DEC 6.5 port

OK, to install this, we need a context diff(diff -c) and some
port-specific trigger to enable this code vs. the original code.  Can
anyone suggest a fix?  Why does the old lock code fail?


> Bruce Momjian
> >
> > > I tried to get 6.5 up on a DEC UNIX 4.0 machine with gcc (egcs 2.91.60
> > > actually).
> > >
> > >
> > > to get it to build at all I had to do two things:
> > >
> > > 1) change 'MAP_FILE' to 'USERMAP_FILE' in hba.h and hba.c, 'MAP_FILE'
> > > conflicts with a definition in /usr/include/sys/mman.h.  mman.h was
> > > included later and was clobbering the string with a constant
> >
> > I have changed MAP_FILE to USERMAP_FILE as you suggested.
> >
> >
> > >
> > > 2) I had to chop out the asm section in include/storage/s_lock.h
> >
> > What did you do, exactly?
> >
>
>
> 82,106c82,91
> < #define TAS(lock) tas(lock)
> < #define S_UNLOCK(lock) { __asm__("mb"); *(lock) = 0; }
> <
> < static __inline__ int
> < tas(volatile slock_t *lock)
> < {
> <     register slock_t _res;
> <
> < __asm__("    ldq   $0, %0              \n\
> <                  bne   $0, 3f          \n\
> <                  ldq_l $0, %0               \n\
> <                  bne   $0, 3f          \n\
> <                  or    $31, 1, $0          \n\
> <                  stq_c $0, %0               \n\
> <                  beq   $0, 2f              \n\
> <                  bis   $31, $31, %1        \n\
> <                  mb                           \n\
> <                  jmp   $31, 4f               \n\
> <               2: or    $31, 1, $0           \n\
> <               3: bis   $0, $0, %1           \n\
> <               4: nop      ": "=m"(*lock), "=r"(_res): :"0");
> <
> <     return (int) _res;
> < }
> <
> ---
> > /*
> >  * OSF/1 (Alpha AXP)
> >  *
> >  * Note that slock_t on the Alpha AXP is msemaphore instead of char
> >  * (see storage/ipc.h).
> >  */
> > #define TAS(lock)    (msem_lock((lock), MSEM_IF_NOWAIT) < 0)
> > #define S_UNLOCK(lock)    msem_unlock((lock), 0)
> > #define S_INIT_LOCK(lock)    msem_init((lock), MSEM_UNLOCKED)
> > #define S_LOCK_FREE(lock)    (!(lock)->msem_state)
> 107a93
> >
>
>
>
> > --
> >   Bruce Momjian                        |  http://www.op.net/~candle
> >   maillist@candle.pha.pa.us            |  (610) 853-3000
> >   +  If your life is a hard drive,     |  830 Blythe Avenue
> >   +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026
> >
>