Package atexit implements support for running deferred functions in case of
abnormal exit (in contrast to a normal exit when the program returns from
the main function).
Since calling os.Exit, e.g. during a signal handler, does not call deferred
functions, a complementary mechanism is required when the program acquires
resources that are not automatically released by the operating system at
program termination, e.g. SYSV shared memory.
atexit is designed to work with, and complement, Go standard deferred
mechanism. The Exit function provided by this package must be used, in order
to run registered deferred functions.
The Exit function SHOULD only be called in case of abnormal program
termination.
The idiomatic use of atexit is:
AcquireResource(...)
// ...
defer atexit.Do(func() {
ReleaseResource(...)
})()ReleaseResource will be called by the runtime deferred mechanism in case of
normal program termination, but will be called by atexit when atexit.Exit
is called during an abnormal program termination (e.g. after having received a
signal), but only if they have not been already be called by the Go runtime.