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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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binfmt/pcode.c
+4 -4
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@@ -1,7 +1,7 @@
/****************************************************************************
* binfmt/pcode.c
*
* Copyright (C) 2014-2016 Gregory Nutt. All rights reserved.
* Copyright (C) 2014-2017 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
@@ -459,10 +459,10 @@ static int pcode_load(struct binary_s *binp)
do
{
ret = sem_wait(&g_pcode_handoff.exclsem);
DEBUGASSERT(ret == OK || get_errno() == EINTR);
ret = nxsem_wait(&g_pcode_handoff.exclsem);
DEBUGASSERT(ret == OK || ret == -EINTR);
}
while (ret < 0);
while (ret == -EINTR);
/* Save the data that we need to handoff to the child thread */