Commit b3675fc5 authored by heikki@donna.mysql.fi's avatar heikki@donna.mysql.fi
Browse files

sync0sync.ic InnoDB now uses XCHG to implement mutex if GCC and x86 

configure.in	InnoDB now uses XCHG to implement mutex if GCC and x86
parent 49ac18c7

BitKeeper/etc/logging_ok

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mwagner@evoq.mwagner.org

sasha@mysql.sashanet.com

heikki@donna.mysql.fi

innobase/configure.in

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@@ -95,6 +95,11 @@ case "$target_os" in 
	 CFLAGS="$CFLAGS -DUNIV_MUST_NOT_INLINE";;

esac



case "$target" in

       i[[4567]]86-*-*)

	 CFLAGS="$CFLAGS -DUNIV_INTEL_X86";;

esac



AC_OUTPUT(Makefile os/Makefile ut/Makefile btr/Makefile

		buf/Makefile com/Makefile data/Makefile

		dict/Makefile dyn/Makefile

innobase/include/sync0sync.ic

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@@ -86,6 +86,20 @@ mutex_test_and_set( 
	/* mutex_fence(); */



	return(res);

#elif defined(__GNUC__) && defined(UNIV_INTEL_X86)

	ulint*	lw;

	ulint	res;



	lw = &(mutex->lock_word);



	/* In assembly we use the so-called AT & T syntax where

	the order of operands is inverted compared to the ordinary Intel

	syntax. The 'l' after the mnemonics denotes a 32-bit operation. */



	asm volatile("movl $1, %%eax; xchgl (%%ecx), %%eax" :

	              "=eax" (res):

	              "ecx" (lw));

	return(res);

#else

	ibool	ret;