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Commit d7810023 authored by Bruce Momjian's avatar Bruce Momjian
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New ASM format: 

/*
 * Standard __asm__ format:
 *
 *  __asm__(
 *          "command;"
 *          "command;"
 *          "command;"
 *      :   "=r"(_res)          return value, in register
 *      :   "r"(lock)           argument, 'lock pointer', in register
 *      :   "r0");              inline code uses this register
 */
parent 27e61898
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src/include/storage/s_lock.h
+ 122
− 93
View file @ d7810023
......@@ -9,7 +9,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.78 2001/01/18 23:40:26 momjian Exp $
* $Header: /cvsroot/pgsql/src/include/storage/s_lock.h,v 1.79 2001/01/19 02:58:59 momjian Exp $
*
*-------------------------------------------------------------------------
*/
......@@ -35,7 +35,7 @@
*
* int TAS(slock_t *lock)
* Atomic test-and-set instruction. Attempt to acquire the lock,
* but do *not* wait. Returns 0 if successful, nonzero if unable
* but do *not* wait. Returns 0 if successful, nonzero if unable
* to acquire the lock.
*
* TAS() is a lower-level part of the API, but is used directly in a
......@@ -48,9 +48,7 @@
* unsigned spins = 0;
*
* while (TAS(lock))
* {
* S_LOCK_SLEEP(lock, spins++);
* }
* }
*
* where S_LOCK_SLEEP() checks for timeout and sleeps for a short
......@@ -87,10 +85,10 @@
/* Platform-independent out-of-line support routines */
extern void s_lock(volatile slock_t *lock,
const char *file, const int line);
const char *file, const int line);
extern void s_lock_sleep(unsigned spins, int microsec,
volatile slock_t *lock,
const char *file, const int line);
volatile slock_t *lock,
const char *file, const int line);
#if defined(HAS_TEST_AND_SET)
......@@ -101,6 +99,18 @@ extern void s_lock_sleep(unsigned spins, int microsec,
* All the gcc inlines
*/
/*
* Standard __asm__ format:
*
* __asm__(
* "command;"
* "command;"
* "command;"
* : "=r"(_res) return value, in register
* : "r"(lock) argument, 'lock pointer', in register
* : "r0"); inline code uses this register
*/
#if defined(__i386__)
#define TAS(lock) tas(lock)
......@@ -110,7 +120,11 @@ tas(volatile slock_t *lock)
{
register slock_t _res = 1;
__asm__("lock; xchgb %0,%1": "=q"(_res), "=m"(*lock):"0"(_res));
__asm__(
"lock;"
"xchgb %0,%1;"
: "=q"(_res), "=m"(*lock)
: "0"(_res));
return (int) _res;
}
......@@ -121,19 +135,20 @@ __asm__("lock; xchgb %0,%1": "=q"(_res), "=m"(*lock):"0"(_res));
#define TAS(lock) tas(lock)
static __inline__ int
tas (volatile slock_t *lock)
tas(volatile slock_t *lock)
{
long int ret;
long int ret;
__asm__ __volatile__(
"xchg4 %0=%1,%2"
: "=r"(ret), "=m"(*lock)
: "r"(1), "1"(*lock)
: "memory");
__asm__ __volatile__(
"xchg4 %0=%1,%2;"
: "=r"(ret), "=m"(*lock)
: "r"(1), "1"(*lock)
: "memory");
return (int) ret;
return (int) ret;
}
#endif /* __ia64__ */
#endif /* __ia64__ */
