/*
* Pop a clean pthread_t struct off the reuse stack.
*/
pthread_t
ptw32_threadReusePop (void)
{
pthread_t t = {NULL, 0};
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
if (PTW32_THREAD_REUSE_EMPTY != ptw32_threadReuseTop)
{
ptw32_thread_t * tp;
tp = ptw32_threadReuseTop;
ptw32_threadReuseTop = tp->prevReuse;
if (PTW32_THREAD_REUSE_EMPTY == ptw32_threadReuseTop)
{
ptw32_threadReuseBottom = PTW32_THREAD_REUSE_EMPTY;
}
tp->prevReuse = PTW32_THREAD_REUSE_EMPTY;
t = tp->ptHandle;
}
ptw32_mcs_lock_release(&node);
return t;
}
static void PTW32_CDECL
ptw32_once_on_init_cancel (void * arg)
{
/* when the initting thread is cancelled we have to release the lock */
ptw32_mcs_local_node_t *node = (ptw32_mcs_local_node_t *)arg;
ptw32_mcs_lock_release(node);
}
int
pthread_getname_np(pthread_t thr, char *name, int len)
{
ptw32_mcs_local_node_t threadLock;
ptw32_thread_t * tp;
char * s, * d;
int result;
/*
* Validate the thread id. This method works for pthreads-win32 because
* pthread_kill and pthread_t are designed to accommodate it, but the
* method is not portable.
*/
result = pthread_kill (thr, 0);
if (0 != result)
{
return result;
}
tp = (ptw32_thread_t *) thr.p;
ptw32_mcs_lock_acquire (&tp->threadLock, &threadLock);
for (s = tp->name, d = name; *s && d < &name[len - 1]; *d++ = *s++)
{}
*d = '\0';
ptw32_mcs_lock_release (&threadLock);
return result;
}
int
pthread_kill (pthread_t thread, int sig)
{
int result = 0;
ptw32_thread_t * tp;
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
tp = (ptw32_thread_t *) thread.p;
if (NULL == tp
|| thread.x != tp->ptHandle.x
|| NULL == tp->threadH)
{
result = ESRCH;
}
ptw32_mcs_lock_release(&node);
if (0 == result && 0 != sig)
{
result = EINVAL;
}
return result;
}
int
pthread_kill (pthread_t thread, int sig)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function requests that a signal be delivered to the
* specified thread. If sig is zero, error checking is
* performed but no signal is actually sent such that this
* function can be used to check for a valid thread ID.
*
* PARAMETERS
* thread reference to an instances of pthread_t
* sig signal. Currently only a value of 0 is supported.
*
*
* DESCRIPTION
* This function requests that a signal be delivered to the
* specified thread. If sig is zero, error checking is
* performed but no signal is actually sent such that this
* function can be used to check for a valid thread ID.
*
* RESULTS
* ESRCH the thread is not a valid thread ID,
* EINVAL the value of the signal is invalid
* or unsupported.
* 0 the signal was successfully sent.
*
* ------------------------------------------------------
*/
{
int result = 0;
ptw32_thread_t * tp;
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
tp = (ptw32_thread_t *) thread.p;
if (NULL == tp
|| thread.x != tp->ptHandle.x
|| NULL == tp->threadH)
{
result = ESRCH;
}
ptw32_mcs_lock_release(&node);
if (0 == result && 0 != sig)
{
/*
* Currently does not support any signals.
*/
result = EINVAL;
}
return result;
} /* pthread_kill */
BOOL
pthread_win32_thread_detach_np ()
{
if (ptw32_processInitialized)
{
/*
* Don't use pthread_self() - to avoid creating an implicit POSIX thread handle
* unnecessarily.
*/
ptw32_thread_t * sp = (ptw32_thread_t *) pthread_getspecific (ptw32_selfThreadKey);
if (sp != NULL) // otherwise Win32 thread with no implicit POSIX handle.
{
ptw32_mcs_local_node_t stateLock;
ptw32_callUserDestroyRoutines (sp->ptHandle);
ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
sp->state = PThreadStateLast;
/*
* If the thread is joinable at this point then it MUST be joined
* or detached explicitly by the application.
*/
ptw32_mcs_lock_release (&stateLock);
/*
* Robust Mutexes
*/
while (sp->robustMxList != NULL)
{
pthread_mutex_t mx = sp->robustMxList->mx;
ptw32_robust_mutex_remove(&mx, sp);
(void) PTW32_INTERLOCKED_EXCHANGE_LONG(
(PTW32_INTERLOCKED_LONGPTR)&mx->robustNode->stateInconsistent,
(PTW32_INTERLOCKED_LONG)-1);
/*
* If there are no waiters then the next thread to block will
* sleep, wake up immediately and then go back to sleep.
* See pthread_mutex_lock.c.
*/
SetEvent(mx->event);
}
if (sp->detachState == PTHREAD_CREATE_DETACHED)
{
ptw32_threadDestroy (sp->ptHandle);
if (ptw32_selfThreadKey)
{
TlsSetValue (ptw32_selfThreadKey->key, NULL);
}
}
}
}
return TRUE;
}
int
sem_trywait (sem_t * sem)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function tries to wait on a semaphore.
*
* PARAMETERS
* sem
* pointer to an instance of sem_t
*
* DESCRIPTION
* This function tries to wait on a semaphore. If the
* semaphore value is greater than zero, it decreases
* its value by one. If the semaphore value is zero, then
* this function returns immediately with the error EAGAIN
*
* RESULTS
* 0 successfully decreased semaphore,
* -1 failed, error in errno
* ERRNO
* EAGAIN the semaphore was already locked,
* EINVAL 'sem' is not a valid semaphore,
* ENOTSUP sem_trywait is not supported,
* EINTR the function was interrupted by a signal,
* EDEADLK a deadlock condition was detected.
