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/*
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* Copyright (c) 2003, Intel Corporation. All rights reserved.
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* Created by: crystal.xiong REMOVE-THIS AT intel DOT com
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* This file is licensed under the GPL license. For the full content
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* of this license, see the COPYING file at the top level of this
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* source tree.
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*/
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/* There are n TF threads, n is equal to the processors in the system minus
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* one. TFs are used to keep busy these CPUs, which have priority 3. A
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* TL thread with lower priority 1 is created, which locks a mutex and
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* does workload. A TB thread with higher priority 4 is created and try
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* to lock TL's mutex. A TP thread with priority 2 is created to reflect the
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* priority change of TL. Main thread has the highest priority 6, which will
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* control the running steps of those threads, including creating threads,
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* stopping threads. There is another thread to collect the sample data with
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* priority 5.
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*
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* Steps:
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* 1. Create n TF threads, n is equal to processors number minus one. TF
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* will do workload.
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* 2. Create 1 TP thread and do workload. The thread will keep running when
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* TL is created.
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* 3. Create 1 TL thread to lock a mutex. TL will get a chance to run
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* when TP sleep a wee bit in between.
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* 4. Create 1 TB thread to lock the mutex. TL's priority will boost to
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* TB's priority, which will cause TP having no chance to run.
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* 5. Set TB's prioirty to 1, TL's priority will decrease. So TP and TL
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* will keep working as before.
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* 6. Stop these threads.
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*
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* NOTE: Most of the code is ported from test-11 written by inkay.
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*/
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#warning "Contains Linux-isms that need fixing."
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#include <errno.h>
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#include <pthread.h>
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#include <sched.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include "test.h"
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#include "pitest.h"
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int cpus;
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pthread_mutex_t mutex;
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volatile int ts_stop = 0;
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volatile double base_time;
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struct thread_param {
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int index;
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volatile int stop;
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int sleep_ms;
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int priority;
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int policy;
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const char *name;
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int cpu;
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volatile unsigned futex;
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volatile unsigned should_stall;
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volatile unsigned progress;
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} tp[] = {
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{
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0, 0, 0, 1, SCHED_FIFO, "TL", 0, 0, 0, 0}, {
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1, 0, 200, 2, SCHED_FIFO, "TP", 0, 0, 0, 0}, {
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2, 0, 0, 3, SCHED_FIFO, "TF", 1, 0, 0, 0}, {
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3, 0, 0, 3, SCHED_FIFO, "TF", 2, 0, 0, 0}, {
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4, 0, 0, 3, SCHED_FIFO, "TF", 3, 0, 0, 0}, {
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5, 0, 0, 3, SCHED_FIFO, "TF", 4, 0, 0, 0}, {
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6, 0, 0, 3, SCHED_FIFO, "TF", 5, 0, 0, 0}, {
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7, 0, 0, 3, SCHED_FIFO, "TF", 6, 0, 0, 0}
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};
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volatile unsigned do_work_dummy;
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void do_work(unsigned granularity_top, volatile unsigned *progress)
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{
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unsigned granularity_cnt, i;
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unsigned top = 5 * 1000 * 1000;
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unsigned dummy = do_work_dummy;
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for (granularity_cnt = 0; granularity_cnt < granularity_top;
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granularity_cnt++) {
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for (i = 0; i < top; i++)
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dummy = i | dummy;
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(*progress)++;
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}
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return;
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}
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void *thread_fn(void *param)
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{
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struct thread_param *tp = param;
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struct timespec ts;
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int rc;
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unsigned long mask = 1 << tp->cpu;
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#if __linux__
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rc = sched_setaffinity(0, sizeof(mask), &mask);
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if (rc < 0) {
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EPRINTF("UNRESOLVED: Thread %s index %d: Can't set affinity: "
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"%d %s", tp->name, tp->index, rc, strerror(rc));
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exit(UNRESOLVED);
