/usr/include/wombat/wInterlocked.h is in libmama-dev 2.2.2.1-11.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 | /* $Id$
*
* OpenMAMA: The open middleware agnostic messaging API
* Copyright (C) 2011 NYSE Technologies, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#ifndef _WOMBAT_WINTERLOCKED_H
#define _WOMBAT_WINTERLOCKED_H
/*
* This file contains a set of interlock functions for atomic access on scalar
* variables.
*/
#include "wCommon.h"
/* *************************************************** */
/* Linux implementation. */
/* *************************************************** */
#if defined(__i386__) || defined(__x86_64__)
/* 32-bit atomic exchange. Returns previous value. */
static __inline__ uint32_t
axchg32 (uint32_t* ptr, uint32_t newVal)
{
__asm__ volatile ("xchgl %k0, %1"
: "=r" (newVal)
: "m" (*ptr), "0" (newVal)
: "memory");
return newVal;
}
/* 32-bit atomic increment. */
static __inline__ void
ainc32 (uint32_t* ptr)
{
__asm__ volatile ("lock; incl %0"
: "=m" (*ptr)
: "m" (*ptr));
}
/* 32-bit atomic decrement. */
static __inline__ void
adec32 (uint32_t* ptr)
{
__asm__ volatile ("lock; decl %0"
: "=m" (*ptr)
: "m" (*ptr));
}
#else
#ifdef __GNUC__
/* 32-bit atomic exchange. Returns previous value. */
static __inline__ uint32_t
axchg32 (uint32_t* ptr, uint32_t newVal)
{
/* Warning: behavior not guaranteed to be consistent
on all platforms. Unit tests may be required to validate
on each build.
http://gcc.gnu.org/onlinedocs/gcc-4.3.5/gcc/Atomic-Builtins.html
*/
return __sync_lock_test_and_set(ptr, newVal);
}
/* 32-bit atomic increment. */
static __inline__ void
ainc32 (uint32_t* ptr)
{
__sync_fetch_and_add(ptr, 1);
}
/* 32-bit atomic decrement. */
static __inline__ void
adec32 (uint32_t* ptr)
{
__sync_fetch_and_sub(ptr, 1);
}
#else
#error "Unsupported CPU / compiler combination, please implement atomic functions"
#endif
#endif
/* *************************************************** */
/* Type Defines. */
/* *************************************************** */
/* The structure on linux. */
typedef uint32_t wInterlockedInt;
/**
* This function will initialise a wInterlockedInt.
*
* @param[in] value Pointer to the item to be initialized.
* @return 0 on success.
*/
WCOMMONINLINE int wInterlocked_initialize(wInterlockedInt *value)
{
return 0;
}
/**
* This function will destroy a wInterlockedInt.
*
* @param[in] value Pointer to the item to be destroyed.
* @return 0 on success.
*/
WCOMMONINLINE int wInterlocked_destroy(wInterlockedInt *value)
{
return 0;
}
/**
* This function will atomically decrement a 32-bit integer value.
*
* @param[in] value Pointer to the value to be decremented.
* @return The decremented integer.
*/
WCOMMONINLINE int wInterlocked_decrement(wInterlockedInt *value)
{
adec32(value);
return (int)*value;
}
/**
* This function will atomically increment a 32-bit integer value.
*
* @param[in] value Pointer to the value to be incremented.
* @return The incremented integer.
*/
WCOMMONINLINE int wInterlocked_increment(wInterlockedInt *value)
{
ainc32(value);
return (int)*value;
}
/**
* This function will return the value of the interlocked variable.
*
* @param[in] value Pointer to the value to be read.
* @return The value itself.
*/
WCOMMONINLINE int wInterlocked_read(wInterlockedInt *value)
{
return (int)*value;
}
/**
* This function will atomically set a 32-bit integer value.
*
* @param[in] newValue The new value to set.
* @param[in] value Pointer to the value to be set.
* @return The updated integer.
*/
WCOMMONINLINE int wInterlocked_set(int newValue, wInterlockedInt *value)
{
axchg32(value, (uint32_t)newValue);
return (int)*value;
}
#endif /* _WOMBAT_WINTERLOCKED_H */
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