Can the synchronized keyword be used inside suspend functions to manage threads?

The synchronized keyword in Kotlin is used to synchronize access to critical sections of code and is applied to regular functions or code blocks. It cannot be used directly in suspend functions because suspend functions can be paused and resumed, whereas synchronized works at the thread level and blocks the thread.

To manage concurrent access within suspend functions in Kotlin, it is recommended to use coroutine synchronization mechanisms such as:

• Mutex from kotlinx.coroutines.sync — provides non-blocking locking for coroutines.
• Semaphore — to limit the number of coroutines executing simultaneously.

Example of using Mutex:

val mutex = Mutex()

suspend fun criticalSection() {
    mutex.withLock {
        // critical section
    }
}

Thus, synchronized is not suitable for suspend functions; instead, coroutine primitives are used for synchronization.