1 files changed, 95 insertions, 0 deletions
diff --git a/lib/libthr/thread/thr_setschedparam.c b/lib/libthr/thread/thr_setschedparam.c
new file mode 100644
index 0000000..eba5017
--- /dev/null
+++ b/lib/libthr/thread/thr_setschedparam.c
@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 1998 Daniel Eischen <eischen@vigrid.com>.
+ * All rights reserved.
+ *
+ * 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. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by Daniel Eischen.
+ * 4. Neither the name of the author nor the names of any co-contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY DANIEL EISCHEN 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 AUTHOR 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.
+ *
+ * $FreeBSD$
+ */
+
+#include "namespace.h"
+#include <sys/param.h>
+#include <errno.h>
+#include <pthread.h>
+#include "un-namespace.h"
+
+#include "thr_private.h"
+
+__weak_reference(_pthread_setschedparam, pthread_setschedparam);
+
+/*
+ * Set a thread's scheduling parameters, this should be done
+ * in kernel, doing it in userland is no-op.
+ */
+int
+_pthread_setschedparam(pthread_t pthread, int policy, 
+	const struct sched_param *param)
+{
+	struct pthread *curthread = _get_curthread();
+	int	ret = 0;
+
+	if ((param == NULL) || (policy < SCHED_FIFO) || (policy > SCHED_RR)) {
+		ret = EINVAL;
+	} else if (param->sched_priority < _thr_priorities[policy-1].pri_min ||
+		   param->sched_priority > _thr_priorities[policy-1].pri_max) {
+		ret = ENOTSUP;
+	} else if ((ret = _thr_ref_add(curthread, pthread, /*include dead*/0))
+	    == 0) {
+		/*
+		 * Lock the threads scheduling queue while we change
+		 * its priority:
+		 */
+		THR_THREAD_LOCK(curthread, pthread);
+		if (pthread->state == PS_DEAD) {
+			THR_THREAD_UNLOCK(curthread, pthread);
+			_thr_ref_delete(curthread, pthread);
+			return (ESRCH);
+		}
+
+		/* Set the scheduling policy: */
+		pthread->attr.sched_policy = policy;
+
+		if (param->sched_priority == pthread->base_priority)
+			/*
+			 * There is nothing to do; unlock the threads
+			 * scheduling queue.
+			 */
+			THR_THREAD_UNLOCK(curthread, pthread);
+		else {
+			pthread->base_priority = param->sched_priority;
+
+			/* Recalculate the active priority: */
+			pthread->active_priority = MAX(pthread->base_priority,
+			    pthread->inherited_priority);
+
+			THR_THREAD_UNLOCK(curthread, pthread);
+		}
+		_thr_ref_delete(curthread, pthread);
+	}
+	return (ret);
+}