| /* |
| * pthread_spin_destroy.c |
| * |
| * Description: |
| * This translation unit implements spin lock primitives. |
| * |
| * -------------------------------------------------------------------------- |
| * |
| * Pthreads-win32 - POSIX Threads Library for Win32 |
| * Copyright(C) 1998 John E. Bossom |
| * Copyright(C) 1999,2005 Pthreads-win32 contributors |
| * |
| * Contact Email: rpj@callisto.canberra.edu.au |
| * |
| * The current list of contributors is contained |
| * in the file CONTRIBUTORS included with the source |
| * code distribution. The list can also be seen at the |
| * following World Wide Web location: |
| * http://sources.redhat.com/pthreads-win32/contributors.html |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library in the file COPYING.LIB; |
| * if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
| */ |
| |
| #include "pthread.h" |
| #include "implement.h" |
| |
| |
| int |
| pthread_spin_destroy (pthread_spinlock_t * lock) |
| { |
| register pthread_spinlock_t s; |
| int result = 0; |
| |
| if (lock == NULL || *lock == NULL) |
| { |
| return EINVAL; |
| } |
| |
| if ((s = *lock) != PTHREAD_SPINLOCK_INITIALIZER) |
| { |
| if (s->interlock == PTW32_SPIN_USE_MUTEX) |
| { |
| result = pthread_mutex_destroy (&(s->u.mutex)); |
| } |
| else if ((PTW32_INTERLOCKED_LONG) PTW32_SPIN_UNLOCKED != |
| PTW32_INTERLOCKED_COMPARE_EXCHANGE ((PTW32_INTERLOCKED_LPLONG) |
| & (s->interlock), |
| (PTW32_INTERLOCKED_LONG) |
| PTW32_OBJECT_INVALID, |
| (PTW32_INTERLOCKED_LONG) |
| PTW32_SPIN_UNLOCKED)) |
| { |
| result = EINVAL; |
| } |
| |
| if (0 == result) |
| { |
| /* |
| * We are relying on the application to ensure that all other threads |
| * have finished with the spinlock before destroying it. |
| */ |
| *lock = NULL; |
| (void) free (s); |
| } |
| } |
| else |
| { |
| /* |
| * See notes in ptw32_spinlock_check_need_init() above also. |
| */ |
| EnterCriticalSection (&ptw32_spinlock_test_init_lock); |
| |
| /* |
| * Check again. |
| */ |
| if (*lock == PTHREAD_SPINLOCK_INITIALIZER) |
| { |
| /* |
| * This is all we need to do to destroy a statically |
| * initialised spinlock that has not yet been used (initialised). |
| * If we get to here, another thread |
| * waiting to initialise this mutex will get an EINVAL. |
| */ |
| *lock = NULL; |
| } |
| else |
| { |
| /* |
| * The spinlock has been initialised while we were waiting |
| * so assume it's in use. |
| */ |
| result = EBUSY; |
| } |
| |
| LeaveCriticalSection (&ptw32_spinlock_test_init_lock); |
| } |
| |
| return (result); |
| } |