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/pthread_spin_init.c | 123 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 123 insertions(+)
 create mode 100644 pthreads/src/pthread_spin_init.c

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

diff --git a/pthreads/src/pthread_spin_init.c b/pthreads/src/pthread_spin_init.c
new file mode 100644
index 0000000..553af7e
--- /dev/null
+++ b/pthreads/src/pthread_spin_init.c
@@ -0,0 +1,123 @@
+/*
+ * pthread_spin_init.c
+ *
+ * Description:
+ * This translation unit implements spin lock primitives.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      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 "implement.h"
+
+
+int
+pthread_spin_init (pthread_spinlock_t * lock, int pshared)
+{
+  pthread_spinlock_t s;
+  int cpus = 0;
+  int result = 0;
+
+  if (lock == NULL)
+    {
+      return EINVAL;
+    }
+
+  if (0 != ptw32_getprocessors (&cpus))
+    {
+      cpus = 1;
+    }
+
+  if (cpus > 1)
+    {
+      if (pshared == PTHREAD_PROCESS_SHARED)
+	{
+	  /*
+	   * Creating spinlock that can be shared between
+	   * processes.
+	   */
+#if _POSIX_THREAD_PROCESS_SHARED >= 0
+
+	  /*
+	   * Not implemented yet.
+	   */
+
+#error ERROR [__FILE__, line __LINE__]: Process shared spin locks are not supported yet.
+
+#else
+
+	  return ENOSYS;
+
+#endif /* _POSIX_THREAD_PROCESS_SHARED */
+
+	}
+    }
+
+  s = (pthread_spinlock_t) calloc (1, sizeof (*s));
+
+  if (s == NULL)
+    {
+      return ENOMEM;
+    }
+
+  if (cpus > 1)
+    {
+      s->u.cpus = cpus;
+      s->interlock = PTW32_SPIN_UNLOCKED;
+    }
+  else
+    {
+      pthread_mutexattr_t ma;
+      result = pthread_mutexattr_init (&ma);
+
+      if (0 == result)
+	{
+	  ma->pshared = pshared;
+	  result = pthread_mutex_init (&(s->u.mutex), &ma);
+	  if (0 == result)
+	    {
+	      s->interlock = PTW32_SPIN_USE_MUTEX;
+	    }
+	}
+      (void) pthread_mutexattr_destroy (&ma);
+    }
+
+  if (0 == result)
+    {
+      *lock = s;
+    }
+  else
+    {
+      (void) free (s);
+      *lock = NULL;
+    }
+
+  return (result);
+}
-- 
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