If your class has multiple resources protected with locks to achieve thread safety, ReSharper analyzes possible execution paths in multi-threaded environment (assuming public API of the class can be used simultaneously by multiple threads) and the order of locks taken on such execution paths to find cycles leading to possible deadlocks at runtime, as illustrated in the example below. The warning message provides a detailed explanation and an example of a cycle that could be formed.
classMultiThreadedComponent{privateList<string> _resource1 =new();privateList<string> _resource2 =new();publicvoidPublicApi01(){lock(_resource1)lock(_resource2){// do work}}publicvoidPublicApi02(){lock(_resource2){// do workHelperMethod02();// do work}}privatevoidHelperMethod02(){// The expression is used in several lock statements with inconsistent execution order,// forming a cycle. This might lead to a possible deadlock if methods (properties)// of this type are executed concurrently by multiple threads.// Lock objects involved in the cycle: '_resource1', '_resource2'// Example of the deadlock situation:// - Thread #1 executes 'PublicApi01', takes locks '_resource1' -> '_resource2'// - Thread #2 executes 'PublicApi02', takes locks '_resource2' -> '_resource1'lock(_resource1){// do work}}}
note
This deadlock analysis only tracks the relationships between methods and local functions inside a class.
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