1 files changed, 131 insertions, 0 deletions
diff --git a/nuttx/sched/sched_getscheduler.c b/nuttx/sched/sched_getscheduler.c
new file mode 100644
index 000000000..5771e86ff
--- /dev/null
+++ b/nuttx/sched/sched_getscheduler.c
@@ -0,0 +1,131 @@
+/************************************************************************
+ * sched/sched_getscheduler.c
+ *
+ *   Copyright (C) 2007, 2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <gnutt@nuttx.org>
+ *
+ * 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 <nuttx/config.h>
+
+#include <sys/types.h>
+#include <sched.h>
+#include <errno.h>
+
+#include <nuttx/arch.h>
+
+#include "os_internal.h"
+
+/************************************************************************
+ * Definitions
+ ************************************************************************/
+
+/************************************************************************
+ * Private Type Declarations
+ ************************************************************************/
+
+/************************************************************************
+ * Global Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Variables
+ ************************************************************************/
+
+/************************************************************************
+ * Private Function Prototypes
+ ************************************************************************/
+
+/************************************************************************
+ * Private Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Public Functions
+ ************************************************************************/
+
+/************************************************************************
+ * Name: sched_getscheduler
+ *
+ * Description:
+ *   sched_getscheduler() returns the scheduling policy currently
+ *   applied to the task identified by pid. If pid equals zero, the
+ *   policy of the calling task will be retrieved.
+ *
+ * Inputs:
+ *   pid - the task ID of the task to query.  If pid is zero, the
+ *     calling task is queried.
+ *
+ * Return Value:
+ *    On success, sched_getscheduler() returns the policy for the task
+ *    (either SCHED_FIFO or SCHED_RR).  On error,  ERROR (-1) is
+ *    returned, and errno is set appropriately:
+ *
+ *      ESRCH  The task whose ID is pid could not be found.
+ *
+ * Assumptions:
+ *
+ ************************************************************************/
+
+int sched_getscheduler(pid_t pid)
+{
+  _TCB *tcb;
+
+  /* Verify that the pid corresponds to a real task */
+
+  if (!pid)
+    {
+      tcb = (_TCB*)g_readytorun.head;
+    }
+  else
+    {
+      tcb = sched_gettcb(pid);
+    }
+
+  if (!tcb)
+    {
+      set_errno(ESRCH);
+      return ERROR;
+    }
+#if CONFIG_RR_INTERVAL > 0
+  else if ((tcb->flags & TCB_FLAG_ROUND_ROBIN) != 0)
+    {
+      return SCHED_RR;
+    }
+#endif
+  else
+    {
+      return SCHED_FIFO;
+    }
+}