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drivers/rwbuffer.c: Back out unfinished changes 

This file is a work in progress and was accidentally committed with some other files.  This PR backs out those changes until I can better verify the changes.
This commit is contained in:
Gregory Nutt 2020-03-31 15:13:48 -06:00 committed by Abdelatif Guettouche
parent 997d4fabb0
commit 92eae74340
1 changed files with 6 additions and 41 deletions
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47
drivers/rwbuffer.c
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@ -63,9 +63,9 @@
* Name: rwb_semtake
****************************************************************************/
static int rwb_semtake(FAR sem_t *sem)
static void rwb_semtake(FAR sem_t *sem)
{
return nxsem_wait_uninterruptible(sem);
nxsem_wait_uninterruptible(sem);
}
/****************************************************************************
@ -74,34 +74,6 @@ static int rwb_semtake(FAR sem_t *sem)
#define rwb_semgive(s) nxsem_post(s)
/****************************************************************************
* Name: rwb_forcetake
*
* Description:
* This is just another wrapper but this one continues even if the thread
* is canceled. This must be done in certain conditions where were must
* continue in order to clean-up resources.
*
****************************************************************************/
static void rwb_forcetake(FAR sem_t *sem)
{
int ret;
do
{
ret = nxsem_wait_uninterruptible(sem);
/* The only expected error would -ECANCELED meaning that the
* parent thread has been canceled. We have to continue and
* terminate the poll in this case.
*/
DEBUGASSERT(ret == OK || ret == -ECANCELED);
}
while (ret < 0);
}
/****************************************************************************
* Name: rwb_overlap
****************************************************************************/
@ -194,7 +166,7 @@ static void rwb_wrtimeout(FAR void *arg)
* worker thread.
*/
rwb_forcetake(&rwb->wrsem);
rwb_semtake(&rwb->wrsem);
rwb_wrflush(rwb);
rwb_semgive(&rwb->wrsem);
}
@ -422,7 +394,7 @@ int rwb_invalidate_writebuffer(FAR struct rwbuffer_s *rwb,
finfo("startblock=%d blockcount=%p\n", startblock, blockcount);
rwb_forcetake(&rwb->wrsem);
rwb_semtake(&rwb->wrsem);
/* Now there are five cases:
*
@ -559,7 +531,7 @@ int rwb_invalidate_readahead(FAR struct rwbuffer_s *rwb,
finfo("startblock=%d blockcount=%p\n", startblock, blockcount);
rwb_forcetake(&rwb->rhsem);
rwb_semtake(&rwb->rhsem);
/* Now there are five cases:
*
@ -793,14 +765,7 @@ static ssize_t rwb_read_(FAR struct rwbuffer_s *rwb, off_t startblock,
/* Loop until we have read all of the requested blocks */
ret = nxsem_wait(&rwb->rhsem);
if (ret < 0)
{
/* Return EINTR or ECANCELED */
return ret;
}
rwb_semtake(&rwb->rhsem);
for (remaining = nblocks; remaining > 0; )
{
/* Is there anything in the read-ahead buffer? */