1997-09-18 16:21:02 +02:00
|
|
|
/*-------------------------------------------------------------------------
|
|
|
|
*
|
1999-02-14 00:22:53 +01:00
|
|
|
* s_lock.h
|
2001-09-29 06:02:27 +02:00
|
|
|
* Hardware-dependent implementation of spinlocks.
|
1997-09-18 16:21:02 +02:00
|
|
|
*
|
2001-09-29 06:02:27 +02:00
|
|
|
* NOTE: none of the macros in this file are intended to be called directly.
|
|
|
|
* Call them through the hardware-independent macros in spin.h.
|
1997-09-18 16:21:02 +02:00
|
|
|
*
|
2001-09-29 06:02:27 +02:00
|
|
|
* The following hardware-dependent macros must be provided for each
|
|
|
|
* supported platform:
|
2000-12-29 22:31:21 +01:00
|
|
|
*
|
|
|
|
* void S_INIT_LOCK(slock_t *lock)
|
|
|
|
* Initialize a spinlock (to the unlocked state).
|
|
|
|
*
|
|
|
|
* void S_LOCK(slock_t *lock)
|
|
|
|
* Acquire a spinlock, waiting if necessary.
|
|
|
|
* Time out and abort() if unable to acquire the lock in a
|
|
|
|
* "reasonable" amount of time --- typically ~ 1 minute.
|
1998-04-29 14:41:29 +02:00
|
|
|
*
|
2000-12-29 22:31:21 +01:00
|
|
|
* void S_UNLOCK(slock_t *lock)
|
|
|
|
* Unlock a previously acquired lock.
|
1998-04-29 14:41:29 +02:00
|
|
|
*
|
2000-12-29 22:31:21 +01:00
|
|
|
* bool S_LOCK_FREE(slock_t *lock)
|
|
|
|
* Tests if the lock is free. Returns TRUE if free, FALSE if locked.
|
|
|
|
* This does *not* change the state of the lock.
|
1998-04-29 14:41:29 +02:00
|
|
|
*
|
2001-09-29 06:02:27 +02:00
|
|
|
* Note to implementors: there are default implementations for all these
|
|
|
|
* macros at the bottom of the file. Check if your platform can use
|
|
|
|
* these or needs to override them.
|
|
|
|
*
|
|
|
|
* Usually, S_LOCK() is implemented in terms of an even lower-level macro
|
|
|
|
* TAS():
|
|
|
|
*
|
2000-12-29 22:31:21 +01:00
|
|
|
* int TAS(slock_t *lock)
|
|
|
|
* Atomic test-and-set instruction. Attempt to acquire the lock,
|
2001-01-19 03:58:59 +01:00
|
|
|
* but do *not* wait. Returns 0 if successful, nonzero if unable
|
2000-12-29 22:31:21 +01:00
|
|
|
* to acquire the lock.
|
1998-04-29 14:41:29 +02:00
|
|
|
*
|
2001-09-29 06:02:27 +02:00
|
|
|
* TAS() is NOT part of the API, and should never be called directly.
|
1997-09-18 16:21:02 +02:00
|
|
|
*
|
2001-09-29 06:02:27 +02:00
|
|
|
* CAUTION: on some platforms TAS() may sometimes report failure to acquire
|
|
|
|
* a lock even when the lock is not locked. For example, on Alpha TAS()
|
|
|
|
* will "fail" if interrupted. Therefore TAS() should always be invoked
|
|
|
|
* in a retry loop, even if you are certain the lock is free.
|
1998-04-29 14:41:29 +02:00
|
|
|
*
|
2001-12-11 03:58:49 +01:00
|
|
|
* ANOTHER CAUTION: be sure that TAS() and S_UNLOCK() represent sequence
|
|
|
|
* points, ie, loads and stores of other values must not be moved across
|
|
|
|
* a lock or unlock. In most cases it suffices to make the operation be
|
|
|
|
* done through a "volatile" pointer.
|
|
|
|
*
|
2000-12-29 22:31:21 +01:00
|
|
|
* On most supported platforms, TAS() uses a tas() function written
|
|
|
|
* in assembly language to execute a hardware atomic-test-and-set
|
|
|
|
* instruction. Equivalent OS-supplied mutex routines could be used too.
