Add the framework to support POSIX timers

git-svn-id: https://nuttx.svn.sourceforge.net/svnroot/nuttx/trunk@110 7fd9a85b-ad96-42d3-883c-3090e2eb8679

1 files changed, 108 insertions, 0 deletions

diff --git a/nuttx/sched/timer_getoverrun.c b/nuttx/sched/timer_getoverrun.c
new file mode 100644
index 0000000000..8dbd8da628
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+++ b/nuttx/sched/timer_getoverrun.c
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+/********************************************************************************
+ * timer_getoverrun.c
+ *
+ *   Copyright (C) 2007 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 Gregory Nutt 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 <time.h>
+#include <errno.h>
+
+#ifndef CONFIG_DISABLE_POSIX_TIMERS
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Data
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Data
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Function:  timer_getoverrun
+ *
+ * Description:
+ *   Only a single signal will be queued to the process for a given timer at any
+ *   point in time.  When a timer for which a signal is still pending expires, no
+ *   signal will be queued, and a timer overrun will occur. When a timer
+ *   expiration signal is delivered to or accepted by a process, if the
+ *   implementation  supports  the  Realtime Signals Extension, the
+ *   timer_getoverrun() function will return the timer expiration overrun count for
+ *   the specified timer. The overrun count returned contains the number of extra
+ *   timer expirations that occurred between the time the signal was generated
+ *   (queued) and when it was delivered or accepted, up to but not including an 
+ *   implementation-defined  maximum of DELAYTIMER_MAX. If the number of such
+ *   extra expirations is greater than or equal to DELAYTIMER_MAX, then the
+ *   overrun count will be set to DELAYTIMER_MAX. The value returned by
+ *   timer_getoverrun() will apply to the most recent expiration signal delivery
+ *   or acceptance for the timer.  If no expiration signal has been delivered
+ *   for the timer, or if the Realtime Signals Extension is not supported, the
+ *   return value of timer_getoverrun() is unspecified.
+ *
+ * Parameters:
+ *   timerid - The pre-thread timer, previously created by the call to
+ *   timer_create(), whose overrun count will be returned..
+ *
+ * Return Value:
+ *   If the timer_getoverrun() function succeeds, it will return the timer
+ *   expiration overrun count as explained above. timer_getoverrun() will fail if:
+ *
+ *   EINVAL - The timerid argument does not correspond to an ID returned by
+ *     timer_create() but not yet deleted by timer_delete().
+ *
+ * Assumptions:
+ *
+ ********************************************************************************/
+
+int timer_getoverrun(timer_t timerid)
+{
+#warning "Not Implemented"
+  return ENOTSUP;
+}
+
+#endif /* CONFIG_DISABLE_POSIX_TIMERS */