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// File: Standard_Atomic.hxx
// Created: Tue Sep 04 08:52:43 2007
// Author: Andrey BETENEV
//! @file
//! Implementation of some atomic operations (elementary operations
//! with data that cannot be interrupted by parallel threads in the
//! multithread process) on various platforms
//!
//! By the moment, only operations necessary for reference counter
//! in Standard_Transient objects are implemented.
//!
//! This is preffered to use fixed size types "int32_t" / "int64_t" for
//! correct function declarations however we leave "int" assuming it is 32bits for now.
#ifndef _Standard_Atomic_HeaderFile
#define _Standard_Atomic_HeaderFile
#include <Standard_Macro.hxx>
#if defined(_MSC_VER) || defined(__BORLANDC__)
#ifdef __BORLANDC__
extern "C" {
__declspec(dllimport) long __stdcall InterlockedIncrement ( long volatile *lpAddend);
__declspec(dllimport) long __stdcall InterlockedDecrement ( long volatile *lpAddend);
}
#define _InterlockedIncrement InterlockedIncrement
#define _InterlockedDecrement InterlockedDecrement
#elif defined(_MSC_VER)
extern "C" {
long _InterlockedIncrement(long volatile* lpAddend);
long _InterlockedDecrement(long volatile* lpAddend);
}
#endif
#endif
#if defined(_MSC_VER)
// force intrinsic instead of WinAPI calls
#pragma intrinsic (_InterlockedIncrement)
#pragma intrinsic (_InterlockedDecrement)
#endif
//! Increments atomically integer variable pointed by theValue
//! and returns resulting incremented value.
static int Standard_Atomic_Increment (volatile int* theValue)
{
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
// mordern g++ compiler (gcc4.4+)
// built-in functions available for appropriate CPUs (at least -march=i486 should be specified on x86 platform)
return __sync_add_and_fetch (theValue, 1);
#elif (defined(_WIN32) || defined(__WIN32__))
// WinAPI function or MSVC intrinsic
return _InterlockedIncrement(reinterpret_cast<long volatile*>(theValue));
#elif defined(LIN)
// use x86 / x86_64 inline assembly (compatibility with alien compilers / old GCC)
int anIncResult;
__asm__ __volatile__ (
#if defined(_OCC64)
"lock xaddl %%ebx, (%%rax) \n\t"
"incl %%ebx \n\t"
: "=b" (anIncResult)
: "a" (theValue), "b" (1)
: "cc", "memory");
#else
"lock xaddl %%eax, (%%ecx) \n\t"
"incl %%eax \n\t"
: "=a" (anIncResult)
: "c" (theValue), "a" (1)
: "memory");
#endif
return anIncResult;
#else
//#error "Atomic operation doesn't implemented for current platform!"
return ++(*theValue);
#endif
}
//! Decrements atomically integer variable pointed by theValue
//! and returns resulting decremented value.
static int Standard_Atomic_Decrement (volatile int* theValue)
{
#ifdef __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4
// mordern g++ compiler (gcc4.4+)
// built-in functions available for appropriate CPUs (at least -march=i486 should be specified on x86 platform)
return __sync_sub_and_fetch (theValue, 1);
#elif (defined(_WIN32) || defined(__WIN32__))
// WinAPI function or MSVC intrinsic
return _InterlockedDecrement(reinterpret_cast<long volatile*>(theValue));
#elif defined(LIN)
// use x86 / x86_64 inline assembly (compatibility with alien compilers / old GCC)
int aDecResult;
__asm__ __volatile__ (
#if defined(_OCC64)
"lock xaddl %%ebx, (%%rax) \n\t"
"decl %%ebx \n\t"
: "=b" (aDecResult)
: "a" (theValue), "b" (-1)
: "cc", "memory");
#else
"lock xaddl %%eax, (%%ecx) \n\t"
"decl %%eax \n\t"
: "=a" (aDecResult)
: "c" (theValue), "a" (-1)
: "memory");
#endif
return aDecResult;
#else
//#error "Atomic operation doesn't implemented for current platform!"
return --(*theValue);
#endif
}
#endif //_Standard_Atomic_HeaderFile
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