*
* \brief Semaphore test.
*
+ * For testing priority inversion (avoidance) a set of processes
+ * interacting among each others by means of two semaphores are
+ * disturbed by an unrelated process, i.e., a process not using
+ * any semaphore at all.
+ *
+ * In case of priority inversion, high priority processes
+ * are affected (delayed!) by such process, even it has lower
+ * priority, because of semaphores. On the other hand, when priority
+ * inheritance is enabled, non interacting low priority processes
+ * can't affect the execution of high priority ones.
+ *
+ * It all can be seen looking at the finishing time of the various
+ * processes involved in sem_inv_test (logged).
+ *
+ * Notice that priority inheritance makes sense iff priorities
+ * exist, so the whole test depends on CONFIG_KERN_PRI.
*
* \author Daniele Basile <asterix@develer.com>
* \author Stefano Fedrigo <aleph@develer.com>
+ * \author Dario Faggioli <raistlin@linux.it>
*
* $test$: cp bertos/cfg/cfg_proc.h $cfgdir/
* $test$: echo "#undef CONFIG_KERN" >> $cfgdir/cfg_proc.h
* $test$: echo "#define CONFIG_KERN 1" >> $cfgdir/cfg_proc.h
+ * $test$: echo "#undef CONFIG_KERN_PRI" >> $cfgdir/cfg_proc.h
+ * $test$: echo "#define CONFIG_KERN_PRI 1" >> $cfgdir/cfg_proc.h
* $test$: cp bertos/cfg/cfg_sem.h $cfgdir/
* $test$: echo "#undef CONFIG_KERN_SEMAPHORES" >> $cfgdir/cfg_sem.h
* $test$: echo "#define CONFIG_KERN_SEMAPHORES 1" >> $cfgdir/cfg_sem.h
#include <drv/timer.h>
-// Global settings for the test.
+// Global settings for the serialization test.
#define MAX_GLOBAL_COUNT 1024
#define TEST_TIME_OUT_MS 6000
#define DELAY 5
-// Settings for the test process.
+// Settings for the test processes (serialization test).
//Process 1
#define INC_PROC_T1 1
#define DELAY_PROC_T1 INC_PROC_T1*DELAY
#define PROC_TEST_STACK(num) PROC_DEFINE_STACK(proc_sem_test##num##_stack, KERN_MINSTACKSIZE * 2)
#define PROC_TEST_INIT(num) proc_new(proc_semTest##num, NULL, sizeof(proc_sem_test##num##_stack), proc_sem_test##num##_stack);
-// Define process
+// Define processes for the serialization test.
PROC_TEST(1)
PROC_TEST(2)
PROC_TEST(3)
PROC_TEST(7)
PROC_TEST(8)
-// Define process stacks for test.
+#if CONFIG_KERN_PRI
+
+// Global settings for the priority inversion test.
+// 0.5 secs, enough for seeing the effects
+#define BASETIME 500
+
+Semaphore s1, s2;
+unsigned int loops = 0; // For counting iterations
+int finishing_time[8];
+
+enum ProcType {NONE, S1, S2, S1S2};
+/*
+ * Macros for the processes of the priority inversion test.
+ */
+#define PROC_INV_TEST(num) static void proc_semInvTest##num(void) \
+{ \
+ ProcType p_type = (ProcType)((long) proc_currentUserData()); \
+ int mult = p_type == NONE ? 5 : 1; \
+ unsigned int i, local_count = 0; \
+ ticks_t start; \
+ \
+ kprintf("> test%d(%d): Start.\n", num, proc_current()->link.pri); \
+ finishing_time[num-1] = timer_clock(); \
+ \
+ if (p_type == S1 || p_type == S1S2) { \
+ kprintf("> test%d(prio=%d): Obtain %p..\n", num, \
+ proc_current()->link.pri, &s1); \
+ sem_obtain(&s1); \
+ kprintf("> test%d(prio=%d): Obtained %p.\n", num, \
+ proc_current()->link.pri, &s1); \
+ } \
+ if (p_type == S2 || p_type == S1S2) { \
+ kprintf("> test%d(prio=%d): Obtain %p..\n", num, \
+ proc_current()->link.pri, &s2); \
+ sem_obtain(&s2); \
+ kprintf("> test%d(prio=%d): Obtained %p.\n", num, \
+ proc_current()->link.pri, &s2); \
+ } \
+ \
+ start = timer_clock(); \
+ for (i = 0; i < loops * mult && (((unsigned)timer_clock()-start) <= loops*mult); i++) { \
+ local_count++; \
+ } \
+ \
+ sem_obtain(&sem); \
+ global_count += local_count; \
+ kprintf("> test%d(prio=%d): global_count=%u..\n", num, \
+ proc_current()->link.pri, global_count); \
+ sem_release(&sem); \
+ \
+ if (p_type == S2 || p_type == S1S2) { \
+ kprintf("> test%d(prio=%d): Release %p..\n", num, \
+ proc_current()->link.pri, &s2); \
+ sem_release(&s2); \
+ kprintf("> test%d(prio=%d): %p Released.\n", num, \
+ proc_current()->link.pri, &s2); \
+ } \
+ if (p_type == S1 || p_type == S1S2) { \
+ kprintf("> test%d(prio=%d): Release %p..\n", num, \
+ proc_current()->link.pri, &s1); \
+ sem_release(&s1); \
+ kprintf("> test%d(prio=%d): %p Released.\n", num, \
+ proc_current()->link.pri, &s1); \
+ } \
+ \
+ finishing_time[num-1] = timer_clock() - finishing_time[num-1]; \
+ kprintf("> test%d(prio=%d): Exit.\n", num, proc_current()->link.pri); \
+} \
+
+#define PROC_INV_TEST_INIT(num, pri, type) \
+do { \
+ struct Process *p; \
+ \
+ timer_delay(10); \
+ p = proc_new(proc_semInvTest##num, \
+ ((void*)type), sizeof(proc_sem_test##num##_stack), \
+ proc_sem_test##num##_stack); \
+ proc_setPri(p, pri); \
+} while (0) \
+
+// Define processes for the priority inversion test.
