	{	137	{
138	free(hash_table_get_instance(item, connection_t, link));	138	free(hash_table_get_instance(item, connection_t, link));
139	}	139	}
140		140
141		141
142	/** Operations for NS hash table. */	142	/** Operations for NS hash table. */
143	static hash_table_operations_t conn_hash_table_ops = {	143	static hash_table_operations_t conn_hash_table_ops = {
144	.hash = conn_hash,	144	.hash = conn_hash,
145	.compare = conn_compare,	145	.compare = conn_compare,
146	.remove_callback = conn_remove	146	.remove_callback = conn_remove
147	};	147	};
148		148
149	/** Try to route a call to an appropriate connection thread	149	/** Try to route a call to an appropriate connection thread
150	*	150	*
151	*/	151	*/
152	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)
153	{	153	{
154	connection_t *conn;	154	connection_t *conn;
155	msg_t *msg;	155	msg_t *msg;
156	link_t *hlp;	156	link_t *hlp;
157	unsigned long key;	157	unsigned long key;
158		158
159	futex_down(&conn_futex);	159	futex_down(&conn_futex);
160		160
161	key = call->in_phone_hash;	161	key = call->in_phone_hash;
162	hlp = hash_table_find(&conn_hash_table, &key);	162	hlp = hash_table_find(&conn_hash_table, &key);
163	if (!hlp) {	163	if (!hlp) {
164	futex_up(&conn_futex);	164	futex_up(&conn_futex);
165	return 0;	165	return 0;
166	}	166	}
167	conn = hash_table_get_instance(hlp, connection_t, link);	167	conn = hash_table_get_instance(hlp, connection_t, link);
168		168
169	msg = malloc(sizeof(*msg));	169	msg = malloc(sizeof(*msg));
170	msg->callid = callid;	170	msg->callid = callid;
171	msg->call = *call;	171	msg->call = *call;
172	list_append(&msg->link, &conn->msg_queue);	172	list_append(&msg->link, &conn->msg_queue);
173		173
174	if (!conn->active) {	174	if (!conn->active) {
175	conn->active = 1;	175	conn->active = 1;
176	psthread_add_ready(conn->ptid);	176	psthread_add_ready(conn->ptid);
177	}	177	}
178		178
179	futex_up(&conn_futex);	179	futex_up(&conn_futex);
180		180
181	return 1;	181	return 1;
182	}	182	}
183		183
184	/** Return new incoming message for current(thread-local) connection */	184	/** Return new incoming message for current(thread-local) connection */
185	ipc_callid_t async_get_call(ipc_call_t *call)	185	ipc_callid_t async_get_call(ipc_call_t *call)
186	{	186	{
187	msg_t *msg;	187	msg_t *msg;
188	ipc_callid_t callid;	188	ipc_callid_t callid;
189	connection_t *conn;	189	connection_t *conn;
190		190
191	futex_down(&conn_futex);	191	futex_down(&conn_futex);
192		192
193	conn = PS_connection;	193	conn = PS_connection;
194	/* If nothing in queue, wait until something appears */	194	/* If nothing in queue, wait until something appears */
195	if (list_empty(&conn->msg_queue)) {	195	if (list_empty(&conn->msg_queue)) {
196	conn->active = 0;	196	conn->active = 0;
197	psthread_schedule_next_adv(PS_TO_MANAGER);	197	psthread_schedule_next_adv(PS_TO_MANAGER);
198	}	198	}
199		199
200	msg = list_get_instance(conn->msg_queue.next, msg_t, link);	200	msg = list_get_instance(conn->msg_queue.next, msg_t, link);
201	list_remove(&msg->link);	201	list_remove(&msg->link);
202	callid = msg->callid;	202	callid = msg->callid;
203	*call = msg->call;	203	*call = msg->call;
204	free(msg);	204	free(msg);
205		205
206	futex_up(&conn_futex);	206	futex_up(&conn_futex);
207	return callid;	207	return callid;
208	}	208	}
209		209
210	/** Thread function that gets created on new connection	210	/** Thread function that gets created on new connection
211	*	211	*
212	* 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
213	* user code.	213	* user code.
214	*/	214	*/
215	void client_connection(ipc_callid_t callid, ipc_call_t *call)	215	void client_connection(ipc_callid_t callid, ipc_call_t *call)
216	{	216	{
217	ipc_answer_fast(callid, ENOENT, 0, 0);	217	ipc_answer_fast(callid, ENOENT, 0, 0);
218	}	218	}
219		219
220	/** Wrapper for client connection thread	220	/** Wrapper for client connection thread
221	*	221	*
222	* When new connection arrives, thread with this function is created.	222	* When new connection arrives, thread with this function is created.
223	* It calls client_connection and does final cleanup.	223	* It calls client_connection and does final cleanup.
