Add the concept of a tree variable (TreeVar)#1543
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oremanj wants to merge 9 commits intopython-trio:mainfrom
Open
Add the concept of a tree variable (TreeVar)#1543oremanj wants to merge 9 commits intopython-trio:mainfrom
oremanj wants to merge 9 commits intopython-trio:mainfrom
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…nt nursery rather than from the spawner
Codecov Report
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## master #1543 +/- ##
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Coverage 99.70% 99.71%
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Files 111 111
Lines 14035 14175 +140
Branches 1084 1090 +6
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+ Hits 13994 14134 +140
Misses 27 27
Partials 14 14
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oremanj
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This was referenced Jul 25, 2021
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A TreeVar acts like a context variable that is inherited at nursery creation time (and then by child tasks of that nursery) rather than at task creation time. They are useful for providing 'ambient' access to a resource that is tied to an `async with` block in the parent task, such as an open file or trio-asyncio event loop. Prior art: python-trio/trio#1543 (never made it into mainline Trio). The implementation without Trio core support is somewhat less efficient, but still workable.
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TreeVars are like ContextVars except that their initial value in new tasks is determined differently: they are inherited from the new task's parent nursery rather than from its spawner. #1523 has some discussion of the possible uses.
Fixes #1523