When the number of places approaches the number of available
processing cores, then a spin lock isn't good enough for a small
number of contended hash tables (maybe just one of them). When
contention is discovered, fall back to a mutex-based lock.
When spawning a new subprocess, it's possible that one or more of the
new process's standard input, output, or error descriptors use file
descriptor 0, 1, or 2, even if they don't correspond to any of the
parent process's original standard input, output, or error descriptors.
This can happen if the parent process closes one of its standard
descriptors, and the operating system reuses the file descriptor number
for a new descriptor.
Therefore, be more careful about closing and copying file descriptors in
the child process before calling `exec`. Specifically, move file
descriptors out of the way as needed so they aren't clobbered, and
accommodate cases where multiple standard streams may share the same
file descriptor in the parent process.
fixes#2634
This reverts commit 9e7fa9b859.
CI had some unexpected results with this new version overnight. As a
result and until I investigate this, let go back to 3.1.0.
A subcustodian was incorrectly registered as weak for its parent,
which means that an unreferenced custodian could get lost when
shutting down an ancestor.
Register the port, not the file descriptor, especially since a TCP
connection can have ports that share a file descriptor. Also, I think
a weak reference in the custodian doesn't work as intended (visible
through finalization) if the file descriptor is referenced with a
callback that closes over the port.
No `syntax-protect` is needed for `define/private`, etc., because no
new identifiers or expressions are introduced. Adding extra dye packs
can interfere with other macros that pull apart syntax (although maybe
the macros shouldn't do that without using `syntax-disarm`).
A custodian doesn't provide any order on shutting down the objects
that it manages (I was confused about some past experiments), so
avoid that assumption.