#if defined(__arm__) || defined(__arm__)
......@@ -142,37 +157,42 @@ tas (volatile slock_t *lock)
static __inline__ int
tas(volatile slock_t *lock)
{
register slock_t _res = 1;
register slock_t _res = 1;
__asm__("swpb %0, %0, [%3]": "=r"(_res), "=m"(*lock):"0"(_res), "r" (lock));
return (int) _res;
__asm__(
"swpb %0, %0, [%3];"
: "=r"(_res), "=m"(*lock)
: "0"(_res), "r"(lock));
return (int) _res;
}
#endif /* __arm__ */
#endif /* __arm__ */
#if defined(__s390__)
/*
* S/390 Linux
*/
#define TAS(lock) tas(lock)
#define TAS(lock) tas(lock)
static inline int
tas(volatile slock_t *lock)
{
int _res;
__asm__ __volatile(" la 1,1\n"
" l 2,%2\n"
" slr 0,0\n"
" cs 0,1,0(2)\n"
" lr %1,0"
: "=m" (lock), "=d" (_res)
: "m" (lock)
: "0", "1", "2");
return (_res);
int _res;
__asm__ __volatile(
"la 1,1;"
"l 2,%2;"
"slr 0,0;"
"cs 0,1,0(2);"
"lr %1,0;"
: "=m"(lock), "=d"(_res)
: "m"(lock)
: "0", "1", "2");
return (_res);
}
#endif /* __s390__ */
#endif /* __s390__ */
#if defined(__sparc__)
......@@ -183,8 +203,9 @@ tas(volatile slock_t *lock)
{
register slock_t _res = 1;
__asm__("ldstub [%2], %0" \
: "=r"(_res), "=m"(*lock) \
__asm__(
"ldstub [%2], %0;"
: "=r"(_res), "=m"(*lock)
: "r"(lock));
return (int) _res;
}
......@@ -199,16 +220,18 @@ static __inline__ int
tas(volatile slock_t *lock)
{
register int rv;
__asm__ __volatile__ (
"tas %1; sne %0"
: "=d" (rv), "=m"(*lock)
: "1" (*lock)
: "cc" );
__asm__ __volatile__(
"tas %1;"
"sne %0;"
: "=d"(rv), "=m"(*lock)
: "1"(*lock)
: "cc");
return rv;
}
#endif /* defined(__mc68000__) && defined(__linux__) */
#endif /* defined(__mc68000__) && defined(__linux__) */
#if defined(NEED_VAX_TAS_ASM)
......@@ -225,13 +248,14 @@ tas(volatile slock_t *lock)
{
register _res;
__asm__(" movl $1, r0 \
bbssi $0, (%1), 1f \
clrl r0 \
1: movl r0, %0 "
: "=r"(_res) /* return value, in register */
: "r"(lock) /* argument, 'lock pointer', in register */
: "r0"); /* inline code uses this register */
__asm__(
"movl $1, r0;"
"bbssi $0, (%1), 1f;"
"clrl r0;"
"1: movl r0, %0;"
: "=r"(_res)
: "r"(lock)
: "r0");
return (int) _res;
}
......@@ -244,14 +268,16 @@ tas(volatile slock_t *lock)
static __inline__ int
tas(volatile slock_t *lock)
{
register _res;
__asm__("sbitb 0, %0 \n\
sfsd %1"
: "=m"(*lock), "=r"(_res));
return (int) _res;
register _res;
__asm__(
"sbitb 0, %0;"
"sfsd %1;"
: "=m"(*lock), "=r"(_res));
return (int) _res;
}
#endif /* NEED_NS32K_TAS_ASM */
#endif /* NEED_NS32K_TAS_ASM */
......@@ -268,7 +294,7 @@ asm int
tas(volatile slock_t *s_lock)
{
/* UNIVEL wants %mem in column 1, so we don't pg_indent this file */
%mem s_lock
%mem s_lock
pushl %ebx
movl s_lock, %ebx
movl $255, %eax
......@@ -277,7 +303,7 @@ tas(volatile slock_t *s_lock)
popl %ebx
}
#endif /* defined(NEED_I386_TAS_ASM) && defined(USE_UNIVEL_CC) */
#endif /* defined(NEED_I386_TAS_ASM) && defined(USE_UNIVEL_CC) */
#endif /* defined(__GNUC__) */
......@@ -300,30 +326,33 @@ tas(volatile slock_t *s_lock)
#if defined(__GNUC__)
