1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
/* Implement tasking-related runtime actions for CHILL.
Copyright (C) 1992,1993 Free Software Foundation, Inc.
Author: Wilfried Moser
This file is part of GNU CC.
GNU CC is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
GNU CC is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU CC; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
/* As a special exception, if you link this library with other files,
some of which are compiled with GCC, to produce an executable,
this library does not by itself cause the resulting executable
to be covered by the GNU General Public License.
This exception does not however invalidate any other reasons why
the executable file might be covered by the GNU General Public License. */
#include <string.h>
#include "rtltypes.h"
#include "rts.h"
EXCEPTION (sendfail);
extern void __cause_ex1 (char *ex, char *file, int lineno);
#define CAUSE_SENDFAIL __cause_ex1 ("sendfail", filename, lineno)
/*
* function __send_buffer
*
* parameters:
* buffer pointer to buffer descriptor
* data pointer to data descriptor
* prio priority for send action
* timeout pointer to timeout value
* filename source file name where function gets called
* lineno linenumber in source file
*
* returns:
* int 0 .. success
* 1 .. timeout
*
* exceptions:
* sendfail
*
* abstract:
* implement the CHILL SEND buffer action.
*/
int
__send_buffer (buffer, data, prio, timeout, filename, lineno)
Buffer_Descr *buffer;
Data_Descr *data;
int prio;
void *timeout;
char *filename;
int lineno;
{
Buffer_Queue *bq;
Buffer_Send_Queue *bsq, *bsq_entry, *prev_bsq_entry;
int cnt = 0;
int retval = 0;
/* if we don't have anything queued on that buffer,
set up the structure */
memcpy (&bq, buffer->buf, sizeof (Buffer_Queue *));
if (bq == 0)
{
MALLOC (bq, sizeof (Buffer_Queue));
memset (bq, 0, sizeof (Buffer_Queue));
memcpy (buffer->buf, &bq, sizeof (Buffer_Queue *));
}
/* look if there is a process delayed on that buffer */
if (bq->waitqueue != 0)
{
Buffer_Wait_Queue *listentry;
/* there is already a processes waiting for that buffer,
check datalength and copy the data in */
if (bq->waitqueue->datalen < data->length)
CAUSE_SENDFAIL;
memcpy (bq->waitqueue->dataptr, data->ptr, data->length);
/* set up the entry */
bq->waitqueue->is_sent = 1;
bq->waitqueue->who_sent = THIS;
/* continue waiting process */
__continue_that (bq->waitqueue->this, prio, filename, lineno);
/* now dequeue all entries of this list */
listentry = bq->waitqueue->startlist;
while (listentry != 0)
{
Buffer_Wait_Queue *tmp, *prev_entry, *bwq;
Buffer_Queue *bq;
tmp = listentry->chain;
memcpy (&bq, listentry->bufferaddr, sizeof (Buffer_Queue *));
prev_entry = (Buffer_Wait_Queue *)&bq->waitqueue;
bwq = bq->waitqueue;
while (bwq != listentry)
{
prev_entry = bwq;
bwq = bwq->forward;
}
/* dequeue it */
prev_entry->forward = bwq->forward;
bq->waitqueuelength--;
listentry = tmp;
}
/* all done */
return 0;
}
/* nothing in waitqueue, set up an entry for sendqueue.
Note: we allocate here space for the data too, to reduce
calls to malloc and let the dataptr point just behind
the Buffer_Send_Queue structure. */
MALLOC (bsq_entry, sizeof (Buffer_Send_Queue) + data->length);
memset (bsq_entry, 0, sizeof (Buffer_Send_Queue));
bsq_entry->priority = prio;
bsq_entry->this = THIS;
bsq_entry->datalen = data->length;
bsq_entry->dataptr = bsq_entry + 1;
memcpy (bsq_entry->dataptr, data->ptr, data->length);
/* add entry to sendqueue */
prev_bsq_entry = (Buffer_Send_Queue *)&bq->sendqueue;
bsq = bq->sendqueue;
while (bsq != 0 && bsq->priority >= prio)
{
prev_bsq_entry = bsq;
bsq = bsq->forward;
}
if (bsq == 0)
{
/* beginning or end of the list */
prev_bsq_entry->forward = bsq_entry;
}
else
{
/* somewhere in the middle */
bsq_entry->forward = prev_bsq_entry->forward;
prev_bsq_entry->forward = bsq_entry;
}
if (buffer->maxqueuelength != (unsigned long)-1L &&
bq->sendqueuelength >= buffer->maxqueuelength)
{
/* we have to delay this process */
bsq_entry->is_delayed = 1;
retval = __delay_this (wait_buffer_send, timeout, filename, lineno);
if (retval)
{
prev_bsq_entry->forward = bsq_entry->forward;
FREE (bsq_entry);
}
}
else
/* just say that there is one more entry in the queue */
bq->sendqueuelength++;
return retval;
}
/* force function __print_buffer to be linked */
extern void __print_buffer ();
static EntryPoint pev = __print_buffer;
|
