From 2ab3d99967d68c79351fe2a3df22c445447e3010 Mon Sep 17 00:00:00 2001
From: Michał Cichoń <michcic@gmail.com>
Date: Tue, 15 Nov 2011 22:28:48 +0100
Subject: Initial import.

---
 pthreads/src/sem_init.c | 169 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 169 insertions(+)
 create mode 100644 pthreads/src/sem_init.c

(limited to 'pthreads/src/sem_init.c')

diff --git a/pthreads/src/sem_init.c b/pthreads/src/sem_init.c
new file mode 100644
index 0000000..f682f4b
--- /dev/null
+++ b/pthreads/src/sem_init.c
@@ -0,0 +1,169 @@
+/*
+ * -------------------------------------------------------------
+ *
+ * Module: sem_init.c
+ *
+ * Purpose:
+ *	Semaphores aren't actually part of PThreads.
+ *	They are defined by the POSIX Standard:
+ *
+ *		POSIX 1003.1-2001
+ *
+ * -------------------------------------------------------------
+ *
+ *      Pthreads-win32 - POSIX Threads Library for Win32
+ *      Copyright(C) 1998 John E. Bossom
+ *      Copyright(C) 1999,2005 Pthreads-win32 contributors
+ * 
+ *      Contact Email: rpj@callisto.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_init (sem_t * sem, int pshared, unsigned int value)
+     /*
+      * ------------------------------------------------------
+      * DOCPUBLIC
+      *      This function initializes a 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 a 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, or
+      *                              'value' >= SEM_VALUE_MAX
+      *              ENOMEM          out of memory,
+      *              ENOSPC          a required resource has been exhausted,
+      *              ENOSYS          semaphores are not supported,
+      *              EPERM           the process lacks appropriate privilege
+      *
+      * ------------------------------------------------------
+      */
+{
+  int result = 0;
+  sem_t s = NULL;
+
+  if (pshared != 0)
+    {
+      /*
+       * Creating a semaphore that can be shared between
+       * processes
+       */
+      result = EPERM;
+    }
+  else if (value > (unsigned int)SEM_VALUE_MAX)
+    {
+      result = EINVAL;
+    }
+  else
+    {
+      s = (sem_t) calloc (1, sizeof (*s));
+
+      if (NULL == s)
+	{
+	  result = ENOMEM;
+	}
+      else
+	{
+
+	  s->value = value;
+	  if (pthread_mutex_init(&s->lock, NULL) == 0)
+	    {
+
+#if defined(NEED_SEM)
+
+	  s->sem = CreateEvent (NULL,
+				PTW32_FALSE,	/* auto (not manual) reset */
+				PTW32_FALSE,	/* initial state is unset */
+				NULL);
+
+	  if (0 == s->sem)
+	    {
+	      free (s);
+	      (void) pthread_mutex_destroy(&s->lock);
+	      result = ENOSPC;
+	    }
+	  else
+	    {
+	      s->leftToUnblock = 0;
+	    }
+
+#else /* NEED_SEM */
+
+	      if ((s->sem = CreateSemaphore (NULL,	/* Always NULL */
+					     (long) 0,	/* Force threads to wait */
+					     (long) SEM_VALUE_MAX,	/* Maximum value */
+					     NULL)) == 0)	/* Name */
+		{
+		  (void) pthread_mutex_destroy(&s->lock);
+		  result = ENOSPC;
+		}
+
+#endif /* NEED_SEM */
+
+	    }
+	  else
+	    {
+	      result = ENOSPC;
+	    }
+
+	  if (result != 0)
+	    {
+	      free(s);
+	    }
+	}
+    }
+
+  if (result != 0)
+    {
+      errno = result;
+      return -1;
+    }
+
+  *sem = s;
+
+  return 0;
+
+}				/* sem_init */
-- 
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