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

Last change on this file was ac8025c, checked in by Sebastian Huber <sebastian.huber@…>, on Nov 8, 2018 at 12:09:54 PM

libcsupport: Add missing include

Update #3598.

  • 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#include <rtems/score/thread.h>
33#include <rtems/score/percpu.h>
34
35/* XXX check standards -- Linux version appears to be void */
36void _fwalk(struct _reent *, void *);
37
38
39static void sync_wrapper(FILE *f)
40{
41  int fn = fileno(f);
42
43  /*
44   * There is no way to report errors here.  So this is a best-effort approach.
45   */
46  (void) fsync(fn);
47  (void) fdatasync(fn);
48}
49
50/* iterate over all FILE *'s for this thread */
51static bool sync_per_thread(Thread_Control *t, void *arg)
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   return false;
70}
71
72/*
73 * _global_impure_ptr is not prototyped in any .h files.
74 * We have to extern it here.
75 */
76extern struct _reent * const _global_impure_ptr __ATTRIBUTE_IMPURE_PTR__;
77
78/**
79 * This function operates by as follows:
80 *    for all threads
81 *      for all FILE *
82 *         fsync()
83 *         fdatasync()
84 */
85void sync(void)
86{
87
88  /*
89   *  Walk the one used initially by RTEMS.
90   */
91  _fwalk(_global_impure_ptr, sync_wrapper);
92
93  /*
94   *  XXX Do we walk the one used globally by newlib?
95   *  XXX Do we need the RTEMS global one?
96   */
97
98  /*
99   *  Now walk all the per-thread reentrancy structures.
100   */
101  rtems_task_iterate(sync_per_thread, NULL);
102}
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