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patch 7.4.1667

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Problem:    Win32: waiting on a pipe with fixed sleep time.
Solution:   Start with a short delay and increase it when looping.
This commit is contained in:
Bram Moolenaar
2016-03-28 14:20:41 +02:00
parent 46c00a6565
commit 84e1d2b21a
2 changed files with 14 additions and 6 deletions
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18
src/channel.c
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@@ -2371,8 +2371,9 @@ channel_wait(channel_T *channel, sock_T fd, int timeout)
if (fd != channel->CH_SOCK_FD)
{
DWORD nread;
int diff;
int sleep_time;
DWORD deadline = GetTickCount() + timeout;
int delay = 1;
/* reading from a pipe, not a socket */
while (TRUE)
@@ -2380,12 +2381,17 @@ channel_wait(channel_T *channel, sock_T fd, int timeout)
if (PeekNamedPipe((HANDLE)fd, NULL, 0, NULL, &nread, NULL)
&& nread > 0)
return OK;
diff = deadline - GetTickCount();
if (diff <= 0)
sleep_time = deadline - GetTickCount();
if (sleep_time <= 0)
break;
/* Wait for 5 msec.
* TODO: increase the sleep time when looping more often */
Sleep(5);
/* Wait for a little while. Very short at first, up to 10 msec
* after looping a few times. */
if (sleep_time > delay)
sleep_time = delay;
Sleep(sleep_time);
delay = delay * 2;
if (delay > 10)
delay = 10;
}
}
else