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new alpha linux locking from Travis Melhiser <melhiser@viper.co.union.nc.us>

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This commit is contained in:
Bruce Momjian 1997-11-07 21:35:41 +00:00
parent 06a7001350
commit 6016148c61
1 changed files with 21 additions and 51 deletions
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56
src/include/storage/s_lock.h
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@ -7,7 +7,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.11 1997/10/30 05:24:19 momjian Exp $ * $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.12 1997/11/07 21:35:41 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -24,10 +24,6 @@
* ; * ;
* } * }
* *
* In addition to modifying this file you will need to modify
* the appropriate ...src/include/port/...h file to define
* HAS_TEST_AND_SET for the appropriate circumstances.
*
* If this is not done, POSTGRES will default to using System V * If this is not done, POSTGRES will default to using System V
* semaphores (and take a large performance hit -- around 40% of * semaphores (and take a large performance hit -- around 40% of
* its time on a DS5000/240 is spent in semop(3)...). * its time on a DS5000/240 is spent in semop(3)...).
@ -232,31 +228,6 @@ tas_dummy()
#endif /* sun3 */ #endif /* sun3 */
/*
* M68000 ports under NetBSD.
*
* This version should also work on a sun3, but I can't test it.
* Conversely the sun3 version should work under NetBSD/m68k, but
* it doesn't.
*/
#if defined(__NetBSD__) && defined(__m68k__)
static void S_LOCK(char *lock)
{
asm("
movel a6@(8),a0
LOOP:
tas a0@
bmi LOOP
");
}
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif /* M68000 && NetBSD */
/* /*
* sparc machines * sparc machines
*/ */
@ -342,29 +313,28 @@ tas_dummy()
#if defined(__alpha__) && defined(linux) #if defined(__alpha__) && defined(linux)
#define S_LOCK(lock) do \ #define S_LOCK(lock) do { \
{ \
slock_t _res; \ slock_t _res; \
do \ do { \
{ \
__asm__(" ldq $0, %0 \n\ __asm__(" ldq $0, %0 \n\
bne $0, already_set \n\ bne $0, already_set%= \n\
ldq_l $0, %0 \n\ ldq_l $0, %0 \n\
bne $0, already_set \n\ bne $0, already_set%= \n\
or $31, 1, $0 \n\ or $31, 1, $0 \n\
stq_c $0, %0 \n\ stq_c $0, %0 \n\
beq $0, stqc_fail \n\ beq $0, stqc_fail%= \n\
success: bis $31, $31, %1 \n\ success%=: \n\
bis $31, $31, %1 \n\
mb \n\ mb \n\
jmp $31, end \n\ jmp $31, end%= \n\
stqc_fail: or $31, 1, $0 \n\ stqc_fail%=: or $31, 1, $0 \n\
already_set: bis $0, $0, %1 \n\ already_set%=: bis $0, $0, %1 \n\
end: nop ": "=m"(*lock), "=r"(_res): :"0"); \ end%=: nop ": "=m"(*lock), "=r"(_res): :"0"); \
} while (_res != 0); \ } while (_res != 0); \
} while (0) } while (0)
#define S_UNLOCK(lock) (__asm__("mb"), *(lock) = 0) #define S_UNLOCK(lock) ({ __asm__("mb \n"); *(lock) = 0; })
#define S_INIT_LOCK(lock) S_UNLOCK(lock) #define S_INIT_LOCK(lock) S_UNLOCK(lock)