Mercurial > ecos

annotate packages/io/fileio/current/src/select.cxx @ 174:38892b97b685

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Merge from eCos master repository on 2001-07-28-00:17:32-BST
author jlarmour
date Sun, 29 Jul 2001 02:00:07 +0000
parents 0c2b7be0d798
children e0c0827131d1
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
1 //==========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
2 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
3 // select.cxx
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
4 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
5 // Fileio select() support
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
6 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
7 //==========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
8 //####COPYRIGHTBEGIN####
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
9 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
10 // -------------------------------------------
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
11 // The contents of this file are subject to the Red Hat eCos Public License
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
12 // Version 1.1 (the "License"); you may not use this file except in
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
13 // compliance with the License. You may obtain a copy of the License at
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
14 // http://www.redhat.com/
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
15 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
16 // Software distributed under the License is distributed on an "AS IS"
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
18 // License for the specific language governing rights and limitations under
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
19 // the License.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
20 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
21 // The Original Code is eCos - Embedded Configurable Operating System,
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
22 // released September 30, 1998.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
23 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
24 // The Initial Developer of the Original Code is Red Hat.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
25 // Portions created by Red Hat are
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
27 // All Rights Reserved.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
28 // -------------------------------------------
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
29 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
30 //####COPYRIGHTEND####
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
31 //==========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
32 //#####DESCRIPTIONBEGIN####
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
33 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
34 // Author(s): nickg
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
35 // Contributors: nickg
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
36 // Date: 2000-05-25
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
37 // Purpose: Fileio select() support
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
38 // Description: Support for select().
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
39 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
40 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
41 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
42 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
43 //####DESCRIPTIONEND####
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
44 //
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
45 //==========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
46
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
47 #include <pkgconf/hal.h>
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
48 #include <pkgconf/kernel.h>
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
49 #include <pkgconf/io_fileio.h>
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
50
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
51 #include <cyg/kernel/ktypes.h> // base kernel types
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
52 #include <cyg/infra/cyg_trac.h> // tracing macros
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
53 #include <cyg/infra/cyg_ass.h> // assertion macros
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
54
174
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents: 128
diff changeset
55 #include <stdarg.h> // for fcntl()
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
56
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
57 #include "fio.h" // Private header
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
58
174
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents: 128
diff changeset
59 #include <sys/select.h> // select header
38892b97b685 Merge from eCos master repository on 2001-07-28-00:17:32-BST
jlarmour
parents: 128
diff changeset
60
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
61 #include <cyg/kernel/sched.hxx> // scheduler definitions
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
62 #include <cyg/kernel/thread.hxx> // thread definitions
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
63 #include <cyg/kernel/mutex.hxx> // mutex definitions
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
64 #include <cyg/kernel/clock.hxx> // clock definitions
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
65
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
66 #include <cyg/kernel/sched.inl>
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
67 #include <cyg/kernel/thread.inl>
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
68 #include <cyg/kernel/clock.inl>
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
69
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
70 //==========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
71 // File object locking
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
72
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
73 #define LOCK_FILE( fp ) cyg_file_lock( fp )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
74
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
75 #define UNLOCK_FILE( fp ) cyg_file_unlock( fp )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
76
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
77 //==========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
78 // Local variables
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
79
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
80 // Mutex for serializing select processing. This essntially controls
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
81 // access to the contents of the selinfo structures embedded in the
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
82 // client system data structures.
126
518f42066aba Merge from eCos master repository on 2000-09-19-06:25:26-BST
jlarmour
parents: 119
diff changeset
83 static Cyg_Mutex select_mutex CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_IO);
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
84
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
85 // Condition variable where any thread that is waiting for a select to
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
86 // fire is suspended. Note that select is not intended to be a real time
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
87 // operation. Whenever any selectable event occurs, all selecting threads
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
88 // will be resumed. They must then rescan their selectees and resuspend if
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
89 // necessary.
