Sync to the latest version.

Can be broken or partially implemented.

src/thread_posix.c

@@ -20,17 +20,46 @@ static void *bh_thread_run(void *arg)
 int bh_thread_init(bh_thread_t *thread,
                    bh_task_t *task)
 {
+    thread->allocated = 0;
     return pthread_create(&thread->handle, NULL, bh_thread_run, task);
 }
 
+bh_thread_t *bh_thread_new(bh_task_t *task)
+{
+    bh_thread_t *result;
+
+    result = malloc(sizeof(*result));
+
+    if (result && bh_thread_init(result, task))
+    {
+        free(result);
+        result = NULL;
+    }
+
+    if (result)
+        result->allocated = 1;
+
+    return result;
+}
+
 int bh_thread_join(bh_thread_t *thread)
 {
-    return pthread_join(thread->handle, NULL);
+    int result = pthread_join(thread->handle, NULL);
+
+    if (thread->allocated)
+        free(thread);
+
+    return result;
 }
 
 int bh_thread_detach(bh_thread_t *thread)
 {
-    return pthread_detach(thread->handle);
+    int result = pthread_detach(thread->handle);
+
+    if (thread->allocated)
+        free(thread);
+
+    return result;
 }
 
 int bh_mutex_init(bh_mutex_t *mutex)