83cdb0c552
libc/semaphore: Add nxsem_getvalue() which is identical to sem_getvalue() except that it never modifies the errno variable. Changed all references to sem_getvalue in the OS to nxsem_getvalue().
sched/semaphore: Rename all internal private functions from sem_xyz to nxsem_xyz. The sem_ prefix is (will be) reserved only for the application semaphore interfaces.
libc/semaphore: Add nxsem_init() which is identical to sem_init() except that it never modifies the errno variable. Changed all references to sem_init in the OS to nxsem_init().
sched/semaphore: Rename sem_tickwait() to nxsem_tickwait() so that it is clear this is an internal OS function.
sched/semaphoate: Rename sem_reset() to nxsem_reset() so that it is clear this is an internal OS function.
104 lines
3.5 KiB
C
104 lines
3.5 KiB
C
/****************************************************************************
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* sched/semaphore/sem_timeout.c
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*
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* Copyright (C) 2011, 2013-2015 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 <errno.h>
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#include <nuttx/sched.h>
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#include <nuttx/wdog.h>
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#include <nuttx/irq.h>
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#include "semaphore/semaphore.h"
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxsem_timeout
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*
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* Description:
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* This function is called if the timeout elapses before before a
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* semaphore is acquired.
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*
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* Parameters:
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* argc - The number of arguments (should be 1)
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* pid - The task ID of the task to wakeup
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*
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* Return Value:
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* None
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*
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* Assumptions:
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* - Called from the context of the timer interrupt handler.
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*
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****************************************************************************/
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void nxsem_timeout(int argc, wdparm_t pid)
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{
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FAR struct tcb_s *wtcb;
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irqstate_t flags;
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/* Disable interrupts to avoid race conditions */
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flags = enter_critical_section();
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/* Get the TCB associated with this PID. It is possible that
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* task may no longer be active when this watchdog goes off.
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*/
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wtcb = sched_gettcb((pid_t)pid);
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/* It is also possible that an interrupt/context switch beat us to the
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* punch and already changed the task's state.
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*/
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if (wtcb && wtcb->task_state == TSTATE_WAIT_SEM)
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{
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/* Cancel the semaphore wait */
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nxsem_waitirq(wtcb, ETIMEDOUT);
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}
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/* Interrupts may now be enabled. */
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leave_critical_section(flags);
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}
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