Added pthread_setschedprio()

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@135 42af7a65-404d-4744-a932-0658087f49c3

sched/Makefile

@@ -95,7 +95,7 @@ PTHREAD_SRCS	= pthread_attrinit.c pthread_attrdestroy.c \
 		  pthread_cancel.c pthread_setcancelstate.c \
 		  pthread_keycreate.c pthread_setspecific.c pthread_getspecific.c pthread_keydelete.c \
 		  pthread_initialize.c pthread_completejoin.c pthread_findjoininfo.c \
-		  pthread_removejoininfo.c pthread_once.c
+		  pthread_removejoininfo.c pthread_once.c pthread_setschedprio.c
 ifneq ($(CONFIG_DISABLE_SIGNALS),y)
 PTHREAD_SRCS	+= pthread_condtimedwait.c pthread_kill.c pthread_sigmask.c
 endif

sched/pthread_setschedprio.c

@@ -0,0 +1,121 @@
+/****************************************************************************
+ * pthread_schedsetprio.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 <sys/types.h>
+#include <sched.h>
+#include <errno.h>
+#include <nuttx/arch.h>
+#include <nuttx/os_external.h>
+#include "os_internal.h"
+
+/****************************************************************************
+ * Definitions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Type Declarations
+ ****************************************************************************/
+
+/****************************************************************************
+ * Global Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Variables
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Function Prototypes
+ ****************************************************************************/
+
+/****************************************************************************
+ * Private Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name:  pthread_setsetprio
+ *
+ * Description:
+ *   The pthread_setschedprio() function sets the scheduling priority for the
+ *   thread whose thread ID is given by 'thread' to the value given by 'prio'.
+ *   If the  thread_setschedprio() function fails, the scheduling priority
+ *   of the target thread will not be changed.
+ *
+ * Inputs:
+ *   thread - the thread ID of the task to reprioritize.
+ *   prio - The new thread priority.  The range of valid priority numbers is
+ *     from SCHED_PRIORITY_MIN through SCHED_PRIORITY_MAX.
+ *
+ * Return Value:
+ *    OK if successful, otherwise an error number.  This function can
+ *    fail for the following reasons:
+ *
+ *    EINVAL - prio is out of range.
+ *    ESRCH  - thread ID does not correspond to any thread.
+ *
+ * Assumptions:
+ *
+ ****************************************************************************/
+
+int pthread_setschedprio(pthread_t thread, int prio)
+{
+  struct sched_param param;
+  int ret;
+
+  /* Set the errno to some non-zero value (failsafe) */
+
+  *get_errno_ptr() = EINVAL;
+
+  /* Call sched_setparam() to change the priority */
+
+  param.sched_priority = prio;
+  ret = sched_setparam((pid_t)thread, &param);
+  if (ret != OK)
+    {
+      /* If sched_setparam() fails, return the errno */
+
+      ret = *get_errno_ptr();
+    }
+  return ret;
+}