m68k problem and libstdc++

[Andreas Schwab]

Craig Rodrigues <rodrigc@mediaone.net> writes:

|> -static inline _Atomic_word 
|> +static inline _Atomic_word
|>  __attribute__ ((__unused__))
|>  __exchange_and_add (volatile _Atomic_word *__mem, int __val)
|>  {
|>    register _Atomic_word __result = *__mem;
|> +
|> +#if defined(__mcpu32__) || defined(__mcf5400__)
|> +  static char __lock = 0;	// needs to be a byte
|> +
|> +  // tas method
|> +  __asm__ __volatile__ ( "1: tas %1;"
|> +		 	 "   jbne 1b;"
|> +			 "   move%.l %3, %0;"
|> +			 "   add%.l %2, %3;"
|> +			 "   clrb %1;"
|> +			 : "=d" (__result), "=m" (__lock)
|> +			 : "d" (__val), "m" (*__mem), "0" (__result)
|> +			 : "memory");

This does not work.  The spinlock must be part of _Atomic_word.

Andreas.

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Andreas Schwab, SuSE Labs, schwab@suse.de
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