From 0cc9b20c15460213e488bf5e70963b941482f628 Mon Sep 17 00:00:00 2001
From: William Harrington <kb0iic@berzerkula.org>
Date: Tue, 14 Jan 2025 16:06:02 -0600
Subject: Add source.

---
 sdk/proc/priority.c | 73 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 sdk/proc/priority.c

(limited to 'sdk/proc/priority.c')

diff --git a/sdk/proc/priority.c b/sdk/proc/priority.c
new file mode 100644
index 0000000..8818567
--- /dev/null
+++ b/sdk/proc/priority.c
@@ -0,0 +1,73 @@
+/*
+ * Specify process for soft realtime scheduling treatment.
+ * $Id$
+ * Copyright (c) 1997 by Tycho Softworks.
+ * For conditions of distribution and reuse see product license.
+ */
+ 
+#include <proc/process.h>
+#include <std/time.h>
+
+#ifndef	SYS_RESOURCE_H_MISSING
+#include <sys/resource.h>
+#endif
+
+#ifndef	SETPRIORITY_F_MISSING
+
+int	priority(int pri)
+{
+#ifdef	_POSIX_PRIORITY_SCHEDULING
+	#define	_P	__P
+
+	#include <sched.h>
+
+	struct	sched_param p;
+#endif
+	int newpri = getpriority(PRIO_PROCESS, 0) - pri - 1;
+
+	if(setpriority(PRIO_PROCESS, 0, newpri))
+		return -1;
+
+#ifdef	_POSIX_MEMLOCK
+	#include <linux/mman.h>
+
+	if(mlockall(MCL_CURRENT | MCL_FUTURE))
+		return -1;
+#endif
+
+#ifdef	_POSIX_PRIORITY_SCHEDULING
+	if(pri > 0)
+	{
+		p.sched_priority = sched_get_priority_min(SCHED_RR) + pri - 1;
+		if(sched_setscheduler(0, SCHED_RR, &p))
+			return -1;
+	} 
+#endif
+	
+	return 0;
+}
+
+#else
+
+int	priority(int priority)
+{
+	return nice(- priority - 1);
+}
+#endif
+
+#ifdef	_POSIX_PRIORITY_SCHEDULING
+#include <sched.h>
+
+void	yield(void)
+{
+	sched_yield();
+}
+#else
+
+void	yield(void)
+{
+	sleep(0);
+}
+#endif
+	
+
-- 
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