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-rw-r--r--nuttx/sched/sched_lock.c110
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diff --git a/nuttx/sched/sched_lock.c b/nuttx/sched/sched_lock.c
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-/************************************************************************
- * sched/sched_lock.c
- *
- * Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- * 3. Neither the name NuttX nor the names of its contributors may be
- * used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
- * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
- * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
- * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
- * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
- * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
- * POSSIBILITY OF SUCH DAMAGE.
- *
- ************************************************************************/
-
-/************************************************************************
- * Included Files
- ************************************************************************/
-
-#include <nuttx/config.h>
-
-#include <sched.h>
-#include <assert.h>
-
-#include <nuttx/arch.h>
-#include "os_internal.h"
-
-/************************************************************************
- * Definitions
- ************************************************************************/
-
-/************************************************************************
- * Private Type Declarations
- ************************************************************************/
-
-/************************************************************************
- * Global Variables
- ************************************************************************/
-
-/************************************************************************
- * Private Variables
- ************************************************************************/
-
-/************************************************************************
- * Private Function Prototypes
- ************************************************************************/
-
-/************************************************************************
- * Private Functionss
- ************************************************************************/
-
-/************************************************************************
- * Public Functions
- ************************************************************************/
-
-/************************************************************************
- * Name: sched_lock
- *
- * Description:
- * This function disables context switching by disabling addition of
- * new tasks to the g_readytorun task list. The task that calls this
- * function will be the only task that is allowed to run until it
- * either calls sched_unlock() (the appropriate number of times) or
- * until it blocks itself.
- *
- * Inputs
- * None
- *
- * Return Value:
- * OK on success; ERROR on failure
- *
- ************************************************************************/
-
-int sched_lock(void)
-{
- _TCB *rtcb = (_TCB*)g_readytorun.head;
-
- /* Check for some special cases: (1) rtcb may be NULL only during
- * early boot-up phases, and (2) sched_lock() should have no
- * effect if called from the interrupt level.
- */
-
- if (rtcb && !up_interrupt_context())
- {
- ASSERT(rtcb->lockcount < MAX_LOCK_COUNT);
- rtcb->lockcount++;
- }
-
- return OK;
-}