|
1998-06-16 09:18:16 +02:00
|
|
|
*
|
2000-12-29 22:31:21 +01:00
|
|
|
* If no system-specific TAS() is available (ie, HAS_TEST_AND_SET is not
|
2001-09-29 06:02:27 +02:00
|
|
|
* defined), then we fall back on an emulation that uses SysV semaphores
|
|
|
|
* (see spin.c). This emulation will be MUCH MUCH slower than a proper TAS()
|
2000-12-29 22:31:21 +01:00
|
|
|
* implementation, because of the cost of a kernel call per lock or unlock.
|
|
|
|
* An old report is that Postgres spends around 40% of its time in semop(2)
|
|
|
|
* when using the SysV semaphore code.
|
1997-09-18 16:21:02 +02:00
|
|
|
*
|
2001-09-29 06:02:27 +02:00
|
|
|
*
|
|
|
|
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
|
|
|
|
* Portions Copyright (c) 1994, Regents of the University of California
|
|
|
|
*
|
2001-12-11 03:58:49 +01:00
|
|
|
* $Id: s_lock.h,v 1.96 2001/12/11 02:58:49 tgl Exp $
|
2001-09-29 06:02:27 +02:00
|
|
|
*
|
|
|
|
*-------------------------------------------------------------------------
|
1997-09-18 16:21:02 +02:00
|
|
|
*/
|
2000-11-29 00:27:57 +01:00
|
|
|
#ifndef S_LOCK_H
|
1997-09-18 16:21:02 +02:00
|
|
|
#define S_LOCK_H
|
|
|
|
|
|
|
|
#include "storage/ipc.h"
|
|
|
|
|
1998-12-15 13:47:01 +01:00
|
|
|
|
1997-09-18 16:21:02 +02:00
|
|
|
#if defined(HAS_TEST_AND_SET)
|
|
|
|
|
1998-06-16 09:18:16 +02:00
|
|
|
|
|
|
|
#if defined(__GNUC__)
|
|
|
|
/*************************************************************************
|
|
|
|
* All the gcc inlines
|
1998-04-29 14:41:29 +02:00
|
|
|
*/
|
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
/*
|
2001-01-20 01:03:55 +01:00
|
|
|
* Standard gcc asm format:
|
2001-01-19 03:58:59 +01:00
|
|
|
*
|
2001-01-20 01:03:55 +01:00
|
|
|
__asm__ __volatile__(
|
|
|
|
" command \n"
|
|
|
|
" command \n"
|
|
|
|
" command \n"
|
|
|
|
: "=r"(_res) return value, in register
|
|
|
|
: "r"(lock) argument, 'lock pointer', in register
|
|
|
|
: "r0"); inline code uses this register
|
2001-01-19 03:58:59 +01:00
|
|
|
*/
|
|
|
|
|
1998-04-29 14:41:29 +02:00
|
|
|
|
2001-05-24 17:53:34 +02:00
|
|
|
#if defined(__i386__)
|
1998-06-16 09:18:16 +02:00
|
|
|
#define TAS(lock) tas(lock)
|
|
|
|
|
|
|
|
static __inline__ int
|
|
|
|
tas(volatile slock_t *lock)
|
|
|
|
{
|
1998-09-01 06:40:42 +02:00
|
|
|
register slock_t _res = 1;
|
1998-06-16 09:18:16 +02:00
|
|
|
|
2001-01-19 04:58:35 +01:00
|
|
|
__asm__ __volatile__(
|
2001-01-20 01:03:55 +01:00
|
|
|
" lock \n"
|
|
|
|
" xchgb %0,%1 \n"
|
|
|
|
: "=q"(_res), "=m"(*lock)
|
|
|
|
: "0"(_res));
|
1998-06-16 09:18:16 +02:00
|
|
|
return (int) _res;
|
|
|
|
}
|
1998-09-01 06:40:42 +02:00
|
|
|
|
1999-07-13 22:00:37 +02:00
|
|
|
#endif /* __i386__ */
|
1998-06-16 09:18:16 +02:00
|
|
|
|
|
|
|
|
2000-07-05 18:09:31 +02:00
|
|
|
#ifdef __ia64__
|
|
|
|
#define TAS(lock) tas(lock)
|
|
|
|
|
|
|
|
static __inline__ int
|
2001-01-19 03:58:59 +01:00
|
|
|
tas(volatile slock_t *lock)
|
