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+/*
+ * ptw32_callUserDestroyRoutines.c
+ *
+ * Description:
+ * This translation unit implements routines which are private to
+ * the implementation and may be used throughout it.
+ *
+ * --------------------------------------------------------------------------
+ *
+ * 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"
+
+#ifdef __cplusplus
+# if ! defined (_MSC_VER) && ! (defined(__GNUC__) && __GNUC__ < 3) && ! defined(__WATCOMC__)
+using
+ std::terminate;
+# endif
+#endif
+
+void
+ptw32_callUserDestroyRoutines (pthread_t thread)
+ /*
+ * -------------------------------------------------------------------
+ * DOCPRIVATE
+ *
+ * This the routine runs through all thread keys and calls
+ * the destroy routines on the user's data for the current thread.
+ * It simulates the behaviour of POSIX Threads.
+ *
+ * PARAMETERS
+ * thread
+ * an instance of pthread_t
+ *
+ * RETURNS
+ * N/A
+ * -------------------------------------------------------------------
+ */
+{
+ ThreadKeyAssoc * assoc;
+
+ if (thread.p != NULL)
+ {
+ int assocsRemaining;
+ int iterations = 0;
+ ptw32_thread_t * sp = (ptw32_thread_t *) thread.p;
+
+ /*
+ * Run through all Thread<-->Key associations
+ * for the current thread.
+ *
+ * Do this process at most PTHREAD_DESTRUCTOR_ITERATIONS times.
+ */
+ do
+ {
+ assocsRemaining = 0;
+ iterations++;
+
+ (void) pthread_mutex_lock(&(sp->threadLock));
+ /*
+ * The pointer to the next assoc is stored in the thread struct so that
+ * the assoc destructor in pthread_key_delete can adjust it
+ * if it deletes this assoc. This can happen if we fail to acquire
+ * both locks below, and are forced to release all of our locks,
+ * leaving open the opportunity for pthread_key_delete to get in
+ * before us.
+ */
+ sp->nextAssoc = sp->keys;
+ (void) pthread_mutex_unlock(&(sp->threadLock));
+
+ for (;;)
+ {
+ void * value;
+ pthread_key_t k;
+ void (*destructor) (void *);
+
+ /*
+ * First we need to serialise with pthread_key_delete by locking
+ * both assoc guards, but in the reverse order to our convention,
+ * so we must be careful to avoid deadlock.
+ */
+ (void) pthread_mutex_lock(&(sp->threadLock));
+
+ if ((assoc = (ThreadKeyAssoc *)sp->nextAssoc) == NULL)
+ {
+ /* Finished */
+ pthread_mutex_unlock(&(sp->threadLock));
+ break;
+ }
+ else
+ {
+ /*
+ * assoc->key must be valid because assoc can't change or be
+ * removed from our chain while we hold at least one lock. If
+ * the assoc was on our key chain then the key has not been
+ * deleted yet.
+ *
+ * Now try to acquire the second lock without deadlocking.
+ * If we fail, we need to relinquish the first lock and the
+ * processor and then try to acquire them all again.
+ */
+ if (pthread_mutex_trylock(&(assoc->key->keyLock)) == EBUSY)
+ {
+ pthread_mutex_unlock(&(sp->threadLock));
+ Sleep(1); // Ugly but necessary to avoid priority effects.
+ /*
+ * Go around again.
+ * If pthread_key_delete has removed this assoc in the meantime,
+ * sp->nextAssoc will point to a new assoc.
+ */
+ continue;
+ }
+ }
+
+ /* We now hold both locks */
+
+ sp->nextAssoc = assoc->nextKey;
+
+ /*
+ * Key still active; pthread_key_delete
+ * will block on these same mutexes before
+ * it can release actual key; therefore,
+ * key is valid and we can call the destroy
+ * routine;
+ */
+ k = assoc->key;
+ destructor = k->destructor;
+ value = TlsGetValue(k->key);
+ TlsSetValue (k->key, NULL);
+
+ // Every assoc->key exists and has a destructor
+ if (value != NULL && iterations <= PTHREAD_DESTRUCTOR_ITERATIONS)
+ {
+ /*
+ * Unlock both locks before the destructor runs.
+ * POSIX says pthread_key_delete can be run from destructors,
+ * and that probably includes with this key as target.
+ * pthread_setspecific can also be run from destructors and
+ * also needs to be able to access the assocs.
+ */
+ (void) pthread_mutex_unlock(&(sp->threadLock));
+ (void) pthread_mutex_unlock(&(k->keyLock));
+
+ assocsRemaining++;
+
+#ifdef __cplusplus
+
+ try
+ {
+ /*
+ * Run the caller's cleanup routine.
+ */
+ destructor (value);
+ }
+ catch (...)
+ {
+ /*
+ * A system unexpected exception has occurred
+ * running the user's destructor.
+ * We get control back within this block in case
+ * the application has set up it's own terminate
+ * handler. Since we are leaving the thread we
+ * should not get any internal pthreads
+ * exceptions.
+ */
+ terminate ();
+ }
+
+#else /* __cplusplus */
+
+ /*
+ * Run the caller's cleanup routine.
+ */
+ destructor (value);
+
+#endif /* __cplusplus */
+
+ }
+ else
+ {
+ /*
+ * Remove association from both the key and thread chains
+ * and reclaim it's memory resources.
+ */
+ ptw32_tkAssocDestroy (assoc);
+ (void) pthread_mutex_unlock(&(sp->threadLock));
+ (void) pthread_mutex_unlock(&(k->keyLock));
+ }
+ }
+ }
+ while (assocsRemaining);
+ }
+} /* ptw32_callUserDestroyRoutines */