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poll for it (i.e. if we can't acquire the lock, then let the main select() loop wait for at most a few seconds and then try again). This improves parallelism: if two nix-store processes are both trying to build a path at the same time, the second one shouldn't block; it should first see if it can build other goals. Also, it prevents the deadlocks that have been occuring in Hydra lately, where a process waits for a lock held by another process that's waiting for a lock held by the first. The downside is that polling isn't really elegant, but POSIX doesn't provide a way to wait for locks in a select() loop. The only solution would be to spawn a thread for each lock to do a blocking fcntl() and then signal the main thread, but that would require pthreads. |
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.. | ||
build.cc | ||
db.cc | ||
db.hh | ||
derivations-ast.def | ||
derivations.cc | ||
derivations.hh | ||
gc.cc | ||
globals.cc | ||
globals.hh | ||
local-store.cc | ||
local-store.hh | ||
Makefile.am | ||
misc.cc | ||
misc.hh | ||
optimise-store.cc | ||
pathlocks.cc | ||
pathlocks.hh | ||
references.cc | ||
references.hh | ||
remote-store.cc | ||
remote-store.hh | ||
store-api.cc | ||
store-api.hh | ||
upgrade-schema.cc | ||
worker-protocol.hh |