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Module API for Forking

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* create module API for forking child processes.
* refactor duplicate code around creating and tracking forks by AOF and RDB.
* child processes listen to SIGUSR1 and dies exitFromChild in order to
  eliminate a valgrind warning of unhandled signal.
* note that BGSAVE error reply has changed.

valgrind error is:
  Process terminating with default action of signal 10 (SIGUSR1)
This commit is contained in:
Oran Agra
2019-07-17 08:51:02 +03:00
parent 4b2579a064
commit 56258c6b7d
15 changed files with 342 additions and 91 deletions
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5
src/db.c
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@ -60,10 +60,7 @@ robj *lookupKey(redisDb *db, robj *key, int flags) {
/* Update the access time for the ageing algorithm.
* Don't do it if we have a saving child, as this will trigger
* a copy on write madness. */
if (server.rdb_child_pid == -1 &&
server.aof_child_pid == -1 &&
!(flags & LOOKUP_NOTOUCH))
{
if (!hasForkChild() && !(flags & LOOKUP_NOTOUCH)){
if (server.maxmemory_policy & MAXMEMORY_FLAG_LFU) {
updateLFU(val);
} else {