2000-07-05 18:09:31 +02:00
|
|
|
{
|
2001-01-19 03:58:59 +01:00
|
|
|
long int ret;
|
2000-07-05 18:09:31 +02:00
|
|
|
|
2001-01-19 04:58:35 +01:00
|
|
|
__asm__ __volatile__(
|
2001-01-20 01:03:55 +01:00
|
|
|
" xchg4 %0=%1,%2 \n"
|
|
|
|
: "=r"(ret), "=m"(*lock)
|
|
|
|
: "r"(1), "1"(*lock)
|
|
|
|
: "memory");
|
2000-07-05 18:09:31 +02:00
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
return (int) ret;
|
2000-07-05 18:09:31 +02:00
|
|
|
}
|
2001-01-19 03:58:59 +01:00
|
|
|
|
|
|
|
#endif /* __ia64__ */
|
2000-07-05 18:09:31 +02:00
|
|
|
|
1998-06-16 09:18:16 +02:00
|
|
|
|
1999-11-18 22:47:41 +01:00
|
|
|
#if defined(__arm__) || defined(__arm__)
|
1999-04-13 19:42:26 +02:00
|
|
|
#define TAS(lock) tas(lock)
|
|
|
|
|
|
|
|
static __inline__ int
|
|
|
|
tas(volatile slock_t *lock)
|
|
|
|
{
|
2001-01-19 03:58:59 +01:00
|
|
|
register slock_t _res = 1;
|
1999-04-13 19:42:26 +02:00
|
|
|
|
2001-01-19 04:58:35 +01:00
|
|
|
__asm__ __volatile__(
|
2001-01-20 01:03:55 +01:00
|
|
|
" swpb %0, %0, [%3] \n"
|
|
|
|
: "=r"(_res), "=m"(*lock)
|
|
|
|
: "0"(_res), "r"(lock));
|
2001-01-19 03:58:59 +01:00
|
|
|
return (int) _res;
|
1999-04-13 19:42:26 +02:00
|
|
|
}
|
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
#endif /* __arm__ */
|
1999-04-13 19:42:26 +02:00
|
|
|
|
2001-09-24 22:10:44 +02:00
|
|
|
#if defined(__s390__) || defined(__s390x__)
|
2000-12-03 15:41:47 +01:00
|
|
|
/*
|
|
|
|
* S/390 Linux
|
|
|
|
*/
|
2001-01-19 03:58:59 +01:00
|
|
|
#define TAS(lock) tas(lock)
|
2000-12-03 15:41:47 +01:00
|
|
|
|
|
|
|
static inline int
|
|
|
|
tas(volatile slock_t *lock)
|
|
|
|
{
|
2001-01-19 03:58:59 +01:00
|
|
|
int _res;
|
|
|
|
|
2001-01-19 04:58:35 +01:00
|
|
|
__asm__ __volatile__(
|
2001-01-20 01:03:55 +01:00
|
|
|
" la 1,1 \n"
|
|
|
|
" l 2,%2 \n"
|
|
|
|
" slr 0,0 \n"
|
|
|
|
" cs 0,1,0(2) \n"
|
|
|
|
" lr %1,0 \n"
|
|
|
|
: "=m"(lock), "=d"(_res)
|
|
|
|
: "m"(lock)
|
|
|
|
: "0", "1", "2");
|
2001-01-19 03:58:59 +01:00
|
|
|
|
|
|
|
return (_res);
|
2000-12-03 15:41:47 +01:00
|
|
|
}
|
2001-01-19 03:58:59 +01:00
|
|
|
|
|
|
|
#endif /* __s390__ */
|
1999-04-13 19:42:26 +02:00
|
|
|
|
|
|
|
|
1999-07-13 22:00:37 +02:00
|
|
|
#if defined(__sparc__)
|
1998-06-16 09:18:16 +02:00
|
|
|
#define TAS(lock) tas(lock)
|
|
|
|
|
|
|
|
static __inline__ int
|
|
|
|
tas(volatile slock_t *lock)
|
|
|
|
{
|
1998-09-01 06:40:42 +02:00
|
|
|
register slock_t _res = 1;
|
1998-06-16 09:18:16 +02:00
|
|
|
|
2001-01-19 04:58:35 +01:00
|
|
|
__asm__ __volatile__(
|
2001-01-20 01:03:55 +01:00
|
|
|
" ldstub [%2], %0 \n"
|
|
|
|
: "=r"(_res), "=m"(*lock)
|
|
|
|
: "r"(lock));
|
1998-06-16 09:18:16 +02:00
|
|
|
return (int) _res;
|
|
|
|
}
|
1998-09-01 06:40:42 +02:00
|
|
|
|
1999-07-13 22:00:37 +02:00
|
|
|
#endif /* __sparc__ */
|
1998-06-16 09:18:16 +02:00
|
|
|
|
|
|
|
|
1999-06-13 02:07:43 +02:00
|
|
|
#if defined(__mc68000__) && defined(__linux__)
|
1999-06-11 00:59:22 +02:00
