A CIL Tutorial - Department of Computer Science - ETH Zürich

CHAPTER 10. ADDING A NEW KIND OF STATEMENT 86
struct pthread_closure {
void *(*fn)(void *);
void *arg;
};
../ciltut-lib/src/tut10.c
static void *tfunc_wrapper(void *arg)
{
struct pthread_closure *c = (struct pthread_closure *)arg;
void *(*fn)(void *) = c->fn;
void *a
= c->arg;
void *res
= NULL;
free(c);
init_CS();
perf_init(gettid());
res = fn(a);
perf_deinit();
}
return res;
With the thread function wrapper set up in tfunc wrapper, we can now set up our version of
pthread create, which allocates a closure for the thread routine and its argument before making
the call to pthread create orig.
../ciltut-lib/src/tut10.c
int pthread_create(pthread_t *__restrict thread,
__const pthread_attr_t *__restrict attr,
void * (*start_routine)(void *),
void *__restrict arg)
{
struct pthread_closure *c = malloc(sizeof(struct pthread_closure));
int res;
c->fn = start_routine;
c->arg = arg;
res = pthread_create_orig(thread, attr, &tfunc_wrapper, c);
if (res != 0) {
printf("pthread failed\n");
fflush(stdout);
free(c);
}
return res;
}