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ntp: wait for late HW TX timestamps

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When sending client requests to a close and fast server, it is possible
that a response will be received before the HW transmit timestamp of
the request itself. To avoid processing of the response without the HW
timestamp, monitor events returned by select() and suspend reading of
packets from the receive queue for up to 200 microseconds. As the
requests are normally separated by at least 200 milliseconds, it is
sufficient to monitor and suspend one socket at a time.
This commit is contained in:
Miroslav Lichvar
2018-02-02 11:29:23 +01:00
parent 4ddadd5622
commit b1647dbcb7
3 changed files with 116 additions and 0 deletions
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4
ntp_io_linux.h
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@@ -33,9 +33,13 @@ extern void NIO_Linux_Finalise(void);
extern int NIO_Linux_SetTimestampSocketOptions(int sock_fd, int client_only, int *events);
extern int NIO_Linux_ProcessEvent(int sock_fd, int event);
extern int NIO_Linux_ProcessMessage(NTP_Remote_Address *remote_addr, NTP_Local_Address *local_addr,
NTP_Local_Timestamp *local_ts, struct msghdr *hdr, int length);
extern int NIO_Linux_RequestTxTimestamp(struct msghdr *msg, int cmsglen, int sock_fd);
extern void NIO_Linux_NotifySocketClosing(int sock_fd);
#endif