otp.git - Mirror of Erlang/OTP repository.

Age	Commit message (Collapse)	Author
2017-11-09	[supervisor] Improve test suite before refactoring	Siri Hansen

2016-02-03	Speed up supervisor:count_children/1; simple_one_for_one	Rory Byrne
	Speed up supervisor:count_children/1 for simple_one_for_one supervisors. This is achieved by avoiding looping through all the child process and verifying that each one is alive. For a supervisor with 100,000 'temporary' children the count-time will drop from approx 25ms to about 0.005ms. For a supervisor with 100,000 'permanent' or 'transient' children the count-time will drop from approx 30ms to about 0.005ms. This avoids having the supervisor block for an extended period while the count takes place. Under normal circumstances the accuracy of the result should also improve since the duration is too short for many processes to die during the count.
2012-03-05	Leave control back to gen_server during supervisor's restart loop	Siri Hansen
	When an attempt to restart a child failed, supervisor would earlier keep the execution flow and try to restart the child over and over again until it either succeeded or the restart frequency limit was reached. If none of these happened, supervisor would hang forever in this loop. This commit adds a timer of 0 ms where the control is left back to the gen_server which implements the supervisor. This way any incoming request to the supervisor will be handled - which could help breaking the infinite loop - e.g. shutdown request for the supervisor or for the problematic child. This introduces some incompatibilities in stdlib due to new return values from supervisor: * restart_child/2 can now return {error,restarting} * delete_child/2 can now return {error,restarting} * which_children/1 returns a list of {Id,Child,Type,Mods}, where Child, in addition to the old pid() or 'undefined', now also can be 'restarting'.