[Mingw-users] [mingw - C/C++] Inline assembly and GCC in mingw/msys

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By: diepeveen

Hello, 

Please excuse me my ignorance of not knowing the diff between mingw and msys.
I just downloaded it, installed every file i had and pray it works. Perhaps
it would help if there was some icon i could click to install a file X

The question is the only few lines of assembly i have in my program. Locking
of course.

Here is possible defines i have. My question is: "how do i get something to
work with gcc for mingw".

This is what i use currently for the different systems. What will work for x86
for mingw/msys + gcc ?

Many thanks in advance, Vincent Diepeveen
diep xs4all.nl

#if IRIX  /* IRIX */

#if (_MIPS_SZLONG == 32)
#define Lock(v)                    {volatile unsigned long *tmpvar = &((v).abi_lock);
while (*tmpvar); spin_lock(&(v));}
#endif

#if (_MIPS_SZLONG == 64)
#define Lock(v)                    {volatile unsigned int *tmpvar = &((v).abi_lock);
while (*tmpvar); spin_lock(&(v));}
#endif

#define SlowLock(v)      spin_lock(&v)
#define LockInit(v)      init_lock(&v)
#define Unlock(v)        release_lock(&v)
#define lockvar          abilock_t

#elif MSVC /* windows NT */

#define lockvar          volatile int
#define LockInit(v) ((v)=0)
#define Unlock(v)   ((v)=0)

/* voor non-defined compilers onder windows: */
#if NOASSEMBLY

#  define Lock(v)          do {                              while(InterlockedExchange((LPLONG)&(v),1) != 0);
                           } while (0)
#else
__inline void LockA (volatile int *hPtr) {
  __asm {
         mov     ecx, hPtr
    la:  mov     eax, 1
         xchg    eax, [ecx]
         test    eax, eax
         jz      end
    lb:  mov     eax, [ecx]
         test    eax, eax
         jz      la
         jmp     lb
    end:
  }
}
#define Lock(v) LockA(&(v))
#endif
#define SlowLock(v) Lock(&(v))

//#define Lock(v) {if(v){printf("was already
locked\n");StatusSMP();}else{v=1;}}

#elif IA64

#define Lock(v)            spin_lock(&v)
#define SlowLock(v)        spin_lock(&v)
#define LockInit(v)        spin_lock_init(&v)
#define Unlock(v)          spin_unlock(&v)
#define lockvar            spinlock_t

#else /* linux P6/PII/P3/K7 */
  #define lockvar          volatile int
  #define exchange(adr,reg) ({volatile int _ret;asm volatile ("xchg
%0,%1":"=q"(_ret),"=m"(*(adr)):"m"(*(adr)),"0"(reg));_ret;})
  #define LockInit(p)      (p=0)
  #define Unlock(p)        (exchange(&p,0))
  #define SlowLock(p)      while(exchange(&p,1)) while(p)
  #define Lock(p)          while(exchange(&p,1)) while(p)
#endif


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