#define TAS(lock) tas(lock)
#define S_UNLOCK(lock) do { __asm__ volatile ("mb"); *(lock) = 0; } while (0)
#define S_UNLOCK(lock) do { __asm__ volatile ("mb"); *(lock) = 0; } while (0)
static __inline__ int
tas(volatile slock_t *lock)
{
register slock_t _res;
__asm__ volatile
(" 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) : : "0");
__asm__ volatile(
"ldq $0, %0;"
"bne $0, 2f;"
"ldq_l %1, %0;"
"bne %1, 2f;"
"mov 1, $0;"
"stq_c $0, %0;"
"beq $0, 2f;"
"mb;"
"br 3f;"
"2: mov 1, %1;"
"3:"
: "=m"(*lock), "=r"(_res)
:
: "0");
return (int) _res;
}
#else /* !defined(__GNUC__) */
#else /* !defined(__GNUC__) */
/*
* The Tru64 compiler doesn't support gcc-style inline asm, but it does
......@@ -337,12 +366,12 @@ tas(volatile slock_t *lock)
#include <alpha/builtins.h>
#define S_INIT_LOCK(lock) (*(lock) = 0)
#define TAS(lock) (__LOCK_LONG_RETRY((lock), 1) == 0)
#define S_UNLOCK(lock) __UNLOCK_LONG(lock)
#define TAS(lock) (__LOCK_LONG_RETRY((lock), 1) == 0)
#define S_UNLOCK(lock) __UNLOCK_LONG(lock)
#endif /* defined(__GNUC__) */
#endif /* defined(__GNUC__) */
#endif /* __alpha */
#endif /* __alpha */
#if defined(__hpux)
......@@ -373,18 +402,18 @@ do { \
*
* Note that slock_t under QNX is sem_t instead of char
*/
#define TAS(lock) (sem_trywait((lock)) < 0)
#define S_UNLOCK(lock) sem_post((lock))
#define S_INIT_LOCK(lock) sem_init((lock), 1, 1)
#define S_LOCK_FREE(lock) ((lock)->value)
#endif /* __QNX__ */
#define TAS(lock) (sem_trywait((lock)) < 0)
#define S_UNLOCK(lock) sem_post((lock))
#define S_INIT_LOCK(lock) sem_init((lock), 1, 1)
#define S_LOCK_FREE(lock) ((lock)->value)
#endif /* __QNX__ */
#if defined(__sgi)
/*
* SGI IRIX 5
* slock_t is defined as a unsigned long. We use the standard SGI
* mutex API.
* mutex API.
*
* The following comment is left for historical reasons, but is probably
* not a good idea since the mutex ABI is supported.
......@@ -402,7 +431,7 @@ do { \
#if defined(sinix)
/*
* SINIX / Reliant UNIX
* SINIX / Reliant UNIX
* slock_t is defined as a struct abilock_t, which has a single unsigned long
* member. (Basically same as SGI)
*
......@@ -412,7 +441,7 @@ do { \
#define S_INIT_LOCK(lock) init_lock(lock)
#define S_LOCK_FREE(lock) (stat_lock(lock) == UNLOCKED)
#endif /* sinix */
#if defined(_AIX)
/*
......@@ -440,7 +469,7 @@ do { \
#else /* !HAS_TEST_AND_SET */
#else /* !HAS_TEST_AND_SET */
/*
* Fake spinlock implementation using SysV semaphores --- slow and prone
......@@ -451,19 +480,19 @@ do { \
typedef struct
{
/* reference to semaphore used to implement this spinlock */
IpcSemaphoreId semId;
int sem;
IpcSemaphoreId semId;
int sem;
} 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);
extern int tas_sema(volatile slock_t *lock);
extern int tas_sema(volatile slock_t *lock);
#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)
#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)
#endif /* HAS_TEST_AND_SET */
......
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