Use the syscall package in Go to perform low-level OS operations like file locking with syscall.Flock.
Use the syscall package to invoke low-level operating system functions like file locking or stat operations directly. For example, serialize access to a resource by acquiring an exclusive file lock:
lock, _ := os.OpenFile("/tmp/lock", os.O_CREATE|os.O_RDWR, 0666)
syscall.Flock(int(lock.Fd()), syscall.LOCK_EX)
This blocks until the lock is acquired, preventing concurrent execution.
The syscall package lets your Go program talk directly to the operating system for tasks the standard library doesn't handle, like locking files to prevent crashes. Think of it as using a physical key to lock a door so only one person can enter at a time, ensuring safety when multiple processes try to access the same resource.