Update.

[thirdparty/glibc.git] / db2 / mp / mp_fget.c

diff --git a/db2/mp/mp_fget.c b/db2/mp/mp_fget.c
index 1010751c928b8e384298be6c2c1cdb3607178bb4..f5955c4c6f6a9c71fabcf8b3bc3b183a4ad50375 100644 (file)
--- a/db2/mp/mp_fget.c
+++ b/db2/mp/mp_fget.c
@@ -7,7 +7,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)mp_fget.c    10.32 (Sleepycat) 11/26/97";
+static const char sccsid[] = "@(#)mp_fget.c    10.33 (Sleepycat) 12/2/97";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
@@ -272,8 +272,17 @@ found:             /* Increment the reference count. */
                 * discarded we know the buffer can't move and its contents
                 * can't change.
                 */
-               if (F_ISSET(bhp, BH_LOCKED)) {
+               for (cnt = 0; F_ISSET(bhp, BH_LOCKED); ++cnt) {
                        UNLOCKREGION(dbmp);
+
+                       /*
+                        * Sleep so that we don't simply spin, switching locks.
+                        * (See the comment in include/mp.h.)
+                        */
+                       if (cnt != 0 &&
+                           (__db_yield == NULL || __db_yield() != 0))
+                               __db_sleep(0, 1);
+
                        LOCKBUFFER(dbmp, bhp);
                        /* Waiting for I/O to finish... */
                        UNLOCKBUFFER(dbmp, bhp);