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spinlock code for ns32k (again)

From: Jon Buller <jonb(at)metronet(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Subject: spinlock code for ns32k (again)
Date: 1998-09-28 03:27:45
Message-ID: 199809280327.WAA27944@bullbox.heeia.hi.us (view raw or flat)
Thread:
Lists: pgsql-hackers
Here's the new diff for getting the NS32K assembly code into the
spin-locks.  Notice that it's now inline assembler in s_lock.h,
rather than seperate code in s_lock.c.  It also shrank a little
bit...  Just rip out the S_LOCK() define and insert the tas() inline
function.  Please let me know if there are any problems with it.

Jon Buller



Index: src/include/storage/s_lock.h
===================================================================
RCS file: /usr/local/cvsroot/pgsql/src/include/storage/s_lock.h,v
retrieving revision 1.50
diff -r1.50 s_lock.h
170a171,186
> #if defined(NEED_NS32K_TAS_ASM)
> #define TAS(lock) tas(lock)
> 
> static __inline__ int
> tas(volatile slock_t *lock)
> {
>   register _res;
>   __asm__("sbitb 0, %0
> 	sfsd %1"
> 	: "=m"(*lock), "=r"(_res));
>   return (int) _res; 
> }
> 
> #endif  /* NEED_NS32K_TAS_ASM */
> 
> 
214,231d229
< 
< 
< 
< #if defined(NEED_NS32K_TAS_ASM)
< 
< #define S_LOCK(lock)				\
< {						\
< 	slock_t res = 1;				\
< 	while (res) {				\
< 	  __asm__("movqd 0, r0");			\
< 	  __asm__("sbitd r0, %0" : "=m"(*lock));	\
< 	  __asm__("sprb us, %0" : "=r" (res));	\
< 	  res = ((res >> 5) & 1);			\
< 	}						\
< }
< 
< #endif	 /* NEED_NS32K_TAS_ASM */
< 

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Subject: LIBPQ for WIN32
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Subject: It sorta works, but I'm confused about locking

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