From a416ab17ecf9f2cb0f1e3f7bd645a8d1ce690ca2 Mon Sep 17 00:00:00 2001
From: rpj <rpj>
Date: Mon, 18 Feb 2002 03:16:52 +0000
Subject: Major reorganisation of source code; new routine and tests added.

---
 sem_getvalue.c | 124 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 sem_getvalue.c

(limited to 'sem_getvalue.c')

diff --git a/sem_getvalue.c b/sem_getvalue.c
new file mode 100644
index 0000000..abc76c0
--- /dev/null
+++ b/sem_getvalue.c
@@ -0,0 +1,124 @@
+/*
+ * -------------------------------------------------------------
+ *
+ * Module: sem_getvalue.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_getvalue(sem_t * sem, int * sval)
+     /*
+      * ------------------------------------------------------
+      * DOCPUBLIC
+      *      This function stores the current count value of the
+      *      semaphore.
+      * RESULTS
+      *
+      * Return value
+      *
+      *       0                  sval has been set.
+      *      -1                  failed, error in errno
+      *
+      *  in global errno
+      *
+      *      EINVAL              'sem' is not a valid semaphore,
+      *      ENOSYS              this function is not supported,
+      *
+      *
+      * PARAMETERS
+      *
+      *      sem                 pointer to an instance of sem_t
+      *
+      *      sval                pointer to int.
+      *
+      * DESCRIPTION
+      *      This function stores the current count value of the semaphore
+      *      pointed to by sem in the int pointed to by sval.
+      */
+{
+  int result = 0;
+ 
+  if ( sem == NULL || *sem == NULL || sval == NULL )
+    {
+      result = EINVAL;
+    }
+  else
+    {
+
+#ifdef NEED_SEM
+ 
+      result = ENOSYS;
+ 
+#else
+      long value = *sval;
+ 
+      /* Note:
+       *  The windows NT documentation says that the increment must be
+       *  greater than zero, but it is set to zero here. If this works,
+       *  the function will return true. If not, we can't do it this way
+       *  so flag it as not implemented.
+       */
+
+      if ( ReleaseSemaphore( (*sem)->sem, 0L, &value) )
+        {
+          *sval = value;
+        }
+      else
+        {
+          result = ENOSYS;
+        }
+ 
+#endif
+    }
+ 
+ 
+  if ( result != 0 )
+    {
+      errno = result;
+      return -1;
+    }
+ 
+  return 0;
+ 
+}   /* sem_getvalue */
-- 
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