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/*
* librdkafka - The Apache Kafka C/C++ library
*
* Copyright (c) 2014-2016 Magnus Edenhill
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef _RDATOMIC_H_
#define _RDATOMIC_H_
#include "tinycthread.h"
typedef struct {
int32_t val;
#if !defined(_WIN32) && !HAVE_ATOMICS_32
mtx_t lock;
#endif
} rd_atomic32_t;
typedef struct {
int64_t val;
#if !defined(_WIN32) && !HAVE_ATOMICS_64
mtx_t lock;
#endif
} rd_atomic64_t;
static RD_INLINE RD_UNUSED void rd_atomic32_init(rd_atomic32_t *ra, int32_t v) {
ra->val = v;
#if !defined(_WIN32) && !HAVE_ATOMICS_32
mtx_init(&ra->lock, mtx_plain);
#endif
}
static RD_INLINE int32_t RD_UNUSED rd_atomic32_add(rd_atomic32_t *ra,
int32_t v) {
#ifdef __SUNPRO_C
return atomic_add_32_nv(&ra->val, v);
#elif defined(_WIN32)
return InterlockedAdd((LONG *)&ra->val, v);
#elif !HAVE_ATOMICS_32
int32_t r;
mtx_lock(&ra->lock);
ra->val += v;
r = ra->val;
mtx_unlock(&ra->lock);
return r;
#else
return ATOMIC_OP32(add, fetch, &ra->val, v);
#endif
}
static RD_INLINE int32_t RD_UNUSED rd_atomic32_sub(rd_atomic32_t *ra,
int32_t v) {
#ifdef __SUNPRO_C
return atomic_add_32_nv(&ra->val, -v);
#elif defined(_WIN32)
return InterlockedAdd((LONG *)&ra->val, -v);
#elif !HAVE_ATOMICS_32
int32_t r;
mtx_lock(&ra->lock);
ra->val -= v;
r = ra->val;
mtx_unlock(&ra->lock);
return r;
#else
return ATOMIC_OP32(sub, fetch, &ra->val, v);
#endif
}
/**
* @warning The returned value is the nominal value and will be outdated
* by the time the application reads it.
* It should not be used for exact arithmetics, any correlation
* with other data is unsynchronized, meaning that two atomics,
* or one atomic and a mutex-protected piece of data have no
* common synchronization and can't be relied on.
*/
static RD_INLINE int32_t RD_UNUSED rd_atomic32_get(rd_atomic32_t *ra) {
#if defined(_WIN32) || defined(__SUNPRO_C)
return ra->val;
#elif !HAVE_ATOMICS_32
int32_t r;
mtx_lock(&ra->lock);
r = ra->val;
mtx_unlock(&ra->lock);
return r;
#else
return ATOMIC_OP32(fetch, add, &ra->val, 0);
#endif
}
static RD_INLINE int32_t RD_UNUSED rd_atomic32_set(rd_atomic32_t *ra,
int32_t v) {
#ifdef _WIN32
return InterlockedExchange((LONG *)&ra->val, v);
#elif !HAVE_ATOMICS_32
int32_t r;
mtx_lock(&ra->lock);
r = ra->val = v;
mtx_unlock(&ra->lock);
return r;
#elif HAVE_ATOMICS_32_ATOMIC
__atomic_store_n(&ra->val, v, __ATOMIC_SEQ_CST);
return v;
#elif HAVE_ATOMICS_32_SYNC
(void)__sync_lock_test_and_set(&ra->val, v);
return v;
#else
return ra->val = v; // FIXME
#endif
}
static RD_INLINE RD_UNUSED void rd_atomic64_init(rd_atomic64_t *ra, int64_t v) {
ra->val = v;
#if !defined(_WIN32) && !HAVE_ATOMICS_64
mtx_init(&ra->lock, mtx_plain);
#endif
}
static RD_INLINE int64_t RD_UNUSED rd_atomic64_add(rd_atomic64_t *ra,
int64_t v) {
#ifdef __SUNPRO_C
return atomic_add_64_nv(&ra->val, v);
#elif defined(_WIN32)
return InterlockedAdd64(&ra->val, v);
#elif !HAVE_ATOMICS_64
int64_t r;
mtx_lock(&ra->lock);
ra->val += v;
r = ra->val;
mtx_unlock(&ra->lock);
return r;
#else
return ATOMIC_OP64(add, fetch, &ra->val, v);
#endif
}
static RD_INLINE int64_t RD_UNUSED rd_atomic64_sub(rd_atomic64_t *ra,
int64_t v) {
#ifdef __SUNPRO_C
return atomic_add_64_nv(&ra->val, -v);
#elif defined(_WIN32)
return InterlockedAdd64(&ra->val, -v);
#elif !HAVE_ATOMICS_64
int64_t r;
mtx_lock(&ra->lock);
ra->val -= v;
r = ra->val;
mtx_unlock(&ra->lock);
return r;
#else
return ATOMIC_OP64(sub, fetch, &ra->val, v);
#endif
}
/**
* @warning The returned value is the nominal value and will be outdated
* by the time the application reads it.
* It should not be used for exact arithmetics, any correlation
* with other data is unsynchronized, meaning that two atomics,
* or one atomic and a mutex-protected piece of data have no
* common synchronization and can't be relied on.
* Use with care.
*/
static RD_INLINE int64_t RD_UNUSED rd_atomic64_get(rd_atomic64_t *ra) {
#if defined(_WIN32) || defined(__SUNPRO_C)
return InterlockedCompareExchange64(&ra->val, 0, 0);
#elif !HAVE_ATOMICS_64
int64_t r;
mtx_lock(&ra->lock);
r = ra->val;
mtx_unlock(&ra->lock);
return r;
#else
return ATOMIC_OP64(fetch, add, &ra->val, 0);
#endif
}
static RD_INLINE int64_t RD_UNUSED rd_atomic64_set(rd_atomic64_t *ra,
int64_t v) {
#ifdef _WIN32
return InterlockedExchange64(&ra->val, v);
#elif !HAVE_ATOMICS_64
int64_t r;
mtx_lock(&ra->lock);
ra->val = v;
r = ra->val;
mtx_unlock(&ra->lock);
return r;
#elif HAVE_ATOMICS_64_ATOMIC
__atomic_store_n(&ra->val, v, __ATOMIC_SEQ_CST);
return v;
#elif HAVE_ATOMICS_64_SYNC
(void)__sync_lock_test_and_set(&ra->val, v);
return v;
#else
return ra->val = v; // FIXME
#endif
}
#endif /* _RDATOMIC_H_ */
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