Ketan Mukadam wrote:
> Hi all,
>
> I was going through the code of __wait_event in sched.c [ kernel 2.2.19] and i
> came across a MACRO mb(), and it was defined in asm-i386/system.h as following
>
> #define mb() __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory")
>
> I don't know what this MACRO does?? [ I actually don't know assembly ]
>
> Can anyone help me??
mb() stands for 'memory barrior'... it is a command to prevent the
compiler from re-ordering memory accesses across that point.
Eli
--------------------. "If it ain't broke now,
Eli Carter \ it will be soon." -- crypto-gram
eli.carter(a)inet.com `-------------------------------------------------
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