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dm: create mevent's pipe in non-blocking mode

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It was designed to be used in non-blocking mode to prevent the mevent
thread from blocking itself indefinitely, but it was created in
blocking mode.

Tracked-On: #2319
Signed-off-by: Peter Fang <peter.fang@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
This commit is contained in:
Peter Fang 2019-01-10 16:27:15 -08:00 committed by wenlingz
parent a9709bf857
commit d1e1aa3077
1 changed files with 6 additions and 3 deletions
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9
devicemodel/core/mevent.c
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@ -35,6 +35,7 @@
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/epoll.h>
#include <sys/queue.h>
@ -96,7 +97,7 @@ static void
mevent_pipe_read(int fd, enum ev_type type, void *param)
{
char buf[MEVENT_MAX];
int status;
ssize_t status;
/*
* Drain the pipe read side. The fd is non-blocking so this is
@ -107,7 +108,7 @@ mevent_pipe_read(int fd, enum ev_type type, void *param)
} while (status == MEVENT_MAX);
}
/*On error, -1 is returned, else return zero*/
/* On error, -1 is returned, else return zero */
int
mevent_notify(void)
{
@ -247,6 +248,7 @@ mevent_add(int tfd, enum ev_type type,
ee.events = mevent_kq_filter(mevp);
ee.data.ptr = mevp;
ret = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, mevp->me_fd, &ee);
if (ret == 0) {
mevent_qlock();
LIST_INSERT_HEAD(&global_head, mevp, me_list);
@ -408,7 +410,7 @@ mevent_dispatch(void)
* the blocking kqueue call to exit by writing to it. Set the
* descriptor to non-blocking.
*/
ret = pipe(mevent_pipefd);
ret = pipe2(mevent_pipefd, O_NONBLOCK);
if (ret < 0) {
perror("pipe");
exit(0);
@ -427,6 +429,7 @@ mevent_dispatch(void)
* Block awaiting events
*/
ret = epoll_wait(epoll_fd, eventlist, MEVENT_MAX, -1);
if (ret == -1 && errno != EINTR)
perror("Error return from epoll_wait");