bsd/kern/kern_fork.c

112 #include <kern/thread.h>
219  *		has its task, thread, and uthread lent to the child process,
226  *		operations on the task, thread, or uthread will result in
228  *		state, when a task, thread, and uthread are realized for the
286 		 * rather than returning the actual thread.  We can remove
336  *					borrow the parent task, thread, and
344  *		At first it may seem strange that we return the child thread
411 		 * child and the tash/thread/uthread from the parent in
492 		/* temporarily drop thread-set-id state */
498 		/* blow thread state information */
533 			/* Failed to create thread */
538 		/* copy current thread state into the child thread (only for fork) */
578 		 * Blow thread state information; this is what gives the child
594 		 * and thread state and address spaces of their parent process.
654 	/* return the thread pointer to the caller */
680  * Description:	"Return" to parent vfork thread() following execve/_exit;
682  *		with the task, thread, and uthread.
712 	/* restore thread-set-id state */
753  *		It creates a new task and thread (and as a side effect of the
754  *		thread creation, a uthread), which is then associated with the
809 	/* Create a new thread for the child process */
818 	 * Tag thread as being the first thread in its task.
844  *		extra Mach task and thread reference, for which the thread
849  *		thread state structure of the new child, and does not
854  *		After resuming the thread, this function returns directly to
922  * Returns:	!NULL			pointer to new child thread
956 		 * Failed to create thread; now we must deconstruct the new
1218 	 * Note that if the current thread has an assumed identity, this
1257 	 * there is a per-thread current working directory, set the childs
1420 uthread_alloc(task_t task, thread_t thread, int noinherit)
1436 	uth->uu_thread = thread;
1439 	 * Thread inherits credential from the creating thread, if both
1442 	 * If the creating thread has no credential or is from another
1443 	 * task we can leave the new thread credential NULL.  If it needs
1451 		 * XXX The new thread is, in theory, being created in context
1452 		 * XXX of parent thread, so a direct reference to the parent
1481 		uth->uu_context.vc_thread = thread;
1516 		 * no need to throttle this thread since its going away
1520 		 * still inuse by the thread.
1525 	 * Per-thread audit state should never last beyond system
1526 	 * call return.  Since we don't audit the thread creation/
1527 	 * removal, the thread state pointer should never be
1564 		 * Remove the thread from the process list and
1600 /* This routine frees the uthread structure held in thread structure */