The pthread_create task initialization routine

The first routine that is given control in the new task when a thread is created with the pthread_create service is the pthread_create pthread-creating task initialization routine. (The pthread-creating task initialization routine is not the same as the initial pthread-creating task (IPT). The pthread-creating task initialization routine is the routine that is given control when a pthread_create is done, whereas the IPT refers to the task that the first task runs on.) The pthread_create pthread-creating task initialization routine does the following:

1. Acquires task-related resources required by the user application.
2. Calls pthread_exit_and_get service to exit the old thread and get the new thread information. The exit of the old thread is ignored if this is the first call to pthread_exit_and_get.
3. Checks for failures. If a failure is found, it skips to step 8.
4. Gets pthread-related resources for the newly created thread.
5. Calls the user-specified Start_routine.
6. Releases resources for the newly created thread.
7. Repeats step 2.
8. Releases task-related resources.
9. Returns to the caller (ends the task).