Thin Lock Implementation

[Walter Bright]

Sascha Katzner wrote:
> Steven Schveighoffer wrote:
>> On a 32-bit system, the amount of addressable memory space and the
>> stack size are the factors that limit the number of threads.  For
>> example, if addressable space is 2GB, and each thread has a 1MB
>> stack, that's 2000 threads max (this is the typical situation for
>> Windows).
> 
> Not exactly right, since the stack is organized in 4kb pages and these
> pages are not initialized until they are first used they usually require
> a lot less than 1mb.

The memory isn't committed until it is used, but the address space is. 
You cannot move the stack if it exceeds its preallocated address space 
allotment.