The app works fine if I add the volatile prefix before the variable
declaration.
inline void pincrement(volatile int* target)
{
__asm__ __volatile__ ("pushl %%eax":::);
__asm__ __volatile__ ("lock ; incl (%%eax)" :"=m"(target):"a"(target));
__asm__ __volatile__ ("popl %%eax":::"eax");
}
inline void pdecrement(volatile int* target)
{
__asm__ __volatile__ ("pushl %%eax":::);
__asm__ __volatile__ ("lock ; decl (%%eax)" :"=m"(target):"a"(target));
__asm__ __volatile__ ("popl %%eax":::"eax");
}
int main() {
volatile int my_an = 0;
pincrement(&my_an);
pincrement(&my_an);
pincrement(&my_an);
pdecrement(&my_an);
printf("my_an is %d\n",my_an);
return 0;
}
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