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SynchronizedDictionaryAcquireReadLock Method (Int32)

Oracle® Fusion Middleware .NET API Reference for Oracle Coherence
14c (14.1.1.0)
F23534-02
Acquire a read lock.

Namespace:  Tangosol.Util.Collections
Assembly:  Coherence (in Coherence.dll) Version: 14.1.1.14 (14.1.1.14)
Syntax
C#
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public bool AcquireReadLock(
	int timeout
)

Parameters

timeout
Type: SystemInt32
Timeout in milliseconds.

Return Value

Type: Boolean
true if a lock was acquired within the specified time, false otherwise.
Remarks
This method will attempt to acquire a read lock for up to timeout milliseconds, and will return a boolean value specifying whether or not the lock was acquired successfully.

Multiple threads can hold read locks at the same time, but no thread will be able to acquire a write lock until all read locks are released.

This method should always be used in combination with a ReleaseReadLock method in the following manner:

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if (dict.AcquireReadLock(timeout))
{
    try
    {
        // access dictionary
    }
    finally
    {
        dict.ReleaseReadLock();
    }
}
This will ensure that the dictionary is not accessed unless the lock was acquired successfully, and that the lock is released properly even if an exception is thrown by the code within the try block.

It is entirely up to you how to handle the case when the AcquireReadLock method returns false. For example, you can ignore the fact, throw an exception, or retry the operation by placing the code above within a loop.

See Also