thr_detach.c revision 174112
113546Sjulian/* 213546Sjulian * Copyright (c) 1995 John Birrell <jb@cimlogic.com.au>. 313546Sjulian * All rights reserved. 413546Sjulian * 513546Sjulian * Redistribution and use in source and binary forms, with or without 613546Sjulian * modification, are permitted provided that the following conditions 713546Sjulian * are met: 813546Sjulian * 1. Redistributions of source code must retain the above copyright 913546Sjulian * notice, this list of conditions and the following disclaimer. 1013546Sjulian * 2. Redistributions in binary form must reproduce the above copyright 1113546Sjulian * notice, this list of conditions and the following disclaimer in the 1213546Sjulian * documentation and/or other materials provided with the distribution. 13165967Simp * 3. Neither the name of the author nor the names of any co-contributors 1413546Sjulian * may be used to endorse or promote products derived from this software 1513546Sjulian * without specific prior written permission. 1613546Sjulian * 1713546Sjulian * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND 1813546Sjulian * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 1913546Sjulian * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 2049439Sdeischen * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 2113546Sjulian * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 2213546Sjulian * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 2313546Sjulian * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 2413546Sjulian * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 2513546Sjulian * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 2613546Sjulian * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 2713546Sjulian * SUCH DAMAGE. 2813546Sjulian * 2950476Speter * $FreeBSD: head/lib/libkse/thread/thr_detach.c 174112 2007-11-30 17:20:29Z deischen $ 3013546Sjulian */ 31174112Sdeischen#include "namespace.h" 32113658Sdeischen#include <sys/types.h> 33113658Sdeischen#include <machine/atomic.h> 3413546Sjulian#include <errno.h> 3513546Sjulian#include <pthread.h> 36174112Sdeischen#include "un-namespace.h" 37103388Smini#include "thr_private.h" 3813546Sjulian 39156611SdeischenLT10_COMPAT_PRIVATE(_pthread_detach); 40156611SdeischenLT10_COMPAT_DEFAULT(pthread_detach); 41156611Sdeischen 4275369Sdeischen__weak_reference(_pthread_detach, pthread_detach); 4371581Sdeischen 4413546Sjulianint 4571581Sdeischen_pthread_detach(pthread_t pthread) 4613546Sjulian{ 47113661Sdeischen struct pthread *curthread = _get_curthread(); 48117907Sdeischen struct kse_mailbox *kmbx = NULL; 49113661Sdeischen struct pthread *joiner; 50113658Sdeischen int rval = 0; 5113546Sjulian 5213546Sjulian /* Check for invalid calling parameters: */ 53113658Sdeischen if (pthread == NULL || pthread->magic != THR_MAGIC) 5413546Sjulian /* Return an invalid argument error: */ 5531402Salex rval = EINVAL; 5635509Sjb 57113661Sdeischen else if ((rval = _thr_ref_add(curthread, pthread, 58113661Sdeischen /*include dead*/1)) != 0) { 59113661Sdeischen /* Return an error: */ 60113661Sdeischen } 61113661Sdeischen 62113658Sdeischen /* Check if the thread is already detached: */ 63113661Sdeischen else if ((pthread->attr.flags & PTHREAD_DETACHED) != 0) { 64113658Sdeischen /* Return an error: */ 65113661Sdeischen _thr_ref_delete(curthread, pthread); 66113658Sdeischen rval = EINVAL; 67113661Sdeischen } else { 68113658Sdeischen /* Lock the detached thread: */ 69113658Sdeischen THR_SCHED_LOCK(curthread, pthread); 70113658Sdeischen 7113546Sjulian /* Flag the thread as detached: */ 7213546Sjulian pthread->attr.flags |= PTHREAD_DETACHED; 7313546Sjulian 74113658Sdeischen /* Retrieve any joining thread and remove it: */ 75113658Sdeischen joiner = pthread->joiner; 76115278Sdeischen if ((joiner != NULL) && (joiner->kseg == pthread->kseg)) { 77113661Sdeischen /* 78113661Sdeischen * We already own the scheduler lock for the joiner. 79113661Sdeischen * Take advantage of that and make the joiner runnable. 80113661Sdeischen */ 81113661Sdeischen if (joiner->join_status.thread == pthread) { 82113661Sdeischen /* 83113661Sdeischen * Set the return value for the woken thread: 84113661Sdeischen */ 85113661Sdeischen joiner->join_status.error = ESRCH; 86113661Sdeischen joiner->join_status.ret = NULL; 87113661Sdeischen joiner->join_status.thread = NULL; 8844963Sjb 89117907Sdeischen kmbx = _thr_setrunnable_unlocked(joiner); 90113661Sdeischen } 91113661Sdeischen joiner = NULL; 92113661Sdeischen } 93113661Sdeischen THR_SCHED_UNLOCK(curthread, pthread); 94113658Sdeischen /* See if there is a thread waiting in pthread_join(): */ 95115278Sdeischen if ((joiner != NULL) && 96115278Sdeischen (_thr_ref_add(curthread, joiner, 0) == 0)) { 97113658Sdeischen /* Lock the joiner before fiddling with it. */ 98113658Sdeischen THR_SCHED_LOCK(curthread, joiner); 99113658Sdeischen if (joiner->join_status.thread == pthread) { 100113658Sdeischen /* 101113658Sdeischen * Set the return value for the woken thread: 102113658Sdeischen */ 103113658Sdeischen joiner->join_status.error = ESRCH; 104113658Sdeischen joiner->join_status.ret = NULL; 105113658Sdeischen joiner->join_status.thread = NULL; 10676909Sjasone 107117907Sdeischen kmbx = _thr_setrunnable_unlocked(joiner); 108113658Sdeischen } 109113658Sdeischen THR_SCHED_UNLOCK(curthread, joiner); 110114187Sdeischen _thr_ref_delete(curthread, joiner); 11113546Sjulian } 112115278Sdeischen _thr_ref_delete(curthread, pthread); 113117907Sdeischen if (kmbx != NULL) 114117907Sdeischen kse_wakeup(kmbx); 115113658Sdeischen } 11644963Sjb 11713546Sjulian /* Return the completion status: */ 11813546Sjulian return (rval); 11913546Sjulian} 120