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/*
This file is part of drd, a data race detector.
Copyright (C) 2006-2007 Bart Van Assche
bart.vanassche@gmail.com
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
// Test data race detection between floating point variables.
#include <assert.h>
#include <stdio.h> // printf()
#include <pthread.h>
#include <unistd.h> // usleep()
#include "../drd_clientreq.h"
// Local functions declarations.
static void* thread_func(void*);
// Local variables.
// s_mutex protects s_d3.
static pthread_mutex_t s_mutex;
static double s_d1; // accessed before thread creation and in the created
// thread (not a race).
static double s_d2; // accessed in the created thread and after the join
// (not a race).
static double s_d3; // accessed simultaneously from both threads (race).
static int s_debug = 0;
static int s_do_printf = 0;
static int s_use_mutex = 0;
// Function definitions.
static void set_thread_name(const char* const name)
{
int res;
VALGRIND_DO_CLIENT_REQUEST(res, 0, VG_USERREQ__SET_THREAD_NAME,
name, 0, 0, 0, 0);
}
int main(int argc, char** argv)
{
int optchar;
pthread_t threadid;
set_thread_name("main");
while ((optchar = getopt(argc, argv, "dmp")) != EOF)
{
switch (optchar)
{
case 'd':
s_debug = 1;
break;
case 'm':
s_use_mutex = 1;
break;
case 'p':
s_do_printf = 1;
break;
default:
assert(0);
}
}
pthread_mutex_init(&s_mutex, 0);
// Switch to line-buffered mode, such that timing information can be
// obtained for each printf() call with strace.
setlinebuf(stdout);
if (s_debug)
{
printf("&s_d1 = %p; &s_d2 = %p; &s_d3 = %p\n", &s_d1, &s_d2, &s_d3);
}
s_d1 = 1;
s_d3 = 3;
pthread_create(&threadid, 0, thread_func, 0);
// Wait until the printf() in the created thread finished.
{
if (s_use_mutex) pthread_mutex_lock(&s_mutex);
s_d3++;
if (s_use_mutex) pthread_mutex_unlock(&s_mutex);
}
// Wait until the thread finished.
//printf("Before call to pthread_join()\n");
//fflush(stdout);
pthread_join(threadid, 0);
//printf("After call to pthread_join()\n");
//fflush(stdout);
if (s_do_printf) printf("s_d2 = %g (should be 2)\n", s_d2);
if (s_do_printf) printf("s_d3 = %g (should be 5)\n", s_d3);
pthread_mutex_destroy(&s_mutex);
return 0;
}
static void* thread_func(void* thread_arg)
{
set_thread_name("thread_func");
if (s_do_printf)
{
printf("s_d1 = %g (should be 1)\n", s_d1);
}
s_d2 = 2;
{
if (s_use_mutex) pthread_mutex_lock(&s_mutex);
s_d3++;
if (s_use_mutex) pthread_mutex_unlock(&s_mutex);
}
return 0;
}
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