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Diffstat (limited to 'pthreads/src/pthread_timechange_handler_np.c')
| -rw-r--r-- | pthreads/src/pthread_timechange_handler_np.c | 108 |
1 files changed, 0 insertions, 108 deletions
diff --git a/pthreads/src/pthread_timechange_handler_np.c b/pthreads/src/pthread_timechange_handler_np.c deleted file mode 100644 index 0f97e74..0000000 --- a/pthreads/src/pthread_timechange_handler_np.c +++ /dev/null @@ -1,108 +0,0 @@ -/* - * pthread_timechange_handler_np.c - * - * Description: - * This translation unit implements miscellaneous thread functions. - * - * -------------------------------------------------------------------------- - * - * 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" - -/* - * Notes on handling system time adjustments (especially negative ones). - * --------------------------------------------------------------------- - * - * This solution was suggested by Alexander Terekhov, but any errors - * in the implementation are mine - [Ross Johnson] - * - * 1) The problem: threads doing a timedwait on a CV may expect to timeout - * at a specific absolute time according to a system timer. If the - * system clock is adjusted backwards then those threads sleep longer than - * expected. Also, pthreads-win32 converts absolute times to intervals in - * order to make use of the underlying Win32, and so waiting threads may - * awake before their proper abstimes. - * - * 2) We aren't able to distinquish between threads on timed or untimed waits, - * so we wake them all at the time of the adjustment so that they can - * re-evaluate their conditions and re-compute their timeouts. - * - * 3) We rely on correctly written applications for this to work. Specifically, - * they must be able to deal properly with spurious wakeups. That is, - * they must re-test their condition upon wakeup and wait again if - * the condition is not satisfied. - */ - -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); -} |