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由 Federico Simoncelli 提交于
Originally most of libvirt domain-specific calls were blocking during a migration. A new mechanism to allow specific calls (blkstat/blkinfo) to be executed in such condition has been implemented. In the long term it'd be desirable to get a more general solution to mark further APIs as migration safe, without needing special case code. * src/qemu/qemu_migration.c: add some additional job signal flags for doing blkstat/blkinfo during a migration * src/qemu/qemu_domain.c: add a condition variable that can be used to efficiently wait for the migration code to clear the signal flag * src/qemu/qemu_driver.c: execute blkstat/blkinfo using the job signal flags during migration
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