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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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fs/fat/fs_fat32util.c
+12 -6
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@@ -1,7 +1,8 @@
/****************************************************************************
* fs/fat/fs_fat32util.c
*
* Copyright (C) 2007-2009, 2011, 2013, 2015 Gregory Nutt. All rights reserved.
* Copyright (C) 2007-2009, 2011, 2013, 2015, 2017 Gregory Nutt. All
* rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* References:
@@ -356,16 +357,21 @@ void fat_putuint32(FAR uint8_t *ptr, uint32_t value32)
void fat_semtake(struct fat_mountpt_s *fs)
{
/* Take the semaphore (perhaps waiting) */
int ret;
while (sem_wait(&fs->fs_sem) != 0)
do
{
/* The only case that an error should occur here is if
* the wait was awakened by a signal.
/* Take the semaphore (perhaps waiting) */
ret = nxsem_wait(&fs->fs_sem);
/* The only case that an error should occur here is if the wait was
* awakened by a signal.
*/
ASSERT(*get_errno_ptr() == EINTR);
DEBUGASSERT(ret == OK || ret == -EINTR);
}
while (ret == -EINTR);
}
/****************************************************************************