


Can a Caller Function Recover from a Child Goroutine\'s Panic in Go?
How Does a Caller Function Recover from Child Goroutine's Panics?
Previously, it was assumed that a panic in a goroutine would terminate the program if its caller completed before the panic occurred. However, experimenting with a sample code revealed otherwise.
Sample Code:
<code class="go">func fun1() { fmt.Println("fun1 started") defer func() { if err := recover(); err != nil { fmt.Println("recover in func1") } }() go fun2() time.Sleep(10 * time.Second) // wait for the boom! fmt.Println("fun1 ended") } func fun2() { fmt.Println("fun2 started") time.Sleep(5 * time.Second) panic("fun2 booom!") fmt.Println("fun2 ended") }</code>
Unexpected Behavior:
Despite the expectation that the caller function's recovery mechanism would handle the goroutine's panic, the entire program still terminated.
Explanation:
The Go specification states that:
When fun2 is the top-level function executing in the goroutine and fun2 does not recover from a panic, the program terminates when fun2 panics.
Since fun2 is the top-level function in its goroutine and it does not handle the panic, the program terminates prematurely.
Goroutine Autonomy:
A goroutine cannot recover from a panic in another goroutine. Therefore, the deferred call in fun1 is not invoked when fun2 panics.
Conclusion:
A caller function cannot recover from panics in goroutines it creates unless the goroutine explicitly recovers from the panic before the program caller terminates.
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