*
* ------------------------------------------------------
*/
{
int result = 0;
sem_t s = *sem;
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&s->lock, &node);
if (s->value > 0)
{
s->value--;
}
else
{
result = EAGAIN;
}
ptw32_mcs_lock_release(&node);
if (result != 0)
{
PTW32_SET_ERRNO(result);
return -1;
}
return 0;
} /* sem_trywait */
int
ptw32_setthreadpriority (
ptw32_handle_t thread, int policy, int priority)
{
int prio;
ptw32_mcs_local_node_t threadLock;
int result = 0;
ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
prio = priority;
/* Validate priority level. */
if (prio < sched_get_priority_min (policy) ||
prio > sched_get_priority_max (policy))
{
return EINVAL;
}
#if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
/* WinCE */
#else
/* Everything else */
if (THREAD_PRIORITY_IDLE < prio && THREAD_PRIORITY_LOWEST > prio)
{
prio = THREAD_PRIORITY_LOWEST;
}
else if (THREAD_PRIORITY_TIME_CRITICAL > prio
&& THREAD_PRIORITY_HIGHEST < prio)
{
prio = THREAD_PRIORITY_HIGHEST;
}
#endif
ptw32_mcs_lock_acquire (&tp->threadLock, &threadLock);
/* If this fails, the current priority is unchanged. */
if (0 == SetThreadPriority (tp->threadH, prio))
{
result = EINVAL;
}
else
{
/*
* Must record the thread's sched_priority as given,
* not as finally adjusted.
*/
tp->sched_priority = priority;
}
ptw32_mcs_lock_release (&threadLock);
return result;
}
int
pthread_barrier_wait (pthread_barrier_t * barrier)
{
int result;
pthread_barrier_t b;
ptw32_mcs_local_node_t node;
if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID)
{
return EINVAL;
}
ptw32_mcs_lock_acquire(&(*barrier)->lock, &node);
b = *barrier;
if (--b->nCurrentBarrierHeight == 0)
{
ptw32_mcs_node_transfer(&b->proxynode, &node);
result = (b->nInitialBarrierHeight > 1
? sem_post_multiple (&(b->semBarrierBreeched),
b->nInitialBarrierHeight - 1) : 0);
}
else
{
ptw32_mcs_lock_release(&node);
result = ptw32_semwait (&(b->semBarrierBreeched));
}
if ((PTW32_INTERLOCKED_LONG)PTW32_INTERLOCKED_INCREMENT_LONG((PTW32_INTERLOCKED_LONGPTR)&b->nCurrentBarrierHeight)
== (PTW32_INTERLOCKED_LONG)b->nInitialBarrierHeight)
{
ptw32_mcs_lock_release(&b->proxynode);
if (0 == result)
{
result = PTHREAD_BARRIER_SERIAL_THREAD;
}
}
return (result);
}
int
pthread_setcanceltype (int type, int *oldtype)
{
ptw32_mcs_local_node_t stateLock;
int result = 0;
pthread_t self = pthread_self ();
ptw32_thread_t * sp = (ptw32_thread_t *) self.p;
if (sp == NULL
|| (type != PTHREAD_CANCEL_DEFERRED
&& type != PTHREAD_CANCEL_ASYNCHRONOUS))
{
return EINVAL;
}
ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
if (oldtype != NULL)
{
*oldtype = sp->cancelType;
}
sp->cancelType = type;
if (sp->cancelState == PTHREAD_CANCEL_ENABLE
&& type == PTHREAD_CANCEL_ASYNCHRONOUS
&& WaitForSingleObject (sp->cancelEvent, 0) == WAIT_OBJECT_0)
{
sp->state = PThreadStateCanceling;
sp->cancelState = PTHREAD_CANCEL_DISABLE;
ResetEvent (sp->cancelEvent);
ptw32_mcs_lock_release (&stateLock);
ptw32_throw (PTW32_EPS_CANCEL);
}
ptw32_mcs_lock_release (&stateLock);
return (result);
}
int
ptw32_setthreadpriority (pthread_t thread, int policy, int priority)
{
int prio;
ptw32_mcs_local_node_t threadLock;
int result = 0;
ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
prio = priority;
if (prio < sched_get_priority_min (policy) ||
prio > sched_get_priority_max (policy))
{
return EINVAL;
}
#if (THREAD_PRIORITY_LOWEST > THREAD_PRIORITY_NORMAL)
#else
if (THREAD_PRIORITY_IDLE < prio && THREAD_PRIORITY_LOWEST > prio)
{
prio = THREAD_PRIORITY_LOWEST;
}
else if (THREAD_PRIORITY_TIME_CRITICAL > prio
&& THREAD_PRIORITY_HIGHEST < prio)
{
prio = THREAD_PRIORITY_HIGHEST;
}
#endif
ptw32_mcs_lock_acquire (&tp->threadLock, &threadLock);
if (0 == SetThreadPriority (tp->threadH, prio))
{
result = EINVAL;
}
else
{
tp->sched_priority = priority;
}
ptw32_mcs_lock_release (&threadLock);
return result;
}
void *
pthread_timechange_handler_np (void *arg)
/*
* ------------------------------------------------------
* DOCPUBLIC
* Broadcasts all CVs to force re-evaluation and
* new timeouts if required.
*
* PARAMETERS
* NONE
*
*
* DESCRIPTION
* Broadcasts all CVs to force re-evaluation and
* new timeouts if required.
