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/w32_CancelableWait.c | 161 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 161 insertions(+)
 create mode 100644 pthreads/src/w32_CancelableWait.c

(limited to 'pthreads/src/w32_CancelableWait.c')

diff --git a/pthreads/src/w32_CancelableWait.c b/pthreads/src/w32_CancelableWait.c
new file mode 100644
index 0000000..070633e
--- /dev/null
+++ b/pthreads/src/w32_CancelableWait.c
@@ -0,0 +1,161 @@
+/*
+ * w32_CancelableWait.c
+ *
+ * Description:
+ * This translation unit implements miscellaneous thread functions.
+ *
+ * --------------------------------------------------------------------------
+ *
+ *      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 INLINE int
+ptw32_cancelable_wait (HANDLE waitHandle, DWORD timeout)
+     /*
+      * -------------------------------------------------------------------
+      * This provides an extra hook into the pthread_cancel
+      * mechanism that will allow you to wait on a Windows handle and make it a
+      * cancellation point. This function blocks until the given WIN32 handle is
+      * signaled or pthread_cancel has been called. It is implemented using
+      * WaitForMultipleObjects on 'waitHandle' and a manually reset WIN32
+      * event used to implement pthread_cancel.
+      * 
+      * Given this hook it would be possible to implement more of the cancellation
+      * points.
+      * -------------------------------------------------------------------
+      */
+{
+  int result;
+  pthread_t self;
+  ptw32_thread_t * sp;
+  HANDLE handles[2];
+  DWORD nHandles = 1;
+  DWORD status;
+
+  handles[0] = waitHandle;
+
+  self = pthread_self();
+  sp = (ptw32_thread_t *) self.p;
+
+  if (sp != NULL)
+    {
+      /*
+       * Get cancelEvent handle
+       */
+      if (sp->cancelState == PTHREAD_CANCEL_ENABLE)
+	{
+
+	  if ((handles[1] = sp->cancelEvent) != NULL)
+	    {
+	      nHandles++;
+	    }
+	}
+    }
+  else
+    {
+      handles[1] = NULL;
+    }
+
+  status = WaitForMultipleObjects (nHandles, handles, PTW32_FALSE, timeout);
+
+  switch (status - WAIT_OBJECT_0)
+    {
+    case 0:
+      /*
+       * Got the handle.
+       * In the event that both handles are signalled, the smallest index
+       * value (us) is returned. As it has been arranged, this ensures that
+       * we don't drop a signal that we should act on (i.e. semaphore,
+       * mutex, or condition variable etc).
+       */
+      result = 0;
+      break;
+
+    case 1:
+      /*
+       * Got cancel request.
+       * In the event that both handles are signaled, the cancel will
+       * be ignored (see case 0 comment).
+       */
+      ResetEvent (handles[1]);
+
+      if (sp != NULL)
+	{
+          ptw32_mcs_local_node_t stateLock;
+	  /*
+	   * Should handle POSIX and implicit POSIX threads..
+	   * Make sure we haven't been async-canceled in the meantime.
+	   */
+	  ptw32_mcs_lock_acquire (&sp->stateLock, &stateLock);
+	  if (sp->state < PThreadStateCanceling)
+	    {
+	      sp->state = PThreadStateCanceling;
+	      sp->cancelState = PTHREAD_CANCEL_DISABLE;
+	      ptw32_mcs_lock_release (&stateLock);
+	      ptw32_throw (PTW32_EPS_CANCEL);
+
+	      /* Never reached */
+	    }
+	  ptw32_mcs_lock_release (&stateLock);
+	}
+
+      /* Should never get to here. */
+      result = EINVAL;
+      break;
+
+    default:
+      if (status == WAIT_TIMEOUT)
+	{
+	  result = ETIMEDOUT;
+	}
+      else
+	{
+	  result = EINVAL;
+	}
+      break;
+    }
+
+  return (result);
+
+}				/* CancelableWait */
+
+int
+pthreadCancelableWait (HANDLE waitHandle)
+{
+  return (ptw32_cancelable_wait (waitHandle, INFINITE));
+}
+
+int
+pthreadCancelableTimedWait (HANDLE waitHandle, DWORD timeout)
+{
+  return (ptw32_cancelable_wait (waitHandle, timeout));
+}
-- 
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