/**************************************************************************** * sched/semaphore/sem_timeout.c * * Copyright (C) 2011, 2013-2015 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * 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 #include #include #include #include #include "semaphore/semaphore.h" /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: sem_timeout * * Description: * This function is called if the timeout elapses before before a * semaphore is acquired. * * Parameters: * argc - The number of arguments (should be 1) * pid - The task ID of the task to wakeup * * Return Value: * None * * Assumptions: * - Called from the context of the timer interrupt handler. * ****************************************************************************/ void sem_timeout(int argc, wdparm_t pid) { FAR struct tcb_s *wtcb; irqstate_t flags; /* Disable interrupts to avoid race conditions */ flags = irqsave(); /* Get the TCB associated with this PID. It is possible that * task may no longer be active when this watchdog goes off. */ wtcb = sched_gettcb((pid_t)pid); /* It is also possible that an interrupt/context switch beat us to the * punch and already changed the task's state. */ if (wtcb && wtcb->task_state == TSTATE_WAIT_SEM) { /* Cancel the semaphore wait */ sem_waitirq(wtcb, ETIMEDOUT); } /* Interrupts may now be enabled. */ irqrestore(flags); }