Соответственно, вопрос лишь в количестве переменных? Ибо, согласно http://msdn.microsoft.com/en-us/library/aa645755(VS.71).aspx статейке, lock и volatile - это всё-таки одно и то же (насколько я понял).
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When a field-declaration includes a volatile modifier, the fields introduced by that declaration are volatile fields.
For non-volatile fields, optimization techniques that reorder instructions can lead to unexpected and unpredictable results in multi-threaded programs that access fields without synchronization such as that provided by the lock-statement (Section 8.12). These optimizations can be performed by the compiler, by the runtime system, or by hardware. For volatile fields, such reordering optimizations are restricted:
A read of a volatile field is called a volatile read. A volatile read has "acquire semantics"; that is, it is guaranteed to occur prior to any references to memory that occur after it in the instruction sequence.
A write of a volatile field is called a volatile write. A volatile write has "release semantics"; that is, it is guaranteed to happen after any memory references prior to the write instruction in the instruction sequence.
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