International Business Machines Corporation

Li-Chuan J Yang

Jack C Yuan

Jeffrey L Maddix

Elvis B Halcrombe

A method, computer program product and system uses a tiered priority system having three types of callout messages for use by a transaction processing system: (i) callout with a reserved path; (ii) callout with priority; and (iii) default priority callout with sharing mode. An online transaction program (OTP) issues a 'reserve call' associated with a 'callout with a reserved path'. In response, a reserve call processor initiates an asynchronous request to build an express socket path, and returns a special dispatchable unit of work identifier (special DUOW ID). The OTP subsequently issues any number of callouts to be sent on the express socket path using the special DUOW ID. A callout with priority dynamically allocates a path for sending a callout message, without queuing. A sharing mode combines a group of callout messages (types (i), (ii), and/or (iii) above) into a single TCP/IP send without queuing.

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Li-Chuan J Yang