1/*
2 * pthread_testcancel.c
3 *
4 * Description:
5 * POSIX thread functions related to thread cancellation.
6 *
7 * --------------------------------------------------------------------------
8 *
9 *      Pthreads-win32 - POSIX Threads Library for Win32
10 *      Copyright(C) 1998 John E. Bossom
11 *      Copyright(C) 1999,2005 Pthreads-win32 contributors
12 *
13 *      Contact Email: rpj@callisto.canberra.edu.au
14 *
15 *      The current list of contributors is contained
16 *      in the file CONTRIBUTORS included with the source
17 *      code distribution. The list can also be seen at the
18 *      following World Wide Web location:
19 *      http://sources.redhat.com/pthreads-win32/contributors.html
20 *
21 *      This library is free software; you can redistribute it and/or
22 *      modify it under the terms of the GNU Lesser General Public
23 *      License as published by the Free Software Foundation; either
24 *      version 2 of the License, or (at your option) any later version.
25 *
26 *      This library is distributed in the hope that it will be useful,
27 *      but WITHOUT ANY WARRANTY; without even the implied warranty of
28 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
29 *      Lesser General Public License for more details.
30 *
31 *      You should have received a copy of the GNU Lesser General Public
32 *      License along with this library in the file COPYING.LIB;
33 *      if not, write to the Free Software Foundation, Inc.,
34 *      59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
35 */
36
37#include "pthread.h"
38#include "implement.h"
39
40
41void
42pthread_testcancel (void)
43     /*
44      * ------------------------------------------------------
45      * DOCPUBLIC
46      *      This function creates a deferred cancellation point
47      *      in the calling thread. The call has no effect if the
48      *      current cancelability state is
49      *              PTHREAD_CANCEL_DISABLE
50      *
51      * PARAMETERS
52      *      N/A
53      *
54      *
55      * DESCRIPTION
56      *      This function creates a deferred cancellation point
57      *      in the calling thread. The call has no effect if the
58      *      current cancelability state is
59      *              PTHREAD_CANCEL_DISABLE
60      *
61      *      NOTES:
62      *      1)      Cancellation is asynchronous. Use pthread_join
63      *              to wait for termination of thread if necessary
64      *
65      * RESULTS
66      *              N/A
67      *
68      * ------------------------------------------------------
69      */
70{
71  ptw32_mcs_local_node_t stateLock;
72  pthread_t self = pthread_self ();
73  ptw32_thread_t * sp = (ptw32_thread_t *) self.p;
74
75  if (sp == NULL)
76    {
77      return;
78    }
79
80  /*
81   * Pthread_cancel() will have set sp->state to PThreadStateCancelPending
82   * and set an event, so no need to enter kernel space if
83   * sp->state != PThreadStateCancelPending - that only slows us down.
84   */
85  if (sp->state != PThreadStateCancelPending)
86    {
87      return;
88    }
89
90  ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
91
92  if (sp->cancelState != PTHREAD_CANCEL_DISABLE)
93    {
94      ResetEvent(sp->cancelEvent);
95      sp->state = PThreadStateCanceling;
96      sp->cancelState = PTHREAD_CANCEL_DISABLE;
97      ptw32_mcs_lock_release (&stateLock);
98      ptw32_throw (PTW32_EPS_CANCEL);
99      /* Never returns here */
100    }
101
102  ptw32_mcs_lock_release (&stateLock);
103}				/* pthread_testcancel */
104