224	*	224	*
225	* @parameter arg Connection structure pointer	225	* @parameter arg Connection structure pointer
226	*/	226	*/
227	static int connection_thread(void *arg)	227	static int connection_thread(void *arg)
228	{	228	{
229	unsigned long key;	229	unsigned long key;
230	msg_t *msg;	230	msg_t *msg;
-		231	connection_t *conn;
231		232
232	/* Setup thread local connection pointer */	233	/* Setup thread local connection pointer */
233	PS_connection = (connection_t *)arg;	234	PS_connection = (connection_t *)arg;
-		235	conn = PS_connection;
234	PS_connection->cthread(PS_connection->callid, &PS_connection->call);	236	conn->cthread(conn->callid, &conn->call);
235		237
236	/* Remove myself from connection hash table */	238	/* Remove myself from connection hash table */
237	futex_down(&conn_futex);	239	futex_down(&conn_futex);
238	key = PS_connection->in_phone_hash;	240	key = conn->in_phone_hash;
239	hash_table_remove(&conn_hash_table, &key, 1);	241	hash_table_remove(&conn_hash_table, &key, 1);
240	futex_up(&conn_futex);	242	futex_up(&conn_futex);
241	/* Answer all remaining messages with ehangup */	243	/* Answer all remaining messages with ehangup */
242	while (!list_empty(&PS_connection->msg_queue)) {	244	while (!list_empty(&conn->msg_queue)) {
243	msg = list_get_instance(PS_connection->msg_queue.next, msg_t, link);	245	msg = list_get_instance(conn->msg_queue.next, msg_t, link);
244	list_remove(&msg->link);	246	list_remove(&msg->link);
245	ipc_answer_fast(msg->callid, EHANGUP, 0, 0);	247	ipc_answer_fast(msg->callid, EHANGUP, 0, 0);
246	free(msg);	248	free(msg);
247	}	249	}
248	}	250	}
249		251
250	/** Create new thread for a new connection	252	/** Create new thread for a new connection
251	*	253	*
252	* Creates new thread for connection, fills in connection	254	* Creates new thread for connection, fills in connection
253	* structures and inserts it into the hash table, so that	255	* structures and inserts it into the hash table, so that
254	* later we can easily do routing of messages to particular	256	* later we can easily do routing of messages to particular
255	* threads.	257	* threads.
256	*	258	*
257	* @param callid Callid of the IPC_M_CONNECT_ME_TO packet	259	* @param callid Callid of the IPC_M_CONNECT_ME_TO packet
258	* @param call Call data of the opening packet	260	* @param call Call data of the opening packet
259	* @param cthread Thread function that should be called upon	261	* @param cthread Thread function that should be called upon
260	* opening the connection	262	* opening the connection
261	* @return New thread id	263	* @return New thread id
262	*/	264	*/
263	pstid_t async_new_connection(ipc_callid_t callid, ipc_call_t *call,	265	pstid_t async_new_connection(ipc_callid_t callid, ipc_call_t *call,
264	void (cthread)(ipc_callid_t,ipc_call_t ))	266	void (cthread)(ipc_callid_t,ipc_call_t ))
265	{	267	{
266	pstid_t ptid;	268	pstid_t ptid;
267	connection_t *conn;	269	connection_t *conn;
268	unsigned long key;	270	unsigned long key;
269		271
270	conn = malloc(sizeof(*conn));	272	conn = malloc(sizeof(*conn));
271	if (!conn) {	273	if (!conn) {
272	ipc_answer_fast(callid, ENOMEM, 0, 0);	274	ipc_answer_fast(callid, ENOMEM, 0, 0);
273	return NULL;	275	return NULL;
274	}	276	}
275	conn->in_phone_hash = IPC_GET_ARG3(*call);	277	conn->in_phone_hash = IPC_GET_ARG3(*call);
276	list_initialize(&conn->msg_queue);	278	list_initialize(&conn->msg_queue);
277	conn->ptid = psthread_create(connection_thread, conn);	279	conn->ptid = psthread_create(connection_thread, conn);
278	conn->callid = callid;	280	conn->callid = callid;
279	conn->call = *call;	281	conn->call = *call;
280	conn->active = 1; /* We will activate it asap */	282	conn->active = 1; /* We will activate it asap */
281	conn->cthread = cthread;	283	conn->cthread = cthread;
282	list_initialize(&conn->link);	284	list_initialize(&conn->link);
283	if (!conn->ptid) {	285	if (!conn->ptid) {
284	free(conn);	286	free(conn);
285	ipc_answer_fast(callid, ENOMEM, 0, 0);	287	ipc_answer_fast(callid, ENOMEM, 0, 0);
286	return NULL;	288	return NULL;
287	}	289	}
288	key = conn->in_phone_hash;	290	key = conn->in_phone_hash;
289	futex_down(&conn_futex);	291	futex_down(&conn_futex);
290	/* Add connection to hash table */	292	/* Add connection to hash table */
291	hash_table_insert(&conn_hash_table, &key, &conn->link);	293	hash_table_insert(&conn_hash_table, &key, &conn->link);
