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|
# = timeout.rb
#
# execution timeout
#
# = Synopsis
#
# require 'timeout'
# status = Timeout::timeout(5) {
# # Something that should be interrupted if it takes too much time...
# }
#
# = Description
#
# A way of performing a potentially long-running operation in a thread, and terminating
# it's execution if it hasn't finished by a fixed amount of time.
#
# Previous versions of timeout didn't provide use a module for namespace. This version
# provides both Timeout.timeout, and a backwards-compatible #timeout.
#
# = Copyright
#
# Copyright:: (C) 2000 Network Applied Communication Laboratory, Inc.
# Copyright:: (C) 2000 Information-technology Promotion Agency, Japan
module Timeout
# Raised by Timeout#timeout when the block times out.
class Error<Interrupt
end
# Executes the method's block. If the block execution terminates before +sec+
# seconds has passed, it returns true. If not, it terminates the execution
# and raises +exception+ (which defaults to Timeout::Error).
#
# Note that this is both a method of module Timeout, so you can 'include Timeout'
# into your classes so they have a #timeout method, as well as a module method,
# so you can call it directly as Timeout.timeout().
def timeout(sec, exception=Error)
return yield if sec == nil or sec.zero?
begin
x = Thread.current
y = Thread.start {
sleep sec
x.raise exception, "execution expired" if x.alive?
}
yield sec
# return true
ensure
y.kill if y and y.alive?
end
end
module_function :timeout
end
# Identical to:
#
# Timeout::timeout(n, e, &block).
#
# Defined for backwards compatibility with earlier versions of timeout.rb, see
# Timeout#timeout.
def timeout(n, e=Timeout::Error, &block)
Timeout::timeout(n, e, &block)
end
# Another name for Timeout::Error, defined for backwards compatibility with
# earlier versions of timeout.rb.
TimeoutError = Timeout::Error
if __FILE__ == $0
p timeout(5) {
45
}
p timeout(5, TimeoutError) {
45
}
p timeout(nil) {
54
}
p timeout(0) {
54
}
p timeout(5) {
loop {
p 10
sleep 1
}
}
end
|
