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This commit backs out most of commit b4747286b1.  That change was added because sem_wait() would sometimes cause cancellation points inappropriated.  But with these recent changes, nxsem_wait() is used instead and it is not a cancellation point.

    In the OS, all calls to sem_wait() changed to nxsem_wait().  nxsem_wait() does not return errors via errno so each place where nxsem_wait() is now called must not examine the errno variable.

    In all OS functions (not libraries), change sem_wait() to nxsem_wait().  This will prevent the OS from creating bogus cancellation points and from modifying the per-task errno variable.

    sched/semaphore:  Add the function nxsem_wait().  This is a new internal OS interface.  It is functionally equivalent to sem_wait() except that (1) it is not a cancellation point, and (2) it does not set the per-thread errno value on return.
This commit is contained in:
Gregory Nutt
2017-10-04 15:22:27 -06:00
parent 42a0796615
commit 9568600ab1
307 changed files with 3421 additions and 2423 deletions
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audio/audio.c
+3 -3
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@@ -150,7 +150,7 @@ static int audio_open(FAR struct file *filep)
/* Get exclusive access to the device structures */
ret = sem_wait(&upper->exclsem);
ret = nxsem_wait(&upper->exclsem);
if (ret < 0)
{
ret = -errno;
@@ -202,7 +202,7 @@ static int audio_close(FAR struct file *filep)
/* Get exclusive access to the device structures */
ret = sem_wait(&upper->exclsem);
ret = nxsem_wait(&upper->exclsem);
if (ret < 0)
{
ret = -errno;
@@ -362,7 +362,7 @@ static int audio_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
/* Get exclusive access to the device structures */
ret = sem_wait(&upper->exclsem);
ret = nxsem_wait(&upper->exclsem);
if (ret < 0)
{
return ret;