database/postgres
1
0
Fork 0
mirror of https://github.com/postgres/postgres.git synced 2025-11-21 00:42:43 +03:00
Code Activity

Refactor ListenSocket array.

Browse Source 
Keep track of the used size of the array. That avoids looping through
the whole array in a few places. It doesn't matter from a performance
point of view since the array is small anyway, but this feels less
surprising and is a little less code. Now that we have an explicit
NumListenSockets variable that is statically initialized to 0, we
don't need the loop to initialize the array.

Allocate the array in PostmasterContext. The array isn't needed in
child processes, so this allows reusing that memory. We could easily
make the array resizable now, but we haven't heard any complaints
about the current 64 sockets limit.

Discussion: https://www.postgresql.org/message-id/7bb7ad65-a018-2419-742f-fa5fd877d338@iki.fi
This commit is contained in:
Heikki Linnakangas
2023-10-05 15:05:25 +03:00
parent 1c99cde2f3
commit e29c464395
3 changed files with 40 additions and 61 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
src/backend/libpq/pqcomm.c
View File

@@ -311,16 +311,17 @@ socket_close(int code, Datum arg)
* specified. For TCP ports, hostName is either NULL for all interfaces or
* the interface to listen on, and unixSocketDir is ignored (can be NULL).
*
* Successfully opened sockets are added to the ListenSocket[] array (of
* length MaxListen), at the first position that isn't PGINVALID_SOCKET.
* Successfully opened sockets are appended to the ListenSockets[] array. On
* entry, *NumListenSockets holds the number of elements currently in the
* array, and it is updated to reflect the opened sockets. MaxListen is the
* allocated size of the array.
*
* RETURNS: STATUS_OK or STATUS_ERROR
*/
int
StreamServerPort(int family, const char *hostName, unsigned short portNumber,
const char *unixSocketDir,
pgsocket ListenSocket[], int MaxListen)
pgsocket ListenSockets[], int *NumListenSockets, int MaxListen)
{
pgsocket fd;
int err;
@@ -335,7 +336,6 @@ StreamServerPort(int family, const char *hostName, unsigned short portNumber,
struct addrinfo *addrs = NULL,
*addr;
struct addrinfo hint;
int listen_index = 0;
int added = 0;
char unixSocketPath[MAXPGPATH];
#if !defined(WIN32) || defined(IPV6_V6ONLY)
@@ -401,12 +401,7 @@ StreamServerPort(int family, const char *hostName, unsigned short portNumber,
}
/* See if there is still room to add 1 more socket. */
for (; listen_index < MaxListen; listen_index++)
{
if (ListenSocket[listen_index] == PGINVALID_SOCKET)
break;
}
if (listen_index >= MaxListen)
if (*NumListenSockets == MaxListen)
{
ereport(LOG,
(errmsg("could not bind to all requested addresses: MAXLISTEN (%d) exceeded",
@@ -573,7 +568,8 @@ StreamServerPort(int family, const char *hostName, unsigned short portNumber,
(errmsg("listening on %s address \"%s\", port %d",
familyDesc, addrDesc, (int) portNumber)));
ListenSocket[listen_index] = fd;
ListenSockets[*NumListenSockets] = fd;
(*NumListenSockets)++;
added++;
}