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+/*
+ * np_delay.c
+ *
+ * Description:
+ * This translation unit implements non-portable thread functions.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      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
+ */
+
+#include "pthread.h"
+#include "implement.h"
+
+/*
+ * pthread_delay_np
+ *
+ * DESCRIPTION
+ *
+ *       This routine causes a thread to delay execution for a specific period of time.
+ *       This period ends at the current time plus the specified interval. The routine
+ *       will not return before the end of the period is reached, but may return an
+ *       arbitrary amount of time after the period has gone by. This can be due to
+ *       system load, thread priorities, and system timer granularity. 
+ *
+ *       Specifying an interval of zero (0) seconds and zero (0) nanoseconds is
+ *       allowed and can be used to force the thread to give up the processor or to
+ *       deliver a pending cancelation request. 
+ *
+ *       The timespec structure contains the following two fields: 
+ *
+ *            tv_sec is an integer number of seconds. 
+ *            tv_nsec is an integer number of nanoseconds. 
+ *
+ *  Return Values
+ *
+ *  If an error condition occurs, this routine returns an integer value indicating
+ *  the type of error. Possible return values are as follows: 
+ *
+ *  0 
+ *           Successful completion.
+ *  [EINVAL] 
+ *           The value specified by interval is invalid. 
+ *
+ * Example
+ *
+ * The following code segment would wait for 5 and 1/2 seconds
+ *
+ *  struct timespec tsWait;
+ *  int      intRC;
+ *
+ *  tsWait.tv_sec  = 5;
+ *  tsWait.tv_nsec = 500000000L;
+ *  intRC = pthread_delay_np(&tsWait);
+ */
+int
+pthread_delay_np (struct timespec * interval)
+{
+  DWORD wait_time;
+  DWORD secs_in_millisecs;
+  DWORD millisecs;
+  DWORD status;
+  pthread_t self;
+
+  if (interval == NULL)
+    {
+      return EINVAL;
+    }
+
+  if (interval->tv_sec == 0L && interval->tv_nsec == 0L)
+    {
+      pthread_testcancel();
+      Sleep(0);
+      pthread_testcancel();
+      return (0);
+    }
+
+  /* convert secs to millisecs */
+  secs_in_millisecs = interval->tv_sec * 1000L;
+
+  /* convert nanosecs to millisecs (rounding up) */
+  millisecs = (interval->tv_nsec + 999999L) / 1000000L;
+
+  if (0 > (wait_time = secs_in_millisecs + millisecs))
+    {
+      return EINVAL;
+    }
+
+  if (NULL == (self = pthread_self()))
+    {
+      return ENOMEM;
+    }
+
+  if (self->cancelState == PTHREAD_CANCEL_ENABLE)
+    {
+      /*
+       * Async cancelation won't catch us until wait_time is up.
+       * Deferred cancelation will cancel us immediately.
+       */
+      if (WAIT_OBJECT_0 ==
+          (status = WaitForSingleObject(self->cancelEvent, wait_time)) )
+        {
+          /*
+           * Canceling!
+           */
+          (void) pthread_mutex_lock(&self->cancelLock);
+          if (self->state < PThreadStateCanceling)
+            {
+              self->state = PThreadStateCanceling;
+              self->cancelState = PTHREAD_CANCEL_DISABLE;
+              (void) pthread_mutex_unlock(&self->cancelLock);
+
+              ptw32_throw(PTW32_EPS_CANCEL);
+            }
+
+          (void) pthread_mutex_unlock(&self->cancelLock);
+          return ESRCH;
+        }
+      else if (status != WAIT_TIMEOUT)
+        {
+          return EINVAL;
+        }
+    }
+  else
+    {
+      Sleep( wait_time );
+    }
+
+  return (0);
+}