source: rtems/cpukit/libcsupport/src/sync.c @ df40cc9

4.11
Last change on this file since df40cc9 was c499856, checked in by Chris Johns <chrisj@…>, on Mar 20, 2014 at 9:10:47 PM

Change all references of rtems.com to rtems.org.

  • Property mode set to 100644
File size: 2.2 KB
Line 
1/**
2 *  @file
3 *
4 *  @brief Synchronize Data on Disk with Memory
5 *  @ingroup libcsupport
6 */
7
8/*
9 *  COPYRIGHT (c) 1989-2008.
10 *  On-Line Applications Research Corporation (OAR).
11 *
12 *  The license and distribution terms for this file may be
13 *  found in the file LICENSE in this distribution or at
14 *  http://www.rtems.org/license/LICENSE.
15 */
16
17#if HAVE_CONFIG_H
18#include "config.h"
19#endif
20
21/* Since we compile with strict ANSI we need to undef it to get
22 * prototypes for extensions
23 */
24#undef __STRICT_ANSI__
25int fdatasync(int);        /* still not always prototyped */
26
27
28#include <unistd.h>
29#include <stdio.h>
30
31#include <rtems.h>
32
33/* XXX check standards -- Linux version appears to be void */
34void _fwalk(struct _reent *, void *);
35
36
37static void sync_wrapper(FILE *f)
38{
39  int fn = fileno(f);
40
41  /*
42   *  We are explicitly NOT checking the return values as it does not
43   *  matter if they succeed.  We are just making a best faith attempt
44   *  at both and trusting that we were passed a good FILE pointer.
45   */
46  fsync(fn);
47  fdatasync(fn);
48}
49
50/* iterate over all FILE *'s for this thread */
51static void sync_per_thread(Thread_Control *t)
52{
53   struct _reent *current_reent;
54   struct _reent *this_reent;
55
56   /*
57    *  The sync_wrapper() function will operate on the current thread's
58    *  reent structure so we will temporarily use that.
59    */
60   this_reent = t->libc_reent;
61   if ( this_reent ) {
62     Thread_Control *executing = _Thread_Get_executing();
63     current_reent = executing->libc_reent;
64     executing->libc_reent = this_reent;
65     _fwalk (t->libc_reent, sync_wrapper);
66     executing->libc_reent = current_reent;
67   }
68}
69
70/*
71 * _global_impure_ptr is not prototyped in any .h files.
72 * We have to extern it here.
73 */
74extern struct _reent * const _global_impure_ptr __ATTRIBUTE_IMPURE_PTR__;
75
76/**
77 * This function operates by as follows:
78 *    for all threads
79 *      for all FILE *
80 *         fsync()
81 *         fdatasync()
82 */
83void sync(void)
84{
85
86  /*
87   *  Walk the one used initially by RTEMS.
88   */
89  _fwalk(_global_impure_ptr, sync_wrapper);
90
91  /*
92   *  XXX Do we walk the one used globally by newlib?
93   *  XXX Do we need the RTEMS global one?
94   */
95
96  /*
97   *  Now walk all the per-thread reentrancy structures.
98   */
99  rtems_iterate_over_all_threads(sync_per_thread);
100}
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