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/*-
* Copyright (c) 2014-2015 MongoDB, Inc.
* Copyright (c) 2008-2014 WiredTiger, Inc.
* All rights reserved.
*
* See the file LICENSE for redistribution information.
*/
/*
* Publish a value to a shared location. All previous stores must complete
* before the value is made public.
*/
#define WT_PUBLISH(v, val) do { \
WT_WRITE_BARRIER(); \
(v) = (val); \
} while (0)
/*
* Read a shared location and guarantee that subsequent reads do not see any
* earlier state.
*/
#define WT_ORDERED_READ(v, val) do { \
(v) = (val); \
WT_READ_BARRIER(); \
} while (0)
/*
* Atomic versions of the flag set/clear macros.
*/
#define F_ISSET_ATOMIC(p, mask) ((p)->flags_atomic & (uint8_t)(mask))
#define F_SET_ATOMIC(p, mask) do { \
uint8_t __orig; \
do { \
__orig = (p)->flags_atomic; \
} while (!__wt_atomic_cas8( \
&(p)->flags_atomic, __orig, __orig | (uint8_t)(mask))); \
} while (0)
#define F_CAS_ATOMIC(p, mask, ret) do { \
uint8_t __orig; \
ret = 0; \
do { \
__orig = (p)->flags_atomic; \
if ((__orig & (uint8_t)(mask)) != 0) { \
ret = EBUSY; \
break; \
} \
} while (!__wt_atomic_cas8( \
&(p)->flags_atomic, __orig, __orig | (uint8_t)(mask))); \
} while (0)
#define F_CAS_ATOMIC_WAIT(p, mask) do { \
int __ret; \
for (;;) { \
F_CAS_ATOMIC(p, mask, __ret); \
if (__ret == 0) \
break; \
__wt_yield(); \
} \
} while (0)
#define F_CLR_ATOMIC(p, mask) do { \
uint8_t __orig; \
do { \
__orig = (p)->flags_atomic; \
} while (!__wt_atomic_cas8( \
&(p)->flags_atomic, __orig, __orig & ~(uint8_t)(mask))); \
} while (0)
#define WT_CACHE_LINE_ALIGNMENT 64 /* Cache line alignment */
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