*
*
* 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 $
*
*-------------------------------------------------------------------------
*/
*
* 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
* unsigned spins = 0;
*
* while (TAS(lock))
- * {
* S_LOCK_SLEEP(lock, spins++);
- * }
* }
*
* where S_LOCK_SLEEP() checks for timeout and sleeps for a short
/* 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)
* 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)
{
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;
}
#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__)
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__)
{
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;
}
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)
{
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;
}
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 */
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
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__) */
#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
#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)
*
* 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.
#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)
*
#define S_INIT_LOCK(lock) init_lock(lock)
#define S_LOCK_FREE(lock) (stat_lock(lock) == UNLOCKED)
#endif /* sinix */
-
+
#if defined(_AIX)
/*
-#else /* !HAS_TEST_AND_SET */
+#else /* !HAS_TEST_AND_SET */
/*
* Fake spinlock implementation using SysV semaphores --- slow and prone
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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