Added support for POSIX timers

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@111 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 163 insertions, 0 deletions

diff --git a/nuttx/sched/timer_initialize.c b/nuttx/sched/timer_initialize.c
new file mode 100644
index 000000000..a32189e89
--- /dev/null
+++ b/nuttx/sched/timer_initialize.c
@@ -0,0 +1,163 @@
+/********************************************************************************
+ * timer_initialize.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 <queue.h>
+#include <errno.h>
+#include <nuttx/compiler.h>
+#include "timer_internal.h"
+
+#ifndef CONFIG_DISABLE_POSIX_TIMERS
+
+/********************************************************************************
+ * Definitions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Private Data
+ ********************************************************************************/
+
+/* These are the preallocated times */
+
+#if CONFIG_PREALLOC_TIMERS > 0
+static struct posix_timer_s g_prealloctimers[CONFIG_PREALLOC_TIMERS];
+#endif
+
+/********************************************************************************
+ * Public Data
+ ********************************************************************************/
+
+/* This is a list of free, preallocated timer structures */
+
+#if CONFIG_PREALLOC_TIMERS > 0
+volatile sq_queue_t g_freetimers;
+#endif
+
+/* This is a list of instantiated timer structures -- active and inactive.  The
+ * timers are place on this list by timer_create() and removed from the list by
+ * timer_delete() or when the owning thread exits.
+ */
+
+volatile sq_queue_t g_alloctimers;
+
+/********************************************************************************
+ * Private Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Public Functions
+ ********************************************************************************/
+
+/********************************************************************************
+ * Function:  timer_initialize
+ *
+ * Description:
+ *   Boot up configuration of the POSIX timer facility.
+ *
+ * Parameters:
+ *   None
+ *
+ * Return Value:
+ *   None
+ *
+ * Assumptions:
+ *
+ ********************************************************************************/
+
+void weak_function timer_initialize(void)
+{
+  int i;
+
+  /* Place all of the pre-allocated timers into the free timer list */
+
+#if CONFIG_PREALLOC_TIMERS > 0
+  sq_init((sq_queue_t*)&g_freetimers);
+
+  for (i = 0; i < CONFIG_PREALLOC_TIMERS; i++)
+    {
+      g_prealloctimers[i].pt_flags = PT_FLAGS_PREALLOCATED;
+      sq_addlast((FAR sq_entry_t*)&g_prealloctimers[i], (FAR sq_queue_t*)&g_freetimers);
+    }
+#endif
+
+  /* Initialize the list of allocated timers */
+
+  sq_init((sq_queue_t*)&g_alloctimers);
+}
+
+/********************************************************************************
+ * Function:  timer_deleteall
+ *
+ * Description:
+ *   This function is called whenever a thread exits.  Any timers owned by that
+ *   thread are deleted as though called by timer_delete().
+ *
+ *   It is provided in this file so that it can be weakly defined but also,
+ *   like timer_intitialize(), be brought into the link whenever the timer
+ *   resources are referenced.
+ *
+ * Parameters:
+ *   pid - the task ID of the thread that exitted
+ *
+ * Return Value:
+ *   None
+ *
+ * Assumptions:
+ *
+ ********************************************************************************/
+
+void weak_function timer_deleteall(pid_t pid)
+{
+  FAR struct posix_timer_s *timer;
+  FAR struct posix_timer_s *next;
+  irqstate_t flags;
+
+  flags = irqsave();
+  for (timer = g_alloctimers.head; timer; timer = next)
+    {
+      next = timer->flink;
+      if (timer->pt_owner = pid)
+        {
+          timer_delete((timer_t)timer);
+        }
+    }
+}
+
+#endif /* CONFIG_DISABLE_POSIX_TIMERS */