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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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6
src/replication.c
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@ -751,11 +751,11 @@ void syncCommand(client *c) {
/* Target is disk (or the slave is not capable of supporting
* diskless replication) and we don't have a BGSAVE in progress,
* let's start one. */
if (server.aof_child_pid == -1) {
if (!hasForkChild()) {
startBgsaveForReplication(c->slave_capa);
} else {
serverLog(LL_NOTICE,
"No BGSAVE in progress, but an AOF rewrite is active. "
"No BGSAVE in progress, but another BG operation is active. "
"BGSAVE for replication delayed");
}
}
@ -2899,7 +2899,7 @@ void replicationCron(void) {
* In case of diskless replication, we make sure to wait the specified
* number of seconds (according to configuration) so that other slaves
* have the time to arrive before we start streaming. */
if (server.rdb_child_pid == -1 && server.aof_child_pid == -1) {
if (!hasForkChild()) {
time_t idle, max_idle = 0;
int slaves_waiting = 0;
int mincapa = -1;