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added explanation for the magic 511 backlog number

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This commit is contained in:
Erik Dubbelboer 2012-04-11 17:04:31 +02:00
parent 69e7958918
commit 815c06f2f7
1 changed files with 5 additions and 1 deletions
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6
src/anet.c
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@ -262,7 +262,11 @@ static int anetListen(char *err, int s, struct sockaddr *sa, socklen_t len) {
close(s);
return ANET_ERR;
}
if (listen(s, 511) == -1) { /* the magic 511 constant is from nginx */
/* Use a backlog of 512 entries. We pass 511 to the listen() call because
* the kernel does: backlogsize = roundup_pow_of_two(backlogsize + 1);
* which will thus give us a backlog of 512 entries */
if (listen(s, 511) == -1) {
anetSetError(err, "listen: %s", strerror(errno));
close(s);
return ANET_ERR;