Re: [MinGW-dvlpr] Fw: [Mingw-users] InterlockedCompareExchange (Was:nosubject)

[Wu Y. <ad...@sh...>]

On Thu, 2004-05-27 at 15:29, Danny Smith wrote:
> 
> Anyway,  I just want to provide a way out for W95/i386 in case trylock ever becomes
> useful. I suppose its not important since its really hard to show a regression on code
> that doesn't get used.  It's even harder to show this regression on an OS/cpu combination
> that probably exists only in dusty store rooms and rubbish tips.
> 
> Danny

Hi, Danny, I think one can put a #ifdef inside __gthr_win32_trylock to
return -1, but it is just not worth while.  After all, no people are
expected to use an i386, running 32-bit Windows, and upgrade to new
software.

The new patch is here.

ChangeLog:

2004-05-27  Wu Yongwei  <ad...@sh...>

	* gthr-win32.h (__GTHREAD_MUTEX_INIT_DEFAULT): Adjust.
	(__gthr_i486_lock_cmp_xchg): New inline assembly function.
	(__GTHR_W32_InterlockedCompareExchange): New macro to choose a
	suitable function for interlocked compare-and-exchange.
	(__gthread_mutex_trylock): Use
	__GTHR_W32_InterlockedCompareExchange.
	(__gthread_mutex_init_function, __gthread_mutex_lock,
	__gthread_mutex_trylock, __gthread_mutex_unlock): Adjust the
	initial counter value to work correctly under Windows 95.
	* config/i386/gthr-win32.c: Adjust include order.
	Define __GTHREAD_I486_INLINE_LOCK_PRIMITIVES before including
	gthr-win32.h.
	(__gthr_win32_mutex_init_function, __gthr_win32_mutex_lock,
	__gthr_win32_mutex_trylock, __gthr_win32_mutex_unlock): Adjust
	to match inline versions in gthr-win32.h.

Best regards,

Yongwei