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/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University.
* Copyright (c) 1993,1994 The University of Utah and
* the Computer Systems Laboratory (CSL).
* All rights reserved.
*
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
*
* CARNEGIE MELLON, THE UNIVERSITY OF UTAH AND CSL ALLOW FREE USE OF
* THIS SOFTWARE IN ITS "AS IS" CONDITION, AND DISCLAIM ANY LIABILITY
* OF ANY KIND FOR ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF
* THIS SOFTWARE.
*
* Carnegie Mellon requests users of this software to return to
*
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
*
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
*/
/*
* File: ipc/ipc_thread.c
* Author: Rich Draves
* Date: 1989
*
* IPC operations on threads.
*/
#include <kern/assert.h>
#include <ipc/ipc_thread.h>
/*
* Routine: ipc_thread_enqueue
* Purpose:
* Enqueue a thread.
*/
void
ipc_thread_enqueue(
ipc_thread_queue_t queue,
ipc_thread_t thread)
{
ipc_thread_enqueue_macro(queue, thread);
}
/*
* Routine: ipc_thread_dequeue
* Purpose:
* Dequeue and return a thread.
*/
ipc_thread_t
ipc_thread_dequeue(
ipc_thread_queue_t queue)
{
ipc_thread_t first;
first = ipc_thread_queue_first(queue);
if (first != ITH_NULL)
ipc_thread_rmqueue_first_macro(queue, first);
return first;
}
/*
* Routine: ipc_thread_rmqueue
* Purpose:
* Pull a thread out of a queue.
*/
void
ipc_thread_rmqueue(
ipc_thread_queue_t queue,
ipc_thread_t thread)
{
ipc_thread_t next, prev;
assert(queue->ithq_base != ITH_NULL);
next = thread->ith_next;
prev = thread->ith_prev;
if (next == thread) {
assert(prev == thread);
assert(queue->ithq_base == thread);
queue->ithq_base = ITH_NULL;
} else {
if (queue->ithq_base == thread)
queue->ithq_base = next;
next->ith_prev = prev;
prev->ith_next = next;
ipc_thread_links_init(thread);
}
}
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