| 主权项 |
1. A computer program product for executing a machine instruction in a computing environment, the machine instruction for initiating a transaction, wherein stores by other processors to storage locations of the transaction cause the transaction to abort, and wherein stores by instructions in the transaction are effectively delayed until a selected transaction completes, said computer program product comprising:
a non-transitory computer readable storage medium readable by a processing circuit and storing instructions for execution by the processing circuit for performing a method comprising:
obtaining, by a processor, a machine instruction for operation, the machine instruction being defined for computer execution according to a computer architecture, the machine instruction comprising:
an operation code to specify a transaction begin operation; anda control field to specify one or more controls to be used in transactional execution; andexecuting, by the processor, the machine instruction, the executing comprising:
determining from a field of the instruction whether a transaction to be initiated by the transaction begin instruction is a constrained transaction or a nonconstrained transaction;based on the field being one value, initiating a constrained transaction, and setting a condition code to a value indicating successful execution of the machine instruction, said constrained transaction having one or more restrictions associated therewith, the one or more restrictions including at least one of a subset of general instructions is available, a limited number of instructions is to be executed, a limited number of storage-operand locations is to be accessed, or the constrained transaction is limited to a single nesting level;based on the field being another value, designating a storage location for storing diagnostic information in an aborted nonconstrained transaction, initiating the nonconstrained transaction, and setting a condition code to the value indicating successful execution of the machine instruction; andwherein the field indicates a nonconstrained transaction, and wherein the machine instruction further comprises a base field to be used in executing the transaction, and wherein based on the base field comprising one value, contents of a register specified by the base field are combined with contents of a displacement field to create a first operand address, the first operand address designating a location of a transaction diagnostic block usable to store the diagnostic information on an abort. |
