diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/gen_server2.erl | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/src/gen_server2.erl b/src/gen_server2.erl index 253c2eb18c..87b56ba38e 100644 --- a/src/gen_server2.erl +++ b/src/gen_server2.erl @@ -52,13 +52,17 @@ %% which it then realises it is not interested in. When this happens, %% handle_info(roused_and_disinterested, State) will be called as soon %% as there are no further messages to process (i.e. upon waking, the -%% message queue is drained, and a timeout of 0 is used). A suggested -%% use of this is to cater for low priority background casts, which -%% can be sent with negative priorities, and to use a priority of 0 or -%% higher for everything else. Then, if you return from handle_* with -%% a timeout of 0 and find handle_info(timeout, State) being called, -%% you can then return with a min_priority of 'any' and pick up the -%% low priority messages. +%% message queue is drained, and a timeout of 0 is used). +%% +%% This feature means that you can delay processing lower priority +%% messages. For example, when a min_priority of 0 is combined with +%% the binary backoff timeout, you can delay processing any +%% negative-priority messages until the first timeout fires which +%% indicates that, given a steady state, the process has been idle for +%% sufficiently long that it's reasonable to expect it to be +%% uninterrupted by higher-priority messages for some little while; +%% thus preventing low-priority, but lengthy jobs from getting in the +%% way of higher priority jobs that need quick responses. %% All modifications are (C) 2009 LShift Ltd. |