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Rework the calculation of the select timeout in io() to be based on absolute wake time

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An absolute wake time is now calculated and updated by set_server_bits(),
TimerTimeout() and tclTimerTimeout().  This is then used to calculate the actual
select() timeout, instead of having those functions calculate a relative timeout
value themselves.  This significantly simplifies those functions, since the
underlying values tend to be recorded as absolute times.

It also allows us to disentangle tclTimeTimeout from TimerTimeout(), and move the
responsibility for calculating the QUEUE_SENDS wake time from TimerTimeout() to
set_server_bits() where it belongs.

The QUEUE_SENDS and CONNECT_DELAY wake up times will also now be correctly
calculated, based on the last sent time and connect time respectively.
This commit is contained in:
Kevin Easton
2015-06-07 00:03:09 +10:00
parent 6f0f9dd8a8
commit c0c7cdbdcc
7 changed files with 67 additions and 99 deletions
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27
source/server.c
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@@ -227,19 +227,19 @@ void close_unattached_servers(void)
* set_server_bits: Sets the proper bits in the fd_set structure according to
* which servers in the server list have currently active read descriptors.
*/
long set_server_bits (fd_set *rd, fd_set *wr)
void set_server_bits (fd_set *rd, fd_set *wr, struct timeval *wake_time)
{
int i;
long timeout = -1;
for (i = 0; i < number_of_servers; i++)
{
if (server_list[i].reconnect > 0)
{
/* CONNECT_DELAY is in seconds but we must
* return in milliseconds.
*/
timeout = get_int_var(CONNECT_DELAY_VAR)*1000;
struct timeval connect_wake_time = server_list[i].connect_time;
connect_wake_time.tv_sec += get_int_var(CONNECT_DELAY_VAR);
if (time_cmp(wake_time, &connect_wake_time) > 0)
*wake_time = connect_wake_time;
}
if (server_list[i].read > -1)
@@ -250,9 +250,20 @@ long set_server_bits (fd_set *rd, fd_set *wr)
FD_SET(server_list[i].write, wr);
#endif
}
return timeout;
}
/* Check for a QUEUE_SENDS wake_time */
if (serverqueue)
{
struct timeval queue_wake_time;
queue_wake_time.tv_sec = server_list[serverqueue->server].last_sent +
get_int_var(QUEUE_SENDS_VAR);
queue_wake_time.tv_usec = 0;
if (time_cmp(wake_time, &queue_wake_time) > 0)
*wake_time = queue_wake_time;
}
}
int timed_server (void *args, char *sub)
{