| 摘要 |
A system, method and computer program product for synchronizing adjustment of a time of day (TOD) clock for a computer system having multiple CPUs, each CPU having an associated physical clock providing a time base for executing operations that is stepping to a common oscillator, and an associated logical TOD clock. The method includes detecting propagation of a carry at a pre-determined bit position of the physical clock associated with a CPU in the computer system; and, updating, in response to the detecting of the pre-determined bit position carry, a TOD-clock offset value (d) to be added to a physical clock value (Tr) value to obtain a logical TOD clock value (Tb) for use by a CPU in the system. In this manner, each CPU computes a new logical TOD clock value in synchronization-the new logical TOD clock value taking effect simultaneously for the multiple CPUs.
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