952db3328f
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@336 42af7a65-404d-4744-a932-0658087f49c3
132 lines
4.3 KiB
C
132 lines
4.3 KiB
C
/************************************************************
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* uip-wait.c
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*
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* Copyright (C) 2007 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
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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 <semaphore.h>
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#include <arch/irq.h>
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#include <net/uip/uip.h>
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/************************************************************
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* Definitions
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************************************************************/
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/************************************************************
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* Private Data
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************************************************************/
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/* Threads and tasks can both wait a semaphore. This
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* initializer uses internal, non-portable knowledge of the\
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* structure of sem_t to initialize it to the value 0.
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*/
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static sem_t uip_waitsem = { 0 }; /* Semaphore to wait on */
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static uint16 uip_waitflags = 0; /* UIP flags to wait for */
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/************************************************************
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* Private Functions
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************************************************************/
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/************************************************************
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* Global Functions
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************************************************************/
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/* This function is called user code to set up the wait */
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int uip_event_wait(uint16 waitflags)
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{
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/* Prevent conflicts with the interrupt level operation of
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* uip_event_signal().
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*/
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irqstate_t save = irqsave();
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/* At present, we support only a single waiter. If uip_waitflags
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* is non-zero on entry, then there is a problem.
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*/
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if ( uip_waitflags == 0)
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{
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/* If the requested event bits are not set in the uip_flags,
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* then wait. We will be awakened as soon as an interrupt is
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* received that sets these bits.
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*/
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goto errout_with_irqdisabled;
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}
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/* Loop until the requested bits are set in the flags */
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while ((waitflags & uip_flags) != 0)
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{
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/* Set the event flags that the caller is waiting on */
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uip_waitflags = waitflags;
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/* Wait for the event to occur */
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if (sem_wait(&uip_waitsem) != 0)
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{
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goto errout_with_irqdisabled;
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}
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}
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irqrestore(save);
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return OK;
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errout_with_irqdisabled:
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irqrestore(save);
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return ERROR;
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}
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/* This function is called from uip_interrupt() to wake up any
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* waiting threads/tasks.
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*/
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void uip_event_signal(void)
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{
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/* If any bits in uip_waitflags match bits set in uip_flags, then
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* there must be a thread/task waiting for this event to occur.
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*/
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if ((uip_waitflags & uip_flags) != 0)
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{
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sem_post(&uip_waitsem); /* Post the event */
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uip_waitflags = 0; /* Prohibit posting the event multiple times */
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}
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}
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