Skip to content
体验新版
项目
组织
正在加载...
登录
切换导航
打开侧边栏
Greenplum
Gpdb
提交
94e52d38
G
Gpdb
项目概览
Greenplum
/
Gpdb
通知
7
Star
1
Fork
0
代码
文件
提交
分支
Tags
贡献者
分支图
Diff
Issue
0
列表
看板
标记
里程碑
合并请求
0
DevOps
流水线
流水线任务
计划
Wiki
0
Wiki
分析
仓库
DevOps
项目成员
Pages
G
Gpdb
项目概览
项目概览
详情
发布
仓库
仓库
文件
提交
分支
标签
贡献者
分支图
比较
Issue
0
Issue
0
列表
看板
标记
里程碑
合并请求
0
合并请求
0
Pages
DevOps
DevOps
流水线
流水线任务
计划
分析
分析
仓库分析
DevOps
Wiki
0
Wiki
成员
成员
收起侧边栏
关闭侧边栏
动态
分支图
创建新Issue
流水线任务
提交
Issue看板
体验新版 GitCode,发现更多精彩内容 >>
提交
94e52d38
编写于
9月 22, 1997
作者:
V
Vadim B. Mikheev
浏览文件
操作
浏览文件
下载
电子邮件补丁
差异文件
Two copies...
上级
90d49005
变更
1
隐藏空白更改
内联
并排
Showing
1 changed file
with
1 addition
and
405 deletion
+1
-405
src/include/storage/s_lock.h
src/include/storage/s_lock.h
+1
-405
未找到文件。
src/include/storage/s_lock.h
浏览文件 @
94e52d38
...
...
@@ -7,411 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.1 1997/09/18 14:20:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
/*
* DESCRIPTION
* The following code fragment should be written (in assembly
* language) on machines that have a native test-and-set instruction:
*
* void
* S_LOCK(char_address)
* char *char_address;
* {
* while (test_and_set(char_address))
* ;
* }
*
* If this is not done, POSTGRES will default to using System V
* semaphores (and take a large performance hit -- around 40% of
* its time on a DS5000/240 is spent in semop(3)...).
*
* NOTES
* AIX has a test-and-set but the recommended interface is the cs(3)
* system call. This provides an 8-instruction (plus system call
* overhead) uninterruptible compare-and-set operation. True
* spinlocks might be faster but using cs(3) still speeds up the
* regression test suite by about 25%. I don't have an assembler
* manual for POWER in any case.
*
*/
#ifndef S_LOCK_H
#define S_LOCK_H
#include "storage/ipc.h"
#if defined(HAS_TEST_AND_SET)
#if defined (nextstep)
/*
* NEXTSTEP (mach)
* slock_t is defined as a struct mutex.
*/
#define S_LOCK(lock) mutex_lock(lock)
#define S_UNLOCK(lock) mutex_unlock(lock)
#define S_INIT_LOCK(lock) mutex_init(lock)
/* S_LOCK_FREE should return 1 if lock is free; 0 if lock is locked */
/* For Mach, we have to delve inside the entrails of `struct mutex'. Ick! */
#define S_LOCK_FREE(alock) ((alock)->lock == 0)
#endif
/* next */
#if defined(irix5)
/*
* SGI IRIX 5
* slock_t is defined as a struct abilock_t, which has a single unsigned long
* member.
*
* This stuff may be supplemented in the future with Masato Kataoka's MIPS-II
* assembly from his NECEWS SVR4 port, but we probably ought to retain this
* for the R3000 chips out there.
*/
#define S_LOCK(lock) do \
{ \
while (!acquire_lock(lock)) \
; \
} while (0)
#define S_UNLOCK(lock) release_lock(lock)
#define S_INIT_LOCK(lock) init_lock(lock)
/* S_LOCK_FREE should return 1 if lock is free; 0 if lock is locked */
#define S_LOCK_FREE(lock) (stat_lock(lock) == UNLOCKED)
#endif
/* irix5 */
/*
* OSF/1 (Alpha AXP)
*
* Note that slock_t on the Alpha AXP is msemaphore instead of char
* (see storage/ipc.h).
*/
#if defined(__alpha__) || defined(__alpha)
#define S_LOCK(lock) do \
{ \
while (msem_lock((lock), MSEM_IF_NOWAIT) < 0) \
; \
} while (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)
#endif
/* alpha */
/*
* Solaris 2
*/
#if defined(i386_solaris) || \
defined(sparc_solaris)
/* for xxxxx_solaris, this is defined in port/.../tas.s */
static
int
tas
(
slock_t
*
lock
);
#define S_LOCK(lock) do \
{ \
while (tas(lock)) \
; \
} while (0)
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif
/* i86pc_solaris || sparc_solaris */
/*
* AIX (POWER)
*
* Note that slock_t on POWER/POWER2/PowerPC is int instead of char
* (see storage/ipc.h).
*/
#if defined(aix)
#define S_LOCK(lock) do \
{ \
while (cs((int *) (lock), 0, 1)) \
;
\
}
while
(
0
)
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif
/* aix */
/*
* HP-UX (PA-RISC)
*
* Note that slock_t on PA-RISC is a structure instead of char
* (see storage/ipc.h).