+PROC_INV_TEST(1)
+PROC_INV_TEST(2)
+PROC_INV_TEST(3)
+PROC_INV_TEST(4)
+PROC_INV_TEST(5)
+PROC_INV_TEST(6)
+PROC_INV_TEST(7)
+PROC_INV_TEST(8)
+
+#endif /* CONFIG_KERN_PRI */
+
+// Define process stacks for both of the tests.
PROC_TEST_STACK(1)
PROC_TEST_STACK(2)
PROC_TEST_STACK(3)
PROC_TEST_STACK(7)
PROC_TEST_STACK(8)
-/**
- * Run semaphore test
- */
-int sem_testRun(void)
+int sem_ser_test(void)
{
ticks_t start_time = timer_clock();
- kprintf("Run semaphore test..\n");
+ sem_init(&sem);
+ global_count = 0;
+
+ kprintf("Run semaphore serialization test..\n");
- //Init the process tests
+ // Initialize the processes.
PROC_TEST_INIT(1)
PROC_TEST_INIT(2)
PROC_TEST_INIT(3)
proc_yield();
}
- kputs("Semaphore Test fail..\n");
+ kputs("Semaphore serialization test failed..\n");
return -1;
}
-int sem_testSetup(void)
+#if CONFIG_KERN_PRI
+
+int sem_inv_test(void)
{
- kdbg_init();
+ int i, orig_pri = proc_current()->link.pri;
+ ticks_t fake, start_time;
- kprintf("Init Semaphore..");
sem_init(&sem);
- kprintf("Done.\n");
+ global_count = 0;
+ loops = 0;
+
+ sem_init(&s1);
+ sem_init(&s2);
+
+ kputs("> Main: calibration for the busy wait cycle..\n");
+ proc_setPri(proc_current(), 10);
+
+ fake = start_time = timer_clock();
+ while ((fake - start_time) < ms_to_ticks(BASETIME)) {
+ fake = timer_clock();
+ loops++;
+ }
+ kprintf("> Main: calibration done, %dms equals to %u cycles!\n", BASETIME, loops);
+
+ kputs("> Main: Run Priority Inversion test...\n");
+
+ // Will take s2
+ PROC_INV_TEST_INIT(1, 2, S2);
+
+ // 2 will block on s2; 3 will take s2 and still block on s2
+ PROC_INV_TEST_INIT(2, 3, S2);
+ PROC_INV_TEST_INIT(3, 4, S1S2);
+
+ // Will block on s1, nothing happens..
+ PROC_INV_TEST_INIT(4, 5, S1);
+
+ // No semaphore, without PI this will delay everyone!
+ PROC_INV_TEST_INIT(5, 6, NONE);
+
+ // Will block on s1 and boost
+ PROC_INV_TEST_INIT(6, 7, S1);
+ PROC_INV_TEST_INIT(7, 8, S1);
+ PROC_INV_TEST_INIT(8, 9, S1);
+
+ // All processes created, let them run.
+ proc_setPri(proc_current(), orig_pri);
+ while ((timer_clock() - start_time) < ms_to_ticks(TEST_TIME_OUT_MS*2)) {
+ if (sem_attempt(&sem)) {
+ if (global_count >= loops*7 + loops*5) {
+ for (i = 0; i < 8; i++)
+ kprintf("> Main: I-O latency of %d = %dms\n", i+1, ms_to_ticks(finishing_time[i]));
+ kputs("> Main: Test Finished..Ok!\n");
+ return 0;
+ }
+ sem_release(&sem);
+ }
+ proc_yield();
+ }
+
+ kputs("> Main: Priority Inversion Test failed..\n");
+ return -1;
+}
+
+#else
+
+void sem_inv_test(void)
+{
+}
+
+#endif /* CONFIG_KERN_PRI */
+
+/**
+ * Run semaphore test
+ */
+int sem_testRun(void)
+{
+ /* Start tests */
+ sem_ser_test(); // Serialization
+ sem_inv_test(); // Priority Inversion
+
+ return 0;
+}
+
+int sem_testSetup(void)
+{
+ kdbg_init();
kprintf("Init Timer..");
timer_init();
projects / bertos.git / commitdiff