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authorrpj <rpj>2002-02-11 01:53:22 +0000
committerrpj <rpj>2002-02-11 01:53:22 +0000
commite6f1797e9e9925ae7f9dda54806ef8f52ae3ed07 (patch)
treec513bf622584d48383ce9d167159c81baa71b3f9 /condvar_attr_getpshared.c
parent1cf6fdda9842e5b728cdce93683292f4380a4572 (diff)
Splitting files. See ChangeLog file for details.
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+/*
+ * condvar_attr_getpshared.c
+ *
+ * Description:
+ * This translation unit implements condition variables and their primitives.
+ *
+ *
+ * --------------------------------------------------------------------------
+ *
+ * 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 "implement.h"
+
+
+int
+pthread_condattr_getpshared (const pthread_condattr_t * attr, int *pshared)
+ /*
+ * ------------------------------------------------------
+ * DOCPUBLIC
+ * Determine whether condition variables created with 'attr'
+ * can be shared between processes.
+ *
+ * PARAMETERS
+ * attr
+ * pointer to an instance of pthread_condattr_t
+ *
+ * pshared
+ * will be set to one of:
+ *
+ * PTHREAD_PROCESS_SHARED
+ * May be shared if in shared memory
+ *
+ * PTHREAD_PROCESS_PRIVATE
+ * Cannot be shared.
+ *
+ *
+ * DESCRIPTION
+ * Condition Variables created with 'attr' can be shared
+ * between processes if pthread_cond_t variable is allocated
+ * in memory shared by these processes.
+ * NOTES:
+ * 1) pshared condition variables MUST be allocated in
+ * shared memory.
+ *
+ * 2) The following macro is defined if shared mutexes
+ * are supported:
+ * _POSIX_THREAD_PROCESS_SHARED
+ *
+ * RESULTS
+ * 0 successfully retrieved attribute,
+ * EINVAL 'attr' or 'pshared' is invalid,
+ *
+ * ------------------------------------------------------
+ */
+{
+ int result;
+
+ if ((attr != NULL && *attr != NULL) && (pshared != NULL))
+ {
+ *pshared = (*attr)->pshared;
+ result = 0;
+ }
+ else
+ {
+ result = EINVAL;
+ }
+
+ return result;
+
+} /* pthread_condattr_getpshared */