1 files changed, 112 insertions, 0 deletions
diff --git a/pthreads/ptw32_mutex_check_need_init.c b/pthreads/ptw32_mutex_check_need_init.c
new file mode 100644
index 000000000..35ec366bd
--- /dev/null
+++ b/pthreads/ptw32_mutex_check_need_init.c
@@ -0,0 +1,112 @@
+/*
+ * 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;
+
+  /*
+   * The following guarded test is specifically for statically
+   * initialised mutexes (via PTHREAD_MUTEX_INITIALIZER).
+   *
+   * Note that by not providing this synchronisation we risk
+   * introducing race conditions into applications which are
+   * correctly written.
+   *
+   * Approach
+   * --------
+   * We know that static mutexes will not be PROCESS_SHARED
+   * so we can serialise access to internal state using
+   * Win32 Critical Sections rather than Win32 Mutexes.
+   *
+   * If using a single global lock slows applications down too much,
+   * multiple global locks could be created and hashed on some random
+   * value associated with each mutex, the pointer perhaps. At a guess,
+   * a good value for the optimal number of global locks might be
+   * the number of processors + 1.
+   *
+   */
+  EnterCriticalSection (&ptw32_mutex_test_init_lock);
+
+  /*
+   * 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;
+    }
+
+  LeaveCriticalSection (&ptw32_mutex_test_init_lock);
+
+  return (result);
+}