Timeout long-running blocks
Synopsis
require 'timeout' status = Timeout::timeout(5) { # Something that should be interrupted if it takes more than 5 seconds... }
Description
Timeout provides a way to auto-terminate a potentially long-running operation if it hasn’t finished in a fixed amount of time.
Previous versions didn’t use a module for namespacing, however timeout is provided for backwards compatibility. You should prefer Timeout#timeout instead.
Copyright
- Copyright
-
© 2000 Network Applied Communication Laboratory, Inc.
- Copyright
-
© 2000 Information-technology Promotion Agency, Japan
# File tmp/rubies/ruby-2.3.8/lib/timeout.rb, line 73
def timeout(sec, klass = nil) #:yield: +sec+
return yield(sec) if sec == nil or sec.zero?
message = "execution expired".freeze
from = "from #{caller_locations(1, 1)[0]}" if $DEBUG
e = Error
bl = proc do |exception|
begin
x = Thread.current
y = Thread.start {
Thread.current.name = from
begin
sleep sec
rescue => e
x.raise e
else
x.raise exception, message
end
}
return yield(sec)
ensure
if y
y.kill
y.join # make sure y is dead.
end
end
end
if klass
begin
bl.call(klass)
rescue klass => e
bt = e.backtrace
end
else
bt = Error.catch(message, &bl)
end
level = -caller(CALLER_OFFSET).size-2
while THIS_FILE =~ bt[level]
bt.delete_at(level)
end
raise(e, message, bt)
end
Perform an operation in a block, raising an error if it takes longer than sec seconds to complete.
sec-
Number of seconds to wait for the block to terminate. Any number may be used, including Floats to specify fractional seconds. A value of 0 or
nilwill execute the block without any timeout. klass-
ExceptionClassto raise if the block fails to terminate insecseconds. Omitting will use the default,Timeout::Error
Returns the result of the block if the block completed before sec seconds, otherwise throws an exception, based on the value of klass.
The exception thrown to terminate the given block cannot be rescued inside the block unless klass is given explicitly.
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().
# File tmp/rubies/ruby-2.3.8/lib/timeout.rb, line 73
def timeout(sec, klass = nil) #:yield: +sec+
return yield(sec) if sec == nil or sec.zero?
message = "execution expired".freeze
from = "from #{caller_locations(1, 1)[0]}" if $DEBUG
e = Error
bl = proc do |exception|
begin
x = Thread.current
y = Thread.start {
Thread.current.name = from
begin
sleep sec
rescue => e
x.raise e
else
x.raise exception, message
end
}
return yield(sec)
ensure
if y
y.kill
y.join # make sure y is dead.
end
end
end
if klass
begin
bl.call(klass)
rescue klass => e
bt = e.backtrace
end
else
bt = Error.catch(message, &bl)
end
level = -caller(CALLER_OFFSET).size-2
while THIS_FILE =~ bt[level]
bt.delete_at(level)
end
raise(e, message, bt)
end
Perform an operation in a block, raising an error if it takes longer than sec seconds to complete.
sec-
Number of seconds to wait for the block to terminate. Any number may be used, including Floats to specify fractional seconds. A value of 0 or
nilwill execute the block without any timeout. klass-
ExceptionClassto raise if the block fails to terminate insecseconds. Omitting will use the default,Timeout::Error
Returns the result of the block if the block completed before sec seconds, otherwise throws an exception, based on the value of klass.
The exception thrown to terminate the given block cannot be rescued inside the block unless klass is given explicitly.
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().