[PATCH] Add support for C++2a stop_token

[Jonathan Wakely]

On 15/11/19 14:38 +0000, Jonathan Wakely wrote:
>On 13/11/19 17:59 -0800, Thomas Rodgers wrote:
>>+  // TODO verify the standard requires this
>>+#if 0
>>+  // register another callback
>>+  bool cb3called{false};
>>+  std::stop_callback scb3{stok, [&]
>>+                                {
>>+                                  cb3called = true;
>>+                                }};
>>+  VERIFY(ssrc.stop_possible());
>>+  VERIFY(ssrc.stop_requested());
>>+  VERIFY(stok.stop_possible());
>>+  VERIFY(stok.stop_requested());
>>+  VERIFY(!cb1called);
>>+  VERIFY(cb2called);
>>+  VERIFY(cb3called);
>>+#endif
>
>The working draft definitely requires this:
>
>Effects: Initializes callback with std::forward<C>(cb). If st.stop_requested() is true, then
>std::forward<Callback>(callback)() is evaluated in the current thread before the constructor
>returns.

I've committed this fix to the nostopstate initializer, so it defines
a variable, instead of declaring a function. I've also added a test
that uses the stop_source(nostopstate_t) constructor, and a few other
tweaks to include the new header where it's needed.

Tested powerpc64le-linux, committed to trunk.

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