summaryrefslogtreecommitdiff
path: root/src/tests/dlt-test-multi-process.c
blob: d11cd1f55589cd1c0d7ab6a922b79c4903b5c1d6 (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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
/*
 * DLT multi process tester
 * @licence app begin@
 *
 * Copyright (C) 2011, BMW AG - Lassi Marttala Lassi Marttala <Lassi.LM.Marttala@partner.bmw.de>
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU Lesser General Public License, version 2.1, as published by the Free Software Foundation.
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even
 * the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
 * Public License, version 2.1, for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License, version 2.1, along
 * with this program; if not, see <http://www.gnu.org/licenses/lgpl-2.1.html>.
 *
 * Note that the copyright holders assume that the GNU Lesser General Public License, version 2.1, may
 * also be applicable to programs even in cases in which the program is not a library in the technical sense.
 *
 * Linking DLT statically or dynamically with other modules is making a combined work based on DLT. You may
 * license such other modules under the GNU Lesser General Public License, version 2.1. If you do not want to
 * license your linked modules under the GNU Lesser General Public License, version 2.1, you
 * may use the program under the following exception.
 *
 * As a special exception, the copyright holders of DLT give you permission to combine DLT
 * with software programs or libraries that are released under any license unless such a combination is not
 * permitted by the license of such a software program or library. You may copy and distribute such a
 * system following the terms of the GNU Lesser General Public License, version 2.1, including this
 * special exception, for DLT and the licenses of the other code concerned.
 *
 * Note that people who make modified versions of DLT are not obligated to grant this special exception
 * for their modified versions; it is their choice whether to do so. The GNU Lesser General Public License,
 * version 2.1, gives permission to release a modified version without this exception; this exception
 * also makes it possible to release a modified version which carries forward this exception.
 *
 * @licence end@
 */

/*******************************************************************************
**                                                                            **
**  SRC-MODULE: dlt-test-multi-process.c                                      **
**                                                                            **
**  TARGET    : linux                                                         **
**                                                                            **
**  PROJECT   : DLT                                                           **
**                                                                            **
**  AUTHOR    : Lassi Marttala Lassi.LM.Marttala@partner.bmw.de               **
**                                                                            **
**  PURPOSE   : Stress test timing using multiple processes                   **
**                                                                            **
**  REMARKS   : Requires POSIX fork()                                         **
**                                                                            **
**  PLATFORM DEPENDANT [yes/no]: yes                                          **
**                                                                            **
**  TO BE CHANGED BY USER [yes/no]: no                                        **
**                                                                            **
*******************************************************************************/
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>
#include <unistd.h>
#include <limits.h>
#include <signal.h>
#include <errno.h>
#include <pthread.h>
#include <sys/wait.h>

#include "dlt.h"
#include "dlt_common.h"
#include "dlt-test-multi-process.h"

// Constants
#define MAX_PROCS 100
#define MAX_THREADS 100

// Structs
typedef struct {
	int nmsgs;			// Number of messages to send
	int nprocs;			// Number of processes to start
	int nthreads;		// Number of threads to start
	int delay;			// Delay between logs messages for each process
	int delay_fudge;	// Fudge the delay by 0-n to cause desynchronization
} s_parameters;

typedef struct {
	s_parameters 	params;
	DltContext		ctx;
} s_thread_data;

// Forward declarations
void quit_handler(int signum);
void cleanup();
void do_forks(s_parameters params);
void run_threads(s_parameters params);
void do_logging(s_thread_data *data);
int wait_for_death();

// State information
volatile sig_atomic_t in_handler = 0;

// Globals for cleanup from main and signal handler
pid_t pids[MAX_PROCS];
int pidcount = 0;

/**
 * Print instructions.
 */
void usage(char *prog_name)
{
	char version[255];
	dlt_get_version(version);

	printf("Usage: %s [options]\n", prog_name);
	printf("Test application for stress testing the daemon with multiple processes and threads.\n");
	printf("%s\n", version);
	printf("Options:\n");
	printf(" -m number		Number of messages per thread to send.\n");
	printf(" -p number		Number of processes to start. Max %d.\n", MAX_PROCS);
	printf(" -t number		Number of threads per process. Max %d.\n", MAX_THREADS);
	printf(" -d delay		Delay in milliseconds to wait between log messages.\n");
	printf(" -f delay		Random fudge in milliseconds to add to delay.\n");
}

/**
 * Set nice default values for parameters
 */
void init_params(s_parameters * params) {
	params->nmsgs		= 100;
	params->nprocs		= 10;
	params->nthreads	= 2;
	params->delay		= 1000;
	params->delay_fudge	= 100;
}

