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spark: make cVideo::openDevice() more robust

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we sometimes seem to get EBUSY when opening the video device
directly after close() - retry for half a second to get it opened
This commit is contained in:
Stefan Seyfried
2012-02-25 21:18:07 +01:00
parent 1cddb85070
commit 7bf0a98909
1 changed files with 15 additions and 2 deletions
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17
libspark/video.cpp
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@@ -23,6 +23,7 @@
#include <sys/stat.h>
#include <unistd.h>
#include <utime.h>
#include <errno.h>
#include <cstring>
#include <cstdio>
@@ -156,13 +157,25 @@ cVideo::~cVideo(void)
void cVideo::openDevice(void)
{
int n = 0;
lt_debug("%s\n", __func__);
/* todo: this fd checking is racy, should be protected by a lock */
if (fd != -1) /* already open */
return;
retry:
if ((fd = open(VIDEO_DEVICE, O_RDWR)) < 0)
lt_info("%s cannot open %s: %m\n", __FUNCTION__, VIDEO_DEVICE);
fcntl(fd, F_SETFD, FD_CLOEXEC);
{
if (errno == EBUSY)
{
/* sometimes we get busy quickly after close() */
usleep(50000);
if (++n < 10)
goto retry;
}
lt_info("%s cannot open %s: %m, retries %d\n", __func__, VIDEO_DEVICE, n);
}
else
fcntl(fd, F_SETFD, FD_CLOEXEC);
playstate = VIDEO_STOPPED;
}