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/ptw32_mutex_check_need_init.c | 92 ++++++++++++++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 pthreads/src/ptw32_mutex_check_need_init.c

(limited to 'pthreads/src/ptw32_mutex_check_need_init.c')

diff --git a/pthreads/src/ptw32_mutex_check_need_init.c b/pthreads/src/ptw32_mutex_check_need_init.c
new file mode 100644
index 0000000..897db3c
--- /dev/null
+++ b/pthreads/src/ptw32_mutex_check_need_init.c
@@ -0,0 +1,92 @@
+/*
+ * ptw32_mutex_check_need_init.c
+ *
+ * Description:
+ * This translation unit implements mutual exclusion (mutex) 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"
+
+static struct pthread_mutexattr_t_ ptw32_recursive_mutexattr_s =
+  {PTHREAD_PROCESS_PRIVATE, PTHREAD_MUTEX_RECURSIVE};
+static struct pthread_mutexattr_t_ ptw32_errorcheck_mutexattr_s =
+  {PTHREAD_PROCESS_PRIVATE, PTHREAD_MUTEX_ERRORCHECK};
+static pthread_mutexattr_t ptw32_recursive_mutexattr = &ptw32_recursive_mutexattr_s;
+static pthread_mutexattr_t ptw32_errorcheck_mutexattr = &ptw32_errorcheck_mutexattr_s;
+
+
+INLINE int
+ptw32_mutex_check_need_init (pthread_mutex_t * mutex)
+{
+  register int result = 0;
+  register pthread_mutex_t mtx;
+  ptw32_mcs_local_node_t node;
+
+  ptw32_mcs_lock_acquire(&ptw32_mutex_test_init_lock, &node);
+
+  /*
+   * We got here possibly under race
+   * conditions. Check again inside the critical section
+   * and only initialise if the mutex is valid (not been destroyed).
+   * If a static mutex has been destroyed, the application can
+   * re-initialise it only by calling pthread_mutex_init()
+   * explicitly.
+   */
+  mtx = *mutex;
+
+  if (mtx == PTHREAD_MUTEX_INITIALIZER)
+    {
+      result = pthread_mutex_init (mutex, NULL);
+    }
+  else if (mtx == PTHREAD_RECURSIVE_MUTEX_INITIALIZER)
+    {
+      result = pthread_mutex_init (mutex, &ptw32_recursive_mutexattr);
+    }
+  else if (mtx == PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
+    {
+      result = pthread_mutex_init (mutex, &ptw32_errorcheck_mutexattr);
+    }
+  else if (mtx == NULL)
+    {
+      /*
+       * The mutex has been destroyed while we were waiting to
+       * initialise it, so the operation that caused the
+       * auto-initialisation should fail.
+       */
+      result = EINVAL;
+    }
+
+  ptw32_mcs_lock_release(&node);
+
+  return (result);
+}
-- 
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