luchianmihai/walnux
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

drivers/pipes: fix write busy loop because POLLOUT always ready.

Browse source 
the size of pipes buffer +1 as compensate the full indicator

Signed-off-by: dongjiuzhu1 <dongjiuzhu1@xiaomi.com>
This commit is contained in:
dongjiuzhu1 2023-01-30 21:53:07 +08:00 • committed by Xiang Xiao
parent 004853d6d1
commit 74e032e924
1 changed files with 2 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/pipes/pipe_common.c
View file

@ -441,7 +441,7 @@ ssize_t pipecommon_read(FAR struct file *filep, FAR char *buffer, size_t len)
* FIFO when buffer can accept more than d_polloutthrd bytes.
*/
if (pipecommon_bufferused(dev) < (dev->d_bufsize - dev->d_polloutthrd))
if (pipecommon_bufferused(dev) < (dev->d_bufsize - 1 - dev->d_polloutthrd))
{
poll_notify(dev->d_fds, CONFIG_DEV_PIPE_NPOLLWAITERS, POLLOUT);
}
@ -699,7 +699,7 @@ int pipecommon_poll(FAR struct file *filep, FAR struct pollfd *fds,
eventset = 0;
if ((filep->f_oflags & O_WROK) &&
nbytes < (dev->d_bufsize - dev->d_polloutthrd))
nbytes < (dev->d_bufsize - 1 - dev->d_polloutthrd))
{
eventset |= POLLOUT;
}