diff options
Diffstat (limited to 'db2/db/db.c')
| -rw-r--r-- | db2/db/db.c | 24 |
1 files changed, 14 insertions, 10 deletions
diff --git a/db2/db/db.c b/db2/db/db.c index df3a9d2..8dad5fe 100644 --- a/db2/db/db.c +++ b/db2/db/db.c @@ -44,7 +44,7 @@ #include "config.h" #ifndef lint -static const char sccsid[] = "@(#)db.c 10.37 (Sleepycat) 8/23/97"; +static const char sccsid[] = "@(#)db.c 10.38 (Sleepycat) 9/2/97"; #endif /* not lint */ #ifndef NO_SYSTEM_INCLUDES @@ -248,9 +248,6 @@ db_open(fname, type, flags, mode, dbenv, dbinfo, dbpp) * that fail, we simply retry without the O_CREAT flag, which * will require that the meta-data page exist. */ -#undef OKFLAGS -#define OKFLAGS \ - DB_CREATE | DB_NOMMAP | DB_RDONLY | DB_THREAD | DB_TRUNCATE retry_cnt = 0; open_retry: if (LF_ISSET(DB_CREATE)) { if ((ret = __db_fdopen(real_name, flags | DB_EXCL, @@ -308,13 +305,20 @@ open_retry: if (LF_ISSET(DB_CREATE)) { } /* * The only way we can reach here with the DB_CREATE - * flag set is if we created the file. If we didn't - * create the file, there's a chance that someone else - * is busily doing so. Sleep and give them a chance, - * because we need the metadata page their going to - * write. + * flag set is if we created the file. If that's not + * the case, then a) someone else created the file + * but has not yet written out the meta-data page, or + * b) we truncated the file (DB_TRUNCATE) leaving it + * zero-length. In the case of a), we want to sleep + * and give the file creator some time to write the + * metadata page. In the case of b), charge forward. + * Note, there is a race in the case of two processes + * opening the file with the DB_TRUNCATE flag set at + * roughly the same time, and they could theoretically + * hurt each other, although it's pretty unlikely. */ - if (!LF_ISSET(DB_CREATE) && retry_cnt++ < 3) { + if (retry_cnt++ < 3 && + !LF_ISSET(DB_CREATE | DB_TRUNCATE)) { __db_sleep(1, 0); goto open_retry; } |