mirror of
git://sourceware.org/git/newlib-cygwin.git
synced 2025-01-16 03:19:54 +08:00
656df313e0
changes of flags and fp lock. * libc/stdio/freopen.c: Ditto. * libc/stdio/freopen64.c: Ditto. * libc/stdio/fgetc.c: Revert change from 2009-04-24, remove sfp locks which guard entire function to avoid potential deadlocks when using stdio functions in multiple thraeds. * libc/stdio/fgets.c: Ditto. * libc/stdio/fgetwc.c: Ditto. * libc/stdio/fgetws.c: Ditto. * libc/stdio/fread.c: Ditto. * libc/stdio/fseek.c: Ditto. * libc/stdio/getc.c: Ditto. * libc/stdio/getdelim.c: Ditto. * libc/stdio/gets.c: Ditto. * libc/stdio/vfscanf.c: Ditto. * libc/stdio/vfwscanf.c: Ditto. * libc/stdio/fflush.c (_fflush_r): Split out core functionality into new function __sflush_r. Just lock file and call __sflush_r from here. * libc/stdio/fwalk.c (_fwalk): Remove static helper function and move functionality back into main function. Don't walk a file with flags value of 1. Add comment. (_fwalk_reent): Ditto. * libc/stdio/local.h (__sflush_r): Declare. * libc/stdio/refill.c (__srefill): Before calling fwalk, set flags value to 1 so this file pointer isn't walked. Revert flags afterwards and call __sflush_r for this fp if necessary. Add comments.
87 lines
2.7 KiB
C
87 lines
2.7 KiB
C
/*
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* Copyright (c) 1990 The Regents of the University of California.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms are permitted
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* provided that the above copyright notice and this paragraph are
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* duplicated in all such forms and that any documentation,
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* advertising materials, and other materials related to such
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* distribution and use acknowledge that the software was developed
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* by the University of California, Berkeley. The name of the
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* University may not be used to endorse or promote products derived
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* from this software without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*/
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/* No user fns here. Pesch 15apr92. */
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#if defined(LIBC_SCCS) && !defined(lint)
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static char sccsid[] = "%W% (Berkeley) %G%";
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#endif /* LIBC_SCCS and not lint */
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#include <_ansi.h>
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#include <reent.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.h>
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#include "local.h"
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int
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_DEFUN(_fwalk, (ptr, function),
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struct _reent *ptr _AND
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register int (*function) (FILE *))
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{
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register FILE *fp;
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register int n, ret = 0;
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register struct _glue *g;
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/*
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* It should be safe to walk the list without locking it;
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* new nodes are only added to the end and none are ever
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* removed.
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*
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* Avoid locking this list while walking it or else you will
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* introduce a potential deadlock in [at least] refill.c.
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*/
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for (g = &ptr->__sglue; g != NULL; g = g->_next)
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for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++)
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if (fp->_flags != 0)
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{
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if (fp->_flags != 0 && fp->_flags != 1 && fp->_file != -1)
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ret |= (*function) (fp);
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}
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return ret;
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}
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/* Special version of __fwalk where the function pointer is a reentrant
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I/O function (e.g. _fclose_r). */
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int
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_DEFUN(_fwalk_reent, (ptr, reent_function),
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struct _reent *ptr _AND
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register int (*reent_function) (struct _reent *, FILE *))
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{
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register FILE *fp;
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register int n, ret = 0;
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register struct _glue *g;
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/*
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* It should be safe to walk the list without locking it;
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* new nodes are only added to the end and none are ever
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* removed.
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*
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* Avoid locking this list while walking it or else you will
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* introduce a potential deadlock in [at least] refill.c.
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*/
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for (g = &ptr->__sglue; g != NULL; g = g->_next)
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for (fp = g->_iobs, n = g->_niobs; --n >= 0; fp++)
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if (fp->_flags != 0)
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{
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if (fp->_flags != 0 && fp->_flags != 1 && fp->_file != -1)
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ret |= (*reent_function) (ptr, fp);
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}
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return ret;
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}
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