#ifndef _BITS_ATOMICITY_H
#define _BITS_ATOMICITY_H 1
typedef int _Atomic_word;
#if defined(__mc68020__) || defined(__mc68030__) \
|| defined(__mc68040__) || defined(__mc68060__)
static inline _Atomic_word
__attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word *__mem, int __val)
{
register _Atomic_word __result = *__mem;
register _Atomic_word __temp;
__asm__ __volatile__ ("1: move%.l %0,%1\n\t"
"add%.l %2,%1\n\t"
"cas%.l %0,%1,%3\n\t"
"jne 1b"
: "=d" (__result), "=&d" (__temp)
: "d" (__val), "m" (*__mem), "0" (__result)
: "memory");
return __result;
}
#elif defined(__rtems__)
static inline _Atomic_word
__attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word *__mem, int __val)
{
_Atomic_word __result;
short __level, __tmpsr;
__asm__ __volatile__ ("move%.w %%sr,%0\n\tor%.l %0,%1\n\tmove%.w %1,%%sr"
: "=d"(__level), "=d"(__tmpsr) : "1"(0x700));
__result = *__mem;
*__mem = __result + __val;
__asm__ __volatile__ ("move%.w %0,%%sr" : : "d"(__level));
return __result;
}
#elif !defined(__mcf5200__) && !defined(__mcf5300__)
template <int __inst>
struct __Atomicity_lock
{
static volatile unsigned char _S_atomicity_lock;
};
template <int __inst>
volatile unsigned char __Atomicity_lock<__inst>::_S_atomicity_lock = 0;
template volatile unsigned char __Atomicity_lock<0>::_S_atomicity_lock;
static inline _Atomic_word
__attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word *__mem, int __val)
{
_Atomic_word __result;
__asm__ __volatile__("1: tas %0\n\tjbne 1b"
: "=m"(__Atomicity_lock<0>::_S_atomicity_lock)
: "m"(__Atomicity_lock<0>::_S_atomicity_lock));
__result = *__mem;
*__mem = __result + __val;
__Atomicity_lock<0>::_S_atomicity_lock = 0;
return __result;
}
#elif defined(__vxWorks__) || defined(__embedded__)
static inline _Atomic_word
__attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word *__mem, int __val)
{
_Atomic_word __result;
short __level, __tmpsr;
__asm__ __volatile__ ("move%.w %%sr,%0\n\tor%.l %0,%1\n\tmove%.w %1,%%sr"
: "=d"(__level), "=d"(__tmpsr) : "1"(0x700));
__result = *__mem;
*__mem = __result + __val;
__asm__ __volatile__ ("move%.w %0,%%sr" : : "d"(__level));
return __result;
}
#else
#warning "__exchange_and_add is not atomic for this target"
static inline _Atomic_word
__attribute__ ((__unused__))
__exchange_and_add (volatile _Atomic_word *__mem, int __val)
{
_Atomic_word __result;
__result = *__mem;
*__mem = __result + __val;
return __result;
}
#endif
static inline void
__attribute__ ((__unused__))
__atomic_add (volatile _Atomic_word* __mem, int __val)
{
(void) __exchange_and_add (__mem, __val);
}
#endif