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Add asserts to check for file descriptor ring corruption.

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This commit is contained in:
Bryan Henderson 1996-12-27 22:57:51 +00:00
parent 4a5135c34e
commit 634b38aa86
1 changed files with 291 additions and 283 deletions
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14
src/backend/storage/file/fd.c
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@ -6,7 +6,7 @@
* Copyright (c) 1994, Regents of the University of California * Copyright (c) 1994, Regents of the University of California
* *
* IDENTIFICATION * IDENTIFICATION
* $Id: fd.c,v 1.10 1996/12/04 03:05:58 bryanh Exp $ * $Id: fd.c,v 1.11 1996/12/27 22:57:51 bryanh Exp $
* *
* NOTES: * NOTES:
* *
@ -169,7 +169,9 @@ static char Sep_char = '\\';
* AssertLruRoom - make sure that there is a free fd. * AssertLruRoom - make sure that there is a free fd.
* *
* the Last Recently Used ring is a doubly linked list that begins and * the Last Recently Used ring is a doubly linked list that begins and
* ends on element zero. * ends on element zero. Element zero is special -- it doesn't represent
* a file and its "fd" field always == VFD_CLOSED. Element zero is just an
* anchor that shows us the beginning/end of the ring.
* *
* example: * example:
* *
@ -373,6 +375,10 @@ AssertLruRoom()
FreeFd)); FreeFd));
if (FreeFd <= 0 || nfile >= MAXFILES) { if (FreeFd <= 0 || nfile >= MAXFILES) {
/* We supposedly are using more vfds than we want to be. First
assert that there is at least one used vfd in the ring.
*/
Assert(VfdCache[0].lruMoreRecently ! 0);
LruDelete(VfdCache[0].lruMoreRecently); LruDelete(VfdCache[0].lruMoreRecently);
} }
} }
@ -521,6 +527,7 @@ FileAccess(File file)
void void
FileInvalidate(File file) FileInvalidate(File file)
{ {
Assert(file > 0);
if (!FileIsNotOpen(file)) { if (!FileIsNotOpen(file)) {
LruDelete(file); LruDelete(file);
} }
@ -879,7 +886,8 @@ void
closeAllVfds() closeAllVfds()
{ {
int i; int i;
for (i=0; i<SizeVfdCache; i++) { Assert (FileIsNotOpen(0)); /* Make sure ring not corrupted */
for (i=1; i<SizeVfdCache; i++) {
if (!FileIsNotOpen(i)) if (!FileIsNotOpen(i))
LruDelete(i); LruDelete(i);
} }