[parisc-linux] db3 patch for Linux/HPPA

[Jochen Friedrich]

Hi Matthew,

this fixes a problem with db3 mutexes. Problem is in 
__db_tas_mutex_init(). If MUTEX_INIT returns non-zero value, mutexp->spins 
doesn't get initialized and later __db_tas_mutex_lock loops without ever 
trying to aquire the lock (as spins is zero).

diff -urN db-3.2.9/include/mutex.h db-3.2.9.new/include/mutex.h
--- db-3.2.9/include/mutex.h    Sun Jun 23 16:34:28 2002
+++ db-3.2.9.new/include/mutex.h        Sun Jun 23 16:33:38 2002
@@ -413,7 +413,7 @@
        __r & 1;                                                        \
 })

-#define        MUTEX_UNSET(tsl)        (*(tsl) = -1)
+#define        MUTEX_UNSET(tsl)        (!(*(tsl) = -1))
 #define        MUTEX_INIT(tsl)         MUTEX_UNSET(tsl)
 #endif
 #endif

Cheers,
--jochen