|
|
|
#define TAS(lock) tas(lock)
|
|
|
|
|
|
|
|
static __inline__ int
|
|
|
|
tas(volatile slock_t *lock)
|
|
|
|
{
|
|
|
|
register int rv;
|
2001-01-19 03:58:59 +01:00
|
|
|
|
2001-01-19 04:58:35 +01:00
|
|
|
__asm__ __volatile__(
|
2001-02-10 05:07:25 +01:00
|
|
|
" clrl %0 \n"
|
|
|
|
" tas %1 \n"
|
|
|
|
" sne %0 \n"
|
2001-01-20 01:03:55 +01:00
|
|
|
: "=d"(rv), "=m"(*lock)
|
|
|
|
: "1"(*lock)
|
|
|
|
: "cc");
|
2001-01-19 03:58:59 +01:00
|
|
|
|
1999-06-11 00:59:22 +02:00
|
|
|
return rv;
|
|
|
|
}
|
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
#endif /* defined(__mc68000__) && defined(__linux__) */
|
1999-06-11 00:59:22 +02:00
|
|
|
|
1998-06-16 09:18:16 +02:00
|
|
|
|
|
|
|
#if defined(NEED_VAX_TAS_ASM)
|
|
|
|
/*
|
|
|
|
* VAXen -- even multiprocessor ones
|
|
|
|
* (thanks to Tom Ivar Helbekkmo)
|
|
|
|
*/
|
|
|
|
#define TAS(lock) tas(lock)
|
|
|
|
|
|
|
|
static __inline__ int
|
|
|
|
tas(volatile slock_t *lock)
|
|
|
|
{
|
2001-04-14 01:32:57 +02:00
|
|
|
register int _res;
|
1998-06-16 09:18:16 +02:00
|
|
|
|
2001-01-19 04:58:35 +01:00
|
|
|
__asm__ __volatile__(
|
2001-01-20 01:03:55 +01:00
|
|
|
" movl $1, r0 \n"
|
|
|
|
" bbssi $0, (%1), 1f \n"
|
|
|
|
" clrl r0 \n"
|
|
|
|
"1: movl r0, %0 \n"
|
|
|
|
: "=r"(_res)
|
|
|
|
: "r"(lock)
|
|
|
|
: "r0");
|
2001-04-14 01:32:57 +02:00
|
|
|
return _res;
|
1998-06-16 09:18:16 +02:00
|
|
|
}
|
1998-09-01 06:40:42 +02:00
|
|
|
|
|
|
|
#endif /* NEED_VAX_TAS_ASM */
|
1998-06-16 09:18:16 +02:00
|
|
|
|
|
|
|
|
1998-10-02 17:23:08 +02:00
|
|
|
#if defined(NEED_NS32K_TAS_ASM)
|
|
|
|
#define TAS(lock) tas(lock)
|
|
|
|
|
|
|
|
static __inline__ int
|
|
|
|
tas(volatile slock_t *lock)
|
|
|
|
{
|
2001-04-14 01:32:57 +02:00
|
|
|
register int _res;
|
2001-01-19 03:58:59 +01:00
|
|
|
|
2001-01-19 04:58:35 +01:00
|
|
|
__asm__ __volatile__(
|
2001-01-20 01:03:55 +01:00
|
|
|
" sbitb 0, %0 \n"
|
|
|
|
" sfsd %1 \n"
|
|
|
|
: "=m"(*lock), "=r"(_res));
|
2001-04-14 01:32:57 +02:00
|
|
|
return _res;
|
1998-10-02 17:23:08 +02:00
|
|
|
}
|
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
#endif /* NEED_NS32K_TAS_ASM */
|
1998-10-02 17:23:08 +02:00
|
|
|
|
|
|
|
|
1998-06-16 09:18:16 +02:00
|
|
|
|
2000-12-29 22:31:21 +01:00
|
|
|
#else /* !__GNUC__ */
|
1998-04-29 14:41:29 +02:00
|
|
|
|
2000-12-29 22:31:21 +01:00
|
|
|
/***************************************************************************
|
|
|
|
* All non-gcc inlines
|
1999-12-16 02:25:23 +01:00
|
|
|
*/
|
|
|
|
|
2000-12-29 22:31:21 +01:00
|
|
|
#if defined(NEED_I386_TAS_ASM) && defined(USE_UNIVEL_CC)
|
1998-06-16 09:18:16 +02:00
|
|
|
#define TAS(lock) tas(lock)
|
1997-09-18 16:21:02 +02:00
|
|
|
|
1998-09-01 06:40:42 +02:00
|
|
|
asm int
|
2000-10-23 00:15:13 +02:00
|
|
|
tas(volatile slock_t *s_lock)
|
1998-06-16 09:18:16 +02:00
|
|
|
{
|
1998-09-11 18:56:24 +02:00
|
|
|
/* UNIVEL wants %mem in column 1, so we don't pg_indent this file */
