Andrew Trick 89d96bff4e Runtime support for nontracking begin_access. ...

There are multiple reasons to do this. Primarily this is
useful as an optimization. Whenever analysis can determine that no
potentially conflicting access occurs within the scope, the access can
be demoted to "nontracking". It is also useful as an escape hatch for
future code deploying to older runtimes. For example, if a future access
scope may cross threads, and the older runtime doesn't know how to
migrate threads.

See <rdar://problem/37507434> add a flag to swift_beginAccess to inform
the runtime that an access might migrate between threads

2018-03-27 12:04:32 -07:00

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