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
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
/*
* Implementation of hooks for the CYGNUS newlib libc
* These hooks set things up so that:
* + '_REENT' is switched at task switch time.
*
* COPYRIGHT (c) 1994 by Division Incorporated
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#define __RTEMS_VIOLATE_KERNEL_VISIBILITY__
#include <rtems.h>
#if defined(RTEMS_NEWLIB)
#include <rtems/libcsupport.h>
/* Since we compile with strict ANSI we need to undef it to get
* prototypes for extensions
*/
#undef __STRICT_ANSI__
#include <stdlib.h> /* for free() */
#include <string.h> /* for memset() */
#include <sys/reent.h> /* for extern of _REENT (aka _impure_ptr) */
#include <errno.h>
/*
* NOTE:
* There is some problem with doing this on the hpux version
* of the UNIX simulator (symptom is printf core dumps), so
* we just don't for now.
* Not sure if this is a problem with hpux, newlib, or something else.
*/
#if defined(RTEMS_UNIX) && !defined(hpux)
#define NEED_SETVBUF
#endif
#include <stdio.h>
int _fwalk(struct _reent *ptr, int (*function) (FILE *) );
struct _reent libc_global_reent
__ATTRIBUTE_IMPURE_PTR__ = _REENT_INIT(libc_global_reent);
/*
* reent struct allocation moved here from libc_start_hook() to avoid
* mutual exclusion problems when memory is allocated from the start hook.
*
* Memory is also now allocated from the workspace rather than the heap.
* -- ptorre 9/30/03
*/
rtems_boolean libc_create_hook(
rtems_tcb *current_task,
rtems_tcb *creating_task
)
{
struct _reent *ptr;
/* NOTE: The RTEMS malloc is reentrant without a reent ptr since
* it is based on the Classic API Region Manager.
*/
#define REENT_MALLOCED 0
#if REENT_MALLOCED
ptr = (struct _reent *) calloc(1, sizeof(struct _reent));
#else
/* It is OK to allocate from the workspace because these
* hooks run with thread dispatching disabled.
*/
ptr = (struct _reent *) _Workspace_Allocate(sizeof(struct _reent));
#endif
if (ptr) {
_REENT_INIT_PTR((ptr)); /* GCC extension: structure constants */
creating_task->libc_reent = ptr;
return TRUE;
}
else
return FALSE;
}
/*
* Called for all user TASKS (system tasks are MPCI Receive Server and IDLE)
*/
#ifdef NEED_SETVBUF
rtems_extension libc_begin_hook(rtems_tcb *current_task)
{
setvbuf( stdout, NULL, _IOLBF, BUFSIZ );
}
#endif
/*
* Called when a task is deleted.
* Must restore the new lib reentrancy state for the new current
* task.
*
*/
int newlib_free_buffers(
FILE *fp
)
{
switch ( fileno(fp) ) {
case 0:
case 1:
case 2:
if (fp->_flags & __SMBF) {
free( fp->_bf._base );
fp->_flags &= ~__SMBF;
fp->_bf._base = fp->_p = (unsigned char *) NULL;
}
break;
default:
fclose(fp);
}
return 0;
}
rtems_extension libc_delete_hook(
rtems_tcb *current_task,
rtems_tcb *deleted_task
)
{
struct _reent *ptr;
/*
* The reentrancy structure was allocated by newlib using malloc()
*/
if (current_task == deleted_task) {
ptr = _REENT;
} else {
ptr = deleted_task->libc_reent;
}
if (ptr && ptr != &libc_global_reent) {
/*
_wrapup_reent(ptr);
_reclaim_reent(ptr);
*/
/*
* Just in case there are some buffers lying around.
*/
_fwalk(ptr, newlib_free_buffers);
#if REENT_MALLOCED
free(ptr);
#else
_Workspace_Free(ptr);
#endif
}
deleted_task->libc_reent = NULL;
/*
* Require the switch back to another task to install its own
*/
if ( current_task == deleted_task ) {
_REENT = 0;
}
}
/*
* Init libc for CYGNUS newlib
*
* Set up _REENT to use our global libc_global_reent.
* (newlib provides a global of its own, but we prefer our own name for it)
*
* If reentrancy is desired (which it should be), then
* we install the task extension hooks to maintain the
* newlib reentrancy global variable _REENT on task
* create, delete, switch, exit, etc.
*
*/
void
libc_init(int reentrant)
{
_REENT = &libc_global_reent;
_Thread_Set_libc_reent (&_REENT);
}
#endif
|