|
2001-01-19 07:59:59 +01:00
|
|
|
%mem s_lock
|
1998-09-11 18:56:24 +02:00
|
|
|
pushl %ebx
|
1998-09-01 06:40:42 +02:00
|
|
|
movl s_lock, %ebx
|
|
|
|
movl $255, %eax
|
1998-06-16 09:18:16 +02:00
|
|
|
lock
|
1998-09-11 18:56:24 +02:00
|
|
|
xchgb %al, (%ebx)
|
|
|
|
popl %ebx
|
1998-06-16 09:18:16 +02:00
|
|
|
}
|
1998-07-19 06:17:13 +02:00
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
#endif /* defined(NEED_I386_TAS_ASM) && defined(USE_UNIVEL_CC) */
|
1997-09-18 16:21:02 +02:00
|
|
|
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* defined(__GNUC__) */
|
1998-07-18 16:58:58 +02:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
/*************************************************************************
|
2000-12-29 22:31:21 +01:00
|
|
|
* These are the platforms that do not use inline assembler (and hence
|
|
|
|
* have common code for gcc and non-gcc compilers, if both are available).
|
1998-07-18 16:58:58 +02:00
|
|
|
*/
|
1998-02-13 06:10:06 +01:00
|
|
|
|
1999-11-23 20:47:14 +01:00
|
|
|
|
|
|
|
#if defined(__alpha)
|
|
|
|
|
|
|
|
/*
|
2000-12-30 03:34:56 +01:00
|
|
|
* Correct multi-processor locking methods are explained in section 5.5.3
|
|
|
|
* of the Alpha AXP Architecture Handbook, which at this writing can be
|
|
|
|
* found at ftp://ftp.netbsd.org/pub/NetBSD/misc/dec-docs/index.html.
|
|
|
|
* For gcc we implement the handbook's code directly with inline assembler.
|
1999-11-23 20:47:14 +01:00
|
|
|
*/
|
2000-12-30 03:34:56 +01:00
|
|
|
#if defined(__GNUC__)
|
1999-11-23 20:47:14 +01:00
|
|
|
|
2000-12-30 03:34:56 +01:00
|
|
|
#define TAS(lock) tas(lock)
|
2001-01-19 04:58:35 +01:00
|
|
|
#define S_UNLOCK(lock) \
|
|
|
|
do \
|
|
|
|
{\
|
2001-01-20 01:03:55 +01:00
|
|
|
__asm__ __volatile__ (" mb \n"); \
|
2001-12-11 03:58:49 +01:00
|
|
|
*((volatile slock_t *) (lock)) = 0; \
|
2001-01-19 04:58:35 +01:00
|
|
|
} while (0)
|
1999-11-23 20:47:14 +01:00
|
|
|
|
|
|
|
static __inline__ int
|
|
|
|
tas(volatile slock_t *lock)
|
|
|
|
{
|
2000-12-30 03:34:56 +01:00
|
|
|
register slock_t _res;
|
|
|
|
|
2001-01-19 04:58:35 +01:00
|
|
|
__asm__ __volatile__(
|
2001-01-20 01:03:55 +01:00
|
|
|
" ldq $0, %0 \n"
|
|
|
|
" bne $0, 2f \n"
|
|
|
|
" ldq_l %1, %0 \n"
|
|
|
|
" bne %1, 2f \n"
|
|
|
|
" mov 1, $0 \n"
|
|
|
|
" stq_c $0, %0 \n"
|
|
|
|
" beq $0, 2f \n"
|
|
|
|
" mb \n"
|
|
|
|
" br 3f \n"
|
|
|
|
"2: mov 1, %1 \n"
|
|
|
|
"3: \n"
|
|
|
|
: "=m"(*lock), "=r"(_res)
|
2001-01-19 22:09:57 +01:00
|
|
|
:
|
2001-01-20 01:03:55 +01:00
|
|
|
: "0");
|
1999-11-23 20:47:14 +01:00
|
|
|
|
|
|
|
return (int) _res;
|
|
|
|
}
|
2000-12-30 03:34:56 +01:00
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
#else /* !defined(__GNUC__) */
|
2000-12-30 03:34:56 +01:00
|
|
|
|
|
|
|
/*
|
|
|
|
* The Tru64 compiler doesn't support gcc-style inline asm, but it does
|
|
|
|
* have some builtin functions that accomplish much the same results.
