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cacff1be88
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 | ||