Systems and methods for implementing a multi-host record lock mechanism

A computer program product, comprising:

• a non-transitory computer-readable medium comprising instructions which, when executed by a processor of a computing system, cause the processor to perform the steps of:
• determining whether a program check condition exists;
• determining whether a lock descriptor of a lock in a file lock table satisfies an unlocking condition;
• releasing the lock by setting the lock descriptor's host identifier as zero;
• determining whether any lock in the file lock table satisfies a lock conflict condition;
• determining whether the file lock table has an available lock descriptor;
• and
• creating a new lock using the lock descriptor that satisfies the locking condition,

An apparatus, comprising:

• a memory;
• and
• a processor coupled to the memory, the processor being configured to perform the steps of:
• determining whether a program check condition exists;
• determining whether a lock descriptor of a lock in a file lock table satisfies an unlocking condition;
• releasing the lock by setting the lock descriptor's host identifier as zero;
• determining whether any lock in the file lock table satisfies a lock conflict condition;
• determining whether the file lock table has an available lock descriptor that satisfies a locking condition;
• and
• creating a new lock using the lock descriptor that satisfies the locking condition.