{"schema_version":"1.0","canonical_url":"https://patentable.app/patents/US-8495309","patent":{"patent_number":"US-8495309","title":"Variable length data protected by seqlock","assignee":null,"inventors":[],"filing_date":"2010-10-22T00:00:00.000Z","publication_date":"2013-07-23T00:00:00.000Z","cpc_codes":["G06F"],"num_claims":20,"abstract":"Various embodiments of systems and methods for variable length data protected by Seqlock are described herein. Seqlock is a special locking mechanism used in data structures for multithreaded applications that can be read very quickly, when there are no changes being made, at the cost of needing to repeat a read operation when writing has occurred. A Seqlock, in normal use, can only protect a fixed-size data structure with no pointers. This is because the writing thread may invalidate a pointer after a reading thread has followed it. The embodiments specify an algorithm where a Seqlock-protected pointer, once written, is never invalidated. This removes the “no pointers” restriction, allowing the Seqlock to protect a simple singly-linked list, which can be safely increased in size while being read by other threads. The innovation includes the use of the write-once head and next pointers, and the always valid end iterator."},"analysis":{"summary":null,"layman_explanation":null,"technical_analysis":null,"business_analysis":null,"faqs":null,"topics":[],"tech_cluster":null},"seo":{"title":"Variable length data protected by seqlock","description":"Various embodiments of systems and methods for variable length data protected by Seqlock are described herein. Seqlock is a special locking mechanism used in data structures for multithreaded applicat","keywords":[]},"attribution":{"source":"Patentable","source_url":"https://patentable.app","canonical_url":"https://patentable.app/patents/US-8495309","license":"CC-BY-4.0-like","license_terms":"AI-generated analysis on this page (summary, layman_explanation, technical_analysis, business_analysis, faqs) may be reused with attribution and a visible link back to the canonical URL above. Patent abstracts, claims, and bibliographic data are USPTO public domain.","required_link":"https://patentable.app/patents/US-8495309","citation_suggestion":"Patentable. \"Variable length data protected by seqlock\" (US-8495309). https://patentable.app/patents/US-8495309","copyright_holder":"Nomic Interactive Technology LLC"},"links":{"html":"https://patentable.app/patents/US-8495309","json":"https://patentable.app/api/llm-context/US-8495309","site":"https://patentable.app","llms_txt":"https://patentable.app/llms.txt"},"generated_at":"2026-05-31T06:57:15.691Z"}