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}
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#endif
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test_set_priority(pthread_self(), SCHED_FIFO, tp->priority);
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DPRINTF(stderr, "Thread %s index %d: started\n", tp->name, tp->index);
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DPRINTF(stdout, "#EVENT %f Thread %s Started\n",
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seconds_read() - base_time, tp->name);
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tp->progress = 0;
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ts.tv_sec = 0;
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ts.tv_nsec = tp->sleep_ms * 1000 * 1000;
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while (!tp->stop) {
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do_work(5, &tp->progress);
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if (tp->sleep_ms == 0)
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continue;
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rc = nanosleep(&ts, NULL);
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if (rc < 0) {
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EPRINTF("UNRESOLVED: Thread %s %d: nanosleep returned "
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"%d %s", tp->name, tp->index, rc, strerror(rc));
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exit(UNRESOLVED);
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}
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}
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DPRINTF(stdout, "#EVENT %f Thread %s Started\n",
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seconds_read() - base_time, tp->name);
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return NULL;
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}
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void *thread_tl(void *param)
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{
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struct thread_param *tp = param;
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unsigned long mask = 1 << tp->cpu;
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int rc;
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#if __linux__
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rc = sched_setaffinity((pid_t) 0, sizeof(mask), &mask);
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if (rc < 0) {
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EPRINTF
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("UNRESOLVED: Thread %s index %d: Can't set affinity: %d %s",
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tp->name, tp->index, rc, strerror(rc));
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exit(UNRESOLVED);
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}
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#endif
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test_set_priority(pthread_self(), SCHED_FIFO, tp->priority);
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DPRINTF(stderr, "Thread %s index %d: started\n", tp->name, tp->index);
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DPRINTF(stdout, "#EVENT %f Thread %s Started\n",
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seconds_read() - base_time, tp->name);
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tp->progress = 0;
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pthread_mutex_lock(&mutex);
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while (!tp->stop) {
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do_work(5, &tp->progress);
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}
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pthread_mutex_unlock(&mutex);
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DPRINTF(stdout, "#EVENT %f Thread %s Stopted\n",
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seconds_read() - base_time, tp->name);
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return NULL;
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}
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void *thread_sample(void *arg)
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{
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char buffer[1024];
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struct timespec ts;
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double period = 250;
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size_t size;
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int i;
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int rc;
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test_set_priority(pthread_self(), SCHED_FIFO, 5);
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DPRINTF(stderr, "Thread Sampler: started\n");
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DPRINTF(stdout, "# COLUMNS %d Time TP TL ", 2 + cpus);
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for (i = 0; i < (cpus - 1); i++)
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DPRINTF(stdout, "TF%d ", i);
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DPRINTF(stdout, "\n");
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ts.tv_sec = 0;
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ts.tv_nsec = period * 1000 * 1000;
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while (!ts_stop) {
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size =
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snprintf(buffer, 1023, "%f ", seconds_read() - base_time);
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for (i = 0; i < cpus + 1; i++)
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size +=
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snprintf(buffer + size, 1023 - size, "%u ",
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tp[i].progress);
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DPRINTF(stdout, "%s\n", buffer);
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rc = nanosleep(&ts, NULL);
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if (rc < 0)
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EPRINTF("UNRESOLVED: Thread %s %d: nanosleep returned "
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"%d %s", tp->name, tp->index, rc, strerror(rc));
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}
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return NULL;
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}
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void *thread_tb(void *arg)
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{
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struct timespec boost_time;
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double t0, t1;
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int rc;
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test_set_priority(pthread_self(), SCHED_FIFO, 4);
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DPRINTF(stderr, "Thread TB: started\n");
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DPRINTF(stdout, "#EVENT %f TB Started, waiting for mutex for %lu s\n",
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seconds_read() - base_time, *(time_t *) arg);
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boost_time.tv_sec = time(NULL) + *(time_t *) arg;
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boost_time.tv_nsec = 0;
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t0 = seconds_read();
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rc = pthread_mutex_timedlock(&mutex, &boost_time);
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t1 = seconds_read();
