本文整理汇总了C++中Alarm::SetAlarm方法的典型用法代码示例。如果您正苦于以下问题：C++ Alarm::SetAlarm方法的具体用法？C++ Alarm::SetAlarm怎么用？C++ Alarm::SetAlarm使用的例子？那么, 这里精选的方法代码示例或许可以为您提供帮助。您也可以进一步了解该方法所在类Alarm的用法示例。
在下文中一共展示了Alarm::SetAlarm方法的1个代码示例，这些例子默认根据受欢迎程度排序。您可以为喜欢或者感觉有用的代码点赞，您的评价将有助于系统推荐出更棒的C++代码示例。
示例1: net_read_with_timeout
/* This does a blocking read for size amount of bytes. However, there is
a timeout associated with it. This function is closely allied in
implementation with _condor_full_read, but due to the alarm signal
hilarity, it gets its own implementation here. The logic of this
is a bit screwed up, but I had to fit it within the mindset of the
ckpt server codebase, which is odd. The reason the logic is
screwed up is because it is problematic to discover if the function
failed due to timeout, or a different reason.
*/
read_result_t net_read_with_timeout(int fd, char *ptr, size_t nbytes,
size_t *numread, int timeout)
{
int nleft, nread;
MyString log_msg;
int save_errno;
/* we use signal to implement breaking out of a permanently blocked
or very slow read situation */
rt_alarm.SetAlarm(timeout);
nleft = nbytes;
while (nleft > 0) {
REISSUE_READ:
nread = read(fd, ptr, nleft);
if (nread < 0) {
save_errno = errno;
if (errno == EINTR) {
/* If the alarm is expired (we'll know because the SIGALARM
handler tells the global rt_alarm object it is expired),
then we timed out on the connection, otherwise
ignore whatever signal it was and reissue the read.
*/
if (rt_alarm.IsExpired() == true) {
rt_alarm.ResetAlarm();
/* of course, we really don't know exactly how much we
read, but that's ok, since we're closing the connection
very soon at any rate. */
*numread = (nbytes - nleft);
return NET_READ_TIMEOUT;
}
/* However, if it was some other kind of signal instead of
the alarm, we'll be generous and resubmit the read with
the same timeout again. This does make it possible for
the timeout to never fire of the right frequency of non
alarm signals happens, but this checkpoint server code
is horrible and probably going away very soon. So we'll
soak that small chance. */
rt_alarm.SetAlarm(timeout);
goto REISSUE_READ;
}
/* The caller has no idea how much was actually read in this
scenario, but we know we aren't going to be reading anymore.
*/
rt_alarm.ResetAlarm();
errno = save_errno;
/* This represents confirmed bytes read, more could have been
read off of the socket, however, and lost by the kernel when
the error occured. */
*numread = (nbytes - nleft);
return NET_READ_FAIL;
} else if (nread == 0) {
/* We've reached the end of file marker, so stop looping. */
break;
}
/* update counters */
nleft -= nread;
ptr = ((char *)ptr) + nread;
}
rt_alarm.ResetAlarm();
/* return how much was actually read, which could include 0 in an
EOF situation */
*numread = (nbytes - nleft);
return NET_READ_OK;
}