Major reorganisation of source code; new routine and tests added.

1 files changed, 163 insertions, 0 deletions

diff --git a/sem_init.c b/sem_init.c
new file mode 100644
index 0000000..e36678c
--- /dev/null
+++ b/sem_init.c
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+/*
+ * -------------------------------------------------------------
+ *
+ * Module: sem_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 */