292	futex_up(&conn_futex);	294	futex_up(&conn_futex);
293		295
294	psthread_add_ready(conn->ptid);	296	psthread_add_ready(conn->ptid);
295		297
296	return conn->ptid;	298	return conn->ptid;
297	}	299	}
298		300
299	/** Handle call to a task */	301	/** Handle call to a task */
300	static void handle_call(ipc_callid_t callid, ipc_call_t *call)	302	static void handle_call(ipc_callid_t callid, ipc_call_t *call)
301	{	303	{
302	if (route_call(callid, call))	304	if (route_call(callid, call))
303	return;	305	return;
304		306
305	switch (IPC_GET_METHOD(*call)) {	307	switch (IPC_GET_METHOD(*call)) {
306	case IPC_M_INTERRUPT:	308	case IPC_M_INTERRUPT:
307	break;	309	break;
308	case IPC_M_CONNECT_ME_TO:	310	case IPC_M_CONNECT_ME_TO:
309	/* Open new connection with thread etc. */	311	/* Open new connection with thread etc. */
310	async_new_connection(callid, call, client_connection);	312	async_new_connection(callid, call, client_connection);
311	break;	313	break;
312	default:	314	default:
313	ipc_answer_fast(callid, EHANGUP, 0, 0);	315	ipc_answer_fast(callid, EHANGUP, 0, 0);
314	}	316	}
315	}	317	}
316		318
317	/** Endless loop dispatching incoming calls and answers */	319	/** Endless loop dispatching incoming calls and answers */
318	int async_manager()	320	int async_manager()
319	{	321	{
320	ipc_call_t call;	322	ipc_call_t call;
321	ipc_callid_t callid;	323	ipc_callid_t callid;
322		324
323	while (1) {	325	while (1) {
324	if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {	326	if (psthread_schedule_next_adv(PS_FROM_MANAGER)) {
325	futex_up(&conn_futex); /* conn_futex is always held	327	futex_up(&conn_futex); /* conn_futex is always held
326	* when entering manager thread	328	* when entering manager thread
327	*/	329	*/
328	continue;	330	continue;
329	}	331	}
330	callid = ipc_wait_cycle(&call,SYNCH_NO_TIMEOUT,SYNCH_BLOCKING);	332	callid = ipc_wait_cycle(&call,SYNCH_NO_TIMEOUT,SYNCH_BLOCKING);
331		333
332	if (callid & IPC_CALLID_ANSWERED)	334	if (callid & IPC_CALLID_ANSWERED)
333	continue;	335	continue;
334	handle_call(callid, &call);	336	handle_call(callid, &call);
335	}	337	}
336	}	338	}
337		339
338	/** Function to start async_manager as a standalone thread	340	/** Function to start async_manager as a standalone thread
339	*	341	*
340	* When more kernel threads are used, one async manager should	342	* When more kernel threads are used, one async manager should
341	* exist per thread. The particular implementation may change,	343	* exist per thread. The particular implementation may change,
342	* currently one async_manager is started automatically per kernel	344	* currently one async_manager is started automatically per kernel
343	* thread except main thread.	345	* thread except main thread.
344	*/	346	*/
345	static int async_manager_thread(void *arg)	347	static int async_manager_thread(void *arg)
346	{	348	{
347	futex_up(&conn_futex); /* conn_futex is always locked when entering	349	futex_up(&conn_futex); /* conn_futex is always locked when entering
348	* manager */	350	* manager */
349	async_manager();	351	async_manager();
350	}	352	}
351		353
352	/** Add one manager to manager list */	354	/** Add one manager to manager list */
353	void async_create_manager(void)	355	void async_create_manager(void)
354	{	356	{
355	pstid_t ptid;	357	pstid_t ptid;
356		358
357	ptid = psthread_create(async_manager_thread, NULL);	359	ptid = psthread_create(async_manager_thread, NULL);
358	psthread_add_manager(ptid);	360	psthread_add_manager(ptid);
359	}	361	}
360		362
361	/** Remove one manager from manager list */	363	/** Remove one manager from manager list */
362	void async_destroy_manager(void)	364	void async_destroy_manager(void)
363	{	365	{
364	psthread_remove_manager();	366	psthread_remove_manager();
365	}	367	}
366		368
367	/** Initialize internal structures needed for async manager */	369	/** Initialize internal structures needed for async manager */
368	int _async_init(void)	370	int _async_init(void)
369	{	371	{
370	if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {	372	if (!hash_table_create(&conn_hash_table, CONN_HASH_TABLE_CHAINS, 1, &conn_hash_table_ops)) {
371	printf("%s: cannot create hash table\n", "async");	373	printf("%s: cannot create hash table\n", "async");
372	return ENOMEM;	374	return ENOMEM;
373	}	375	}
374		376
375	}	377	}
376		378

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(root)/uspace/trunk/libc/generic/async.c – Rev 1407 → 1408