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Diffstat (limited to 'pthreads/pthread_mutex_timedlock.c')
| -rw-r--r-- | pthreads/pthread_mutex_timedlock.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/pthreads/pthread_mutex_timedlock.c b/pthreads/pthread_mutex_timedlock.c new file mode 100644 index 000000000..a2385522d --- /dev/null +++ b/pthreads/pthread_mutex_timedlock.c @@ -0,0 +1,196 @@ +/* + * pthread_mutex_timedlock.c + * + * Description: + * This translation unit implements mutual exclusion (mutex) 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" + + +static INLINE int +ptw32_timed_eventwait (HANDLE event, const struct timespec *abstime) + /* + * ------------------------------------------------------ + * DESCRIPTION + * This function waits on an event until signaled or until + * abstime passes. + * If abstime has passed when this routine is called then + * it returns a result to indicate this. + * + * If 'abstime' is a NULL pointer then this function will + * block until it can successfully decrease the value or + * until interrupted by a signal. + * + * This routine is not a cancelation point. + * + * RESULTS + * 0 successfully signaled, + * ETIMEDOUT abstime passed + * EINVAL 'event' is not a valid event, + * + * ------------------------------------------------------ + */ +{ + + DWORD milliseconds; + DWORD status; + + if (event == NULL) + { + return EINVAL; + } + else + { + if (abstime == NULL) + { + milliseconds = INFINITE; + } + else + { + /* + * Calculate timeout as milliseconds from current system time. + */ + milliseconds = ptw32_relmillisecs (abstime); + } + + status = WaitForSingleObject (event, milliseconds); + + if (status == WAIT_OBJECT_0) + { + return 0; + } + else if (status == WAIT_TIMEOUT) + { + return ETIMEDOUT; + } + else + { + return EINVAL; + } + } + + return 0; + +} /* ptw32_timed_semwait */ + + +int +pthread_mutex_timedlock (pthread_mutex_t * mutex, + const struct timespec *abstime) +{ + int result; + pthread_mutex_t mx; + + /* + * Let the system deal with invalid pointers. + */ + + /* + * We do a quick check to see if we need to do more work + * to initialise a static mutex. We check + * again inside the guarded section of ptw32_mutex_check_need_init() + * to avoid race conditions. + */ + if (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER) + { + if ((result = ptw32_mutex_check_need_init (mutex)) != 0) + { + return (result); + } + } + + mx = *mutex; + + if (mx->kind == PTHREAD_MUTEX_NORMAL) + { + if ((LONG) PTW32_INTERLOCKED_EXCHANGE( + (LPLONG) &mx->lock_idx, + (LONG) 1) != 0) + { + while ((LONG) PTW32_INTERLOCKED_EXCHANGE( + (LPLONG) &mx->lock_idx, + (LONG) -1) != 0) + { + if (0 != (result = ptw32_timed_eventwait (mx->event, abstime))) + { + return result; + } + } + } + } + else + { + pthread_t self = pthread_self(); + + if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_COMPARE_EXCHANGE( + (PTW32_INTERLOCKED_LPLONG) &mx->lock_idx, + (PTW32_INTERLOCKED_LONG) 1, + (PTW32_INTERLOCKED_LONG) 0) == 0) + { + mx->recursive_count = 1; + mx->ownerThread = self; + } + else + { + if (pthread_equal (mx->ownerThread, self)) + { + if (mx->kind == PTHREAD_MUTEX_RECURSIVE) + { + mx->recursive_count++; + } + else + { + return EDEADLK; + } + } + else + { + while ((LONG) PTW32_INTERLOCKED_EXCHANGE( + (LPLONG) &mx->lock_idx, + (LONG) -1) != 0) + { + if (0 != (result = ptw32_timed_eventwait (mx->event, abstime))) + { + return result; + } + } + + mx->recursive_count = 1; + mx->ownerThread = self; + } + } + } + + return 0; +} |