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place a limit on pipelined queries that can be processed simultaneously

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when the TCPDNS_CLIENTS_PER_CONN limit has been exceeded for a TCP
DNS connection, switch to sequential mode to ensure that memory cannot
be exhausted by too many simultaneous queries.
This commit is contained in:
Evan Hunt
2019-11-08 10:52:49 -08:00
parent 20bb812148
commit 123ee350dc
6 changed files with 235 additions and 88 deletions
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1
lib/ns/client.c
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@@ -2473,7 +2473,6 @@ ns_clientmgr_destroy(ns_clientmgr_t **managerp) {
MTRACE("destroy");
/* XXXWPK TODO we need to pause netmgr here */
/*
* Check for success because we may already be task-exclusive
* at this point. Only if we succeed at obtaining an exclusive