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Diffstat (limited to 'semaphore_trywait.c')
-rw-r--r-- | semaphore_trywait.c | 110 |
1 files changed, 0 insertions, 110 deletions
diff --git a/semaphore_trywait.c b/semaphore_trywait.c deleted file mode 100644 index 6b20d38..0000000 --- a/semaphore_trywait.c +++ /dev/null @@ -1,110 +0,0 @@ -/* - * ------------------------------------------------------------- - * - * Module: semaphore.c - * - * Purpose: - * Semaphores aren't actually part of the PThreads standard. - * They are defined by the POSIX Standard: - * - * POSIX 1003.1b-1993 (POSIX.1b) - * - * ------------------------------------------------------------- - * - * -------------------------------------------------------------------------- - * - * Pthreads-win32 - POSIX Threads Library for Win32 - * Copyright(C) 1998 John E. Bossom - * Copyright(C) 1999,2002 Pthreads-win32 contributors - * - * Contact Email: rpj@ise.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 "semaphore.h" -#include "implement.h" - - -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. - * - * ------------------------------------------------------ - */ -{ -#ifdef NEED_SEM - - /* - * not yet implemented! - */ - errno = ENOTSUP; - return -1; - -#else /* NEED_SEM */ - - int result = 0; - - if (sem == NULL || *sem == NULL) - { - result = EINVAL; - } - else if (WaitForSingleObject ((*sem)->sem, 0) == WAIT_TIMEOUT) - { - result = EAGAIN; - } - - if (result != 0) - { - errno = result; - return -1; - } - - return 0; - -#endif /* NEED_SEM */ - -} /* sem_trywait */ |