correct way to catch exception with Python 'with' statement

[Marko Rauhamaa]

Grant Edwards <grant.b.edwards at gmail.com>:
> In general CISC processors like x86, AMD64, 68K have read-modify-write
> instructions that allow you to increment a memory location or
> set/clear a bit in memory with a single instruction:
>
>     INC.W  [R0]    # increment memory word whose addr is in register R0

The x86 instruction set has a special lock prefix for the purpose:

   <URL: http://stackoverflow.com/questions/8891067/what-does-the-lock-ins
   truction-mean-in-x86-assembly>


Marko