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#include <stdio.h>
#include <string.h>
#include <cthreads.h>
#include <time.h>
#include <error.h>
#include "ddekit/thread.h"
#define DDEKIT_THREAD_STACK_SIZE 0x2000 /* 8 KB */
static struct ddekit_slab *ddekit_stack_slab = NULL;
struct ddekit_thread {
struct cthread thread;
};
static void setup_thread (cthread_t *t, const char *name) {
if (name) {
const char *cpy = NULL;
cpy = malloc (strlen (name) + 1);
if (cpy == NULL)
error (0, 0, "fail to allocate memory");
else
strcpy (cpy, name);
cthread_set_name (t, name);
}
/*
* ldata isn't used by cthread. Since cthread isn't exposed to
* the user of this library. It's very safe to store
* the condition variable in ldata.
*/
sleep_cond = condition_alloc ();
condition_init (sleep_cond);
cthread_set_ldata (t, sleep_cond);
}
ddekit_thread_t *ddekit_thread_setup_myself(const char *name) {
ddekit_thread_t *td = ddekit_thread_myself();
setup_thread (&td->thread, name);
return td;
}
ddekit_thread_t *ddekit_thread_create(void (*fun)(void *), void *arg, const char *name) {
ddekit_thread_t *td;
condition_t sleep_cond;
// TODO not very sure whether I should let the thread suspend
// before initialization is completed.
td = (ddekit_thread_t *) cthread_fork (fun, arg);
setup_thread (&td->thread, name);
return td;
}
ddekit_thread_t *ddekit_thread_myself(void) {
return (ddekit_thread_t *) cthread_self ();
}
void ddekit_thread_set_data(ddekit_thread_t *thread, void *data) {
// TODO not very sure whether I should call cthread_set_ldata
// or cthread_set_data.
cthread_set_data ((cthread_t) thread, data);
}
void ddekit_thread_set_my_data(void *data) {
ddekit_thread_set_data(ddekit_thread_myself(), data);
}
void *ddekit_thread_get_data(ddekit_thread_t *thread) {
return cthread_data ((cthread_t) thread);
}
void *ddekit_thread_get_my_data() {
return ddekit_thread_get_data(ddekit_thread_myself());
}
void ddekit_thread_msleep(unsigned long msecs) {
int ret;
struct timespec rgt;
rgt.tv_sec = (time_t) (msecs / 1000);
rgt.tv_nsec = (msecs % 1000) * 1000 * 1000;
ret = nanosleep (&rgt , NULL);
if (ret < 0)
error (0, errno, "nanosleep");
}
void ddekit_thread_usleep(unsigned long usecs) {
int ret;
struct timespec rgt;
rgt.tv_sec = (time_t) (usecs / 1000 / 1000);
rgt.tv_nsec = (usecs % (1000 * 1000)) * 1000;
ret = nanosleep (&rgt , NULL);
if (ret < 0)
error (0, errno, "nanosleep");
}
void ddekit_thread_nsleep(unsigned long nsecs) {
int ret;
struct timespec rgt;
rgt.tv_sec = (time_t) (nsecs / 1000 / 1000 / 1000);
rgt.tv_nsec = nsecs % (1000 * 1000 * 1000);
ret = nanosleep (&rgt , NULL);
if (ret < 0)
error (0, errno, "nanosleep");
}
void ddekit_thread_sleep(ddekit_lock_t *lock) {
ddekit_thread_t *td;
condition_t sleep_cond;
td = ddekit_thread_myself();
sleep_cond = ddekit_thread_get_data (&td->thread);
mutex_lock (lock);
// TODO condition_wait cannot guarantee that the thread is
// woke up by another thread, maybe by signals.
// Does it matter here?
condition_wait (sleep_cond, lock);
mutex_unlock (lock);
}
void ddekit_thread_wakeup(ddekit_thread_t *td) {
ddekit_thread_t *td;
condition_t sleep_cond;
td = ddekit_thread_myself();
sleep_cond = ddekit_thread_get_data (&td->thread);
condition_signal (sleep_cond);
}
void ddekit_thread_exit() {
const char *name;
condition_t sleep_cond;
cthread_t t = cthread_self ();
// TODO I hope I don't need a lock to protect ldata and name.
/* I have to free the sleep condition variable
* before the thread exits. */
sleep_cond = cthread_ldata (t);
cthread_set_ldata (t, NULL);
condition_free (sleep_cond);
name = cthread_name (t);
cthread_set_name (t, NULL);
free (name);
cthread_exit (0);
}
const char *ddekit_thread_get_name(ddekit_thread_t *thread) {
return cthread_name ((cthread_t) thread);
}
void ddekit_thread_schedule(void)
{
cthread_yield();
}
void ddekit_yield(void)
{
cthread_yield();
}
void ddekit_init_threads() {
// TODO maybe the name has already been set.
cthread_set_name (cthread_self (), "main");
}
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