*
* This routine may be passed directly to pthread_create()
* as a new thread in order to run asynchronously.
*
*
* RESULTS
* 0 successfully broadcast all CVs
* EAGAIN Not all CVs were broadcast
*
* ------------------------------------------------------
*/
{
int result = 0;
pthread_cond_t cv;
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_cond_list_lock, &node);
cv = ptw32_cond_list_head;
while (cv != NULL && 0 == result)
{
result = pthread_cond_broadcast (&cv);
cv = cv->next;
}
ptw32_mcs_lock_release(&node);
return (void *) (size_t) (result != 0 ? EAGAIN : 0);
}
INLINE int
ptw32_mutex_check_need_init (pthread_mutex_t * mutex)
{
register int result = 0;
register pthread_mutex_t mtx;
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_mutex_test_init_lock, &node);
/*
* We got here possibly under race
* conditions. Check again inside the critical section
* and only initialise if the mutex is valid (not been destroyed).
* If a static mutex has been destroyed, the application can
* re-initialise it only by calling pthread_mutex_init()
* explicitly.
*/
mtx = *mutex;
if (mtx == PTHREAD_MUTEX_INITIALIZER)
{
result = pthread_mutex_init (mutex, NULL);
}
else if (mtx == PTHREAD_RECURSIVE_MUTEX_INITIALIZER)
{
result = pthread_mutex_init (mutex, &ptw32_recursive_mutexattr);
}
else if (mtx == PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
{
result = pthread_mutex_init (mutex, &ptw32_errorcheck_mutexattr);
}
else if (mtx == NULL)
{
/*
* The mutex has been destroyed while we were waiting to
* initialise it, so the operation that caused the
* auto-initialisation should fail.
*/
result = EINVAL;
}
ptw32_mcs_lock_release(&node);
return (result);
}
INLINE int
ptw32_cond_check_need_init (pthread_cond_t * cond)
{
int result = 0;
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_cond_test_init_lock, &node);
if (*cond == PTHREAD_COND_INITIALIZER)
{
result = pthread_cond_init (cond, NULL);
}
else if (*cond == NULL)
{
result = EINVAL;
}
ptw32_mcs_lock_release(&node);
return result;
}
int
pthread_once (pthread_once_t * once_control, void (PTW32_CDECL *init_routine) (void))
{
if (once_control == NULL || init_routine == NULL)
{
return EINVAL;
}
if ((PTW32_INTERLOCKED_LONG)PTW32_FALSE ==
(PTW32_INTERLOCKED_LONG)PTW32_INTERLOCKED_EXCHANGE_ADD_LONG((PTW32_INTERLOCKED_LONGPTR)&once_control->done,
(PTW32_INTERLOCKED_LONG)0)) /* MBR fence */
{
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire((ptw32_mcs_lock_t *)&once_control->lock, &node);
if (!once_control->done)
{
#if defined(_MSC_VER) && _MSC_VER < 1400
#pragma inline_depth(0)
#endif
pthread_cleanup_push(ptw32_mcs_lock_release, &node);
(*init_routine)();
pthread_cleanup_pop(0);
#if defined(_MSC_VER) && _MSC_VER < 1400
#pragma inline_depth()
#endif
once_control->done = PTW32_TRUE;
}
ptw32_mcs_lock_release(&node);
}
return 0;
} /* pthread_once */
static void PTW32_CDECL
ptw32_sem_timedwait_cleanup (void * args)
{
ptw32_mcs_local_node_t node;
sem_timedwait_cleanup_args_t * a = (sem_timedwait_cleanup_args_t *)args;
sem_t s = a->sem;
ptw32_mcs_lock_acquire(&s->lock, &node);
/*
* We either timed out or were cancelled.
* If someone has posted between then and now we try to take the semaphore.
* Otherwise the semaphore count may be wrong after we
* return. In the case of a cancellation, it is as if we
* were cancelled just before we return (after taking the semaphore)
* which is ok.
*/
if (WaitForSingleObject(s->sem, 0) == WAIT_OBJECT_0)
{
/* We got the semaphore on the second attempt */
*(a->resultPtr) = 0;
}
else
{
/* Indicate we're no longer waiting */
s->value++;
#if defined(NEED_SEM)
if (s->value > 0)
{
s->leftToUnblock = 0;
}
#else
/*
* Don't release the W32 sema, it doesn't need adjustment
* because it doesn't record the number of waiters.
*/
#endif
}
ptw32_mcs_lock_release(&node);
}
/*
* Push a clean pthread_t struct onto the reuse stack.
* Must be re-initialised when reused.
* All object elements (mutexes, events etc) must have been either
* destroyed before this, or never initialised.
