/usr/include/opencascade/Standard_Atomic.hxx is in libopencascade-foundation-dev 6.5.0.dfsg-2build1.
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// 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.
//!
//! Currently only two x86-based configurations (Windows NT with
//! MS VC++ compiler and Linix with GCC) are really supported.
//! Other configurations use non-atomic C equivalent.
//! @fn void Standard_Atomic_Increment (int volatile* var)
//! @brief Increments atomically integer variable pointed by var
//! @fn int Standard_Atomic_DecrementTest (int volatile* var)
//! @brief Decrements atomically integer variable pointed by var;
//! returns 1 if result is zero, 0 otherwise
//===================================================
// Windows NT, MSVC++ compiler
//===================================================
#if defined(WNT)
extern "C" {
long _InterlockedIncrement(long volatile* lpAddend);
long _InterlockedDecrement(long volatile* lpAddend);
}
#pragma intrinsic (_InterlockedIncrement)
#pragma intrinsic (_InterlockedDecrement)
inline void Standard_Atomic_Increment (int volatile* var)
{
_InterlockedIncrement (reinterpret_cast<long volatile*>(var));
}
inline int Standard_Atomic_DecrementTest (int volatile* var)
{
return _InterlockedDecrement (reinterpret_cast<long volatile*>(var)) == 0;
}
//===================================================
// GCC compiler on x86 or x86_64
// Note: Linux kernel 2.6x provides definitions for atomic operators
// in the header file /usr/include/asm/atomic.h,
// however these definitions involve specific type atomic_t
// Note: The same code probably would work for Intel compiler
//===================================================
#elif defined(__GNUG__) && (defined(__i386) || defined(__x86_64))
inline void Standard_Atomic_Increment (int volatile* var)
{
// C equivalent:
// ++(*var);
__asm__ __volatile__
(
"lock incl %0"
: "=m"(*var) // out
: "m" (*var) // in
);
}
inline int Standard_Atomic_DecrementTest (int volatile* var)
{
// C equivalent:
// return --(*var) == 0;
unsigned char c;
__asm__ __volatile__
(
"lock decl %0; sete %1"
: "=m"(*var), "=qm"(c) // out
: "m" (*var) // in
: "memory"
);
return c != 0;
}
//===================================================
// GCC extension for atomic operations
// http://gcc.gnu.org/wiki/Atomic
//===================================================
#elif defined(__GNUG__) && !defined(__sparc_v9) && !defined(__sparc_v9__) // _Atomic_word is not an int on SPARC V9
#include <ext/atomicity.h>
inline void Standard_Atomic_Increment (int* var)
{
// C equivalent:
// ++(*var);
__gnu_cxx::__atomic_add_dispatch(static_cast<_Atomic_word*>(var), 1);
}
inline int Standard_Atomic_DecrementTest (int* var)
{
// C equivalent:
// return --(*var) == 0;
return __gnu_cxx::__exchange_and_add_dispatch(static_cast<_Atomic_word*>(var),-1) == 1;
}
//===================================================
// Default stub implementation, not atomic actually
//===================================================
#else
inline void Standard_Atomic_Increment (int volatile* var)
{
++(*var);
}
inline int Standard_Atomic_DecrementTest (int volatile* var)
{
return --(*var) == 0;
}
#endif
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