Oracle International Corporation

Axel Boldt-Christmas

Erik Österlund

Stefan Mats Rikard Karlsson

A system executes a first virtual thread, including storing a first shared object in a first private memory region, storing a pointer in a shared memory region, and determining that the pointer includes a reference to a location of the first shared object in the first private memory region. Responsive to determining that the pointer includes the reference, the system designates the first virtual thread as disqualified from eligibility for execution of a sweeping thread-local garbage collection process and augments the pointer to indicate that the pointer includes the reference to the location of the first shared object. The system executes a second virtual thread, including loading the pointer and determining that the pointer has been augmented. Responsive to determining that the pointer has been augmented, the system designates the second virtual thread as disqualified from eligibility for execution of the sweeping thread-local garbage collection process.

Selecting garbage collection processes

A system selects a first garbage collection process from a group of garbage collection processes. When a first thread stores a first set of objects to a first private memory region that is exclusive of any shared objects accessible by one or more additional threads, the system executes a sweeping thread-local garbage collection process upon termination of the first thread, including reclaiming the first private memory region. When a second thread stores to a second private memory region at least one shared object accessible by one or more additional threads, the system executes the selective garbage collection process upon termination of the second thread. The selective garbage collection process includes selectively reclaiming a second subset of memory blocks from the second private memory region allocated for a subset of private objects that are inaccessible from any thread.

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Stockholm, Sweden

Axel Boldt-Christmas