*/
void
ptw32_threadReusePush (pthread_t thread)
{
ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
pthread_t t;
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
t = tp->ptHandle;
memset(tp, 0, sizeof(ptw32_thread_t));
/* Must restore the original POSIX handle that we just wiped. */
tp->ptHandle = t;
/* Bump the reuse counter now */
#if defined(PTW32_THREAD_ID_REUSE_INCREMENT)
tp->ptHandle.x += PTW32_THREAD_ID_REUSE_INCREMENT;
#else
tp->ptHandle.x++;
#endif
tp->state = PThreadStateReuse;
tp->prevReuse = PTW32_THREAD_REUSE_EMPTY;
if (PTW32_THREAD_REUSE_EMPTY != ptw32_threadReuseBottom)
{
ptw32_threadReuseBottom->prevReuse = tp;
}
else
{
ptw32_threadReuseTop = tp;
}
ptw32_threadReuseBottom = tp;
ptw32_mcs_lock_release(&node);
}
int
pthread_once (pthread_once_t * once_control, void (*init_routine) (void))
{
if (once_control == NULL || init_routine == NULL)
{
return EINVAL;
}
if (InterlockedExchangeAdd((LPLONG)&once_control->init, 0L)) /* MBR fence */
{
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire((ptw32_mcs_lock_t *)&once_control->lock, &node);
if (once_control->init)
{
#ifdef _MSC_VER
#pragma inline_depth(0)
#endif
pthread_cleanup_push(ptw32_once_on_init_cancel, (void *)&node);
(*init_routine)();
pthread_cleanup_pop(0);
#ifdef _MSC_VER
#pragma inline_depth()
#endif
once_control->init = 0;
}
ptw32_mcs_lock_release(&node);
}
return 0;
} /* pthread_once */
int
ptw32_rwlock_check_need_init (pthread_rwlock_t * rwlock)
{
int result = 0;
ptw32_mcs_local_node_t node;
/*
* The following guarded test is specifically for statically
* initialised rwlocks (via PTHREAD_RWLOCK_INITIALIZER).
*/
ptw32_mcs_lock_acquire(&ptw32_rwlock_test_init_lock, &node);
/*
* We got here possibly under race
* conditions. Check again inside the critical section
* and only initialise if the rwlock is valid (not been destroyed).
* If a static rwlock has been destroyed, the application can
* re-initialise it only by calling pthread_rwlock_init()
* explicitly.
*/
if (*rwlock == PTHREAD_RWLOCK_INITIALIZER)
{
result = pthread_rwlock_init (rwlock, NULL);
}
else if (*rwlock == NULL)
{
/*
* The rwlock has been destroyed while we were waiting to
* initialise it, so the operation that caused the
* auto-initialisation should fail.
*/
result = EINVAL;
}
ptw32_mcs_lock_release(&node);
return result;
}
int
ptw32_cond_check_need_init (pthread_cond_t * cond)
{
int result = 0;
ptw32_mcs_local_node_t node;
/*
* The following guarded test is specifically for statically
* initialised condition variables (via PTHREAD_OBJECT_INITIALIZER).
*/
ptw32_mcs_lock_acquire(&ptw32_cond_test_init_lock, &node);
/*
* We got here possibly under race
* conditions. Check again inside the critical section.
* If a static cv has been destroyed, the application can
* re-initialise it only by calling pthread_cond_init()
* explicitly.
*/
if (*cond == PTHREAD_COND_INITIALIZER)
{
result = pthread_cond_init (cond, NULL);
}
else if (*cond == NULL)
{
/*
* The cv has been destroyed while we were waiting to
* initialise it, so the operation that caused the
* auto-initialisation should fail.
*/
result = EINVAL;
}
ptw32_mcs_lock_release(&node);
return result;
}
int
pthread_cond_destroy (pthread_cond_t * cond)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function destroys a condition variable
*
*
* PARAMETERS
* cond
* pointer to an instance of pthread_cond_t
*
*
* DESCRIPTION
* This function destroys a condition variable.
*
* NOTES:
* 1) A condition variable can be destroyed
* immediately after all the threads that
* are blocked on it are awakened. e.g.
*
* struct list {
* pthread_mutex_t lm;
* ...
* }
*
* struct elt {
* key k;
* int busy;
* pthread_cond_t notbusy;
* ...
* }
*
*
* struct elt *
* list_find(struct list *lp, key k)
* {
* struct elt *ep;
*
* pthread_mutex_lock(&lp->lm);
* while ((ep = find_elt(l,k) != NULL) && ep->busy)
* pthread_cond_wait(&ep->notbusy, &lp->lm);
* if (ep != NULL)
* ep->busy = 1;
* pthread_mutex_unlock(&lp->lm);
* return(ep);
* }
*
* delete_elt(struct list *lp, struct elt *ep)
* {
* pthread_mutex_lock(&lp->lm);
* assert(ep->busy);
* ... remove ep from list ...
* ep->busy = 0;
* (A) pthread_cond_broadcast(&ep->notbusy);
* pthread_mutex_unlock(&lp->lm);
* (B) pthread_cond_destroy(&rp->notbusy);
* free(ep);
* }
*
* In this example, the condition variable
* and its list element may be freed (line B)
* immediately after all threads waiting for
* it are awakened (line A), since the mutex
* and the code ensure that no other thread
* can touch the element to be deleted.
*
* RESULTS
* 0 successfully released condition variable,
* EINVAL 'cond' is invalid,
* EBUSY 'cond' is in use,
*
* ------------------------------------------------------
*/
{
pthread_cond_t cv;
int result = 0, result1 = 0, result2 = 0;
/*
* Assuming any race condition here is harmless.
*/
if (cond == NULL || *cond == NULL)
{
return EINVAL;
}
if (*cond != PTHREAD_COND_INITIALIZER)
{
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_cond_list_lock, &node);
cv = *cond;
/*
* Close the gate; this will synchronize this thread with
* all already signaled waiters to let them retract their
* waiter status - SEE NOTE 1 ABOVE!!!
*/
if (ptw32_semwait (&(cv->semBlockLock)) != 0) /* Non-cancelable */
{
result = PTW32_GET_ERRNO();
}
else
{
/*
* !TRY! lock mtxUnblockLock; try will detect busy condition
* and will not cause a deadlock with respect to concurrent
* signal/broadcast.
