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| author | Richard W.M. Jones <rjones@redhat.com> | 2012-02-15 16:54:05 +0000 |
|---|---|---|
| committer | Richard W.M. Jones <rjones@redhat.com> | 2012-03-01 12:47:37 +0000 |
| commit | 9d8eed41294b5dbcbdf543511338eb21aa230a7f (patch) | |
| tree | 2220ffc7dea1a550f80919af7ef9f428141865a1 /python/t | |
| parent | 5d1d5d13194f75b4fc90f7ad673e04ab51634637 (diff) | |
| download | libguestfs-9d8eed41294b5dbcbdf543511338eb21aa230a7f.tar.gz libguestfs-9d8eed41294b5dbcbdf543511338eb21aa230a7f.tar.xz libguestfs-9d8eed41294b5dbcbdf543511338eb21aa230a7f.zip | |
appliance: Make appliance building thread-safe (RHBZ#790721).
Appliance building can be called from multiple processes, but this is
only safe if each process holds a lock on the 'checksum' file.
However threads within a process are not excluded by a file lock, and
so this strategy completely failed for a multithreaded program calling
guestfs_launch in parallel.
Since it makes no sense for threads in a single program to race each
other to try to create the appliance, add a lock around appliance
building.
This serialises building the appliance, but the rest of guestfs_launch
(eg. starting up qemu) can run in parallel.
(cherry picked from commit afed7e493dcd594620f19b93e9fb73e58553f60a)
Diffstat (limited to 'python/t')
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