1/*
2 * Copyright (c) 2002, Intel Corporation. All rights reserved.
3 * This file is licensed under the GPL license.  For the full content
4 * of this license, see the COPYING file at the top level of this
5 * source tree.
6
7 * Test that pthread_rwlock_timedrdlock(pthread_rwlock_t *rwlock)
8 *
9 *	Under no circumstances shall the function fail with a timeout if the lock can be
10 *	acquired immediately. The abs_timeout parameter need not be checked if the lock
11 *	can be immediately acquired.
12 *
13 * Steps:n
14 * 1.  Main thread create a thread.
15 * 2.  Child thread lock 'rwlock' for reading with pthread_rwlock_timedrdlock(),
16 *	should not fail with timeout
17 * 3.  The child thread unlocks the 'rwlock' and exits.
18 * 4.  Main thread create another thread.
19 * 4.  The child thread lock 'rwlock' for reading, with pthread_rwlock_timedrdlock(),
20 *	specifying a 'abs_timeout'. The thread sleeps until 'abs_timeout' expires.
21 * 5.  The thread call pthread_rwlock_timedrdlock(). Should _NOT_ get ETIMEDOUT.
22 */
23
24#define _XOPEN_SOURCE 600
25#include <pthread.h>
26#include <stdio.h>
27#include <stdlib.h>
28#include <unistd.h>
29#include <errno.h>
30#include "posixtest.h"
31
32#define NOT_CREATED_THREAD 1
33#define ENTERED_THREAD 2
34#define EXITING_THREAD 3
35
36#define TIMEOUT 1
37static int thread_state;
38static int currsec1;
39static int expired;
40
41static void* fn_rd_1(void *arg)
42{
43	thread_state = ENTERED_THREAD;
44	struct timespec abs_timeout;
45	int rc;
46	pthread_rwlock_t rwlock;
47
48	if(pthread_rwlock_init(&rwlock, NULL) != 0)
49	{
50		printf("thread1: Error at pthread_rwlock_init\n");
51		exit(PTS_UNRESOLVED);
52	}
53
54	currsec1 = time(NULL);
55
56	/* Absolute time, not relative. */
57	abs_timeout.tv_sec = currsec1 + TIMEOUT;
58	abs_timeout.tv_nsec = 0;
59
60	printf("thread1: attempt timed read-lock\n");
61	rc = pthread_rwlock_timedrdlock(&rwlock, &abs_timeout);
62	if(rc  == ETIMEDOUT)
63	{
64		printf("thread1: timed read-lock expired\n");
65		expired = 1;
66	}
67	else if(rc == 0)
68	{
69		printf("thread1: acquired read lock\n");
70		expired = 0;
71		printf("thread1: unlock read lock\n");
72		if(pthread_rwlock_unlock(&rwlock) != 0)
73		{
74			printf("thread1: failed to release read lock\n");
75			exit(PTS_UNRESOLVED);
76		}
77	}
78	else
79	{
80		printf("thread1: Error in pthread_rwlock_timedrdlock().\n");
81		exit(PTS_UNRESOLVED);
82	}
83
84	if(pthread_rwlock_destroy(&rwlock) != 0)
85	{
86		printf("thread1: Error at pthread_rwlockattr_destroy()");
87		exit(PTS_UNRESOLVED);
88	}
89	thread_state = EXITING_THREAD;
90	pthread_exit(0);
91	return NULL;
92}
93
94static void* fn_rd_2(void *arg)
95{
96	thread_state = ENTERED_THREAD;
97	struct timespec abs_timeout;
98	int rc;
99	pthread_rwlock_t rwlock;
100
101	if(pthread_rwlock_init(&rwlock, NULL) != 0)
102	{
103		printf("thread2: Error at pthread_rwlock_init\n");
104		exit(PTS_UNRESOLVED);
105	}
106	currsec1 = time(NULL);
107
108	/* Ensure that the abs_timeout has passed by _subtracting_ the timeout value of 1
109	 * from the current time. */
110	abs_timeout.tv_sec = currsec1 - TIMEOUT;
111	abs_timeout.tv_nsec = 0;
112
113	printf("thread2: attempt timed read-lock\n");
