From 3445e102f16ef5ef0ae0a1c78c16a98ce3d2e5b0 Mon Sep 17 00:00:00 2001
From: Bjoern Brandenburg <bbb@mpi-sws.org>
Date: Tue, 14 Aug 2012 20:32:15 +0200
Subject: Add testcase for preemptions on wakeup under P-EDF and P-FP

Resuming higher-priority tasks should of course preempt lower-priority
tasks. This test case infers if higher-priority tasks are unreasonably
delayed.
---
 tests/sched.c | 82 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 82 insertions(+)
 create mode 100644 tests/sched.c

(limited to 'tests')

diff --git a/tests/sched.c b/tests/sched.c
new file mode 100644
index 0000000..ab47a91
--- /dev/null
+++ b/tests/sched.c
@@ -0,0 +1,82 @@
+#include <sys/wait.h> /* for waitpid() */
+#include <unistd.h>
+#include <stdio.h>
+
+#include "tests.h"
+#include "litmus.h"
+
+TESTCASE(preempt_on_resume, P_FP | PSN_EDF,
+	 "preempt lower-priority task when a higher-priority task resumes")
+{
+	int child_hi, child_lo, status, waiters;
+	lt_t delay = ms2lt(100);
+	double start, stop;
+
+	struct rt_task params;
+	params.cpu        = 0;
+	params.exec_cost  =  ms2lt(10000);
+	params.period     = ms2lt(100000);
+	params.relative_deadline = params.period;
+	params.phase      = 0;
+	params.cls        = RT_CLASS_HARD;
+	params.budget_policy = NO_ENFORCEMENT;
+
+	child_lo = FORK_TASK(
+		params.priority = LITMUS_LOWEST_PRIORITY;
+		SYSCALL( set_rt_task_param(gettid(), &params) );
+		SYSCALL( be_migrate_to(params.cpu) );
+		SYSCALL( task_mode(LITMUS_RT_TASK) );
+
+		SYSCALL( wait_for_ts_release() );
+
+		start = cputime();
+
+		while (cputime() - start < 10)
+			;
+
+		);
+
+	child_hi = FORK_TASK(
+		params.priority	= LITMUS_HIGHEST_PRIORITY;
+		params.relative_deadline -= 1000000;
+		SYSCALL( set_rt_task_param(gettid(), &params) );
+		SYSCALL( be_migrate_to(params.cpu) );
+		SYSCALL( task_mode(LITMUS_RT_TASK) );
+
+		SYSCALL( wait_for_ts_release() );
+
+		start = cputime();
+
+		while (cputime() - start < 0.1)
+			;
+
+		start = wctime();
+		SYSCALL( lt_sleep(ms2lt(100)) );
+		stop = wctime();
+
+		SYSCALL( kill(child_lo, SIGUSR2) );
+
+		if (stop - start >= 0.2)
+			fprintf(stderr, "\nHi-prio delay = %fsec\n",
+				stop - start - (ms2lt(100) / 1E9));
+
+		/* Assert we woke up 'soonish' after the sleep. */
+		ASSERT( stop - start < 0.2 );
+		);
+
+
+	do {
+		waiters = get_nr_ts_release_waiters();
+		ASSERT( waiters >= 0 );
+	} while (waiters != 2);
+
+	waiters = release_ts(&delay);
+
+	SYSCALL( waitpid(child_hi, &status, 0) );
+	ASSERT( status == 0 );
+
+	SYSCALL( waitpid(child_lo, &status, 0) );
+	ASSERT( status ==  SIGUSR2);
+}
+
+
-- 
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