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/*-------------------------------------------------------------------------
*
* s_lock.c--
* buffer manager interface routines
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/storage/buffer/Attic/s_lock.c,v 1.3 1998/02/26 04:35:28 momjian Exp $
*
*-------------------------------------------------------------------------
*/
/*
* S_LOCK() -- Implements the S_LOCK function for the Linux/Alpha platform.
* This function is usually an inlined macro for all other platforms,
* but must be a seperate function for the Linux/Alpha platform, due
* to the assembly code involved.
*/
#include <sys/types.h>
#include <sys/file.h>
#include <stdio.h>
#include <string.h>
#include <math.h>
#include <signal.h>
#include "postgres.h"
/* declarations split between these three files */
#include "storage/buf.h"
#include "storage/buf_internals.h"
#include "storage/bufmgr.h"
#include "storage/fd.h"
#include "storage/ipc.h"
#include "storage/s_lock.h"
#if defined(__alpha__) && defined(linux)
void
S_LOCK(slock_t *lock)
{
do
{
slock_t _res;
do
{
__asm__(" ldq $0, %0 \n\
bne $0, already_set \n\
ldq_l $0, %0 \n\
bne $0, already_set \n\
or $31, 1, $0 \n\
stq_c $0, %0 \n\
beq $0, stqc_fail \n\
success: bis $31, $31, %1 \n\
mb \n\
jmp $31, end \n\
stqc_fail: or $31, 1, $0 \n\
already_set: bis $0, $0, %1 \n\
end: nop ": "=m"(*lock), "=r"(_res): :"0");
} while (_res != 0);
} while (0);
}
#endif
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