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TCP: add manual read timer control mode

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This commit adds a manual read timer control mode to the TCP
code (adding isc__nmhandle_set_manual_timer() as the interface to it).

Manual read timer control mode suppresses read timer restarting the
read timer when receiving any amount of data. This way the read timer
can be controlled manually using:

* isc__nmsocket_timer_start();
* isc__nmsocket_timer_stop();
* isc__nmsocket_timer_restart().

The change is required to make it possible to implement more
sophisticated read timer control policies in DNS transports, built on
top of TCP.
This commit is contained in:
Artem Boldariev
2022-10-18 15:21:10 +03:00
parent f4760358f8
commit 9aabd55725
3 changed files with 49 additions and 2 deletions
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11
lib/isc/netmgr/netmgr-int.h
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@@ -1062,6 +1062,7 @@ struct isc_nmsocket {
atomic_int_fast32_t active_child_connections;
bool barrier_initialised;
bool manual_read_timer;
#ifdef NETMGR_TRACE
void *backtrace[TRACE_SIZE];
int backtrace_size;
@@ -1354,6 +1355,9 @@ isc__nm_tcp_settimeout(isc_nmhandle_t *handle, uint32_t timeout);
* Set the read timeout for the TCP socket associated with 'handle'.
*/
void
isc__nmhandle_tcp_set_manual_timer(isc_nmhandle_t *handle, const bool manual);
void
isc__nm_async_tcplisten(isc__networker_t *worker, isc__netievent_t *ev0);
void
@@ -2008,3 +2012,10 @@ isc__nmsocket_log(const isc_nmsocket_t *sock, int level, const char *fmt, ...)
void
isc__nmhandle_log(const isc_nmhandle_t *handle, int level, const char *fmt, ...)
ISC_FORMAT_PRINTF(3, 4);
void
isc__nmhandle_set_manual_timer(isc_nmhandle_t *handle, const bool manual);
/*
* Set manual read timer control mode - so that it will not get reset
* automatically on read nor get started when read is initiated.
*/