Subversion Repositories HelenOS-historic

Rev

Rev 959 | Rev 980 | Go to most recent revision | Details | Compare with Previous | Last modification | View Log | RSS feed

Rev Author Line No. Line
955 palkovsky 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
/* Lock ordering
30
 *
31
 * First the answerbox, then the phone
32
 */
33
 
965 palkovsky 34
#include <synch/condvar.h>
35
#include <synch/mutex.h>
955 palkovsky 36
#include <ipc/ipc.h>
37
#include <errno.h>
38
#include <mm/slab.h>
39
#include <arch.h>
40
#include <proc/task.h>
41
#include <memstr.h>
42
#include <debug.h>
43
 
44
#include <print.h>
45
#include <proc/thread.h>
46
 
965 palkovsky 47
/* Open channel that is assigned automatically to new tasks */
48
answerbox_t *ipc_phone_0 = NULL;
955 palkovsky 49
 
50
static slab_cache_t *ipc_call_slab;
51
 
52
/** Allocate & initialize call structure
53
 *
54
 * The call is initialized, so that the reply will be directed
55
 * to TASK->answerbox
56
 */
57
call_t * ipc_call_alloc(void)
58
{
59
    call_t *call;
60
 
61
    call = slab_alloc(ipc_call_slab, 0);
62
    memsetb((__address)call, sizeof(*call), 0);
63
    call->callerbox = &TASK->answerbox;
64
 
65
    return call;
66
}
67
 
965 palkovsky 68
/** Initialize allocated call */
69
void ipc_call_init(call_t *call)
70
{
71
    call->callerbox = &TASK->answerbox;
72
    call->flags = IPC_CALL_STATIC_ALLOC;
73
}
74
 
955 palkovsky 75
/** Deallocate call stracuture */
76
void ipc_call_free(call_t *call)
77
{
78
    slab_free(ipc_call_slab, call);
79
}
80
 
81
/** Initialize answerbox structure
82
 */
83
void ipc_answerbox_init(answerbox_t *box)
84
{
965 palkovsky 85
    mutex_initialize(&box->mutex);
86
    condvar_initialize(&box->cv);
955 palkovsky 87
    list_initialize(&box->connected_phones);
88
    list_initialize(&box->calls);
89
    list_initialize(&box->dispatched_calls);
90
    list_initialize(&box->answers);
91
}
92
 
93
/** Initialize phone structure and connect phone to naswerbox
94
 */
95
void ipc_phone_init(phone_t *phone, answerbox_t *box)
96
{
97
    spinlock_initialize(&phone->lock, "phone_lock");
98
 
99
    phone->callee = box;
965 palkovsky 100
 
101
    mutex_lock(&box->mutex);
955 palkovsky 102
    list_append(&phone->list, &box->connected_phones);
965 palkovsky 103
    mutex_unlock(&box->mutex);
955 palkovsky 104
}
105
 
106
/** Disconnect phone from answerbox */
107
void ipc_phone_destroy(phone_t *phone)
108
{
109
    answerbox_t *box = phone->callee;
110
 
111
    ASSERT(box);
112
 
965 palkovsky 113
    mutex_lock(&box->mutex);
955 palkovsky 114
    list_remove(&phone->list);
965 palkovsky 115
    mutex_unlock(&box->mutex);
955 palkovsky 116
}
117
 
959 palkovsky 118
/** Helper function to facilitate synchronous calls */
119
void ipc_call_sync(phone_t *phone, call_t *request)
120
{
121
    answerbox_t sync_box;
955 palkovsky 122
 
959 palkovsky 123
    ipc_answerbox_init(&sync_box);
124
 
125
    /* We will receive data on special box */
126
    request->callerbox = &sync_box;
127
 
128
    ipc_call(phone, request);
129
    ipc_wait_for_call(&sync_box, 0);
130
}
131
 
132
/** Send a asynchronous request using phone to answerbox
955 palkovsky 133
 *
134
 * @param phone Phone connected to answerbox
135
 * @param request Request to be sent
136
 */
137
void ipc_call(phone_t *phone, call_t *request)
138
{
139
    answerbox_t *box = phone->callee;
140
 
141
    ASSERT(box);
142
 
965 palkovsky 143
    mutex_lock(&box->mutex);
955 palkovsky 144
    list_append(&request->list, &box->calls);
965 palkovsky 145
    mutex_unlock(&box->mutex);
146
    condvar_signal(&box->cv);
955 palkovsky 147
}
148
 
149
/** Answer message back to phone
150
 *
151
 * @param box Answerbox that is answering the message
152
 * @param request Modified request that is being sent back
153
 */
154
void ipc_answer(answerbox_t *box, call_t *request)
155
{
156
    answerbox_t *callerbox = request->callerbox;
157
 
158
    request->flags |= IPC_CALL_ANSWERED;
159
 
965 palkovsky 160
    mutex_lock(&box->mutex);
161
    list_remove(&request->list);
162
    mutex_unlock(&box->mutex);
955 palkovsky 163
 
965 palkovsky 164
    mutex_lock(&callerbox->mutex);
955 palkovsky 165
    list_append(&request->list, &callerbox->answers);
965 palkovsky 166
    mutex_unlock(&callerbox->mutex);
167
    condvar_signal(&callerbox->cv);
955 palkovsky 168
}
169
 
170
/** Wait for phone call
171
 *
172
 * @return Recived message address
173
 * - to distinguish between call and answer, look at call->flags
174
 */
175
call_t * ipc_wait_for_call(answerbox_t *box, int flags)
176
{
177
    call_t *request;
178
 
965 palkovsky 179
    mutex_lock(&box->mutex);
180
    while (1) {
181
        if (!list_empty(&box->answers)) {
182
            /* Handle asynchronous answers */
183
            request = list_get_instance(box->answers.next, call_t, list);
184
            list_remove(&request->list);
185
        } else if (!list_empty(&box->calls)) {
186
            /* Handle requests */
187
            request = list_get_instance(box->calls.next, call_t, list);
188
            list_remove(&request->list);
189
            /* Append request to dispatch queue */
190
            list_append(&request->list, &box->dispatched_calls);
191
        } else {
192
            if (!(flags & IPC_WAIT_NONBLOCKING)) {
193
                condvar_wait(&box->cv, &box->mutex);
194
                continue;
195
            }
196
            if (condvar_trywait(&box->cv, &box->mutex) != ESYNCH_WOULD_BLOCK)
197
                continue;
198
            request = NULL;
199
        }
200
        break;
955 palkovsky 201
    }
965 palkovsky 202
    mutex_unlock(&box->mutex);
955 palkovsky 203
    return request;
204
}
205
 
206
/** Initilize ipc subsystem */
207
void ipc_init(void)
208
{
209
    ipc_call_slab = slab_cache_create("ipc_call",
210
                      sizeof(call_t),
211
                      0,
212
                      NULL, NULL, 0);
213
}