What are the different methods for inter-task communication in RTOS?

RTOS provides several mechanisms for tasks to communicate and synchronize. Message queues: FIFO buffer for passing data between tasks. Blocking send/receive with timeouts. Type-safe and copies data. Ideal for producer-consumer patterns. Mailboxes: Single-message queue, often pointer-based. Lighter weight than queues. Event flags/groups: Bit flags for signaling multiple conditions. Tasks wait for any/all combinations. Efficient for status signaling. Direct task notifications (FreeRTOS): Lightweight alternative to semaphores/queues. Single value per task. Fastest method in FreeRTOS. Shared memory: Direct data sharing with mutex protection. Most efficient for large data. Requires careful synchronization. Choice depends on: Data size, number of producers/consumers, timing requirements, and memory constraints. Queues safest but have overhead; shared memory fastest but needs careful design.