/**
 * Read the command line and modify parameters
 */
int read_cli(s_parameters *params, int argc, char **argv)
{
	int c;
	opterr = 0;
    while ((c = getopt (argc, argv, "m:p:t:d:f:")) != -1)
	{
    	switch(c)
    	{
    		case 'm':
    			params->nmsgs		= atoi(optarg);
    			break;
    		case 'p':
				params->nprocs 		= atoi(optarg);
				if(params->nprocs > MAX_PROCS)
				{
					fprintf(stderr, "Too many processes selected.\n");
					return -1;
				}
				break;
			case 't':
				params->nthreads	= atoi(optarg);
				if(params->nprocs > MAX_PROCS)
				{
					fprintf(stderr, "Too many threads selected.\n");
					return -1;
				}
				break;
			case 'd':
				params->delay		= atoi(optarg);
				break;
			case 'f':
				params->delay_fudge	= atoi(optarg);
				break;
			case '?':
				if(optopt == 'n' || optopt == 'd' || optopt == 'f')
				{
					fprintf(stderr, "Option -%c requires an argument.\n", optopt);
				}
				else if(isprint(optopt))
				{
					fprintf(stderr, "Unknown option '-%c'.\n", optopt);
				}
				else
				{
					fprintf(stderr, "Unknown option character '\\x%x'.\n", optopt);
				}
				return -1;
				break;
			default:
				abort();
    	}
	}
	return 0;
}

/**
 * Entry point
 */
int main(int argc, char **argv)
{
	// Prepare parameters
	s_parameters params;
	init_params(&params);
	if(read_cli(&params, argc, argv) != 0) {
		usage(argv[0]);
		exit(-1);
	}

	// Launch the child processes
	do_forks(params);

	// Register signal handlers
	if(signal(SIGINT, quit_handler) == SIG_IGN)
		signal(SIGINT, SIG_IGN); 	// C-c
	if(signal(SIGHUP, quit_handler) == SIG_IGN)
		signal(SIGHUP, SIG_IGN); 	// Terminal closed
	if(signal(SIGTERM, quit_handler) == SIG_IGN)
		signal(SIGTERM, SIG_IGN); 	// kill (nice)

	printf("Setup done. Listening. My pid: %d\n", getpid());
	fflush(stdout);

	int err = wait_for_death();
	cleanup();
	return err;
}

/**
 * Start the child processes
 */

void do_forks(s_parameters params)
{
	int i;

	// Launch child processes
	for(i=0;i<params.nprocs;i++)
	{
		pid_t pid = fork();
		switch(pid)
		{
		case -1: // An error occured
			if(errno == EAGAIN)
			{
				fprintf(stderr, "Could not allocate resources for child process.\n");
				cleanup();
				abort();
			}
			if(errno == ENOMEM)
			{
				fprintf(stderr, "Could not allocate memory for child process' kernel structure.\n");
				cleanup();
				abort();
			}
		case 0: // Child process, start threads
			run_threads(params);
			break;
		default: // Parent process, store the childs pid
			pids[pidcount++] = pid;
			break;
		}
	}
}

/**
 * Clean up the child processes.
 * Reraise signal to default handler.
 */
void quit_handler(int signum)
{
	if(in_handler)
		raise(signum);
	in_handler = 1;

	cleanup();

	signal(signum, SIG_DFL);
	raise(signum);
}

/**
 * Ask the child processes to die
 */
void cleanup()
{
	int i;
	for(i=0;i<pidcount;i++)
	{
		kill(pids[i], SIGINT);
	}
}

/**
 * Generate the next sleep time
 */
time_t mksleep_time(int delay, int fudge)
{
	return (delay+rand()%fudge)*1000;
}

/**
 * Open logging channel and proceed to spam messages
 */
void do_logging(s_thread_data *data)
{
	//__asm__ ("int $0xCC");
	int msgs_left = data->params.nmsgs;
	pid_t mypid = getpid();


	srand(mypid);

	while(msgs_left-- > 0)
	{
		DLT_LOG(data->ctx, DLT_LOG_INFO, DLT_STRING(PAYLOAD_DATA));
		usleep(mksleep_time(data->params.delay, data->params.delay_fudge));
	}
}

/**
 * Start the threads and wait for them to return.
 */
void run_threads(s_parameters params)
{
	DltContext 		mycontext;
	pthread_t		thread[params.nthreads];
	s_thread_data	thread_data;
	char 			ctid[5];
	int 			i;

	srand(getpid());

	DLT_REGISTER_APP(DMPT_NAME,"DLT daemon multi process test.");
	sprintf(ctid,"%.2x", rand() & 0x0000ffff);
	DLT_REGISTER_CONTEXT(mycontext, ctid, "Child in dlt-test-multi-process");

	thread_data.params 	= params;
	thread_data.ctx		= mycontext;

	for(i=0;i<params.nthreads;i++)
	{
		if(pthread_create(&(thread[i]), NULL, (void *) &do_logging, &thread_data) != 0)
		{
			printf("Error creating thread.\n");
			abort();
		}
	}

	for(i=0;i<params.nthreads;i++)
	{
		pthread_join(thread[i], NULL);
	}

	DLT_UNREGISTER_CONTEXT(mycontext);
	DLT_UNREGISTER_APP();
	// We can exit now
	exit(0);
}

/**
 * Wait for child processes to complete their work.
 */
int wait_for_death()
{
	int pids_left = pidcount;
	while(pids_left > 0)
	{
		int status;
		pid_t w = waitpid(WAIT_ANY, &status, 0);
		if(status < 0)
		{
			return -1;
		}
		else
		{
			int i;
			for(i=0;i<pidcount;i++)
			{
				if(pids[i] == w)
				{
					pids_left--;
					break;
				}
			}
		}
	}
	return 0;
}