diff options
| author | Bruce Momjian <bruce@momjian.us> | 1999-04-30 02:04:51 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 1999-04-30 02:04:51 +0000 |
| commit | 52f1b2f3b6c8e6f8b04abb2beba264b23f9eeb83 (patch) | |
| tree | de1f66940d1d3da6ee96a8fe175b1c2eadf87ca9 /src/backend/storage/lmgr/proc.c | |
| parent | 7d62e9c719ec9eaf1d47a5149ae5e0a31d1029c8 (diff) | |
Prevent priority inversion in locking by checking for existing locks
before going into queue behind person with higher piority.
Diffstat (limited to 'src/backend/storage/lmgr/proc.c')
| -rw-r--r-- | src/backend/storage/lmgr/proc.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/src/backend/storage/lmgr/proc.c b/src/backend/storage/lmgr/proc.c index cc5233b0764..229a78587cb 100644 --- a/src/backend/storage/lmgr/proc.c +++ b/src/backend/storage/lmgr/proc.c @@ -7,7 +7,7 @@ * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.52 1999/03/28 20:32:26 vadim Exp $ + * $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.53 1999/04/30 02:04:51 momjian Exp $ * *------------------------------------------------------------------------- */ @@ -46,7 +46,7 @@ * This is so that we can support more backends. (system-wide semaphore * sets run out pretty fast.) -ay 4/95 * - * $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.52 1999/03/28 20:32:26 vadim Exp $ + * $Header: /cvsroot/pgsql/src/backend/storage/lmgr/proc.c,v 1.53 1999/04/30 02:04:51 momjian Exp $ */ #include <sys/time.h> #include <unistd.h> @@ -516,8 +516,7 @@ ProcSleep(PROC_QUEUE *waitQueue,/* lock->waitProcs */ * In a full queue, we would have a reader holding a lock, then a writer * gets the lock, then a bunch of readers, made up of readers who * could not share the first readlock because a writer was waiting, - * and new readers arriving while the writer had the lock. - * + * and new readers arriving while the writer had the lock. bjm */ proc = (PROC *) MAKE_PTR(waitQueue->links.prev); |