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DPRINTF(stdout, "#EVENT %f TB Thread Waited for %.2f s\n",
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seconds_read() - base_time, t1 - t0);
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if (rc != ETIMEDOUT && rc != 0) {
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EPRINTF("FAIL: Thread TB: lock returned %d %s, "
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"slept %f", rc, strerror(rc), t1 - t0);
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exit(FAIL);
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}
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DPRINTF(stdout, "#EVENT %f TB Stopped\n", seconds_read() - base_time);
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return NULL;
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}
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int main(void)
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{
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cpus = sysconf(_SC_NPROCESSORS_ONLN);
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pthread_mutexattr_t mutex_attr;
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pthread_attr_t threadattr;
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pthread_t threads[cpus - 1], threadsample, threadtp, threadtl, threadtb;
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time_t multiplier = 1;
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int i;
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int rc;
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test_set_priority(pthread_self(), SCHED_FIFO, 6);
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base_time = seconds_read();
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/* Initialize a mutex with PTHREAD_PRIO_INHERIT protocol */
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mutex_attr_init(&mutex_attr);
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mutex_init(&mutex, &mutex_attr);
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/* Initialize thread attr */
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threadattr_init(&threadattr);
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/* Start the sample thread */
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DPRINTF(stderr, "Main Thread: Creating sample thread\n");
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rc = pthread_create(&threadsample, &threadattr, thread_sample, NULL);
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if (rc != 0) {
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EPRINTF("UNRESOLVED: pthread_create: %d %s", rc, strerror(rc));
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exit(UNRESOLVED);
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}
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/* Start the TF threads */
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DPRINTF(stderr, "Main Thread: Creating %d TF threads\n", cpus - 1);
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for (i = 0; i < cpus - 1; i++) {
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rc = pthread_create(&threads[i], &threadattr, thread_fn,
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&tp[i + 2]);
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if (rc != 0) {
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EPRINTF("UNRESOLVED: pthread_create: %d %s",
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rc, strerror(rc));
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exit(UNRESOLVED);
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}
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}
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sleep(base_time + multiplier * 10 - seconds_read());
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/* Start TP thread */
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DPRINTF(stderr, "Main Thread: Creating TP thread\n");
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rc = pthread_create(&threadtp, &threadattr, thread_fn, &tp[1]);
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if (rc != 0) {
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EPRINTF("UNRESOLVED: pthread_create: %d %s", rc, strerror(rc));
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exit(UNRESOLVED);
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}
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sleep(base_time + multiplier * 20 - seconds_read());
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/* Start TL thread */
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DPRINTF(stderr, "Main Thread: Creating TL thread\n");
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rc = pthread_create(&threadtl, &threadattr, thread_tl, &tp[0]);
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if (rc != 0) {
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EPRINTF("UNRESOLVED: pthread_create: %d %s", rc, strerror(rc));
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exit(UNRESOLVED);
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}
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sleep(base_time + multiplier * 30 - seconds_read());
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/* Start TB thread (boosting thread) */
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unsigned long timeout = multiplier * 20;
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rc = pthread_create(&threadtb, &threadattr, thread_tb, &timeout);
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if (rc != 0) {
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EPRINTF("UNRESOLVED: pthread_create: %d %s", rc, strerror(rc));
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exit(UNRESOLVED);
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}
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sleep(base_time + multiplier * 40 - seconds_read());
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/* Decrease TB's priority */
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DPRINTF(stderr, "Main Thread: decrease TB's priority to 1\n");
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test_set_priority(threadtb, SCHED_FIFO, 1);
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DPRINTF(stdout, "#EVENT %f TB's priority decreased\n",
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seconds_read() - base_time);
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sleep(base_time + multiplier * 60 - seconds_read());
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/* Stop TL thread */
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tp[0].stop = 1;
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sleep(base_time + multiplier * 70 - seconds_read());
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/* Stop TP thread */
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tp[1].stop = 1;
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sleep(base_time + multiplier * 80 - seconds_read());
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/* Stop TF threads */
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for (i = 2; i < cpus - 1; i++) {
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tp[i].stop = 1;
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}
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/* Stop sampler */
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ts_stop = 1;
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DPRINTF(stderr, "Main Thread: stop sampler thread\n");
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return 0;
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}
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