*/
if ((result = pthread_mutex_trylock (&(cv->mtxUnblockLock))) != 0)
{
(void) sem_post (&(cv->semBlockLock));
}
}
if (result != 0)
{
ptw32_mcs_lock_release(&node);
return result;
}
/*
* Check whether cv is still busy (still has waiters)
*/
if (cv->nWaitersBlocked > cv->nWaitersGone)
{
if (sem_post (&(cv->semBlockLock)) != 0)
{
result = PTW32_GET_ERRNO();
}
result1 = pthread_mutex_unlock (&(cv->mtxUnblockLock));
result2 = EBUSY;
}
else
{
/*
* Now it is safe to destroy
*/
*cond = NULL;
if (sem_destroy (&(cv->semBlockLock)) != 0)
{
result = PTW32_GET_ERRNO();
}
if (sem_destroy (&(cv->semBlockQueue)) != 0)
{
result1 = PTW32_GET_ERRNO();
}
if ((result2 = pthread_mutex_unlock (&(cv->mtxUnblockLock))) == 0)
{
result2 = pthread_mutex_destroy (&(cv->mtxUnblockLock));
}
/* Unlink the CV from the list */
if (ptw32_cond_list_head == cv)
{
ptw32_cond_list_head = cv->next;
}
else
{
cv->prev->next = cv->next;
}
if (ptw32_cond_list_tail == cv)
{
ptw32_cond_list_tail = cv->prev;
}
else
{
cv->next->prev = cv->prev;
}
(void) free (cv);
}
ptw32_mcs_lock_release(&node);
}
else
{
ptw32_mcs_local_node_t node;
/*
* See notes in ptw32_cond_check_need_init() above also.
*/
ptw32_mcs_lock_acquire(&ptw32_cond_test_init_lock, &node);
/*
* Check again.
*/
if (*cond == PTHREAD_COND_INITIALIZER)
{
/*
* This is all we need to do to destroy a statically
* initialised cond that has not yet been used (initialised).
* If we get to here, another thread waiting to initialise
* this cond will get an EINVAL. That's OK.
*/
*cond = NULL;
}
else
{
/*
* The cv has been initialised while we were waiting
* so assume it's in use.
*/
result = EBUSY;
}
ptw32_mcs_lock_release(&node);
}
return ((result != 0) ? result : ((result1 != 0) ? result1 : result2));
}
int
pthread_timedjoin_np (pthread_t thread, void **value_ptr, const struct timespec *abstime)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function waits for 'thread' to terminate and
* returns the thread's exit value if 'value_ptr' is not
* NULL or until 'abstime' passes and returns an
* error. If 'abstime' is NULL then the function waits
* forever, i.e. reverts to pthread_join behaviour.
* This function detaches the thread on successful
* completion.
*
* PARAMETERS
* thread
* an instance of pthread_t
*
* value_ptr
* pointer to an instance of pointer to void
*
* abstime
* pointer to an instance of struct timespec
* representing an absolute time value
*
*
* DESCRIPTION
* This function waits for 'thread' to terminate and
* returns the thread's exit value if 'value_ptr' is not
* NULL or until 'abstime' passes and returns an
* error. If 'abstime' is NULL then the function waits
* forever, i.e. reverts to pthread_join behaviour.
* This function detaches the thread on successful
* completion.
* NOTE: Detached threads cannot be joined or canceled.
* In this implementation 'abstime' will be
* resolved to the nearest millisecond.
*
* RESULTS
* 0 'thread' has completed
* ETIMEDOUT abstime passed
* EINVAL thread is not a joinable thread,
* ESRCH no thread could be found with ID 'thread',
* ENOENT thread couldn't find it's own valid handle,
* EDEADLK attempt to join thread with self
*
* ------------------------------------------------------
*/
{
int result;
pthread_t self;
DWORD milliseconds;
ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
ptw32_mcs_local_node_t node;
if (abstime == NULL)
{
milliseconds = INFINITE;
}
else
{
/*
* Calculate timeout as milliseconds from current system time.
*/
milliseconds = ptw32_relmillisecs (abstime);
}
ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
if (NULL == tp
|| thread.x != tp->ptHandle.x)
{
result = ESRCH;
}
else if (PTHREAD_CREATE_DETACHED == tp->detachState)
{
result = EINVAL;
}
else
{
result = 0;
}
ptw32_mcs_lock_release(&node);
if (result == 0)
{
/*
* The target thread is joinable and can't be reused before we join it.
*/
self = pthread_self();
if (NULL == self.p)
{
result = ENOENT;
}
else if (pthread_equal (self, thread))
{
result = EDEADLK;
}
else
{
/*
* Pthread_join is a cancellation point.
* If we are canceled then our target thread must not be
* detached (destroyed). This is guaranteed because
* pthreadCancelableTimedWait will not return if we
* are canceled.
*/
result = pthreadCancelableTimedWait (tp->threadH, milliseconds);
if (0 == result)
{
if (value_ptr != NULL)
{
*value_ptr = tp->exitStatus;
}
/*
* The result of making multiple simultaneous calls to
* pthread_join() or pthread_timedjoin_np() or pthread_detach()
* specifying the same target is undefined.
*/
result = pthread_detach (thread);
}
else if (ETIMEDOUT != result)
{
result = ESRCH;
}
}
}
return (result);
}
int
pthread_barrier_wait (pthread_barrier_t * barrier)
{
int result;
pthread_barrier_t b;
ptw32_mcs_local_node_t node;
if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID)
{
return EINVAL;
}
ptw32_mcs_lock_acquire(&(*barrier)->lock, &node);
b = *barrier;
if (--b->nCurrentBarrierHeight == 0)
{
/*
* We are the last thread to arrive at the barrier before it releases us.
* Move our MCS local node to the global scope barrier handle so that the
* last thread out (not necessarily us) can release the lock.
