Fork#44074: select timeval inaccuracy
Open Date: 2022-03-11 14:17
Last Update: 2022-03-11 14:17
URL for this Ticket:
https://osdn.net//projects/mingw/ticket/44074
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Last Changes/Comment on this Ticket:
2022-03-11 14:17 Updated by: mdblack98
* New Ticket "select timeval inaccuracy" created
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Ticket Status:
Reporter: mdblack98
Owner: (None)
Type: Issues
Status: Open
Priority: 5 - Medium
MileStone: (None)
Component: (None)
Severity: 5 - Medium
Resolution: None
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Ticket details:
I'm the maintainer of Hamlib.
I think this is recent behavior
Even thought the timeval for the select statement is 1 second exactly it ends up being almost 2 seconds.
You can see from the timing on the debug messages that the
2022-03-10T23:15:03.068356-0600: ../../src/src/iofunc.c(721) trace
2022-03-10T23:15:03.068356-0600: port_wait_for_data_direct: sec=1, usec=0
2022-03-10T23:15:05.021620-0600: port_wait_for_data_direct: after port_select
2022-03-10T23:15:05.021620-0600: read_string_generic(): Timed out 1.953 seconds after 0 chars, direct=1
MINGW64_NT-10.0-22000 DESKTOP-VP5ISPC 3.3.3-341.x86_64 2022-01-18 13:00 UTC x86_64 Msys
static int port_wait_for_data_direct(hamlib_port_t *p)
{
fd_set rfds, efds;
int fd = p->fd;
struct timeval tv, tv_timeout;
int result;
TRACE;
tv_timeout.tv_sec = p->timeout / 1000;
tv_timeout.tv_usec = (p->timeout % 1000) * 1000;
rig_debug(RIG_DEBUG_VERBOSE, "%s: sec=%ld, usec=%ld\n", func, tv_timeout.tv_sec, tv_timeout.tv_usec);
tv = tv_timeout; /* select may have updated it */
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
efds = rfds;
result = port_select(p, fd + 1, &rfds, NULL, &efds, &tv, 1);
rig_debug(RIG_DEBUG_VERBOSE, "%s: after port_select\n", func);
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