|
|
|
|
* For simplicity, slock_t is defined as long (ie, quadword) on Alpha
|
|
|
|
* regardless of the compiler in use. LOCK_LONG and UNLOCK_LONG only
|
|
|
|
* operate on an int (ie, longword), but that's OK as long as we define
|
|
|
|
* S_INIT_LOCK to zero out the whole quadword.
|
|
|
|
*/
|
|
|
|
|
|
|
|
#include <alpha/builtins.h>
|
|
|
|
|
|
|
|
#define S_INIT_LOCK(lock) (*(lock) = 0)
|
2001-01-19 03:58:59 +01:00
|
|
|
#define TAS(lock) (__LOCK_LONG_RETRY((lock), 1) == 0)
|
|
|
|
#define S_UNLOCK(lock) __UNLOCK_LONG(lock)
|
2000-12-30 03:34:56 +01:00
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
#endif /* defined(__GNUC__) */
|
1999-11-23 20:47:14 +01:00
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
#endif /* __alpha */
|
1999-11-23 20:47:14 +01:00
|
|
|
|
|
|
|
|
1998-07-18 16:51:10 +02:00
|
|
|
#if defined(__hpux)
|
|
|
|
/*
|
|
|
|
* HP-UX (PA-RISC)
|
|
|
|
*
|
|
|
|
* Note that slock_t on PA-RISC is a structure instead of char
|
1998-10-01 03:53:50 +02:00
|
|
|
* (see include/port/hpux.h).
|
1998-07-18 16:51:10 +02:00
|
|
|
*
|
|
|
|
* a "set" slock_t has a single word cleared. a "clear" slock_t has
|
2000-12-29 22:31:21 +01:00
|
|
|
* all words set to non-zero. tas() is in tas.s
|
1998-07-18 16:51:10 +02:00
|
|
|
*/
|
1998-02-13 06:10:06 +01:00
|
|
|
|
1998-10-01 03:53:50 +02:00
|
|
|
#define S_UNLOCK(lock) \
|
2001-01-19 08:03:53 +01:00
|
|
|
do { \
|
|
|
|
volatile slock_t *lock_ = (volatile slock_t *) (lock); \
|
2001-02-17 00:50:40 +01:00
|
|
|
lock_->sema[0] = -1; \
|
|
|
|
lock_->sema[1] = -1; \
|
|
|
|
lock_->sema[2] = -1; \
|
|
|
|
lock_->sema[3] = -1; \
|
2001-01-19 08:03:53 +01:00
|
|
|
} while (0)
|
1998-10-01 03:53:50 +02:00
|
|
|
|
1998-07-18 16:51:10 +02:00
|
|
|
#define S_LOCK_FREE(lock) ( *(int *) (((long) (lock) + 15) & ~15) != 0)
|
1998-10-01 03:53:50 +02:00
|
|
|
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* __hpux */
|
1998-02-13 06:10:06 +01:00
|
|
|
|
2001-05-24 17:53:34 +02:00
|
|
|
#if defined(__QNX__) && defined(__WATCOMC__)
|
2000-12-29 22:31:21 +01:00
|
|
|
/*
|
2001-05-24 17:53:34 +02:00
|
|
|
* QNX 4 using WATCOM C
|
2000-12-29 22:31:21 +01:00
|
|
|
*/
|
2001-05-24 17:53:34 +02:00
|
|
|
#define TAS(lock) wc_tas(lock)
|
|
|
|
extern slock_t wc_tas(volatile slock_t *lock);
|
|
|
|
#pragma aux wc_tas =\
|
|
|
|
" mov al,1 " \
|
|
|
|
" lock xchg al,[esi]" \
|
|
|
|
parm [esi] \
|
|
|
|
value [al];
|
|
|
|
|
|
|
|
#endif /* __QNX__ and __WATCOMC__*/
|
2000-12-29 22:31:21 +01:00
|
|
|
|
|
|
|
|
1998-07-18 16:58:58 +02:00
|
|
|
#if defined(__sgi)
|
|
|
|
/*
|
|
|
|
* SGI IRIX 5
|
1998-10-02 17:38:04 +02:00
|
|
|
* slock_t is defined as a unsigned long. We use the standard SGI
|
2001-01-19 03:58:59 +01:00
|
|
|
* mutex API.
