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/* Unit test for drd that triggers a race on the use of a POSIX condition
variable. By Bart Van Assche.
*/
#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* thread_arg);
// Local variables.
static pthread_mutex_t s_mutex;
static pthread_cond_t s_cond;
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,
"%s", name, 0, 0, 0);
}
int main(int argc, char** argv)
{
int optchar;
pthread_t threadid;
set_thread_name("main");
while ((optchar = getopt(argc, argv, "m")) != EOF)
{
switch (optchar)
{
case 'm':
s_use_mutex = 1;
break;
default:
assert(0);
}
}
pthread_cond_init(&s_cond, 0);
pthread_mutex_init(&s_mutex, 0);
pthread_mutex_lock(&s_mutex);
pthread_create(&threadid, 0, thread_func, 0);
pthread_cond_wait(&s_cond, &s_mutex);
pthread_mutex_unlock(&s_mutex);
pthread_join(threadid, 0);
pthread_mutex_destroy(&s_mutex);
pthread_cond_destroy(&s_cond);
return 0;
}
static void* thread_func(void* thread_arg)
{
set_thread_name("thread_func");
// Wait until the main thread has entered pthread_cond_wait().
pthread_mutex_lock(&s_mutex);
pthread_mutex_unlock(&s_mutex);
// Signal the condition variable.
if (s_use_mutex) pthread_mutex_lock(&s_mutex);
pthread_cond_signal(&s_cond);
if (s_use_mutex) pthread_mutex_unlock(&s_mutex);
return 0;
}
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