1/*
2* Copyright (c) 2005, Bull S.A..  All rights reserved.
3* Created by: Sebastien Decugis
4
5* This program is free software; you can redistribute it and/or modify it
6* under the terms of version 2 of the GNU General Public License as
7* published by the Free Software Foundation.
8*
9* This program is distributed in the hope that it would be useful, but
10* WITHOUT ANY WARRANTY; without even the implied warranty of
11* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12*
13* You should have received a copy of the GNU General Public License along
14* with this program; if not, write the Free Software Foundation, Inc., 59
15* Temple Place - Suite 330, Boston MA 02111-1307, USA.
16
17
18* This sample test aims to check the following assertion:
19*
20*  If the semaphore is locked, the sval value is set to 0 or to a negative
21* value representing the number of waiters for the semaphore.
22
23
24* The steps are:
25* -> init a semaphore (value = 0)
26* -> create a thread which waits for the semaphore
27* -> call sem_getvalue and check value of the semaphore
28* -> sem_post and destroy everything
29
30* The test fails if value is not as expected.
31
32*/
33
34
35/* We are testing conformance to IEEE Std 1003.1, 2003 Edition */
36#define _POSIX_C_SOURCE 200112L
37
38/******************************************************************************/
39/*************************** standard includes ********************************/
40/******************************************************************************/
41#include <pthread.h>
42#include <stdarg.h>
43#include <stdio.h>
44#include <stdlib.h>
45#include <string.h>
46#include <unistd.h>
47
48#include <semaphore.h>
49#include <errno.h>
50
51/******************************************************************************/
52/***************************   Test framework   *******************************/
53/******************************************************************************/
54#include "testfrmw.h"
55#include "testfrmw.c"
56/* This header is responsible for defining the following macros:
57 * UNRESOLVED(ret, descr);
58 *    where descr is a description of the error and ret is an int
59 *   (error code for example)
60 * FAILED(descr);
61 *    where descr is a short text saying why the test has failed.
62 * PASSED();
63 *    No parameter.
64 *
65 * Both three macros shall terminate the calling process.
66 * The testcase shall not terminate in any other maneer.
67 *
68 * The other file defines the functions
69 * void output_init()
70 * void output(char * string, ...)
71 *
72 * Those may be used to output information.
73 */
74
75/******************************************************************************/
76/**************************** Configuration ***********************************/
77/******************************************************************************/
78#ifndef VERBOSE
79#define VERBOSE 1
80#endif
81
82/******************************************************************************/
83/***************************    Test case   ***********************************/
84/******************************************************************************/
85
86void * threaded ( void * arg )
87{
88	int ret;
89
90	do
91	{
92		ret = sem_wait( arg );
93	}
94	while ( ( ret != 0 ) && ( errno == EINTR ) );
95
96	if ( ret != 0 )
97	{
98		UNRESOLVED( errno, "Failed to wait for the semaphore" );
99	}
100
101	return NULL;
102}
103
104
105/* The main test function. */
106int main( int argc, char * argv[] )
107{
108	int ret, val;
109	sem_t sem;
110	pthread_t th;
111
112	/* Initialize output */
113	output_init();
114
115	/* Initialize semaphore */
116	ret = sem_init( &sem, 0, 0 );
117
118	if ( ret != 0 )
119	{
120		UNRESOLVED( errno, "Failed to init semaphore" );
121	}
122
123	/* Create the thread */
124	ret = pthread_create( &th, NULL, threaded, &sem );
125
126	if ( ret != 0 )
127	{
128		UNRESOLVED( ret, "Failed to create the thread" );
129	}
130
131	/* Sleep 1 sec so the thread enters the sem_wait call */
132	sleep( 1 );
133
134	/* Check value */
135	ret = sem_getvalue( &sem, &val );
136
137	if ( ret != 0 )
138	{
139		UNRESOLVED( errno, "Failed to get semaphore value" );
140	}
141
142	if ( ( val != 0 ) && ( val != -1 ) )
143	{
144		output( "Val: %d\n", val );
145		FAILED( "Semaphore count is neither 0 nor # of waiting processes" );
146	}
147
148	/* Post the semaphore */
149	ret = sem_post( &sem );
150
151	if ( ret != 0 )
152	{
153		UNRESOLVED( errno, "Failed to post the semaphore" );
154	}
155
156	/* Join the thread */
157	ret = pthread_join( th, NULL );
158
159	if ( ret != 0 )
160	{
161		UNRESOLVED( ret, "Failed to join the thread" );
162	}
163
164
165	/* Destroy the semaphore */
166	ret = sem_destroy( &sem );
167
168	if ( ret != 0 )
169	{
170		UNRESOLVED( errno, "Failed to sem_destroy" );
171	}
172
173	/* Test passed */
174#if VERBOSE > 0
175
176	output( "Test passed\n" );
177
178#endif
179
180	PASSED;
181}
182
183
184