*/
ptw32_mcs_node_transfer(&b->proxynode, &node);
/*
* Any threads that have not quite entered sem_wait below when the
* multiple_post has completed will nevertheless continue through
* the semaphore (barrier).
*/
result = (b->nInitialBarrierHeight > 1
? sem_post_multiple (&(b->semBarrierBreeched),
b->nInitialBarrierHeight - 1) : 0);
}
else
{
ptw32_mcs_lock_release(&node);
/*
* Use the non-cancelable version of sem_wait().
*
* It is possible that all nInitialBarrierHeight-1 threads are
* at this point when the last thread enters the barrier, resets
* nCurrentBarrierHeight = nInitialBarrierHeight and leaves.
* If pthread_barrier_destroy is called at that moment then the
* barrier will be destroyed along with the semas.
*/
result = ptw32_semwait (&(b->semBarrierBreeched));
}
if ((PTW32_INTERLOCKED_LONG)PTW32_INTERLOCKED_INCREMENT_LONG((PTW32_INTERLOCKED_LONGPTR)&b->nCurrentBarrierHeight)
== (PTW32_INTERLOCKED_LONG)b->nInitialBarrierHeight)
{
/*
* We are the last thread to cross this barrier
*/
ptw32_mcs_lock_release(&b->proxynode);
if (0 == result)
{
result = PTHREAD_BARRIER_SERIAL_THREAD;
}
}
return (result);
}
static INLINE int
ptw32_cancelable_wait (HANDLE waitHandle, DWORD timeout)
/*
* -------------------------------------------------------------------
* This provides an extra hook into the pthread_cancel
* mechanism that will allow you to wait on a Windows handle and make it a
* cancellation point. This function blocks until the given WIN32 handle is
* signaled or pthread_cancel has been called. It is implemented using
* WaitForMultipleObjects on 'waitHandle' and a manually reset WIN32
* event used to implement pthread_cancel.
*
* Given this hook it would be possible to implement more of the cancellation
* points.
* -------------------------------------------------------------------
*/
{
int result;
pthread_t self;
ptw32_thread_t * sp;
HANDLE handles[2];
DWORD nHandles = 1;
DWORD status;
handles[0] = waitHandle;
self = pthread_self();
sp = (ptw32_thread_t *) to_internal(self).p;
if (sp != NULL)
{
/*
* Get cancelEvent handle
*/
if (sp->cancelState == PTHREAD_CANCEL_ENABLE)
{
if ((handles[1] = sp->cancelEvent) != NULL)
{
nHandles++;
}
}
}
else
{
handles[1] = NULL;
}
status = WaitForMultipleObjects (nHandles, handles, PTW32_FALSE, timeout);
switch (status - WAIT_OBJECT_0)
{
case 0:
/*
* Got the handle.
* In the event that both handles are signalled, the smallest index
* value (us) is returned. As it has been arranged, this ensures that
* we don't drop a signal that we should act on (i.e. semaphore,
* mutex, or condition variable etc).
*/
result = 0;
break;
case 1:
/*
* Got cancel request.
* In the event that both handles are signaled, the cancel will
* be ignored (see case 0 comment).
*/
ResetEvent (handles[1]);
if (sp != NULL)
{
ptw32_mcs_local_node_t stateLock;
/*
* Should handle POSIX and implicit POSIX threads..
* Make sure we haven't been async-canceled in the meantime.
*/
ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
if (sp->state < PThreadStateCanceling)
{
sp->state = PThreadStateCanceling;
sp->cancelState = PTHREAD_CANCEL_DISABLE;
ptw32_mcs_lock_release (&stateLock);
ptw32_throw (PTW32_EPS_CANCEL);
/* Never reached */
}
ptw32_mcs_lock_release (&stateLock);
}
/* Should never get to here. */
result = EINVAL;
break;
default:
if (status == WAIT_TIMEOUT)
{
result = ETIMEDOUT;
}
else
{
result = EINVAL;
}
break;
}
return (result);
} /* CancelableWait */
int
pthread_cancel (pthread_t thread)
{
int result;
int cancel_self;
pthread_t self;
ptw32_thread_t * tp;
ptw32_mcs_local_node_t stateLock;
result = pthread_kill (thread, 0);
if (0 != result)
{
return result;
}
if ((self = pthread_self ()).p == NULL)
{
return ENOMEM;
};
cancel_self = pthread_equal (thread, self);
tp = (ptw32_thread_t *) thread.p;
ptw32_mcs_lock_acquire (&tp->stateLock, &stateLock);
if (tp->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS
&& tp->cancelState == PTHREAD_CANCEL_ENABLE
&& tp->state < PThreadStateCanceling)
{
if (cancel_self)
{
tp->state = PThreadStateCanceling;
tp->cancelState = PTHREAD_CANCEL_DISABLE;
ptw32_mcs_lock_release (&stateLock);
ptw32_throw (PTW32_EPS_CANCEL);
}
else
{
HANDLE threadH = tp->threadH;
SuspendThread (threadH);
if (WaitForSingleObject (threadH, 0) == WAIT_TIMEOUT)
{
tp->state = PThreadStateCanceling;
tp->cancelState = PTHREAD_CANCEL_DISABLE;
ptw32_register_cancelation ((PAPCFUNC)ptw32_cancel_callback, threadH, 0);
ptw32_mcs_lock_release (&stateLock);
ResumeThread (threadH);
}
}
}
else
{
if (tp->state < PThreadStateCancelPending)
{
tp->state = PThreadStateCancelPending;
if (!SetEvent (tp->cancelEvent))
{
result = ESRCH;
}
}
else if (tp->state >= PThreadStateCanceling)
{
result = ESRCH;
}
ptw32_mcs_lock_release (&stateLock);
}
return (result);
}
int
pthread_barrier_destroy (pthread_barrier_t * barrier)
{
int result = 0;
pthread_barrier_t b;
ptw32_mcs_local_node_t node;
if (barrier == NULL || *barrier == (pthread_barrier_t) PTW32_OBJECT_INVALID)
{
return EINVAL;
}
if (0 != ptw32_mcs_lock_try_acquire(&(*barrier)->lock, &node))
{
return EBUSY;
}
b = *barrier;
if (b->nCurrentBarrierHeight < b->nInitialBarrierHeight)
{
result = EBUSY;
}
else
{
if (0 == (result = sem_destroy (&(b->semBarrierBreeched))))
{
*barrier = (pthread_barrier_t) PTW32_OBJECT_INVALID;
/*
* Release the lock before freeing b.
