What is a fatal error?
A fatal runtime error causes the program to abort and preferably crash with a useful debugging message.
What is a deadlock?
A deadlock is a condition in which two or more threads are blocked forever, each waiting for a lock that the other thread holds. This situation can occur when multiple threads need access to mutually exclusive resources. For example, suppose Thread A has acquired Lock 1 and is waiting to acquire Lock 2. Meanwhile, Thread B has acquired Lock 2 and is waiting to acquire Lock 1. Each thread is blocked, waiting for the other thread to release its lock.
There are two types of deadlocks: hardware and software. Hardware deadlocks can occur when two devices are trying to use the same resource, such as a printer. Software deadlocks can occur when two or more threads are trying to acquire locks on different resources.
How do fatal errors and deadlocks relate to each other?
fatal error all goroutines are asleep deadlock
Fatal errors and deadlocks are two very different things. A fatal error is when a program encounters an unrecoverable error and must terminate. A deadlock is when two or more goroutines are blocked and waiting for each other to unblock, making it impossible for any of them to continue running.
What causes fatal errors and deadlocks?
A fatal error is typically caused by a programming bug, such as an infinite loop or accessing a nil pointer. A deadlock occurs when two or more goroutines are blocked trying to acquire locks and are unable to continue.
How can you prevent fatal errors and deadlocks?
There are two ways to prevent fatal errors and deadlocks from occurring in your code:
- Use the built-in Go race detector to find and fix concurrent races in your code.
- Take care to avoid creating potential deadlocks by ensuring that all goroutines can always make progress.
How can you troubleshoot fatal errors and deadlocks?
If you are experiencing fatal errors or deadlocks, there are a few things you can do to troubleshoot the issue. First, try running your code with the -race flag. This will help you see if there is a race condition in your code. If you see no race condition, then you may have a deadlock. To further troubleshoot a deadlock, you can use the runtime.Stack function to print out the stack trace of all goroutines. This will help you identify which goroutine is causing the deadlock. Finally, you can use the runtime.Gosched function to force a goroutine to yield its time slice. This may help resolve the deadlock by allowing other goroutines to finish running.