2011-09-15 Petr Benes <benesp16@fel.cvut.cz>

	PR 1906/cpukit
	* sapi/Makefile.am, sapi/preinstall.am, sapi/include/confdefs.h,
	score/Makefile.am, score/preinstall.am: Add the CBS (Constant
	Bandwidth Server) scheduler. This is a complex scheduling policy
	built atop of the EDF scheduler. Unlike other schedulers, this one
	provides a user API and handles not only deadlines of tasks but also
	claimed budget per period. The main aim of the scheduler is isolation
	of tasks so that each task is guaranteed to meet all deadlines
	regardless of how other tasks behave.
	* sapi/include/rtems/cbs.h, sapi/inline/rtems/cbs.inl,
	score/include/rtems/score/schedulercbs.h, score/src/schedulercbs.c,
	score/src/schedulercbsattachthread.c,
	score/src/schedulercbscleanup.c,
	score/src/schedulercbscreateserver.c,
	score/src/schedulercbsdestroyserver.c,
	score/src/schedulercbsdetachthread.c,
	score/src/schedulercbsgetapprovedbudget.c,
	score/src/schedulercbsgetexecutiontime.c,
	score/src/schedulercbsgetparameters.c,
	score/src/schedulercbsgetremainingbudget.c,
	score/src/schedulercbsgetserverid.c,
	score/src/schedulercbsreleasejob.c,
	score/src/schedulercbssetparameters.c,
	score/src/schedulercbsunblock.c: New files.

1 files changed, 52 insertions, 0 deletions

diff --git a/cpukit/score/src/schedulercbsreleasejob.c b/cpukit/score/src/schedulercbsreleasejob.c
new file mode 100644
index 0000000000..c64b60ffb1
--- /dev/null
+++ b/cpukit/score/src/schedulercbsreleasejob.c
@@ -0,0 +1,52 @@
+/*
+ *  Copyright (C) 2011 Petr Benes.
+ *  Copyright (C) 2011 On-Line Applications Research Corporation (OAR).
+ *
+ *  The license and distribution terms for this file may be
+ *  found in the file LICENSE in this distribution or at
+ *  http://www.rtems.com/license/LICENSE.
+ *
+ *  $Id$
+ */
+
+#if HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#include <rtems/system.h>
+#include <rtems/config.h>
+#include <rtems/score/scheduler.h>
+#include <rtems/score/schedulercbs.h>
+
+void _Scheduler_CBS_Release_job(
+  Thread_Control    *the_thread,
+  uint32_t           deadline
+)
+{
+  Priority_Control new_priority;
+  Scheduler_CBS_Per_thread *sched_info =
+    (Scheduler_CBS_Per_thread *) the_thread->scheduler_info;
+  Scheduler_CBS_Server *serv_info =
+    (Scheduler_CBS_Server *) sched_info->cbs_server;
+
+  if (deadline) {
+    /* Initializing or shifting deadline. */
+    if (serv_info && serv_info->parameters.budget)
+      new_priority = (_Watchdog_Ticks_since_boot + serv_info->parameters.deadline)
+        & ~SCHEDULER_EDF_PRIO_MSB;
+    else
+      new_priority = (_Watchdog_Ticks_since_boot + deadline)
+        & ~SCHEDULER_EDF_PRIO_MSB;
+  }
+  else {
+    /* Switch back to background priority. */
+    new_priority = the_thread->Start.initial_priority;
+  }
+
+  /* Budget replenishment for the next job. */
+  if (serv_info && serv_info->parameters.budget)
+    the_thread->cpu_time_budget = serv_info->parameters.budget;
+
+  the_thread->real_priority = new_priority;
+  _Thread_Change_priority(the_thread, new_priority, true);
+}