*
* FIXME: There may be successors which, when we release the lock,
* will be linked into b->lock, which will be corrupted at some
* point with undefined results for the application. To fix this
* will require changing pthread_barrier_t from a pointer to
* pthread_barrier_t_ to an instance. This is a change to the ABI
* and will require a major version number increment.
*/
ptw32_mcs_lock_release(&node);
(void) free (b);
return 0;
}
else
{
/*
* This should not ever be reached.
* Restore the barrier to working condition before returning.
*/
(void) sem_init (&(b->semBarrierBreeched), b->pshared, 0);
}
if (result != 0)
{
/*
* The barrier still exists and is valid
* in the event of any error above.
*/
result = EBUSY;
}
}
ptw32_mcs_lock_release(&node);
return (result);
}
int
pthread_setcancelstate (int state, int *oldstate)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function atomically sets the calling thread's
* cancelability state to 'state' and returns the previous
* cancelability state at the location referenced by
* 'oldstate'
*
* PARAMETERS
* state,
* oldstate
* PTHREAD_CANCEL_ENABLE
* cancellation is enabled,
*
* PTHREAD_CANCEL_DISABLE
* cancellation is disabled
*
*
* DESCRIPTION
* This function atomically sets the calling thread's
* cancelability state to 'state' and returns the previous
* cancelability state at the location referenced by
* 'oldstate'.
*
* NOTES:
* 1) Use to disable cancellation around 'atomic' code that
* includes cancellation points
*
* COMPATIBILITY ADDITIONS
* If 'oldstate' is NULL then the previous state is not returned
* but the function still succeeds. (Solaris)
*
* RESULTS
* 0 successfully set cancelability type,
* EINVAL 'state' is invalid
*
* ------------------------------------------------------
*/
{
ptw32_mcs_local_node_t stateLock;
int result = 0;
pthread_t self = pthread_self ();
ptw32_thread_t * sp = (ptw32_thread_t *) self.p;
if (sp == NULL
|| (state != PTHREAD_CANCEL_ENABLE && state != PTHREAD_CANCEL_DISABLE))
{
return EINVAL;
}
/*
* Lock for async-cancel safety.
*/
ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
if (oldstate != NULL)
{
*oldstate = sp->cancelState;
}
sp->cancelState = state;
/*
* Check if there is a pending asynchronous cancel
*/
if (state == PTHREAD_CANCEL_ENABLE
&& sp->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS
&& WaitForSingleObject (sp->cancelEvent, 0) == WAIT_OBJECT_0)
{
sp->state = PThreadStateCanceling;
sp->cancelState = PTHREAD_CANCEL_DISABLE;
ResetEvent (sp->cancelEvent);
ptw32_mcs_lock_release (&stateLock);
ptw32_throw (PTW32_EPS_CANCEL);
/* Never reached */
}
ptw32_mcs_lock_release (&stateLock);
return (result);
} /* pthread_setcancelstate */
int
pthread_detach (pthread_t thread)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function detaches the given thread.
*
* PARAMETERS
* thread
* an instance of a pthread_t
*
*
* DESCRIPTION
* This function detaches the given thread. You may use it to
* detach the main thread or to detach a joinable thread.
* NOTE: detached threads cannot be joined;
* storage is freed immediately on termination.
*
* RESULTS
* 0 successfully detached the thread,
* EINVAL thread is not a joinable thread,
* ENOSPC a required resource has been exhausted,
* ESRCH no thread could be found for 'thread',
*
* ------------------------------------------------------
*/
{
int result;
BOOL destroyIt = PTW32_FALSE;
ptw32_thread_t * tp = (ptw32_thread_t *) thread.p;
ptw32_mcs_local_node_t node;
ptw32_mcs_lock_acquire(&ptw32_thread_reuse_lock, &node);
if (NULL == tp
|| thread.x != tp->ptHandle.x)
{
result = ESRCH;
}
else if (PTHREAD_CREATE_DETACHED == tp->detachState)
{
result = EINVAL;
}
else
{
ptw32_mcs_local_node_t stateLock;
/*
* Joinable ptw32_thread_t structs are not scavenged until
* a join or detach is done. The thread may have exited already,
* but all of the state and locks etc are still there.
*/
result = 0;
ptw32_mcs_lock_acquire (&tp->stateLock, &stateLock);
if (tp->state != PThreadStateLast)
{
tp->detachState = PTHREAD_CREATE_DETACHED;
}
else if (tp->detachState != PTHREAD_CREATE_DETACHED)
{
/*
* Thread is joinable and has exited or is exiting.
*/
destroyIt = PTW32_TRUE;
}
ptw32_mcs_lock_release (&stateLock);
}
ptw32_mcs_lock_release(&node);
if (result == 0)
{
/* Thread is joinable */
if (destroyIt)
{
/* The thread has exited or is exiting but has not been joined or
* detached. Need to wait in case it's still exiting.
