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Use std::vector in event-loop.cc

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In my occasional and continuing campaign against realloc, this patch
changes event-loop.cc to use std::vector to keep track of pollfd
objects.  Regression tested on x86-64 Fedora 38.

Approved-By: Simon Marchi <simon.marchi@efficios.com>
Approved-By: John Baldwin <jhb@FreeBSD.org>
This commit is contained in:
Tom Tromey 2024-04-06 12:37:37 -06:00
parent b5247082c4
commit 1f984aabf1
1 changed files with 18 additions and 39 deletions
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57
gdbsupport/event-loop.cc
View File

@ -112,8 +112,8 @@ static struct
file_handler *next_file_handler;
#ifdef HAVE_POLL
/* Ptr to array of pollfd structures. */
struct pollfd *poll_fds;
/* Descriptors to poll. */
std::vector<struct pollfd> poll_fds;
/* Next file descriptor to handle, for the poll variant. To level
the fairness across event sources, we poll the file descriptors
@ -336,17 +336,11 @@ create_file_handler (int fd, int mask, handler_func * proc,
if (use_poll)
{
gdb_notifier.num_fds++;
if (gdb_notifier.poll_fds)
gdb_notifier.poll_fds =
(struct pollfd *) xrealloc (gdb_notifier.poll_fds,
(gdb_notifier.num_fds
* sizeof (struct pollfd)));
else
gdb_notifier.poll_fds =
XNEW (struct pollfd);
(gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->fd = fd;
(gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->events = mask;
(gdb_notifier.poll_fds + gdb_notifier.num_fds - 1)->revents = 0;
struct pollfd new_fd;
new_fd.fd = fd;
new_fd.events = mask;
new_fd.revents = 0;
gdb_notifier.poll_fds.push_back (new_fd);
}
else
#endif /* HAVE_POLL */
@ -426,28 +420,13 @@ delete_file_handler (int fd)
#ifdef HAVE_POLL
if (use_poll)
{
int j;
struct pollfd *new_poll_fds;
/* Create a new poll_fds array by copying every fd's information
but the one we want to get rid of. */
new_poll_fds = (struct pollfd *)
xmalloc ((gdb_notifier.num_fds - 1) * sizeof (struct pollfd));
for (i = 0, j = 0; i < gdb_notifier.num_fds; i++)
{
if ((gdb_notifier.poll_fds + i)->fd != fd)
{
(new_poll_fds + j)->fd = (gdb_notifier.poll_fds + i)->fd;
(new_poll_fds + j)->events = (gdb_notifier.poll_fds + i)->events;
(new_poll_fds + j)->revents
= (gdb_notifier.poll_fds + i)->revents;
j++;
}
}
xfree (gdb_notifier.poll_fds);
gdb_notifier.poll_fds = new_poll_fds;
auto iter = std::remove_if (gdb_notifier.poll_fds.begin (),
gdb_notifier.poll_fds.end (),
[=] (const pollfd &item)
{
return item.fd == fd;
});
gdb_notifier.poll_fds.erase (iter, gdb_notifier.poll_fds.end());
gdb_notifier.num_fds--;
}
else
@ -605,7 +584,7 @@ gdb_wait_for_event (int block)
else
timeout = 0;
num_found = poll (gdb_notifier.poll_fds,
num_found = poll (gdb_notifier.poll_fds.data (),
(unsigned long) gdb_notifier.num_fds, timeout);
/* Don't print anything if we get out of poll because of a
@ -676,7 +655,7 @@ gdb_wait_for_event (int block)
i = gdb_notifier.next_poll_fds_index++;
gdb_assert (i < gdb_notifier.num_fds);
if ((gdb_notifier.poll_fds + i)->revents)
if (gdb_notifier.poll_fds[i].revents)
break;
}
@ -684,12 +663,12 @@ gdb_wait_for_event (int block)
file_ptr != NULL;
file_ptr = file_ptr->next_file)
{
if (file_ptr->fd == (gdb_notifier.poll_fds + i)->fd)
if (file_ptr->fd == gdb_notifier.poll_fds[i].fd)
break;
}
gdb_assert (file_ptr != NULL);
mask = (gdb_notifier.poll_fds + i)->revents;
mask = gdb_notifier.poll_fds[i].revents;
handle_file_event (file_ptr, mask);
return 1;
}