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由 Daniel P. Berrange 提交于
ensures that initialization will always take place when it is needed, and guarantees it only occurs once. The problem is that the code to setup a global initializer with proper error propagation is tedious. This introduces VIR_ONCE_GLOBAL_INIT macro to simplify this. Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>
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