| /* |
| * 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; |
| } |