final class TReentrantLock extends AnyRef
A TReentrantLock is a reentrant read/write lock. Multiple readers may all
concurrently acquire read locks. Only one writer is allowed to acquire a
write lock at any given time. Read locks may be upgraded into write locks. A
fiber that has a write lock may acquire other write locks or read locks.
The two primary methods of this structure are readLock, which acquires a
read lock in a scoped context, and writeLock, which acquires a write lock
in a scoped context.
Although located in the STM package, there is no need for locks within STM transactions. However, this lock can be quite useful in effectful code, to provide consistent read/write access to mutable state; and being in STM allows this structure to be composed into more complicated concurrent structures that are consumed from effectful code.
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- lazy val acquireRead: USTM[Int]
Acquires a read lock.
Acquires a read lock. The transaction will suspend until no other fiber is holding a write lock. Succeeds with the number of read locks held by this fiber.
- lazy val acquireWrite: USTM[Int]
Acquires a write lock.
Acquires a write lock. The transaction will suspend until no other fibers are holding read or write locks. Succeeds with the number of write locks held by this fiber.
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- def fiberReadLocks: USTM[Int]
Retrieves the number of acquired read locks for this fiber.
- def fiberWriteLocks: USTM[Int]
Retrieves the number of acquired write locks for this fiber.
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- def lock(implicit trace: Trace): ZIO[Scope, Nothing, Int]
Just a convenience method for applications that only need reentrant locks, without needing a distinction between readers / writers.
Just a convenience method for applications that only need reentrant locks, without needing a distinction between readers / writers.
See writeLock.
- def locked: USTM[Boolean]
Determines if any fiber has a read or write lock.
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- def readLock(implicit trace: Trace): ZIO[Scope, Nothing, Int]
Obtains a read lock in a scoped context.
- def readLocked: USTM[Boolean]
Determines if any fiber has a read lock.
- def readLocks: USTM[Int]
Retrieves the total number of acquired read locks.
- lazy val releaseRead: USTM[Int]
Releases a read lock held by this fiber.
Releases a read lock held by this fiber. Succeeds with the outstanding number of read locks held by this fiber.
- lazy val releaseWrite: USTM[Int]
Releases a write lock held by this fiber.
Releases a write lock held by this fiber. Succeeds with the outstanding number of write locks held by this fiber.
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- def withLock[R, E, A](zio: ZIO[R, E, A])(implicit trace: Trace): ZIO[R, E, A]
Runs the specified workflow with a lock.
- def withReadLock[R, E, A](zio: ZIO[R, E, A])(implicit trace: Trace): ZIO[R, E, A]
Runs the specified workflow with a read lock.
- def withWriteLock[R, E, A](zio: ZIO[R, E, A])(implicit trace: Trace): ZIO[R, E, A]
Runs the specified workflow with a write lock.
- def writeLock(implicit trace: Trace): ZIO[Scope, Nothing, Int]
Obtains a write lock in a scoped context.
- def writeLocked: USTM[Boolean]
Determines if a write lock is held by some fiber.
- def writeLocks: USTM[Int]
Computes the number of write locks held by fibers.