초록 ▼

An apparatus is disclosed for performing dynamic synchronization between data stored in a handheld computer and a host computer, each having a plurality of data sets including at least one common data set, each computer having a copy of the common data set. The handheld computer has a processor, a c

An apparatus is disclosed for performing dynamic synchronization between data stored in a handheld computer and a host computer, each having a plurality of data sets including at least one common data set, each computer having a copy of the common data set. The handheld computer has a processor, a communication port, and a data synchronization engine. The data synchronization engine has a pseudo-cache and one or more tags connected to the pseudo cache. Data is synchronized whenever data is written to main memory and/or when the associated pseudo-cache tag is invalidated. By strict adherence to a set of protocols, data coherency is achieved because the system always knows who owns the data, who has a copy of the data, and who has modified the data. The data synchronization engine resolves any differences in the copies and allows the storage of identical copies of the common data set in the host computer and in the handheld computer.

대표청구항 ▼

[ I claim:] [1.] A handheld computer adapted to communicate with a host computer, the host computer having a data set including logical data elements of a user database, the handheld computer comprising:a processor;a common data set which is a shared version of the host computer data set, the common

[ I claim:] [1.] A handheld computer adapted to communicate with a host computer, the host computer having a data set including logical data elements of a user database, the handheld computer comprising:a processor;a common data set which is a shared version of the host computer data set, the common data set including the logical elements of the user database;a communication port coupled to said processor, said communication port adapted to link said processor with the host computer; anda data synchronization engine coupled to said processor and said communication port, said data synchronization engine including:one or more tags, each of said tags corresponding to one of the logical data elements in the user database, each of said tags including at least a modified flag; anda pseudo cache engine coupled to the processor that maintains the states of each of said tags responsive to changes to corresponding ones of the logical data elements in the user database;wherein said data synchronization engine initiates a synchronization of a logical data element with the host computer over the communication port when an associated one of the tags is modified in the pseudo cache.