126
518f42066aba Merge from eCos master repository on 2000-09-19-06:25:26-BST
jlarmour
parents: 119
diff changeset
90 static Cyg_Condition_Variable selwait( select_mutex ) CYGBLD_ATTRIB_INIT_PRI(CYG_INIT_IO);
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
91
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
92 static volatile cyg_uint32 selwake_count = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
93
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
94 //==========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
95 // Timeval to ticks conversion support
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
96
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
97 // Converters from sec and us to ticks
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
98 static struct Cyg_Clock::converter us_converter, sec_converter;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
99
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
100 static cyg_bool converters_initialized = false;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
101
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
102 externC cyg_tick_count cyg_timeval_to_ticks( const struct timeval *tv )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
103 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
104 if( !converters_initialized )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
105 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
106 // Create the converters we need.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
107 Cyg_Clock::real_time_clock->get_other_to_clock_converter( 1000, &us_converter );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
108 Cyg_Clock::real_time_clock->get_other_to_clock_converter( 1000000000, &sec_converter );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
109
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
110 converters_initialized = true;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
111 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
112
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
113 // Short circuit zero timeval
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
114 if( tv->tv_sec == 0 && tv->tv_usec == 0 )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
115 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
116 return 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
117 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
118
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
119 // Convert the seconds field to ticks.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
120 cyg_tick_count ticks = Cyg_Clock::convert( tv->tv_sec, &sec_converter );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
121
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
122 // Convert the nanoseconds. This will round down to nearest whole tick.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
123 ticks += Cyg_Clock::convert( (cyg_tick_count)tv->tv_usec, &us_converter );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
124
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
125 return ticks;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
126 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
127
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
128 //==========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
129 // Select API function
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
130
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
131 __externC int
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
132 select(int nfd, fd_set *in, fd_set *out, fd_set *ex, struct timeval *tv)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
133 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
134 FILEIO_ENTRY();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
135
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
136 int error = ENOERR;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
137 int fd, mode, num;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
138 cyg_file *fp;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
139 fd_set in_res, out_res, ex_res; // Result sets
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
140 fd_set *selection[3], *result[3];
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
141 cyg_tick_count ticks;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
142 int mode_type[] = {CYG_FREAD, CYG_FWRITE, 0};
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
143 cyg_uint32 wake_count;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
144
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
145 FD_ZERO(&in_res);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
146 FD_ZERO(&out_res);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
147 FD_ZERO(&ex_res);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
148
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
149 // Set up sets
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
150 selection[0] = in; result[0] = &in_res;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
151 selection[1] = out; result[1] = &out_res;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
152 selection[2] = ex; result[2] = &ex_res;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
153
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
154 // Compute end time
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
155 if (tv)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
156 ticks = Cyg_Clock::real_time_clock->current_value() +
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
157 cyg_timeval_to_ticks( tv );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
158 else ticks = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
159
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
160 // Lock the mutex
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
161 select_mutex.lock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
162
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
163 // Scan sets for possible I/O until something found, timeout or error.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
164 while (!error)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
165 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
166 wake_count = selwake_count;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
167
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
168 num = 0; // Total file descriptors "ready"
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
169 for (mode = 0; !error && mode < 3; mode++)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
170 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
171 if (selection[mode]) {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
172 for (fd = 0; !error && fd < nfd; fd++)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
173 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
174 if (FD_ISSET(fd, selection[mode]))
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
175 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
176 fp = cyg_fp_get( fd );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
177 if( fp == NULL )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
178 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
179 error = EBADF;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
180 break;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
181 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
182
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
183 if ((*fp->f_ops->fo_select)(fp, mode_type[mode], 0))
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
184 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
185 FD_SET(fd, result[mode]);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
186 num++;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
187 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
188
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
189 cyg_fp_free( fp );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
190 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
191 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
192 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
193 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
194
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
195 if (num)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
196 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
197 // Found something, update user's sets
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
198 if (in) FD_COPY( &in_res, in );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
199 if (out) FD_COPY( &out_res, out );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
200 if (ex) FD_COPY( &ex_res, ex );