*/
(void) WaitForSingleObject(tp->threadH, INFINITE);
ptw32_threadDestroy (thread);
}
}
return (result);
} /* pthread_detach */
int
pthread_setspecific (pthread_key_t key, const void *value)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function sets the value of the thread specific
* key in the calling thread.
*
* PARAMETERS
* key
* an instance of pthread_key_t
* value
* the value to set key to
*
*
* DESCRIPTION
* This function sets the value of the thread specific
* key in the calling thread.
*
* RESULTS
* 0 successfully set value
* EAGAIN could not set value
* ENOENT SERIOUS!!
*
* ------------------------------------------------------
*/
{
pthread_t self;
int result = 0;
if (key != ptw32_selfThreadKey)
{
/*
* Using pthread_self will implicitly create
* an instance of pthread_t for the current
* thread if one wasn't explicitly created
*/
self = pthread_self ();
if (self.p == NULL)
{
return ENOENT;
}
}
else
{
/*
* Resolve catch-22 of registering thread with selfThread
* key
*/
ptw32_thread_t * sp = (ptw32_thread_t *) pthread_getspecific (ptw32_selfThreadKey);
if (sp == NULL)
{
if (value == NULL)
{
return ENOENT;
}
self = *((pthread_t *) value);
}
else
{
self = sp->ptHandle;
}
}
result = 0;
if (key != NULL)
{
if (self.p != NULL && key->destructor != NULL && value != NULL)
{
ptw32_mcs_local_node_t keyLock;
ptw32_mcs_local_node_t threadLock;
ptw32_thread_t * sp = (ptw32_thread_t *) self.p;
/*
* Only require associations if we have to
* call user destroy routine.
* Don't need to locate an existing association
* when setting data to NULL for WIN32 since the
* data is stored with the operating system; not
* on the association; setting assoc to NULL short
* circuits the search.
*/
ThreadKeyAssoc *assoc;
ptw32_mcs_lock_acquire(&(key->keyLock), &keyLock);
ptw32_mcs_lock_acquire(&(sp->threadLock), &threadLock);
assoc = (ThreadKeyAssoc *) sp->keys;
/*
* Locate existing association
*/
while (assoc != NULL)
{
if (assoc->key == key)
{
/*
* Association already exists
*/
break;
}
assoc = assoc->nextKey;
}
/*
* create an association if not found
*/
if (assoc == NULL)
{
result = ptw32_tkAssocCreate (sp, key);
}
ptw32_mcs_lock_release(&threadLock);
ptw32_mcs_lock_release(&keyLock);
}
if (result == 0)
{
if (!TlsSetValue (key->key, (LPVOID) value))
{
result = EAGAIN;
}
}
}
return (result);
} /* pthread_setspecific */
int
sem_timedwait (sem_t * sem, const struct timespec *abstime)
/*
* ------------------------------------------------------
* DOCPUBLIC
* This function waits on a semaphore possibly until
* 'abstime' time.
*
* PARAMETERS
* sem
* pointer to an instance of sem_t
*
* abstime
* pointer to an instance of struct timespec
*
* DESCRIPTION
* This function waits on a semaphore. If the
* semaphore value is greater than zero, it decreases
* its value by one. If the semaphore value is zero, then
* the calling thread (or process) is blocked until it can
* successfully decrease the value or until interrupted by
* a signal.
*
* If 'abstime' is a NULL pointer then this function will
* block until it can successfully decrease the value or
* until interrupted by a signal.
*
* RESULTS
* 0 successfully decreased semaphore,
* -1 failed, error in errno
* ERRNO
* EINVAL 'sem' is not a valid semaphore,
* ENOSYS semaphores are not supported,
* EINTR the function was interrupted by a signal,
* EDEADLK a deadlock condition was detected.
* ETIMEDOUT abstime elapsed before success.
*
* ------------------------------------------------------
*/
{
ptw32_mcs_local_node_t node;
DWORD milliseconds;
int v;
int result = 0;
sem_t s = *sem;
pthread_testcancel();
if (abstime == NULL)
{
milliseconds = INFINITE;
}
else
{
/*
* Calculate timeout as milliseconds from current system time.
*/
milliseconds = ptw32_relmillisecs (abstime);
}
ptw32_mcs_lock_acquire(&s->lock, &node);
v = --s->value;
ptw32_mcs_lock_release(&node);
if (v < 0)
{
#if defined(NEED_SEM)
int timedout;
#endif
sem_timedwait_cleanup_args_t cleanup_args;
cleanup_args.sem = s;
cleanup_args.resultPtr = &result;
#if defined(PTW32_CONFIG_MSVC7)
#pragma inline_depth(0)
#endif
/* Must wait */
pthread_cleanup_push(ptw32_sem_timedwait_cleanup, (void *) &cleanup_args);
#if defined(NEED_SEM)
timedout =
#endif
result = pthreadCancelableTimedWait (s->sem, milliseconds);
pthread_cleanup_pop(result);
#if defined(PTW32_CONFIG_MSVC7)
#pragma inline_depth()
#endif
#if defined(NEED_SEM)
if (!timedout)
{
ptw32_mcs_lock_acquire(&s->lock, &node);
if (s->leftToUnblock > 0)
{
--s->leftToUnblock;
SetEvent(s->sem);
}
ptw32_mcs_lock_release(&node);
}
#endif /* NEED_SEM */
}
if (result != 0)
{
PTW32_SET_ERRNO(result);
return -1;
}
return 0;
} /* sem_timedwait */