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docu: add not to stack unwinding vor ecv2

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Oliver Kowalke
2016-07-08 07:45:51 +02:00
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commit 205abc22e9
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doc/execution_context_v2.qbk
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@@ -297,13 +297,18 @@ exception.
In this example `f2()` is used to interrupt the `for`-loop in `f1()`.
[heading Stack destruction]
[heading stack unwinding]
On construction of __econtext__ a stack is allocated.
If the __context_fn__ returns the stack will be destructed.
If the __context_fn__ has not yet returned and the destructor of an valid
__econtext__ instance (e.g. ['execution_context::operator bool()] returns
`true`) is called, the stack will be destructed too.
[important Code executed by __context_fn__ must not prevent the propagation of the
__forced_unwind__ exception. Absorbing that exception will cause stack
unwinding to fail. Thus, any code that catches all exceptions must re-throw any
pending __forced_unwind__ exception.]
[#ecv2_prealloc]
[heading allocating control structures on top of stack]