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
201 select_mutex.unlock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
202 FILEIO_RETURN_VALUE(num);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
203 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
204
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
205 Cyg_Scheduler::lock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
206
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
207 if( wake_count == selwake_count )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
208 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
209 // Nothing found, see if we want to wait
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
210 if (tv)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
211 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
212 if (ticks == 0)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
213 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
214 // Special case of "poll"
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
215 select_mutex.unlock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
216 Cyg_Scheduler::unlock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
217 FILEIO_RETURN_VALUE(0);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
218 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
219
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
220 if( !selwait.wait( ticks ) )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
221 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
222 // A non-standard wakeup, if the current time is equal to
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
223 // or past the timeout, return zero. Otherwise return
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
224 // EINTR, since we have been released.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
225 if( Cyg_Clock::real_time_clock->current_value() >= ticks )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
226 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
227 select_mutex.unlock();
119
77cec8369160 Merge from eCos master repository on 2000-09-01-07:47:03-BST
jlarmour
parents: 115
diff changeset
228 Cyg_Scheduler::unlock();
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
229 FILEIO_RETURN_VALUE(0);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
230 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
231 else error = EINTR;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
232 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
233 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
234 else
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
235 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
236 // Wait forever (until something happens)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
237
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
238 if( !selwait.wait() )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
239 error = EINTR;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
240 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
241 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
242
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
243 Cyg_Scheduler::unlock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
244
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
245 } // while(!error)
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
246
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
247 select_mutex.unlock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
248
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
249 FILEIO_RETURN(error);
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
250 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
251
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
252 //==========================================================================
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
253 // Select support functions.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
254
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
255 // -------------------------------------------------------------------------
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
256 // cyg_selinit() is used to initialize a selinfo structure
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
257
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
258 void cyg_selinit( struct CYG_SELINFO_TAG *sip )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
259 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
260 sip->si_info = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
261 sip->si_thread = 0;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
262 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
263
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
264 // -------------------------------------------------------------------------
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
265 // cyg_selrecord() is called when a client device needs to register
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
266 // the current thread for selection.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
267
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
268 void cyg_selrecord( CYG_ADDRWORD info, struct CYG_SELINFO_TAG *sip )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
269 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
270 sip->si_info = info;
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
271 sip->si_thread = (CYG_ADDRESS)Cyg_Thread::self();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
272 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
273
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
274 // -------------------------------------------------------------------------
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
275 // cyg_selwakeup() is called when the client device matches the select
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
276 // criterion, and needs to wake up a selector.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
277
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
278 void cyg_selwakeup( struct CYG_SELINFO_TAG *sip )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
279 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
280 // We don't actually use the si_info field of selinfo at present.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
281 // A potential use would be to select one of several selwait condition
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
282 // variables to signal. However, that would only be necessary if we
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
283 // end up having lots of threads in select.
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
284
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
285 Cyg_Scheduler::lock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
286
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
287 if( sip->si_thread != 0 )
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
288 {
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
289 // If the thread pointer is still present, this selection has
128
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 126
diff changeset
290 // not been fired before. We just wake up all threads waiting,
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 126
diff changeset
291 // regardless of whether they are waiting for this event or
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 126
diff changeset
292 // not. This avoids any race conditions, and is consistent
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 126
diff changeset
293 // with the behaviour of the BSD kernel.
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
294
128
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 126
diff changeset
295 sip->si_thread = 0;
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 126
diff changeset
296 selwait.broadcast();
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 126
diff changeset
297 selwake_count++;
0c2b7be0d798 Merge from eCos master repository on 2000-10-12-08:46:24-BST
jlarmour
parents: 126
diff changeset
298
115
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
299 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
300
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
301 Cyg_Scheduler::unlock();
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
302 }
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
303
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
304 // -------------------------------------------------------------------------
6ed91473a1cd Merge from eCos master repository on 2000-08-21-22:40:54-BST
jlarmour
parents:
diff changeset
305 // EOF select.cxx