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asyncdispatch, asyncnet: add inheritance control (#14362)

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* asyncdispatch, asyncnet: add inheritance control

* asyncnet, asyncdispatch: cleanup
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alaviss 2020-05-20 07:42:55 +00:00 • committed by GitHub
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@ -13,20 +13,21 @@
- `deques.peekFirst` and `deques.peekLast` now have `var Deque[T] -> var T` overloads.
- File handles created from high-level abstractions in the stdlib will no longer
be inherited by child processes. In particular, these modules are affected:
`system`, `nativesockets`, `net` and `selectors`.
`asyncdispatch`, `asyncnet`, `system`, `nativesockets`, `net` and `selectors`.
For `net` and `nativesockets`, an `inheritable` flag has been added to all
`proc`s that create sockets, allowing the user to control whether the
resulting socket is inheritable. This flag is provided to ease the writing of
multi-process servers, where sockets inheritance is desired.
For `asyncdispatch`, `asyncnet`, `net` and `nativesockets`, an `inheritable`
flag has been added to all `proc`s that create sockets, allowing the user to
control whether the resulting socket is inheritable. This flag is provided to
ease the writing of multi-process servers, where sockets inheritance is
desired.
For a transistion period, define `nimInheritHandles` to enable file handle
inheritance by default. This flag does **not** affect the `selectors` module
due to the differing semantics between operating systems.
`system.setInheritable` and `nativesockets.setInheritable` is also introduced
for setting file handle or socket inheritance. Not all platform have these
`proc`s defined.
`asyncdispatch.setInheritable`, `system.setInheritable` and
`nativesockets.setInheritable` is also introduced for setting file handle or
socket inheritance. Not all platform have these `proc`s defined.
- The file descriptors created for internal bookkeeping by `ioselector_kqueue`
and `ioselector_epoll` will no longer be leaked to child processes.