/usr/include/avro/refcount.h is in libavro-dev 1.8.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
* implied. See the License for the specific language governing
* permissions and limitations under the License.
*/
#ifndef AVRO_REFCOUNT_H
#define AVRO_REFCOUNT_H
#if defined(_WIN32) && defined(__cplusplus)
/* Include the C++ file <intrin.h> outside the scope of extern "C" */
#include <intrin.h>
#endif
#ifdef __cplusplus
extern "C" {
#define CLOSE_EXTERN }
#else
#define CLOSE_EXTERN
#endif
/**
* Atomically sets the value of a reference count.
*/
static inline void
avro_refcount_set(volatile int *refcount, int value);
/**
* Increments a reference count, ensuring that its value doesn't
* overflow.
*/
static inline void
avro_refcount_inc(volatile int *refcount);
/**
* Decrements a reference count, and returns whether the resulting
* (decremented) value is 0.
*/
static inline int
avro_refcount_dec(volatile int *refcount);
/*-----------------------------------------------------------------------
* Non-Atomic Reference Count
*/
#if defined(AVRO_NON_ATOMIC_REFCOUNT)
static inline void
avro_refcount_set(volatile int *refcount, int value)
{
*refcount = value;
}
static inline void
avro_refcount_inc(volatile int *refcount)
{
if (*refcount != (int) -1) {
*refcount += 1;
}
}
static inline int
avro_refcount_dec(volatile int *refcount)
{
if (*refcount != (int) -1) {
*refcount -= 1;
return (*refcount == 0);
}
return 0;
}
/*-----------------------------------------------------------------------
* Mac OS X
*/
#elif __ENVIRONMENT_MAC_OS_X_VERSION_MIN_REQUIRED__ >= 1050
#include <libkern/OSAtomic.h>
static inline void
avro_refcount_set(volatile int *refcount, int value)
{
*refcount = value;
}
static inline void
avro_refcount_inc(volatile int *refcount)
{
if (*refcount != (int) -1) {
OSAtomicIncrement32(refcount);
}
}
static inline int
avro_refcount_dec(volatile int *refcount)
{
if (*refcount != (int) -1) {
return (OSAtomicDecrement32(refcount) == 0);
}
return 0;
}
/*-----------------------------------------------------------------------
* GCC intrinsics
*/
#elif (__GNUC__ * 10000 + __GNUC_MINOR__ * 100 + __GNUC_PATCHLEVEL__) > 40500
static inline void
avro_refcount_set(volatile int *refcount, int value)
{
*refcount = value;
}
static inline void
avro_refcount_inc(volatile int *refcount)
{
if (*refcount != (int) -1) {
__sync_add_and_fetch(refcount, 1);
}
}
static inline int
avro_refcount_dec(volatile int *refcount)
{
if (*refcount != (int) -1) {
return (__sync_sub_and_fetch(refcount, 1) == 0);
}
return 0;
}
/*-----------------------------------------------------------------------
* Raw x86 assembly
*/
#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
/* determine the size of int */
#include <limits.h>
#include <avro/platform.h>
#if INT_MAX == INT32_MAX
#define REFCOUNT_SS "l"
#elif INT_MAX == INT64_MAX
#define REFCOUNT_SS "q"
#else
#error "Unknown int size"
#endif
static inline void
avro_refcount_set(volatile int *refcount, int value)
{
*refcount = value;
}
static inline void
avro_refcount_inc(volatile int *refcount)
{
if (*refcount != (int) -1) {
__asm__ __volatile__ ("lock ; inc"REFCOUNT_SS" %0"
:"=m" (*refcount)
:"m" (*refcount));
}
}
static inline int
avro_refcount_dec(volatile int *refcount)
{
if (*refcount != (int) -1) {
char result;
__asm__ __volatile__ ("lock ; dec"REFCOUNT_SS" %0; setz %1"
:"=m" (*refcount), "=q" (result)
:"m" (*refcount));
return result;
}
return 0;
}
#undef REFCOUNT_SS
/*-----------------------------------------------------------------------
* Raw PPC assembly
*/
#elif defined(__GNUC__) && defined(__ppc__)
static inline int
avro_refcount_LL_int(volatile int *ptr)
{
int val;
__asm__ __volatile__ ("lwarx %[val],0,%[ptr]"
: [val] "=r" (val)
: [ptr] "r" (&ptr)
: "cc");
return val;
}
/* Returns non-zero if the store was successful, zero otherwise. */
static inline int
avro_refcount_SC_int(volatile int *ptr, int val)
{
int ret = 1; /* init to non-zero, will be reset to 0 if SC was successful */
__asm__ __volatile__ ("stwcx. %[val],0,%[ptr];\n"
"beq 1f;\n"
"li %[ret], 0;\n"
"1: ;\n"
: [ret] "=r" (ret)
: [ptr] "r" (&ptr), [val] "r" (val), "0" (ret)
: "cc", "memory");
return ret;
}
static inline void
avro_refcount_set(volatile int *refcount, int value)
{
*refcount = value;
}
static inline void
avro_refcount_inc(volatile int *refcount)
{
int prev;
do {
prev = avro_refcount_LL_int(refcount);
if (prev == (int) -1) {
return;
}
} while (!avro_refcount_SC_int(refcount, prev + 1));
}
static inline int
avro_refcount_dec(volatile int *refcount)
{
int prev;
do {
prev = avro_refcount_LL_int(refcount);
if (prev == (int) -1) {
return 0;
}
} while (!avro_refcount_SC_int(refcount, prev - 1));
return prev == 1;
}
/*-----------------------------------------------------------------------
* Windows intrinsics
*/
#elif defined(_WIN32)
#ifdef __cplusplus
// Note: <intrin.h> included outside the extern "C" wrappers above
#else
#include <windows.h>
#include <intrin.h>
#endif // __cplusplus
static inline void
avro_refcount_set(volatile int *refcount, int value)
{
*refcount = value;
}
static inline void
avro_refcount_inc(volatile int *refcount)
{
if (*refcount != (int) -1) {
_InterlockedIncrement((volatile long *) refcount);
}
}
static inline int
avro_refcount_dec(volatile int *refcount)
{
if (*refcount != (int) -1) {
return (_InterlockedDecrement((volatile long *) refcount) == 0);
}
return 0;
}
/*-----------------------------------------------------------------------
* Fallback
*/
#else
#error "No atomic implementation!"
#endif
CLOSE_EXTERN
#endif
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