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T location1 = v1;
T value = v2;
T res = Interlocked.CompareExchange(ref location1, value, conparand)
=
if(location1 == conparand){
res = location1;
location1 = value;
}
else{
res = location1;
}
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原文地址：http://www.cnblogs.com/tq1226112215/p/4517879.html
