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Merge pull request#10 from CherkashinSergey/fix_segfault

Fix bug related with queries to dead backends

2 parentsb7d5f98 +91e3196 commit1cb4967Copy full SHA for 1cb4967

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pg_query_state.c

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`‎pg_query_state.c`

Lines changed: 17 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -618,6 +618,11 @@ pg_query_state(PG_FUNCTION_ARGS)`
`618`	`618`	`shm_mq_msgmsg= (shm_mq_msg)lfirst(i);`
`619`	`619`	`proc_statep_state= (proc_state)palloc(sizeof(proc_state));`
`620`	`620`
	`621`	`+if (msg->result_code!=QS_RETURNED)`
	`622`	`+continue;`
	`623`	`+`
	`624`	`+AssertState(msg->result_code==QS_RETURNED);`
	`625`	`+`
`621`	`626`	`qs_stack=deserialize_stack(msg->stack,msg->stack_depth);`
`622`	`627`
`623`	`628`	`p_state->proc=msg->proc;`
`@@ -856,7 +861,12 @@ SendBgWorkerPids(void)`
`856`	`861`	`msg->number=list_length(all_workers);`
`857`	`862`	`i=0;`
`858`	`863`	`foreach(iter,all_workers)`
`859`		`-msg->pids[i++]=lfirst_int(iter);`
	`864`	`+{`
	`865`	`+pid_tcurrent_pid=lfirst_int(iter);`
	`866`	`+`
	`867`	`+AssertState(current_pid>0);`
	`868`	`+msg->pids[i++]=current_pid;`
	`869`	`+}`
`860`	`870`
`861`	`871`	`shm_mq_send(mqh,msg_len,msg, false);`
`862`	`872`	`}`
`@@ -894,9 +904,10 @@ GetRemoteBackendWorkers(PGPROC *proc)`
`894`	`904`
`895`	`905`	`for (i=0;i<msg->number;i++)`
`896`	`906`	`{`
`897`		`-pid_tpid=msg->pids[i];`
`898`		`-PGPROC*proc=BackendPidGetProc(pid);`
`899`		`-`
	`907`	`+pid_tpid=msg->pids[i];`
	`908`	`+PGPROC*proc=BackendPidGetProc(pid);`
	`909`	`+if (!proc\|\| !proc->pid)`
	`910`	`+continue;`
`900`	`911`	`result=lcons(proc,result);`
`901`	`912`	`}`
`902`	`913`
`@@ -971,7 +982,8 @@ GetRemoteBackendQueryStates(PGPROC *leader,`
`971`	`982`	`foreach(iter,pworkers)`
`972`	`983`	`{`
`973`	`984`	`PGPROCproc= (PGPROC)lfirst(iter);`
`974`		`-`
	`985`	`+if (!proc\|\| !proc->pid)`
	`986`	`+continue;`
`975`	`987`	`sig_result=SendProcSignal(proc->pid,`
`976`	`988`	`QueryStatePollReason,`
`977`	`989`	`proc->backendId);`

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`‎pg_query_state.c`

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