Ticket locks with enhanced waiting
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United States of America
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Mar 18, 2025
Grant Date -
May 16, 2024
app pub date -
Jan 22, 2024
filing date -
Jan 22, 2024
priority date (Note) -
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status (Latency Note)
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Abstract
A computer comprising one or more processors and memory may implement multiple threads that perform a lock operation using a data structure comprising an allocation field and a grant field. Upon entry to a lock operation, a thread allocates a ticket by atomically copying a ticket value contained in the allocation field and incrementing the allocation field. The thread compares the allocated ticket to the grant field. If they are unequal, the thread determines a number of waiting threads. If the number is above the threshold, the thread enters a long term wait operation comprising determining a location for long term wait value and waiting on changes to that value. If the number is below the threshold or the long term wait operation is complete, the thread waits for the grant value to equal the ticket to indicate that the lock is allocated.
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