|
| 1 | +/*------------------------------------------------------------------------- |
| 2 | + * |
| 3 | + * s_lock.c-- |
| 4 | + * buffer manager interface routines |
| 5 | + * |
| 6 | + * Copyright (c) 1994, Regents of the University of California |
| 7 | + * |
| 8 | + * |
| 9 | + * IDENTIFICATION |
| 10 | + * $Header: /cvsroot/pgsql/src/backend/storage/buffer/Attic/s_lock.c,v 1.1 1997/12/30 04:03:01 scrappy Exp $ |
| 11 | + * |
| 12 | + *------------------------------------------------------------------------- |
| 13 | + */ |
| 14 | +/* |
| 15 | + * S_LOCK() -- Implements the S_LOCK function for the Linux/Alpha platform. |
| 16 | + * This function is usually an inlined macro for all other platforms, |
| 17 | + * but must be a seperate function for the Linux/Alpha platform, due |
| 18 | + * to the assembly code involved. |
| 19 | + */ |
| 20 | + |
| 21 | +#if defined(__alpha__)&& defined(linux) |
| 22 | + |
| 23 | +#include<sys/types.h> |
| 24 | +#include<sys/file.h> |
| 25 | +#include<stdio.h> |
| 26 | +#include<string.h> |
| 27 | +#include<math.h> |
| 28 | +#include<signal.h> |
| 29 | + |
| 30 | +#include"postgres.h" |
| 31 | + |
| 32 | +/* declarations split between these three files */ |
| 33 | +#include"storage/buf.h" |
| 34 | +#include"storage/buf_internals.h" |
| 35 | +#include"storage/bufmgr.h" |
| 36 | + |
| 37 | +#include"storage/fd.h" |
| 38 | +#include"storage/ipc.h" |
| 39 | +#include"storage/s_lock.h" |
| 40 | + |
| 41 | +voidS_LOCK(slock_t*lock) |
| 42 | +{ |
| 43 | +do |
| 44 | + { |
| 45 | +slock_t_res; |
| 46 | +do |
| 47 | + { |
| 48 | + __asm__(" ldq $0, %0 \n\ |
| 49 | + bne $0, already_set \n\ |
| 50 | + ldq_l $0, %0 \n\ |
| 51 | + bne $0, already_set \n\ |
| 52 | + or $31, 1, $0 \n\ |
| 53 | + stq_c $0, %0 \n\ |
| 54 | + beq $0, stqc_fail \n\ |
| 55 | + success: bis $31, $31, %1 \n\ |
| 56 | + mb \n\ |
| 57 | + jmp $31, end \n\ |
| 58 | + stqc_fail: or $31, 1, $0 \n\ |
| 59 | + already_set: bis $0, $0, %1 \n\ |
| 60 | + end: nop ":"=m"(*lock),"=r"(_res): :"0"); |
| 61 | + }while (_res!=0); |
| 62 | + }while (0); |
| 63 | +} |
| 64 | + |
| 65 | +#endif |