diff options
Diffstat (limited to 'mit-pthreads/stdio/refill.c')
| -rw-r--r-- | mit-pthreads/stdio/refill.c | 189 |
1 files changed, 0 insertions, 189 deletions
diff --git a/mit-pthreads/stdio/refill.c b/mit-pthreads/stdio/refill.c deleted file mode 100644 index 396895e56ff..00000000000 --- a/mit-pthreads/stdio/refill.c +++ /dev/null @@ -1,189 +0,0 @@ -/*- - * Copyright (c) 1990 The Regents of the University of California. - * Copyright (c) 1993, 1994 Chris Provenzano. - * All rights reserved. - * - * This code is derived from software contributed to Berkeley by - * Chris Torek. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#if defined(LIBC_SCCS) && !defined(lint) -/*static char *sccsid = "from: @(#)refill.c 5.3 (Berkeley) 2/24/91";*/ -static char *rcsid = "$Id$"; -#endif /* LIBC_SCCS and not lint */ - -#include <pthread.h> -#include <errno.h> -#include <stdio.h> -#include <stdlib.h> -#include "local.h" -#include "glue.h" - -extern pthread_mutex_t __sfp_mutex; -extern pthread_cond_t __sfp_cond; -extern struct glue __sglue; -extern int __sfp_state; - -/* This function is very similar to __swalk_sflush */ -static void __swalk_lflush() -{ - register FILE *fp, *savefp; - register int n, saven; - register struct glue *g, *saveg; - - /* Only allow other threads to read __sglue */ - pthread_mutex_lock(&__sfp_mutex); - __sfp_state++; - pthread_mutex_unlock(&__sfp_mutex); - - saven = 0; - saveg = NULL; - savefp = NULL; - for (g = &__sglue; g != NULL; g = g->next) { - for (fp = g->iobs, n = g->niobs; --n >= 0; fp++) { - if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) { - /* Is there anything to flush? */ - if (fp->_bf._base && (fp->_bf._base - fp->_p)) { - if (ftrylockfile(fp)) { /* Can we flush it */ - if (!saven) { /* No, save first fp we can't flush */ - saven = n; - saveg = g; - savefp = fp; - continue; - } - } else { - (void) __sflush(fp); - funlockfile(fp); - } - } - } - } - } - if (savefp) { - for (g = saveg; g != NULL; g = g->next) { - for (fp = savefp, n = saven + 1; --n >= 0; fp++) { - if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) { - /* Anything to flush */ - while (fp->_bf._base && (fp->_bf._base - fp->_p)) { - flockfile(fp); - (void) __sflush(fp); - funlockfile(fp); - } - } - } - } - } - - /* If no other readers wakeup a thread waiting to do __sfp */ - pthread_mutex_lock(&__sfp_mutex); - if (! (--__sfp_state)) { - pthread_cond_signal(&__sfp_cond); - } - pthread_mutex_unlock(&__sfp_mutex); -} - -/* - * Refill a stdio buffer. - * Return EOF on eof or error, 0 otherwise. - */ -__srefill(fp) - register FILE *fp; -{ - - /* make sure stdio is set up */ - __sinit (); - - fp->_r = 0; /* largely a convenience for callers */ - - /* SysV does not make this test; take it out for compatibility */ - if (fp->_flags & __SEOF) - return (EOF); - - /* if not already reading, have to be reading and writing */ - if ((fp->_flags & __SRD) == 0) { - if ((fp->_flags & __SRW) == 0) { - errno = EBADF; - return (EOF); - } - /* switch to reading */ - if (fp->_flags & __SWR) { - if (__sflush(fp)) - return (EOF); - fp->_flags &= ~__SWR; - fp->_w = 0; - fp->_lbfsize = 0; - } - fp->_flags |= __SRD; - } else { - /* - * We were reading. If there is an ungetc buffer, - * we must have been reading from that. Drop it, - * restoring the previous buffer (if any). If there - * is anything in that buffer, return. - */ - if (HASUB(fp)) { - FREEUB(fp); - if ((fp->_r = fp->_ur) != 0) { - fp->_p = fp->_up; - return (0); - } - } - } - - if (fp->_file == -1) { - fp->_flags |= __SEOF; - return(EOF); - } - - if (fp->_bf._base == NULL) - __smakebuf(fp); - - /* - * Before reading from a line buffered or unbuffered file, - * flush all line buffered output files, per the ANSI C - * standard. - */ - if (fp->_flags & (__SLBF|__SNBF)) - __swalk_lflush(); - fp->_p = fp->_bf._base; - fp->_r = __sread(fp, (char *)fp->_p, fp->_bf._size); - fp->_flags &= ~__SMOD; /* buffer contents are again pristine */ - if (fp->_r <= 0) { - if (fp->_r == 0) - fp->_flags |= __SEOF; - else { - fp->_r = 0; - fp->_flags |= __SERR; - } - return (EOF); - } - return (0); -} |