| /* |
| * 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. After child thread spin for 2 seconds, send SIGALRM to it. |
| * 5. Child thread check its status in the signal handler. |
| */ |
| |
| #define _XOPEN_SOURCE 600 |
| #include <pthread.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <signal.h> |
| #include "posixtest.h" |
| |
| static pthread_spinlock_t spinlock; |
| volatile static int thread_state; |
| |
| #define NOT_CREATED_THREAD 1 |
| #define ENTERED_THREAD 2 |
| #define EXITING_THREAD 3 |
| #define GET_SPIN_LOCK 4 |
| |
| static void sig_handler() |
| { |
| /* Just return */ |
| pthread_exit(0); |
| return; |
| } |
| |
| static void* fn_chld(void *arg) |
| { |
| int rc = 0; |
| |
| struct sigaction act; |
| struct timespec ts; |
| thread_state = ENTERED_THREAD; |
| int cnt = 0; |
| |
| /* Unblock the SIGALRM signal for the thread */ |
| sigemptyset (&act.sa_mask); |
| sigaddset(&act.sa_mask, SIGALRM); |
| if (pthread_sigmask (SIG_UNBLOCK, &act.sa_mask, NULL)) |
| { |
| perror("thread: could not unblock SIGALRM\n"); |
| return (void *)PTS_UNRESOLVED; |
| } |
| |
| /* Set up child thread to handle SIGALRM */ |
| act.sa_flags = 0; |
| act.sa_handler = sig_handler; |
| sigfillset(&act.sa_mask); |
| sigaction(SIGALRM, &act, 0); |
| |
| printf("thread: send SIGALRM to me after 2 secs\n"); |
| alarm(2); |
| |
| printf("thread: attempt spin lock\n"); |
| rc = pthread_spin_lock(&spinlock); |
| if (rc != 0) |
| { |
| printf("Test FAILED: thread failed to get spin lock,error code:%d\n" , rc); |
| pthread_exit((void*)PTS_FAIL); |
| } |
| |
| printf("thread: acquired spin lock\n"); |
| |
| thread_state = GET_SPIN_LOCK; |
| /* Wait 10 seconds for SIGALRM to be sent */ |
| while (cnt++ < 10) |
| { |
| ts.tv_sec = 1; |
| ts.tv_nsec = 0; |
| nanosleep(&ts, NULL); |
| } |
| |
| /* Shouldn't get here. If we do, it means that SIGALRM wasn't sent/received */ |
| printf("Error in thread: SIGALRM was not received/sent correctly, timedout after 10 secs of waiting.\n"); |
| pthread_exit((void*)PTS_UNRESOLVED); |
| return NULL; |
| } |
| |
| int main() |
| { |
| pthread_t child_thread; |
| void *value_ptr; |
| struct sigaction sa; |
| |
| /* Block the SIGALRM signal for main thread */ |
| sigemptyset (&sa.sa_mask); |
| sigaddset(&sa.sa_mask, SIGALRM); |
| if (pthread_sigmask (SIG_BLOCK, &sa.sa_mask, NULL)) |
| { |
| perror("main: could not block SIGALRM\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| if (pthread_spin_init(&spinlock, PTHREAD_PROCESS_PRIVATE) != 0) |
| { |
| perror("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"); |
| |
| thread_state = NOT_CREATED_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; |
| } |
| |
| /* Wait for thread to end execution */ |
| if (pthread_join(child_thread, &value_ptr) != 0) |
| { |
| perror("Error in pthread_join()\n"); |
| return PTS_UNRESOLVED; |
| } |
| |
| /* Check the return value of the thread */ |
| if (thread_state == GET_SPIN_LOCK) |
| { |
| printf("Test FAILED: Child thread did not spin on spin lock when other thread holds the lock\n"); |
| exit(PTS_FAIL); |
| } |
| else if (thread_state == ENTERED_THREAD) |
| { |
| printf("thread: spins on spin lock\n"); |
| printf("Test PASSED\n"); |
| exit(PTS_PASS); |
| } |
| else |
| { |
| printf("Unexpected child thread state: %d\n", thread_state); |
| exit(PTS_UNRESOLVED); |
| } |
| } |