forked from Imagelibrary/rtems
48fed9a56e
Drop the <rtems/score/percpu.h> include since this file exposes a lot of implementation details.
100 lines
2.2 KiB
C
100 lines
2.2 KiB
C
/**
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* @file
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*
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* @brief Synchronize Data on Disk with Memory
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* @ingroup libcsupport
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*/
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/*
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* COPYRIGHT (c) 1989-2008.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.org/license/LICENSE.
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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/* Since we compile with strict ANSI we need to undef it to get
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* prototypes for extensions
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*/
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#undef __STRICT_ANSI__
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int fdatasync(int); /* still not always prototyped */
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#include <unistd.h>
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#include <stdio.h>
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#include <rtems.h>
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#include <rtems/score/percpu.h>
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/* XXX check standards -- Linux version appears to be void */
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void _fwalk(struct _reent *, void *);
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static void sync_wrapper(FILE *f)
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{
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int fn = fileno(f);
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/*
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* There is no way to report errors here. So this is a best-effort approach.
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*/
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(void) fsync(fn);
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(void) fdatasync(fn);
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}
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/* iterate over all FILE *'s for this thread */
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static void sync_per_thread(Thread_Control *t)
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{
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struct _reent *current_reent;
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struct _reent *this_reent;
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/*
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* The sync_wrapper() function will operate on the current thread's
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* reent structure so we will temporarily use that.
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*/
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this_reent = t->libc_reent;
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if ( this_reent ) {
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Thread_Control *executing = _Thread_Get_executing();
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current_reent = executing->libc_reent;
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executing->libc_reent = this_reent;
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_fwalk (t->libc_reent, sync_wrapper);
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executing->libc_reent = current_reent;
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}
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}
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/*
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* _global_impure_ptr is not prototyped in any .h files.
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* We have to extern it here.
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*/
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extern struct _reent * const _global_impure_ptr __ATTRIBUTE_IMPURE_PTR__;
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/**
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* This function operates by as follows:
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* for all threads
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* for all FILE *
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* fsync()
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* fdatasync()
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*/
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void sync(void)
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{
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/*
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* Walk the one used initially by RTEMS.
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*/
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_fwalk(_global_impure_ptr, sync_wrapper);
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/*
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* XXX Do we walk the one used globally by newlib?
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* XXX Do we need the RTEMS global one?
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*/
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/*
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* Now walk all the per-thread reentrancy structures.
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*/
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rtems_iterate_over_all_threads(sync_per_thread);
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}
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