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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
//===========================================================================
//
// compatmode.cxx
//
// Compatibility mode setting for Math library
//
//===========================================================================
// ####ECOSGPLCOPYRIGHTBEGIN####
// -------------------------------------------
// This file is part of eCos, the Embedded Configurable Operating System.
// Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
//
// eCos 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.
//
// eCos 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 eCos; if not, write to the Free Software Foundation, Inc.,
// 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// As a special exception, if other files instantiate templates or use
// macros or inline functions from this file, or you compile this file
// and link it with other works to produce a work based on this file,
// this file does not by itself cause the resulting work to be covered by
// the GNU General Public License. However the source code for this file
// must still be made available in accordance with section (3) of the GNU
// General Public License v2.
//
// This exception does not invalidate any other reasons why a work based
// on this file might be covered by the GNU General Public License.
// -------------------------------------------
// ####ECOSGPLCOPYRIGHTEND####
//===========================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s): jlarmour
// Contributors: jlarmour
// Date: 1998-02-13
// Purpose:
// Description: Contains the accessor functions to get and set the standards
// compatibility mode of the Math library
// Usage:
//
//####DESCRIPTIONEND####
//
//===========================================================================
// CONFIGURATION
#include <pkgconf/libm.h> // Configuration header
// Include the Math library?
#ifdef CYGPKG_LIBM
// INCLUDES
#include <cyg/infra/cyg_type.h> // Common type definitions and support
#include <cyg/infra/cyg_trac.h> // Tracing macros
#include <math.h> // Main header for math library
#ifdef CYGSEM_LIBM_THREAD_SAFE_COMPAT_MODE
# include <pkgconf/kernel.h> // Kernel configuration
# include <cyg/kernel/thread.hxx> // Kernel thread header
# include <cyg/kernel/thread.inl> // and its associated inlines
# include <cyg/kernel/mutex.hxx> // We need mutexes too
#endif
// GLOBAL VARIABLES
#ifndef CYGSEM_LIBM_THREAD_SAFE_COMPAT_MODE
# ifdef CYGSEM_LIBM_COMPAT_IEEE_ONLY
Cyg_libm_compat_t cygvar_libm_compat_mode = CYGNUM_LIBM_COMPAT_IEEE;
# else
Cyg_libm_compat_t cygvar_libm_compat_mode = CYGNUM_LIBM_COMPAT_DEFAULT;
# endif
#else // ifndef CYGSEM_LIBM_THREAD_SAFE_COMPAT_MODE
static Cyg_Mutex cyg_libm_mode_thread_data_index_mutex;
static cyg_count32 cyg_libm_mode_thread_data_index = CYGNUM_KERNEL_THREADS_DATA_MAX;
# if defined(CYGDBG_USE_TRACING) && \
defined(CYGNUM_LIBM_COMPATMODE_TRACE_LEVEL)
static int libm_compatmode_trace = CYGNUM_LIBM_COMPATMODE_TRACE_LEVEL;
# define TL1 (0 < libm_compatmode_trace )
# else
# define TL1 (0)
# endif
// FUNCTIONS
Cyg_libm_compat_t
cyg_libm_get_compat_mode( void )
{
Cyg_Thread *self = Cyg_Thread::self();
CYG_ADDRWORD current_val;
CYG_REPORT_FUNCNAMETYPE( "Cyg_libm_get_compat_mode", "mode is %d" );
// First check if this is the first thread to get here, and if so,
// initialise the thread data index
if (cyg_libm_mode_thread_data_index == CYGNUM_KERNEL_THREADS_DATA_MAX)
{
CYG_TRACE0( TL1, "Index unset, locking mutex to allocate" );
// Lock mutex and then check again - less overhead for normal
// execution path
cyg_libm_mode_thread_data_index_mutex.lock();
if (cyg_libm_mode_thread_data_index == CYGNUM_KERNEL_THREADS_DATA_MAX)
{
CYG_TRACE0( TL1, "Allocating index" );
cyg_libm_mode_thread_data_index = self->new_data_index();
} // if
cyg_libm_mode_thread_data_index_mutex.unlock();
self->set_data( cyg_libm_mode_thread_data_index,
CYGNUM_LIBM_COMPAT_DEFAULT );
// But if we've gone through this, then we know what the mode is!
CYG_REPORT_RETVAL( CYGNUM_LIBM_COMPAT_DEFAULT );
return CYGNUM_LIBM_COMPAT_DEFAULT;
} // if
CYG_TRACE0( TL1, "Index set, now fetching per-thread data" );
// If we're here, then the index is set up
current_val = self->get_data( cyg_libm_mode_thread_data_index );
// If its at the "default" setting, then return the default
if (current_val == CYGNUM_LIBM_COMPAT_UNINIT)
{
CYG_REPORT_RETVAL( CYGNUM_LIBM_COMPAT_DEFAULT );
return CYGNUM_LIBM_COMPAT_DEFAULT;
} // if
CYG_REPORT_RETVAL( current_val );
return (Cyg_libm_compat_t) current_val;
} // cyg_libm_get_compat_mode()
Cyg_libm_compat_t
cyg_libm_set_compat_mode( Cyg_libm_compat_t new_mode )
{
Cyg_Thread *self = Cyg_Thread::self();
CYG_ADDRWORD current_val;
CYG_REPORT_FUNCNAMETYPE( "Cyg_libm_set_compat_mode", "old mode was %d" );
CYG_REPORT_FUNCARG1DV( new_mode );
// First check if this is the first thread to get here, and if so,
// initialise the thread data index
if (cyg_libm_mode_thread_data_index == CYGNUM_KERNEL_THREADS_DATA_MAX)
{
CYG_TRACE0( TL1, "Index unset, locking mutex to allocate" );
// Lock mutex and then check again - less overhead for normal
// execution path
cyg_libm_mode_thread_data_index_mutex.lock();
if (cyg_libm_mode_thread_data_index == CYGNUM_KERNEL_THREADS_DATA_MAX)
{
CYG_TRACE0( TL1, "Allocating index" );
cyg_libm_mode_thread_data_index = self->new_data_index();
} // if
cyg_libm_mode_thread_data_index_mutex.unlock();
self->set_data( cyg_libm_mode_thread_data_index,
new_mode );
// But if we've gone through this, then we know what the old mode was!
CYG_REPORT_RETVAL( CYGNUM_LIBM_COMPAT_UNINIT );
return CYGNUM_LIBM_COMPAT_UNINIT;
} // if
// If we're here, then the index is set up
CYG_TRACE0( TL1, "Index set, now fetching per-thread data" );
current_val = self->get_data( cyg_libm_mode_thread_data_index );
self->set_data( cyg_libm_mode_thread_data_index,
new_mode );
CYG_REPORT_RETVAL( current_val );
return (Cyg_libm_compat_t) current_val;
} // cyg_libm_set_compat_mode()
#endif // ifdef CYGSEM_LIBM_THREAD_SAFE_COMPAT_MODE
#endif // ifdef CYGPKG_LIBM
// EOF compatmode.cxx
|
