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class ConnectionPool
if Process.respond_to?(:fork)
INSTANCES = ObjectSpace::WeakMap.new
private_constant :INSTANCES
def self.after_fork
INSTANCES.each_value do |pool|
# We're in after_fork, so we know all other threads are dead.
# All we need to do is ensure the main thread doesn't have a
# checked out connection
pool.checkin(force: true)
pool.reload do |connection|
# Unfortunately we don't know what method to call to close the connection,
# so we try the most common one.
connection.close if connection.respond_to?(:close)
end
end
nil
end
module ForkTracker
def _fork
pid = super
if pid == 0
ConnectionPool.after_fork
end
pid
end
end
Process.singleton_class.prepend(ForkTracker)
else
# JRuby, et al
INSTANCES = nil
private_constant :INSTANCES
def self.after_fork
# noop
end
end
end
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