Code review for concurrent systems

1package main
2
3import (
4    "fmt"
5    "sync"
6)
7
8type BankAccount struct {
9    mu      sync.Mutex
10    balance int
11}
12
13func (a *BankAccount) Deposit(amount int) {
14    a.mu.Lock()
15    defer a.mu.Unlock()
16    a.balance += amount
17}
18
19func (a *BankAccount) Withdraw(amount int) bool {
20    a.mu.Lock()
21    defer a.mu.Unlock()
22    if a.balance >= amount {
23        a.balance -= amount
24        return true
25    }
26    return false
27}
28
29func (a *BankAccount) Transfer(to *BankAccount, amount int) {
30    a.mu.Lock()
31    defer a.mu.Unlock()
32    to.mu.Lock()
33    defer to.mu.Unlock()
34    if a.balance >= amount {
35        a.balance -= amount
36        to.balance += amount
37    }
38}