96 lines
3.4 KiB
C
96 lines
3.4 KiB
C
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/****************************************************************************
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* sched/irq/irq_restore.c
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*
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* Copyright (C) 2016 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include "sched/sched.h"
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#include "irq/irq.h"
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#ifdef CONFIG_SMP
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: irq_restore_lock
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*
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* Description:
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* Restore the state of g_cpu_irqlock. This function is called after a
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* context switch. A consequence of the context switch is that the the
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* global g_cpu_irqlock spinlock may need to change states. However, the
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* actual realization of that change cannot occur until all context
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* switching operations have completed. This function implements the
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* deferred setting of g_cpu_irqlock.
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*
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* Input Parameters:
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* None
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*
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* Returned Value:
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* None
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*
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* Assumptions:
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* g_cpu_irqlock is set upon entry. It may or may not be set upon return.
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*
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****************************************************************************/
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void irq_restore_lock(void)
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{
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FAR struct tcb_s *rtcb;
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int cpu;
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cpu = this_cpu();
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rtcb = current_task(cpu);
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/* Adjust global IRQ controls. If the irqcount of the newly running task is
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* greater than zero, then this task/CPU holds the IRQ lock
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*/
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if (rtcb->irqcount > 0)
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{
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spin_setbit(&g_cpu_irqset, cpu, &g_cpu_irqsetlock, &g_cpu_irqlock);
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}
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else
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{
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spin_clrbit(&g_cpu_irqset, cpu, &g_cpu_irqsetlock, &g_cpu_irqlock);
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}
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}
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#endif /* CONFIG_SMP */
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