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Remove pg_dump/parallel.c's useless "aborting" flag.

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This was effectively dead code, since the places that tested it could not
be reached after we entered the on-exit-cleanup routine that would set it.
It seems to have been a leftover from a design in which error abort would
try to send fresh commands to the workers --- a design which could never
have worked reliably, of course.  Since the flag is not cross-platform, it
complicates reasoning about the code's behavior, which we could do without.

Although this is effectively just cosmetic, back-patch anyway, because
there are some actual bugs in the vicinity of this behavior.

Discussion: <15583.1464462418@sss.pgh.pa.us>
This commit is contained in:
Tom Lane
2016-05-29 13:00:09 -04:00
parent da0ab74d16
commit 2ee6bf59e5
1 changed files with 6 additions and 28 deletions
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34
src/bin/pg_dump/parallel.c
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@ -95,11 +95,7 @@ static int piperead(int s, char *buf, int len);
#else /* !WIN32 */
/*
* Variables for handling signals. aborting is only ever used in the master,
* the workers just need wantAbort.
*/
static bool aborting = false;
/* Signal handler flag */
static volatile sig_atomic_t wantAbort = 0;
/* Non-Windows implementation of pipe access */
@ -301,14 +297,6 @@ archive_close_connection(int code, void *arg)
if (si->AHX)
DisconnectDatabase(si->AHX);
#ifndef WIN32
/*
* Setting aborting to true shuts off error/warning messages that
* are no longer useful once we start killing workers.
*/
aborting = true;
#endif
ShutdownWorkersHard(si->pstate);
}
else
@ -1180,11 +1168,9 @@ select_loop(int maxFd, fd_set *workerset)
/*
* If we Ctrl-C the master process, it's likely that we interrupt
* select() here. The signal handler will set wantAbort == true and
* the shutdown journey starts from here. Note that we'll come back
* here later when we tell all workers to terminate and read their
* responses. But then we have aborting set to true.
* the shutdown journey starts from here.
*/
if (wantAbort && !aborting)
if (wantAbort)
exit_horribly(modulename, "terminated by user\n");
if (i < 0 && errno == EINTR)
@ -1281,17 +1267,9 @@ sendMessageToWorker(ParallelState *pstate, int worker, const char *str)
if (pipewrite(pstate->parallelSlot[worker].pipeWrite, str, len) != len)
{
/*
* If we're already aborting anyway, don't care if we succeed or not.
* The child might have gone already. (XXX but if we're aborting
* already, why are we here at all?)
*/
#ifndef WIN32
if (!aborting)
#endif
exit_horribly(modulename,
"could not write to the communication channel: %s\n",
strerror(errno));
exit_horribly(modulename,
"could not write to the communication channel: %s\n",
strerror(errno));
}
}