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patch 8.0.1170: using termdebug results in 100% CPU time

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Problem:    Using termdebug results in 100% CPU time. (tomleb)
Solution:   Use polling instead of select().
This commit is contained in:
Bram Moolenaar
2017-10-01 16:21:31 +02:00
parent 5ece3e359c
commit f33606112a
4 changed files with 71 additions and 15 deletions
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64
src/channel.c
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@@ -3960,6 +3960,8 @@ ch_raw_common(typval_T *argvars, typval_T *rettv, int eval)
free_job_options(&opt);
}
# define KEEP_OPEN_TIME 20 /* msec */
# if (defined(UNIX) && !defined(HAVE_SELECT)) || defined(PROTO)
/*
* Add open channels to the poll struct.
@@ -3967,7 +3969,7 @@ ch_raw_common(typval_T *argvars, typval_T *rettv, int eval)
* The type of "fds" is hidden to avoid problems with the function proto.
*/
int
channel_poll_setup(int nfd_in, void *fds_in)
channel_poll_setup(int nfd_in, void *fds_in, int *towait)
{
int nfd = nfd_in;
channel_T *channel;
@@ -3982,10 +3984,21 @@ channel_poll_setup(int nfd_in, void *fds_in)
if (ch_part->ch_fd != INVALID_FD)
{
ch_part->ch_poll_idx = nfd;
fds[nfd].fd = ch_part->ch_fd;
fds[nfd].events = POLLIN;
nfd++;
if (channel->ch_keep_open)
{
/* For unknown reason poll() returns immediately for a
* keep-open channel. Instead of adding it to the fds add
* a short timeout and check, like polling. */
if (*towait < 0 || *towait > KEEP_OPEN_TIME)
*towait = KEEP_OPEN_TIME;
}
else
{
ch_part->ch_poll_idx = nfd;
fds[nfd].fd = ch_part->ch_fd;
fds[nfd].events = POLLIN;
nfd++;
}
}
else
channel->ch_part[part].ch_poll_idx = -1;
@@ -4021,6 +4034,12 @@ channel_poll_check(int ret_in, void *fds_in)
channel_read(channel, part, "channel_poll_check");
--ret;
}
else if (channel->ch_part[part].ch_fd != INVALID_FD
&& channel->ch_keep_open)
{
/* polling a keep-open channel */
channel_read(channel, part, "channel_poll_check_keep_open");
}
}
in_part = &channel->ch_part[PART_IN];
@@ -4037,11 +4056,17 @@ channel_poll_check(int ret_in, void *fds_in)
# endif /* UNIX && !HAVE_SELECT */
# if (!defined(WIN32) && defined(HAVE_SELECT)) || defined(PROTO)
/*
* The "fd_set" type is hidden to avoid problems with the function proto.
*/
int
channel_select_setup(int maxfd_in, void *rfds_in, void *wfds_in)
channel_select_setup(
int maxfd_in,
void *rfds_in,
void *wfds_in,
struct timeval *tv,
struct timeval **tvp)
{
int maxfd = maxfd_in;
channel_T *channel;
@@ -4057,9 +4082,25 @@ channel_select_setup(int maxfd_in, void *rfds_in, void *wfds_in)
if (fd != INVALID_FD)
{
FD_SET((int)fd, rfds);
if (maxfd < (int)fd)
maxfd = (int)fd;
if (channel->ch_keep_open)
{
/* For unknown reason select() returns immediately for a
* keep-open channel. Instead of adding it to the rfds add
* a short timeout and check, like polling. */
if (*tvp == NULL || tv->tv_sec > 0
|| tv->tv_usec > KEEP_OPEN_TIME * 1000)
{
*tvp = tv;
tv->tv_sec = 0;
tv->tv_usec = KEEP_OPEN_TIME * 1000;
}
}
else
{
FD_SET((int)fd, rfds);
if (maxfd < (int)fd)
maxfd = (int)fd;
}
}
}
}
@@ -4094,6 +4135,11 @@ channel_select_check(int ret_in, void *rfds_in, void *wfds_in)
FD_CLR(fd, rfds);
--ret;
}
else if (fd != INVALID_FD && channel->ch_keep_open)
{
/* polling a keep-open channel */
channel_read(channel, part, "channel_select_check_keep_open");
}
}
in_part = &channel->ch_part[PART_IN];