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_wait.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 sem_wait.c

(limited to 'sem_wait.c')

diff --git a/sem_wait.c b/sem_wait.c
new file mode 100644
index 0000000..5095241
--- /dev/null
+++ b/sem_wait.c
@@ -0,0 +1,115 @@
+/*
+ * -------------------------------------------------------------
+ *
+ * Module: sem_wait.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_wait (sem_t * sem)
+     /*
+      * ------------------------------------------------------
+      * DOCPUBLIC
+      *      This function  waits on a semaphore.
+      *
+      * PARAMETERS
+      *      sem
+      * 	     pointer to an instance of sem_t
+      *
+      * DESCRIPTION
+      *      This function waits on a semaphore. If the
+      *      semaphore value is greater than zero, it decreases
+      *      its value by one. If the semaphore value is zero, then
+      *      the calling thread (or process) is blocked until it can
+      *      successfully decrease the value or until interrupted by
+      *      a signal.
+      *
+      * RESULTS
+      * 	     0		     successfully decreased semaphore,
+      * 	     -1 	     failed, error in errno
+      * ERRNO
+      * 	     EINVAL	     'sem' is not a valid semaphore,
+      * 	     ENOSYS	     semaphores are not supported,
+      * 	     EINTR	     the function was interrupted by a signal,
+      * 	     EDEADLK	     a deadlock condition was detected.
+      *
+      * ------------------------------------------------------
+      */
+{
+  int result = 0;
+
+  if (sem == NULL || *sem == NULL)
+    {
+      result = EINVAL;
+    }
+  else
+    {
+
+#ifdef NEED_SEM
+
+	result = pthreadCancelableWait ((*sem)->event);
+
+#else /* NEED_SEM */
+
+	result = pthreadCancelableWait ((*sem)->sem);
+
+#endif /* NEED_SEM */
+
+    }
+
+  if (result != 0)
+    {
+      errno = result;
+      return -1;
+    }
+
+#ifdef NEED_SEM
+
+  ptw32_decrease_semaphore(sem);
+
+#endif /* NEED_SEM */
+
+  return 0;
+
+}				/* sem_wait */
-- 
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