Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / drivers / staging / unisys / uislib / uisthread.c

diff --git a/kernel/drivers/staging/unisys/uislib/uisthread.c b/kernel/drivers/staging/unisys/uislib/uisthread.c
new file mode 100644 (file)
index 0000000..d3c973b
--- /dev/null
+++ b/kernel/drivers/staging/unisys/uislib/uisthread.c
@@ -0,0 +1,69 @@
+/* uisthread.c
+ *
+ * Copyright (C) 2010 - 2013 UNISYS CORPORATION
+ * All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at
+ * your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
+ * NON INFRINGEMENT.  See the GNU General Public License for more
+ * details.
+ */
+
+/* @ALL_INSPECTED */
+#include <asm/processor.h>
+#include <linux/signal.h>
+#include <linux/sched.h>
+#include <linux/kthread.h>
+#include "uisutils.h"
+#include "uisthread.h"
+
+/* this is shorter than using __FILE__ (full path name) in
+ * debug/info/error messages
+ */
+#define CURRENT_FILE_PC UISLIB_PC_uisthread_c
+#define __MYFILE__ "uisthread.c"
+
+/*****************************************************/
+/* Exported functions                                */
+/*****************************************************/
+
+/* returns 0 for failure, 1 for success */
+int
+uisthread_start(struct uisthread_info *thrinfo,
+               int (*threadfn)(void *), void *thrcontext, char *name)
+{
+       /* used to stop the thread */
+       init_completion(&thrinfo->has_stopped);
+       thrinfo->task = kthread_run(threadfn, thrcontext, name);
+       if (IS_ERR(thrinfo->task)) {
+               thrinfo->id = 0;
+               return 0;       /* failure */
+       }
+       thrinfo->id = thrinfo->task->pid;
+       return 1;
+}
+EXPORT_SYMBOL_GPL(uisthread_start);
+
+void
+uisthread_stop(struct uisthread_info *thrinfo)
+{
+       int stopped = 0;
+
+       if (thrinfo->id == 0)
+               return;         /* thread not running */
+
+       kthread_stop(thrinfo->task);
+       /* give up if the thread has NOT died in 1 minute */
+       if (wait_for_completion_timeout(&thrinfo->has_stopped, 60 * HZ))
+               stopped = 1;
+
+       if (stopped)
+               thrinfo->id = 0;
+}
+EXPORT_SYMBOL_GPL(uisthread_stop);