summaryrefslogtreecommitdiffstats
path: root/nsprpub/pr/tests/sem.c
blob: ec7bb6e2c6e10ee5e9b7c40e3437068b5d8dc396 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/***********************************************************************
**
** Name: sem.c
**
** Description: Tests Semaphonre functions.
**
** Modification History:
** 20-May-97 AGarcia- Converted the test to accomodate the debug_mode flag.
**	         The debug mode will print all of the printfs associated with this test.
**			 The regress mode will be the default mode. Since the regress tool limits
**           the output to a one line status:PASS or FAIL,all of the printf statements
**			 have been handled with an if (debug_mode) statement.
** 04-June-97 AGarcia removed the Test_Result function. Regress tool has been updated to
**			recognize the return code from tha main program.
***********************************************************************/

/***********************************************************************
** Includes
***********************************************************************/
/* Used to get the command line option */
#include "plgetopt.h"

#include "nspr.h"
#include "prpriv.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

PRIntn failed_already=0;
PRIntn debug_mode;

/* 
	Since we don't have stdin, stdout everywhere, we will fake 
	it with our in-memory buffers called stdin and stdout.
*/

#define SBSIZE 1024

#include "obsolete/prsem.h"

static char stdinBuf[SBSIZE];
static char stdoutBuf[SBSIZE];

static PRUintn stdinBufIdx = 0;
static PRUintn stdoutBufIdx = 0;
static PRStatus finalResult = PR_SUCCESS;


static size_t dread (PRUintn device, char *buf, size_t bufSize)
{
	PRUintn	i;
	
	/* during first read call, initialize the stdinBuf buffer*/
	if (stdinBufIdx == 0) {
		for (i=0; i<SBSIZE; i++)
			stdinBuf[i] = i;
	}

	/* now copy data from stdinBuf to the given buffer upto bufSize */
	for (i=0; i<bufSize; i++) {
		if (stdinBufIdx == SBSIZE)
			break;
		buf[i] = stdinBuf[stdinBufIdx++];
	}

	return i;
}

static size_t dwrite (PRUintn device, char *buf, size_t bufSize)
{
	PRUintn	i, j;
	
	/* copy data from the given buffer upto bufSize to stdoutBuf */
	for (i=0; i<bufSize; i++) {
		if (stdoutBufIdx == SBSIZE)
			break;
		stdoutBuf[stdoutBufIdx++] = buf[i];
	}

	/* during last write call, compare the two buffers */
	if (stdoutBufIdx == SBSIZE)
		for (j=0; j<SBSIZE; j++)
			if (stdinBuf[j] != stdoutBuf[j]) {
				if (debug_mode) printf("data mismatch for index= %d \n", j);
				finalResult = PR_FAILURE;
			}

	return i;
}

/*------------------ Following is the real test program ---------*/
/*
	Program to copy standard input to standard output.  The program
	uses two threads.  One reads the input and puts the data in a 
	double buffer.  The other reads the buffer contents and writes 
	it to standard output.
*/

PRSemaphore	*emptyBufs;	/* number of empty buffers */
PRSemaphore *fullBufs;	/* number of buffers that are full */

#define BSIZE	100

struct {
	char data[BSIZE];
	PRUintn nbytes;		/* number of bytes in this buffer */
} buf[2];

static void PR_CALLBACK reader(void *arg)
{
	PRUintn	i = 0;
	size_t	nbytes;
	
	do {
		(void) PR_WaitSem(emptyBufs);
		nbytes = dread(0, buf[i].data, BSIZE);
		buf[i].nbytes = nbytes;
		PR_PostSem(fullBufs);
		i = (i + 1) % 2;
	} while (nbytes > 0);
}

static void writer(void)
{
	PRUintn	i = 0;
	size_t	nbytes;
	
	do {
		(void) PR_WaitSem(fullBufs);
		nbytes = buf[i].nbytes;
		if (nbytes > 0) {
			nbytes = dwrite(1, buf[i].data, nbytes);
			PR_PostSem(emptyBufs);
			i = (i + 1) % 2;
		}
	} while (nbytes > 0);
}

int main(int argc, char **argv)
{
	PRThread *r;

    PR_STDIO_INIT();
    PR_Init(PR_USER_THREAD, PR_PRIORITY_NORMAL, 0);

    {
    	/* The command line argument: -d is used to determine if the test is being run
    	in debug mode. The regress tool requires only one line output:PASS or FAIL.
    	All of the printfs associated with this test has been handled with a if (debug_mode)
    	test.
    	Usage: test_name -d
    	*/
    	PLOptStatus os;
    	PLOptState *opt = PL_CreateOptState(argc, argv, "d:");
    	while (PL_OPT_EOL != (os = PL_GetNextOpt(opt)))
        {
    		if (PL_OPT_BAD == os) continue;
            switch (opt->option)
            {
            case 'd':  /* debug mode */
    			debug_mode = 1;
                break;
             default:
                break;
            }
        }
    	PL_DestroyOptState(opt);
    }        

 /* main test */

    emptyBufs = PR_NewSem(2);	/* two empty buffers */

    fullBufs = PR_NewSem(0);	/* zero full buffers */

	/* create the reader thread */
	
	r = PR_CreateThread(PR_USER_THREAD,
				      reader, 0, 
				      PR_PRIORITY_NORMAL,
				      PR_LOCAL_THREAD,
    				  PR_UNJOINABLE_THREAD,
				      0);

	/* Do the writer operation in this thread */
	writer();

	PR_DestroySem(emptyBufs);
	PR_DestroySem(fullBufs);

	if (finalResult == PR_SUCCESS) {
		if (debug_mode) printf("sem Test Passed.\n");
	}
	else{
		if (debug_mode) printf("sem Test Failed.\n");
		failed_already=1;
	}
    PR_Cleanup();
	if(failed_already)	
		return 1;
	else
		return 0;
}