A HarmamyOS developer created three task distributors, serial task dispatcher_a and dispatcher_b, and a proprietary task dispatcher dispatcher_s. The developer is experiencing a deadlock while using syncDispatch, which of the following causes could cause this phenomenon?
Answer(s): A,D
To test the HarmonyOS Bluetooth Low Energy function, a developer uses a central device to call the startScan() interface and scans for a peripheral device. In order for the central device to complete the data exchange with the peripherals, the developer implemented the following development steps.
Answer(s): B,C
A developer uses a task distributor to dispatch tasks 1, 2, and 3. The developer added Task 1 and Task 2 to a task group and used syncDispatchBarrier to set up a task execution barrier on that task group. During execution, the discoverer waits for both task 1 and task 2 to be executed before executing task3. Based on the above scenario analysis, which of the following task distributors may be used by the developer?
Answer(s): A,B,D
A HarmonyOS developer uses the EventHandler mechanism to handle four events: A, B, C, and D, where event D retains the default priority, and the priority properties of the other three events are set as follows:Event A: Priority.IMMEDIATEEvent B: Priority.HIGHEvent C: Priority.IDLEWhich of the following accounts of the above events is correct?
Answer(s): A,C,D
In order to control the access of a specific interface to the caller, an application confirms that the visitor has the required permissions through verifyCallingPermission. Which of the following descriptions is correct?
Answer(s): B,D
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