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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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16
lib/isc/netmgr/netmgr-int.h
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@@ -114,7 +114,9 @@ typedef enum isc__netievent_type {
netievent_tcpstartread,
netievent_tcppauseread,
netievent_tcplisten,
netievent_tcpchildlisten,
netievent_tcpstoplisten,
netievent_tcpstopchildlisten,
netievent_tcpclose,
netievent_closecb,
netievent_shutdown,
@@ -159,6 +161,7 @@ typedef struct isc__nm_uvreq {
isc_sockaddr_t peer; /* peer address */
isc__nm_cb_t cb; /* callback */
void * cbarg; /* callback argument */
uv_pipe_t pipe;
union {
uv_req_t req;
uv_getaddrinfo_t getaddrinfo;
@@ -180,6 +183,7 @@ typedef struct isc__netievent__socket {
typedef isc__netievent__socket_t isc__netievent_udplisten_t;
typedef isc__netievent__socket_t isc__netievent_udpstoplisten_t;
typedef isc__netievent__socket_t isc__netievent_tcpstoplisten_t;
typedef isc__netievent__socket_t isc__netievent_tcpstopchildlisten_t;
typedef isc__netievent__socket_t isc__netievent_tcpclose_t;
typedef isc__netievent__socket_t isc__netievent_startread_t;
typedef isc__netievent__socket_t isc__netievent_pauseread_t;
@@ -193,6 +197,7 @@ typedef struct isc__netievent__socket_req {
typedef isc__netievent__socket_req_t isc__netievent_tcpconnect_t;
typedef isc__netievent__socket_req_t isc__netievent_tcplisten_t;
typedef isc__netievent__socket_req_t isc__netievent_tcpchildlisten_t;
typedef isc__netievent__socket_req_t isc__netievent_tcpsend_t;
typedef struct isc__netievent_udpsend {
@@ -274,6 +279,7 @@ typedef enum isc_nmsocket_type {
isc_nm_udplistener, /* Aggregate of nm_udpsocks */
isc_nm_tcpsocket,
isc_nm_tcplistener,
isc_nm_tcpchildlistener,
isc_nm_tcpdnslistener,
isc_nm_tcpdnssocket
} isc_nmsocket_type;
@@ -322,6 +328,11 @@ struct isc_nmsocket {
isc_nmiface_t *iface;
isc_nmhandle_t *tcphandle;
/* used to send listening TCP sockets to children */
uv_pipe_t ipc;
char ipc_pipe_name[32];
atomic_int_fast32_t schildren;
/*% extra data allocated at the end of each isc_nmhandle_t */
size_t extrahandlesize;
@@ -579,9 +590,14 @@ isc__nm_async_tcpconnect(isc__networker_t *worker, isc__netievent_t *ievent0);
void
isc__nm_async_tcplisten(isc__networker_t *worker, isc__netievent_t *ievent0);
void
isc__nm_async_tcpchildlisten(isc__networker_t *worker, isc__netievent_t *ievent0);
void
isc__nm_async_tcpstoplisten(isc__networker_t *worker,
isc__netievent_t *ievent0);
void
isc__nm_async_tcpstopchildlisten(isc__networker_t *worker,
isc__netievent_t *ievent0);
void
isc__nm_async_tcpsend(isc__networker_t *worker, isc__netievent_t *ievent0);
void
isc__nm_async_startread(isc__networker_t *worker, isc__netievent_t *ievent0);