Reentrant lock
A reentrant lock is a mutual-exclusion lock that its owning thread can acquire repeatedly, requiring a matching release for each acquisition.
Python Concurrency with asyncio
A reentrant lock is a synchronization lock that its owning thread can acquire multiple times, requiring a matching release for each acquisition.
- How it is used
- Prevents recursive or nested same-thread lock acquisition from hanging while synchronizing shared data in threaded programs.
- How deep it goes
- Explains recursive acquisition, matching release, and internal counting, but defers implementation details beyond the recursion count.
- Examples
- Demonstrates recursive list summation and a thread-safe integer list with nested locked method calls.
- What you can do after
- Diagnose/debug with it by recognizing self-deadlock and replacing Lock with threading.RLock when same-thread reentry is required.
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Advanced Algorithms and Data Structures
A reentrant lock is a lock that allows the thread holding it to acquire it repeatedly, tracking nested acquisitions with a counter until matching releases occur.
- How it is used
- Coordinates concurrent cache-method access while allowing flexible read-versus-write locking.
- How deep it goes
- Defines locking and demonstrates same-thread reacquisition, but defers detailed lock internals and deadlock prevention.
- Examples
- Uses concurrent set calls and a set-to-evictOneEntry call chain to illustrate waiting and nested lock acquisition.
- What you can do after
- Apply it via Java's ReentrantReadWriteLock when nested cache operations require flexible synchronization.
Read how Advanced Algorithms and Data Structures explains reentrant lock →
Related concepts
- lockingkind of · Locking is a synchronization technique that restricts concurrent access to shared resources or protected operations.
- deadlockaddresses · A deadlock is a state in concurrent execution where two or more activities are indefinitely blocked by dependencies on resources, events, or progress that cannot become available.
- threading moduleproduced by · The threading module is Python’s standard-library interface for creating, managing, and coordinating threads and thread-synchronization primitives.
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