Up(mutex) // or signal(mutex) or // V(mutex)

' other threads that might be waiting for the writer lock.ĭim lc As LockCookie = rwl.UpgradeToWriterLock(timeOut)X. ' the reader lock puts the thread in the write queue, behind any ' request the writer lock, or upgrade the reader lock. ' To write to the resource, either release the reader lock and Sub UpgradeDowngrade(rnd As Random, timeOut As Integer) ' lock, and downgrades it to a reader lock again. ' Requests a reader lock, upgrades the reader lock to the writer ' It's safe for this thread to read or write from the shared resource.ĭisplay('writes resource value ' & resource) Sub WriteToResource(rnd As Random, timeOut As Integer) ' Request and release the writer lock, and handle time-outs. ' It's safe for this thread to read from the shared resource.ĭisplay('reads resource value ' & resource) ' Request and release a reader lock, and handle time-outs.

' Randomly select a way for the thread to read and write from the shared Reads, writes, readerTimeouts, writerTimeouts) It is safe for this thread to read fromĭisplay( String::Format( 'reads resource value writer time-outs.', If ( action AcquireReaderLock( timeOut ) various ways to read and write from the shared As long as a thread runs, it randomly selects For this example, the shared resource protected by the Static ReaderWriterLock^ rwl = gcnew ReaderWriterLock Declaring the ReaderWriterLock at the class level The complete code is located in the ReaderWriterLock resource that is read concurrently and written exclusively This example shows a ReaderWriterLock protecting a shared Note that the ReaderWriterLock is declared at the class level so that it is visible to all threads.

The following example demonstrates how to use a ReaderWriterLock to protect a shared resource, an integer value named resource, that is read concurrently and written exclusively by multiple threads.

Reader writer code