*/
#if defined(hpux)
/*
* a "set" slock_t has a single word cleared. a "clear" slock_t has
* all words set to non-zero.
*/
static
slock_t
clear_lock
=
{
-
1
,
-
1
,
-
1
,
-
1
};
static
int
tas
(
slock_t
*
lock
);
#define S_LOCK(lock) do \
{ \
while (tas(lock)) \
; \
} while (0)
#define S_UNLOCK(lock) (*(lock) = clear_lock)
/* struct assignment */
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#define S_LOCK_FREE(lock) ( *(int *) (((long) (lock) + 15) & ~15) != 0)
#endif
/* hpux */
/*
* sun3
*/
#if defined(sun3)
static
int
tas
(
slock_t
*
lock
);
#define S_LOCK(lock) do \
{ \
while (tas(lock)) \
; \
} while (0)
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#ifdef NOT_USED
static
int
tas_dummy
()
{
asm
(
"LLA0:"
);
asm
(
" .data"
);
asm
(
" .text"
);
asm
(
"|#PROC# 04"
);
asm
(
" .globl _tas"
);
asm
(
"_tas:"
);
asm
(
"|#PROLOGUE# 1"
);
asm
(
" movel sp@(0x4),a0"
);
asm
(
" tas a0@"
);
asm
(
" beq LLA1"
);
asm
(
" moveq #-128,d0"
);
asm
(
" rts"
);
asm
(
"LLA1:"
);
asm
(
" moveq #0,d0"
);
asm
(
" rts"
);
asm
(
" .data"
);
}
#endif
#endif
/* sun3 */
/*
* sparc machines
*/
#if defined(NEED_SPARC_TAS_ASM)
/* if we're using -ansi w/ gcc, use __asm__ instead of asm */
#if defined(__STRICT_ANSI__)
#define asm(x) __asm__(x)
#endif
static
int
tas
(
slock_t
*
lock
);
#ifdef NOT_USED
static
int
tas_dummy
()
{
asm
(
".seg
\"
data
\"
"
);
asm
(
".seg
\"
text
\"
"
);
asm
(
".global _tas"
);
asm
(
"_tas:"
);
/*
* Sparc atomic test and set (sparc calls it "atomic load-store")
*/
asm
(
"ldstub [%r8], %r8"
);
/*
* Did test and set actually do the set?
*/
asm
(
"tst %r8"
);
asm
(
"be,a ReturnZero"
);
/*
* otherwise, just return.
*/
asm
(
"clr %r8"
);
asm
(
"mov 0x1, %r8"
);
asm
(
"ReturnZero:"
);
asm
(
"retl"
);
asm
(
"nop"
);
}
#endif
#define S_LOCK(addr) do \
{ \
while (tas(addr)) \
; \
} while (0)
/*
* addr should be as in the above S_LOCK routine
*/
#define S_UNLOCK(addr) (*(addr) = 0)
#define S_INIT_LOCK(addr) (*(addr) = 0)
#endif
/* NEED_SPARC_TAS_ASM */
/*
* i386 based things
*/
#if defined(NEED_I386_TAS_ASM)
#define S_LOCK(lock) do \
{ \
slock_t res; \
do \
{ \
__asm__("xchgb %0,%1": "=q"(res), "=m"(*lock):"0"(0x1)); \
} while (res != 0); \
} while (0)
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif
/* NEED_I386_TAS_ASM */
#if defined(__alpha__) && defined(linux)
#define S_LOCK(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)
#define S_UNLOCK(lock) (__asm__("mb"), *(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif
/* defined(__alpha__) && defined(linux) */
#if defined(linux) && defined(sparc)
#define S_LOCK(lock) do \
{ \
slock_t res; \
do \
{ \
__asm__("ldstub [%1], %0" \
: "=&r"(res) \
: "r"(lock)); \
} while (!res != 0); \
} while (0)
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif
/* defined(linux) && defined(sparc) */
#if defined(linux) && defined(PPC)
#ifdef NOT_USED
static
int
tas_dummy
()
{
__asm__
(
"
\n
\
tas:
\n
\
lwarx 5,0,3
\n
\
cmpwi 5,0
\n
\
bne fail
\n
\
addi 5,5,1
\n
\
stwcx. 5,0,3
\n
\
beq success
\n
\
fail: li 3,1
\n
\
blr
\n
\
success:
\n
\
li 3,0
\n
\
blr
\n
\
"
);
}
#endif
#define S_LOCK(lock) do \
{
\
while
(
tas
(
lock
))
\
;
\
}
while
(
0
)
#define S_UNLOCK(lock) (*(lock) = 0)
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
#endif
/* defined(linux) && defined(PPC) */
#endif
/* HAS_TEST_AND_SET */
#endif
/* S_LOCK_H */
/*-------------------------------------------------------------------------
*
* s_lock.h--
* This file contains the implementation (if any) for spinlocks.
*
* Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.1 1997/09/18 14:20:59 momjian Exp $
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.2 1997/09/22 04:21:51 vadim Exp $
*
*-------------------------------------------------------------------------
*/
...
...
编辑
预览
Markdown
is supported
0%
请重试
或
添加新附件
.
添加附件
取消
You are about to add
0
people
to the discussion. Proceed with caution.
先完成此消息的编辑!
取消
想要评论请
注册
或
登录