|
1998-10-02 17:38:04 +02:00
|
|
|
*
|
|
|
|
* The following comment is left for historical reasons, but is probably
|
|
|
|
* not a good idea since the mutex ABI is supported.
|
1998-07-18 16:58:58 +02:00
|
|
|
*
|
|
|
|
* 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.
|
|
|
|
*/
|
1999-07-16 01:04:24 +02:00
|
|
|
#include "mutex.h"
|
1998-09-12 18:07:53 +02:00
|
|
|
#define TAS(lock) (test_and_set(lock,1))
|
|
|
|
#define S_UNLOCK(lock) (test_then_and(lock,0))
|
|
|
|
#define S_INIT_LOCK(lock) (test_then_and(lock,0))
|
|
|
|
#define S_LOCK_FREE(lock) (test_then_add(lock,0) == 0)
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* __sgi */
|
1998-07-18 16:58:58 +02:00
|
|
|
|
1998-09-21 04:25:29 +02:00
|
|
|
#if defined(sinix)
|
|
|
|
/*
|
2001-01-19 03:58:59 +01:00
|
|
|
* SINIX / Reliant UNIX
|
1998-09-21 04:25:29 +02:00
|
|
|
* slock_t is defined as a struct abilock_t, which has a single unsigned long
|
|
|
|
* member. (Basically same as SGI)
|
|
|
|
*
|
|
|
|
*/
|
|
|
|
#define TAS(lock) (!acquire_lock(lock))
|
|
|
|
#define S_UNLOCK(lock) release_lock(lock)
|
|
|
|
#define S_INIT_LOCK(lock) init_lock(lock)
|
|
|
|
#define S_LOCK_FREE(lock) (stat_lock(lock) == UNLOCKED)
|
|
|
|
#endif /* sinix */
|
2001-01-19 03:58:59 +01:00
|
|
|
|
1998-07-18 16:58:58 +02:00
|
|
|
|
|
|
|
#if defined(_AIX)
|
|
|
|
/*
|
|
|
|
* AIX (POWER)
|
|
|
|
*
|
|
|
|
* Note that slock_t on POWER/POWER2/PowerPC is int instead of char
|
|
|
|
* (see storage/ipc.h).
|
|
|
|
*/
|
|
|
|
#define TAS(lock) cs((int *) (lock), 0, 1)
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* _AIX */
|
1998-07-18 16:58:58 +02:00
|
|
|
|
|
|
|
|
|
|
|
#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)
|
|
|
|
/* For Mach, we have to delve inside the entrails of `struct mutex'. Ick! */
|
|
|
|
#define S_LOCK_FREE(alock) ((alock)->lock == 0)
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* nextstep */
|
1998-07-18 16:58:58 +02:00
|
|
|
|
|
|
|
|
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
#else /* !HAS_TEST_AND_SET */
|
2000-12-29 22:31:21 +01:00
|
|
|
|
|
|
|
/*
|
|
|
|
* Fake spinlock implementation using SysV semaphores --- slow and prone
|
|
|
|
* to fall foul of kernel limits on number of semaphores, so don't use this
|
2001-09-29 06:02:27 +02:00
|
|
|
* unless you must! The subroutines appear in spin.c.
