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-rw-r--r--semaphore_init.c163
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diff --git a/semaphore_init.c b/semaphore_init.c
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-/*
- * -------------------------------------------------------------
- *
- * Module: semaphore_init.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
- */
-
-#ifndef _UWIN
-# include <process.h>
-#endif
-
-#include "pthread.h"
-#include "semaphore.h"
-#include "implement.h"
-
-#include <limits.h>
-
-int
-sem_init (sem_t * sem, int pshared, unsigned int value)
- /*
- * ------------------------------------------------------
- * DOCPUBLIC
- * This function initializes an unnamed semaphore. the
- * initial value of the semaphore is 'value'
- *
- * PARAMETERS
- * sem
- * pointer to an instance of sem_t
- *
- * pshared
- * if zero, this semaphore may only be shared between
- * threads in the same process.
- * if nonzero, the semaphore can be shared between
- * processes
- *
- * value
- * initial value of the semaphore counter
- *
- * DESCRIPTION
- * This function initializes an unnamed semaphore. The
- * initial value of the semaphore is set to 'value'.
- *
- * RESULTS
- * 0 successfully created semaphore,
- * -1 failed, error in errno
- * ERRNO
- * EINVAL 'sem' is not a valid semaphore,
- * ENOSPC a required resource has been exhausted,
- * ENOSYS semaphores are not supported,
- * EPERM the process lacks appropriate privilege
- *
- * ------------------------------------------------------
- */
-{
- int result = 0;
- sem_t s;
-
- if (pshared != 0)
- {
- /*
- * Creating a semaphore that can be shared between
- * processes
- */
- result = EPERM;
-
- }
- else
- {
-
- s = (sem_t) calloc (1, sizeof (*s));
-
- if (NULL == s)
- {
- result = ENOMEM;
- }
-
-#ifdef NEED_SEM
-
- else
- {
- s->value = value;
- s->event = CreateEvent (NULL,
- FALSE, /* manual reset */
- FALSE, /* initial state */
- NULL);
- if (0 == s->event)
- {
- result = ENOSPC;
- }
- else
- {
- if (value != 0)
- {
- SetEvent(s->event);
- }
-
- InitializeCriticalSection(&s->sem_lock_cs);
- }
- }
-
-#else /* NEED_SEM */
-
- s->sem = CreateSemaphore (NULL, /* Always NULL */
- value, /* Initial value */
- INT_MAX, /* Maximum value */
- NULL); /* Name */
-
- if (0 == s->sem)
- {
- result = ENOSPC;
- }
-
-#endif /* NEED_SEM */
-
- }
-
- if (result != 0)
- {
- errno = result;
- return -1;
- }
-
- *sem = s;
-
- return 0;
-
-} /* sem_init */