114	rc = pthread_rwlock_timedrdlock(&rwlock, &abs_timeout);
115	if(rc  == ETIMEDOUT)
116	{
117		printf("thread2: timed read-lock expired\n");
118		expired = 1;
119	}
120	else if(rc == 0)
121	{
122		printf("thread2: acquired read lock\n");
123		expired = 0;
124		printf("thread2: unlock read lock\n");
125		if(pthread_rwlock_unlock(&rwlock) != 0)
126		{
127			printf("thread2: failed to release read lock\n");
128			exit(PTS_UNRESOLVED);
129		}
130	}
131	else
132	{
133		printf("thread2: Error in pthread_rwlock_timedrdlock().\n");
134		exit(PTS_UNRESOLVED);
135	}
136
137	if(pthread_rwlock_destroy(&rwlock) != 0)
138	{
139		printf("thread2: Error at pthread_rwlockattr_destroy()\n");
140		exit(PTS_UNRESOLVED);
141	}
142	thread_state = EXITING_THREAD;
143	pthread_exit(0);
144	return NULL;
145}
146
147int main()
148{
149	int cnt = 0;
150
151	pthread_t thread1, thread2;
152
153	thread_state = NOT_CREATED_THREAD;
154	printf("main: create thread1\n");
155	if(pthread_create(&thread1, NULL, fn_rd_1, NULL) != 0)
156	{
157		printf("Error when creating thread1\n");
158		return PTS_UNRESOLVED;
159	}
160
161	/* If the shared data is not altered by child after 5 seconds,
162	   we regard it as blocked */
163
164	/* we expect thread1 NOT to block, but rather for the timed read-lock to expire */
165	cnt = 0;
166	do{
167		sleep(1);
168	}while (thread_state !=EXITING_THREAD && cnt++ < 5);
169
170	if(thread_state == EXITING_THREAD)
171	{
172		/* the child thread does not block, check the time expired or not */
173		if(expired == 1)
174		{
175			printf("Test FAILED: thread1 incorrectly received ETIMEDOUT\n");
176			return PTS_FAIL;
177		}
178	}
179	else if(thread_state == ENTERED_THREAD)
180	{
181		printf("Test FAILED: thread1 incorrectly blocked for reading rwlock\n");
182		return PTS_FAIL;
183	}
184	else
185	{
186		printf("Unexpected state for thread1 %d\n", thread_state);
187		return PTS_UNRESOLVED;
188	}
189
190	if(pthread_join(thread1, NULL) != 0)
191	{
192		printf("Error when joining thread1\n");
193		return PTS_UNRESOLVED;
194	}
195
196	printf("main: create thread2\n");
197	thread_state = NOT_CREATED_THREAD;
198	if(pthread_create(&thread2, NULL, fn_rd_2, NULL) != 0)
199	{
200		printf("Error when creating thread2\n");
201		return PTS_UNRESOLVED;
202	}
203
204	/* If the shared data is not altered by child after 5 seconds,
205	   we regard it as blocked */
206
207	/* we expect thread2 NOT to block */
208	cnt = 0;
209	do{
210		sleep(1);
211	}while (thread_state !=EXITING_THREAD && cnt++ < 5);
212
213	if(thread_state == EXITING_THREAD)
214	{
215		/* the child thread does not block, check the time expired or not */
216		if(expired == 1)
217		{
218			printf("Test FAILED: thread2 incorrectly received ETIMEDOUT\n");
219			return PTS_FAIL;
220		}
221	}
222	else if(thread_state == ENTERED_THREAD)
223	{
224		printf("Test FAILED: thread2 incorrectly blocked for reading rwlock\n");
225		return PTS_FAIL;
226	}
227	else
228	{
229		printf("Unexpected state for thread2 %d\n", thread_state);
230		return PTS_UNRESOLVED;
231	}
232
233	if(pthread_join(thread2, NULL) != 0)
234	{
235		printf("Error when join thread2\n");
236		return PTS_UNRESOLVED;
237	}
238
239	printf("Test PASSED\n");
240	return PTS_PASS;
241}
242