|
2000-12-29 22:31:21 +01:00
|
|
|
*/
|
|
|
|
|
|
|
|
typedef struct
|
|
|
|
{
|
|
|
|
/* reference to semaphore used to implement this spinlock */
|
2001-01-19 03:58:59 +01:00
|
|
|
IpcSemaphoreId semId;
|
|
|
|
int sem;
|
2000-12-29 22:31:21 +01:00
|
|
|
} slock_t;
|
|
|
|
|
|
|
|
extern bool s_lock_free_sema(volatile slock_t *lock);
|
|
|
|
extern void s_unlock_sema(volatile slock_t *lock);
|
|
|
|
extern void s_init_lock_sema(volatile slock_t *lock);
|
2001-01-19 03:58:59 +01:00
|
|
|
extern int tas_sema(volatile slock_t *lock);
|
2000-12-29 22:31:21 +01:00
|
|
|
|
2001-01-19 03:58:59 +01:00
|
|
|
#define S_LOCK_FREE(lock) s_lock_free_sema(lock)
|
|
|
|
#define S_UNLOCK(lock) s_unlock_sema(lock)
|
|
|
|
#define S_INIT_LOCK(lock) s_init_lock_sema(lock)
|
|
|
|
#define TAS(lock) tas_sema(lock)
|
2000-12-29 22:31:21 +01:00
|
|
|
|
|
|
|
#endif /* HAS_TEST_AND_SET */
|
|
|
|
|
|
|
|
|
1998-07-18 16:58:58 +02:00
|
|
|
|
2001-09-29 06:02:27 +02:00
|
|
|
/*
|
1998-06-16 09:18:16 +02:00
|
|
|
* Default Definitions - override these above as needed.
|
|
|
|
*/
|
1997-09-18 16:21:02 +02:00
|
|
|
|
1998-06-16 09:18:16 +02:00
|
|
|
#if !defined(S_LOCK)
|
1998-06-15 20:40:05 +02:00
|
|
|
#define S_LOCK(lock) \
|
1998-10-01 03:53:50 +02:00
|
|
|
do { \
|
2000-12-29 22:31:21 +01:00
|
|
|
if (TAS(lock)) \
|
|
|
|
s_lock((lock), __FILE__, __LINE__); \
|
1998-10-01 03:53:50 +02:00
|
|
|
} while (0)
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* S_LOCK */
|
1997-09-18 16:21:02 +02:00
|
|
|
|
1998-05-04 18:58:59 +02:00
|
|
|
#if !defined(S_LOCK_FREE)
|
1998-06-16 09:18:16 +02:00
|
|
|
#define S_LOCK_FREE(lock) (*(lock) == 0)
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* S_LOCK_FREE */
|
1997-12-30 05:01:28 +01:00
|
|
|
|
1998-05-04 18:58:59 +02:00
|
|
|
#if !defined(S_UNLOCK)
|
2001-12-11 03:58:49 +01:00
|
|
|
#define S_UNLOCK(lock) (*((volatile slock_t *) (lock)) = 0)
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* S_UNLOCK */
|
1997-09-18 16:21:02 +02:00
|
|
|
|
1998-05-04 18:58:59 +02:00
|
|
|
#if !defined(S_INIT_LOCK)
|
1998-02-26 05:46:47 +01:00
|
|
|
#define S_INIT_LOCK(lock) S_UNLOCK(lock)
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* S_INIT_LOCK */
|
1997-09-18 16:21:02 +02:00
|
|
|
|
1998-05-04 18:58:59 +02:00
|
|
|
#if !defined(TAS)
|
2000-12-29 22:31:21 +01:00
|
|
|
extern int tas(volatile slock_t *lock); /* in port/.../tas.s, or
|
1998-09-01 06:40:42 +02:00
|
|
|
* s_lock.c */
|
1997-09-25 01:37:26 +02:00
|
|
|
|
2000-12-29 22:31:21 +01:00
|
|
|
#define TAS(lock) tas(lock)
|
1998-09-01 06:40:42 +02:00
|
|
|
#endif /* TAS */
|
1998-06-16 09:18:16 +02:00
|
|
|
|
2000-11-29 00:27:57 +01:00
|
|
|
|
2001-09-29 06:02:27 +02:00
|
|
|
/*
|
2001-03-25 19:52:46 +02:00
|
|
|
* Platform-independent out-of-line support routines
|
|
|
|
*/
|
2001-09-29 06:02:27 +02:00
|
|
|
extern void s_lock(volatile slock_t *lock, const char *file, int line);
|
2001-03-25 19:52:46 +02:00
|
|
|
|
2000-11-29 00:27:57 +01:00
|
|
|
#endif /* S_LOCK_H */
|