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/*
* Copyright (c) 2002, Intel Corporation. All rights reserved.
* This file is licensed under the GPL license. For the full content
* of this license, see the COPYING file at the top level of this
* source tree.
* Test pthread_spin_lock(pthread_spinlock_t *lock)
*
* The function shall lock the spin lock referenced by lock. The calling thread
* shall acquire the lock if it is not held by another thread. Otherwise, the
* thread shall spin (that is, shall not return from the pthread_spin_lock())
* until the lock becomes available.
*
* Steps:
* 1. Initialize a pthread_spinlock_t object 'spinlock' with
* pthread_spin_init()
* 2. Main thread lock 'spinlock', should get the lock
* 3. Create a child thread. The thread lock 'spinlock', should spin.
* 4. Main thread unlock 'spinlock'
* 5. Child thread should get 'spinlock'
*/
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include "posixtest.h"
static pthread_spinlock_t spinlock;
static volatile int thread_state;
#define NOT_CREATED_THREAD 1
#define ENTERED_THREAD 2
#define EXITING_THREAD 3
static void *fn_chld(void *arg)
{
int rc = 0;
thread_state = ENTERED_THREAD;
(void) arg;
/* Lock the spinlock */
printf("thread: attempt spin lock\n");
rc = pthread_spin_lock(&spinlock);
if (rc != 0) {
printf
("Test FAILED: child failed to get spin lock,error code:%d\n",
rc);
exit(PTS_FAIL);
}
printf("thread: acquired spin lock\n");
/* Just some time between locking and unlocking */
sleep(1);
/* Unlock the spin lock */
printf("thread: unlock spin lock\n");
if (pthread_spin_unlock(&spinlock)) {
printf("child: Error at pthread_spin_unlock()\n");
exit(PTS_UNRESOLVED);
}
thread_state = EXITING_THREAD;
pthread_exit(0);
return NULL;
}
int main(void)
{
int cnt = 0;
pthread_t child_thread;
/* Initialize spinlock */
if (pthread_spin_init(&spinlock, PTHREAD_PROCESS_PRIVATE) != 0) {
printf("main: Error at pthread_spin_init()\n");
return PTS_UNRESOLVED;
}
printf("main: attempt spin lock\n");
/* We should get the lock */
if (pthread_spin_lock(&spinlock) != 0) {
printf
("Test FAILED: main cannot get spin lock when no one owns the lock\n");
return PTS_FAIL;
}
printf("main: acquired spin lock\n");
/* Initialize thread state */
thread_state = NOT_CREATED_THREAD;
/* Create thread */
printf("main: create thread\n");
if (pthread_create(&child_thread, NULL, fn_chld, NULL) != 0) {
printf("main: Error creating child thread\n");
return PTS_UNRESOLVED;
}
cnt = 0;
/* Expect the child thread to spin on spin lock. Wait for 3 seconds. */
do {
sleep(1);
} while (thread_state != EXITING_THREAD && cnt++ < 3);
if (thread_state == EXITING_THREAD) {
printf
("Test FAILED: child thread did not spin on spin lock when other thread holds the lock\n");
return PTS_FAIL;
} else if (thread_state != ENTERED_THREAD) {
printf("main: Unexpected thread state %d\n", thread_state);
return PTS_UNRESOLVED;
}
printf("main: unlock spin lock\n");
if (pthread_spin_unlock(&spinlock) != 0) {
printf("main: Error at pthread_spin_unlock()\n");
return PTS_UNRESOLVED;
}
/* We expected the child get the spin lock and exit */
cnt = 0;
do {
sleep(1);
} while (thread_state != EXITING_THREAD && cnt++ < 3);
if (thread_state == ENTERED_THREAD) {
printf("Test FAILED: child thread did not get spin lock\n");
return PTS_FAIL;
} else if (thread_state != EXITING_THREAD) {
printf("main: Unexpected thread state %d\n", thread_state);
return PTS_UNRESOLVED;
}
/* Wait for thread to finish execution */
if (pthread_join(child_thread, NULL) != 0) {
printf("main: Error at pthread_join()\n");
return PTS_UNRESOLVED;
}
/* Destroy the spinlock */
if (pthread_spin_destroy(&spinlock) != 0) {
printf("Error at pthread_spin_destroy()");
return PTS_UNRESOLVED;
}
printf("Test PASSED\n");
return PTS_PASS;
}
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