* Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Id: fd.c,v 1.12 1996/12/28 22:44:14 momjian Exp $
+ * $Id: fd.c,v 1.13 1997/01/13 01:25:29 scrappy Exp $
*
* NOTES:
*
#include "utils/palloc.h"
#include "storage/fd.h"
-#if defined(NEED_NOFILE_KLUDGE)
-/*
- * the SunOS 4 NOFILE is a lie, because the default limit is *not* the
- * maximum number of file descriptors you can have open.
- *
- * we have to either use this number (the default dtablesize) or
- * explicitly call setrlimit(RLIMIT_NOFILE, NOFILE).
- *
- * this braindamage apparently also affects solaris 2.X as well
- */
-#include <sys/user.h>
-#undef NOFILE
-#define NOFILE NOFILE_IN_U
-#endif /* NEED_NOFILE_KLUDGE */
-
/*
* Problem: Postgres does a system(ld...) to do dynamic loading. This
* will open several extra files in addition to those used by
* equivalent, the OS must still open several files to perform the
* dynamic loading. Keep this here.)
*/
+#ifndef RESERVE_FOR_LD
#define RESERVE_FOR_LD 10
+#endif
/*
- * If we are using weird storage managers, we may need to keep real
- * file descriptors open so that the jukebox server doesn't think we
- * have gone away (and no longer care about a platter or file that
- * we've been using). This might be an actual file descriptor for a
- * local jukebox interface that uses paths, or a socket connection for
- * a network jukebox server. Since we can't be opening and closing
- * these descriptors at whim, we must make allowances for them.
+ * We need to ensure that we have at least some file descriptors
+ * available to postgreSQL after we've reserved the ones for LD,
+ * so we set that value here.
+ *
+ * I think 10 is an apropriate value so that's what it'll be
+ * for now.
*/
-#ifdef HP_JUKEBOX
-#define RESERVE_FOR_JB 25
-#define MAXFILES ((NOFILE - RESERVE_FOR_LD) - RESERVE_FOR_JB)
-#else /* HP_JUKEBOX */
-#define MAXFILES (NOFILE - RESERVE_FOR_LD)
-#endif /* HP_JUKEBOX */
+#ifndef FD_MINFREE
+#define FD_MINFREE 10
+#endif
/* Debugging.... */
static int FileAccess(File file);
static File fileNameOpenFile(FileName fileName, int fileFlags, int fileMode);
static char *filepath(char *filename);
+static long pg_nofile(void);
int
pg_fsync(int fd)
}
#define fsync pg_fsync
+long
+pg_nofile(void)
+{
+ static long no_files = 0;
+
+ if (no_files == 0) {
+#if defined(MISSING_SYSCONF)
+ no_files = (long)NOFILE;
+#else
+ no_files = sysconf(_SC_OPEN_MAX);
+ if (no_files == -1) {
+ elog(DEBUG,"pg_nofile: Unable to get _SC_OPEN_MAX using sysconf() using (%d)", NOFILE);
+ no_files = (long)NOFILE;
+ }
+#endif /* MISSING_SYSCONF */
+ }
+
+ if ((no_files - RESERVE_FOR_LD) < FD_MINFREE)
+ elog(FATAL,"pg_nofile: insufficient File Descriptors in postmaster to start backend (%ld).\n"
+ " O/S allows %ld, Postmaster reserves %d, We need %d (MIN) after that.",
+ no_files - RESERVE_FOR_LD, no_files, RESERVE_FOR_LD, FD_MINFREE);
+ return no_files - RESERVE_FOR_LD;
+}
+
#if defined(FDDEBUG)
static void
_dump_lru()
DO_DB(printf("DEBUG: AssertLruRoom (FreeFd = %d)\n",
FreeFd));
- if (FreeFd <= 0 || nfile >= MAXFILES) {
+ if (FreeFd <= 0 || nfile >= pg_nofile()) {
/* We supposedly are using more vfds than we want to be. First
assert that there is at least one used vfd in the ring.
*/
file = AllocateVfd();
vfdP = &VfdCache[file];
- if (nfile >= MAXFILES || (FreeFd == 0 && osRanOut)) {
+ if (nfile >= pg_nofile() || (FreeFd == 0 && osRanOut)) {
AssertLruRoom();
}
}
close(fd);
++allocatedFiles;
- fdleft = MAXFILES - allocatedFiles;
+ fdleft = pg_nofile() - allocatedFiles;
if (fdleft < 6) {
elog(DEBUG,"warning: few usable file descriptors left (%d)", fdleft);
}
projects / postgresql / commitdiff