232 lines
6.7 KiB
C
232 lines
6.7 KiB
C
/*
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* ptw32_callUserDestroyRoutines.c
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*
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* Description:
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* This translation unit implements routines which are private to
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* the implementation and may be used throughout it.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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#if defined(__CLEANUP_CXX)
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# if defined(_MSC_VER)
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# include <eh.h>
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# elif defined(__WATCOMC__)
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# include <eh.h>
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# include <exceptio.h>
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# else
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# if defined(__GNUC__) && __GNUC__ < 3
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# include <new.h>
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# else
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# include <new>
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using
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std::terminate;
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# endif
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# endif
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#endif
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void
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ptw32_callUserDestroyRoutines (pthread_t thread)
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/*
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* -------------------------------------------------------------------
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* DOCPRIVATE
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*
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* This the routine runs through all thread keys and calls
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* the destroy routines on the user's data for the current thread.
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* It simulates the behaviour of POSIX Threads.
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*
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* PARAMETERS
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* thread
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* an instance of pthread_t
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*
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* RETURNS
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* N/A
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* -------------------------------------------------------------------
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*/
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{
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ThreadKeyAssoc * assoc;
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if (thread.p != NULL)
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{
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ptw32_mcs_local_node_t threadLock;
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ptw32_mcs_local_node_t keyLock;
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int assocsRemaining;
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int iterations = 0;
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ptw32_thread_t * sp = (ptw32_thread_t *) thread.p;
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/*
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* Run through all Thread<-->Key associations
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* for the current thread.
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*
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* Do this process at most PTHREAD_DESTRUCTOR_ITERATIONS times.
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*/
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do
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{
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assocsRemaining = 0;
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iterations++;
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ptw32_mcs_lock_acquire(&(sp->threadLock), &threadLock);
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/*
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* The pointer to the next assoc is stored in the thread struct so that
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* the assoc destructor in pthread_key_delete can adjust it
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* if it deletes this assoc. This can happen if we fail to acquire
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* both locks below, and are forced to release all of our locks,
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* leaving open the opportunity for pthread_key_delete to get in
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* before us.
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*/
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sp->nextAssoc = sp->keys;
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ptw32_mcs_lock_release(&threadLock);
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for (;;)
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{
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void * value;
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pthread_key_t k;
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void (*destructor) (void *);
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/*
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* First we need to serialise with pthread_key_delete by locking
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* both assoc guards, but in the reverse order to our convention,
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* so we must be careful to avoid deadlock.
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*/
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ptw32_mcs_lock_acquire(&(sp->threadLock), &threadLock);
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if ((assoc = (ThreadKeyAssoc *)sp->nextAssoc) == NULL)
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{
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/* Finished */
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ptw32_mcs_lock_release(&threadLock);
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break;
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}
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else
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{
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/*
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* assoc->key must be valid because assoc can't change or be
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* removed from our chain while we hold at least one lock. If
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* the assoc was on our key chain then the key has not been
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* deleted yet.
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*
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* Now try to acquire the second lock without deadlocking.
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* If we fail, we need to relinquish the first lock and the
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* processor and then try to acquire them all again.
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*/
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if (ptw32_mcs_lock_try_acquire(&(assoc->key->keyLock), &keyLock) == EBUSY)
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{
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ptw32_mcs_lock_release(&threadLock);
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Sleep(0);
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/*
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* Go around again.
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* If pthread_key_delete has removed this assoc in the meantime,
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* sp->nextAssoc will point to a new assoc.
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*/
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continue;
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}
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}
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/* We now hold both locks */
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sp->nextAssoc = assoc->nextKey;
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/*
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* Key still active; pthread_key_delete
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* will block on these same mutexes before
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* it can release actual key; therefore,
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* key is valid and we can call the destroy
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* routine;
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*/
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k = assoc->key;
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destructor = k->destructor;
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value = TlsGetValue(k->key);
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TlsSetValue (k->key, NULL);
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// Every assoc->key exists and has a destructor
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if (value != NULL && iterations <= PTHREAD_DESTRUCTOR_ITERATIONS)
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{
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/*
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* Unlock both locks before the destructor runs.
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* POSIX says pthread_key_delete can be run from destructors,
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* and that probably includes with this key as target.
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* pthread_setspecific can also be run from destructors and
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* also needs to be able to access the assocs.
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*/
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ptw32_mcs_lock_release(&threadLock);
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ptw32_mcs_lock_release(&keyLock);
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assocsRemaining++;
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#if defined(__cplusplus)
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try
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{
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/*
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* Run the caller's cleanup routine.
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*/
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destructor (value);
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}
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catch (...)
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{
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/*
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* A system unexpected exception has occurred
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* running the user's destructor.
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* We get control back within this block in case
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* the application has set up it's own terminate
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* handler. Since we are leaving the thread we
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* should not get any internal pthreads
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* exceptions.
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*/
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terminate ();
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}
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#else /* __cplusplus */
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/*
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* Run the caller's cleanup routine.
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*/
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destructor (value);
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#endif /* __cplusplus */
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}
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else
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{
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/*
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* Remove association from both the key and thread chains
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* and reclaim it's memory resources.
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*/
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ptw32_tkAssocDestroy (assoc);
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ptw32_mcs_lock_release(&threadLock);
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ptw32_mcs_lock_release(&keyLock);
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}
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}
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}
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while (assocsRemaining);
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}
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} /* ptw32_callUserDestroyRoutines */
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