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netmgr: make tcp listening multithreaded.

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When listening for TCP connections we create a socket, bind it
and then pass it over IPC to all threads - which then listen on
in and accept connections. This sounds broken, but it's the
official way of dealing with multithreaded TCP listeners in libuv,
and works on all platforms supported by libuv.
This commit is contained in:
Witold Kręcicki
2019-11-28 10:21:34 +01:00
committed by Evan Hunt
parent 09c2dbffb5
commit bc5aae1579
4 changed files with 325 additions and 27 deletions
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22
lib/isc/netmgr/netmgr.c
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@@ -42,6 +42,12 @@
ISC_THREAD_LOCAL int isc__nm_tid_v = ISC_NETMGR_TID_UNKNOWN;
#ifdef WIN32
#define NAMED_PIPE_PREFIX "\\\\.\\pipe\\named-ipc"
#else
#define NAMED_PIPE_PREFIX ".named-ipc"
#endif
static void
nmsocket_maybe_destroy(isc_nmsocket_t *sock);
static void
@@ -497,6 +503,9 @@ async_cb(uv_async_t *handle) {
case netievent_tcplisten:
isc__nm_async_tcplisten(worker, ievent);
break;
case netievent_tcpchildlisten:
isc__nm_async_tcpchildlisten(worker, ievent);
break;
case netievent_tcpstartread:
isc__nm_async_startread(worker, ievent);
break;
@@ -509,6 +518,9 @@ async_cb(uv_async_t *handle) {
case netievent_tcpstoplisten:
isc__nm_async_tcpstoplisten(worker, ievent);
break;
case netievent_tcpstopchildlisten:
isc__nm_async_tcpstopchildlisten(worker, ievent);
break;
case netievent_tcpclose:
isc__nm_async_tcpclose(worker, ievent);
break;
@@ -790,6 +802,16 @@ isc__nmsocket_init(isc_nmsocket_t *sock, isc_nm_t *mgr,
sock->ah_handles[i] = NULL;
}
/*
* XXXWPK Maybe it should be in tmp, maybe it should not
* be random?
*/
strcpy(sock->ipc_pipe_name, NAMED_PIPE_PREFIX);
for (int i=strlen(sock->ipc_pipe_name); i<31; i++) {
sock->ipc_pipe_name[i] = isc_random8()%24 + 'a';
}
sock->ipc_pipe_name[31] = '\0';
isc_mutex_init(&sock->lock);
isc_condition_init(&sock->cond);
isc_refcount_init(&sock->references, 1);