1/*
2 * pthread_detach.c
3 *
4 * Description:
5 * This translation unit implements functions related to thread
6 * synchronisation.
7 *
8 * --------------------------------------------------------------------------
9 *
10 *      Pthreads-win32 - POSIX Threads Library for Win32
11 *      Copyright(C) 1998 John E. Bossom
12 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
13 *
14 *      Contact Email: rpj@callisto.canberra.edu.au
15 *
16 *      The current list of contributors is contained
17 *      in the file CONTRIBUTORS included with the source
18 *      code distribution. The list can also be seen at the
19 *      following World Wide Web location:
20 *      http://sources.redhat.com/pthreads-win32/contributors.html
21 *
22 *      This library is free software; you can redistribute it and/or
23 *      modify it under the terms of the GNU Lesser General Public
24 *      License as published by the Free Software Foundation; either
25 *      version 2 of the License, or (at your option) any later version.
26 *
27 *      This library is distributed in the hope that it will be useful,
28 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
29 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
30 *      Lesser General Public License for more details.
31 *
32 *      You should have received a copy of the GNU Lesser General Public
33 *      License along with this library in the file COPYING.LIB;
34 *      if not, write to the Free Software Foundation, Inc.,
35 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
36 */
37
38#include "pthread.h"
39#include "implement.h"
40
41/*
42 * Not needed yet, but defining it should indicate clashes with build target
43 * environment that should be fixed.
44 */
45#if !defined(WINCE)
46#  include <signal.h>
47#endif
48
49
50int
51pthread_detach (pthread_t thread)
52     /*
53      * ------------------------------------------------------
54      * DOCPUBLIC
55      *      This function detaches the given thread.
56      *
57      * PARAMETERS
58      *      thread
59      *              an instance of a pthread_t
60      *
61      *
62      * DESCRIPTION
63      *      This function detaches the given thread. You may use it to
64      *      detach the main thread or to detach a joinable thread.
65      *      NOTE:   detached threads cannot be joined;
66      *              storage is freed immediately on termination.
67      *
68      * RESULTS
69      *              0               successfully detached the thread,
70      *              EINVAL          thread is not a joinable thread,
71      *              ENOSPC          a required resource has been exhausted,
72      *              ESRCH           no thread could be found for 'thread',
73      *
74      * ------------------------------------------------------
75      */
76{
77  int result;
78  BOOL destroyIt = PTW32_FALSE;
79  ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
80  ptw32_mcs_local_node_t node;
81
82  ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
83
84  if (NULL == tp
85      || thread.x != tp->ptHandle.x)
86    {
87      result = ESRCH;
88    }
89  else if (PTHREAD_CREATE_DETACHED == tp->detachState)
90    {
91      result = EINVAL;
92    }
93  else
94    {
95      ptw32_mcs_local_node_t stateLock;
96      /*
97       * Joinable ptw32_thread_t structs are not scavenged until
98       * a join or detach is done. The thread may have exited already,
99       * but all of the state and locks etc are still there.
100       */
101      result = 0;
102
103      ptw32_mcs_lock_acquire (&tp->stateLock, &stateLock);
104      if (tp->state != PThreadStateLast)
105        {
106          tp->detachState = PTHREAD_CREATE_DETACHED;
107        }
108      else if (tp->detachState != PTHREAD_CREATE_DETACHED)
109        {
110          /*
111           * Thread is joinable and has exited or is exiting.
112           */
113          destroyIt = PTW32_TRUE;
114        }
115      ptw32_mcs_lock_release (&stateLock);
116    }
117
118  ptw32_mcs_lock_release(&node);
119
120  if (result == 0)
121    {
122      /* Thread is joinable */
123
124      if (destroyIt)
125	{
126	  /* The thread has exited or is exiting but has not been joined or
127	   * detached. Need to wait in case it's still exiting.
128	   */
129	  (void) WaitForSingleObject(tp->threadH, INFINITE);
130	  ptw32_threadDestroy (thread);
131	}
132    }
133
134  return (result);
135
136}				/* pthread_detach */
137