cvs update pthreads

1 files changed, 188 insertions, 223 deletions

diff --git a/pthreads/pthread_cancel.c b/pthreads/pthread_cancel.c
index 1118977ee..d1f281bb0 100644
--- a/pthreads/pthread_cancel.c
+++ b/pthreads/pthread_cancel.c
@@ -1,223 +1,188 @@
-/*
- * pthread_cancel.c
- *
- * Description:
- * POSIX thread functions related to thread cancellation.
- *
- * --------------------------------------------------------------------------
- *
- *      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"
-
-#if defined(_M_IX86) || defined(_X86_)
-#define PTW32_PROGCTR(Context)  ((Context).Eip)
-#endif
-
-#if defined (_M_IA64)
-#define PTW32_PROGCTR(Context)  ((Context).StIIP)
-#endif
-
-#if defined(_MIPS_)
-#define PTW32_PROGCTR(Context)  ((Context).Fir)
-#endif
-
-#if defined(_ALPHA_)
-#define PTW32_PROGCTR(Context)  ((Context).Fir)
-#endif
-
-#if defined(_PPC_)
-#define PTW32_PROGCTR(Context)  ((Context).Iar)
-#endif
-
-#if defined(_AMD64_)
-#define PTW32_PROGCTR(Context)  ((Context).Rip)
-#endif
-
-#if !defined(PTW32_PROGCTR)
-#error Module contains CPU-specific code; modify and recompile.
-#endif
-
-static void
-ptw32_cancel_self (void)
-{
-  ptw32_throw (PTW32_EPS_CANCEL);
-
-  /* Never reached */
-}
-
-static void CALLBACK
-ptw32_cancel_callback (DWORD unused)
-{
-  ptw32_throw (PTW32_EPS_CANCEL);
-
-  /* Never reached */
-}
-
-/*
- * ptw32_RegisterCancelation() -
- * Must have args of same type as QueueUserAPCEx because this function
- * is a substitute for QueueUserAPCEx if it's not available.
- */
-DWORD
-ptw32_RegisterCancelation (PAPCFUNC unused1, HANDLE threadH, DWORD unused2)
-{
-  CONTEXT context;
-
-  context.ContextFlags = CONTEXT_CONTROL;
-  GetThreadContext (threadH, &context);
-  PTW32_PROGCTR (context) = (DWORD_PTR) ptw32_cancel_self;
-  SetThreadContext (threadH, &context);
-  return 0;
-}
-
-int
-pthread_cancel (pthread_t thread)
-     /*
-      * ------------------------------------------------------
-      * DOCPUBLIC
-      *      This function requests cancellation of 'thread'.
-      *
-      * PARAMETERS
-      *      thread
-      *              reference to an instance of pthread_t
-      *
-      *
-      * DESCRIPTION
-      *      This function requests cancellation of 'thread'.
-      *      NOTE: cancellation is asynchronous; use pthread_join to
-      *                wait for termination of 'thread' if necessary.
-      *
-      * RESULTS
-      *              0               successfully requested cancellation,
-      *              ESRCH           no thread found corresponding to 'thread',
-      *              ENOMEM          implicit self thread create failed.
-      * ------------------------------------------------------
-      */
-{
-  int result;
-  int cancel_self;
-  pthread_t self;
-  ptw32_thread_t * tp;
-
-  result = pthread_kill (thread, 0);
-
-  if (0 != result)
-    {
-      return result;
-    }
-
-  if ((self = pthread_self ()).p == NULL)
-    {
-      return ENOMEM;
-    };
-
-  /*
-   * FIXME!!
-   *
-   * Can a thread cancel itself?
-   *
-   * The standard doesn't
-   * specify an error to be returned if the target
-   * thread is itself.
-   *
-   * If it may, then we need to ensure that a thread can't
-   * deadlock itself trying to cancel itself asyncronously
-   * (pthread_cancel is required to be an async-cancel
-   * safe function).
-   */
-  cancel_self = pthread_equal (thread, self);
-
-  tp = (ptw32_thread_t *) thread.p;
-
-  /*
-   * Lock for async-cancel safety.
-   */
-  (void) pthread_mutex_lock (&tp->cancelLock);
-
-  if (tp->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS
-      && tp->cancelState == PTHREAD_CANCEL_ENABLE
-      && tp->state < PThreadStateCanceling)
-    {
-      if (cancel_self)
-	{
-	  tp->state = PThreadStateCanceling;
-	  tp->cancelState = PTHREAD_CANCEL_DISABLE;
-
-	  (void) pthread_mutex_unlock (&tp->cancelLock);
-	  ptw32_throw (PTW32_EPS_CANCEL);
-
-	  /* Never reached */
-	}
-      else
-	{
-	  HANDLE threadH = tp->threadH;
-
-	  SuspendThread (threadH);
-
-	  if (WaitForSingleObject (threadH, 0) == WAIT_TIMEOUT)
-	    {
-	      tp->state = PThreadStateCanceling;
-	      tp->cancelState = PTHREAD_CANCEL_DISABLE;
-	      /*
-	       * If alertdrv and QueueUserAPCEx is available then the following
-	       * will result in a call to QueueUserAPCEx with the args given, otherwise
-	       * this will result in a call to ptw32_RegisterCancelation and only
-	       * the threadH arg will be used.
-	       */
-	      ptw32_register_cancelation (ptw32_cancel_callback, threadH, 0);
-	      (void) pthread_mutex_unlock (&tp->cancelLock);
-	      ResumeThread (threadH);
-	    }
-	}
-    }
-  else
-    {
-      /*
-       * Set for deferred cancellation.
-       */
-      if (tp->state < PThreadStateCancelPending)
-	{
-	  tp->state = PThreadStateCancelPending;
-	  if (!SetEvent (tp->cancelEvent))
-	    {
-	      result = ESRCH;
-	    }
-	}
-      else if (tp->state >= PThreadStateCanceling)
-	{
-	  result = ESRCH;
-	}
-
-      (void) pthread_mutex_unlock (&tp->cancelLock);
-    }
-
-  return (result);
-}
+/*

+ * pthread_cancel.c

+ *

+ * Description:

+ * POSIX thread functions related to thread cancellation.

+ *

+ * --------------------------------------------------------------------------

+ *

+ *      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"

+#include "context.h"

+

+static void

+ptw32_cancel_self (void)

+{

+  ptw32_throw (PTW32_EPS_CANCEL);

+

+  /* Never reached */

+}

+

+static void CALLBACK

+ptw32_cancel_callback (DWORD unused)

+{

+  ptw32_throw (PTW32_EPS_CANCEL);

+

+  /* Never reached */

+}

+

+/*

+ * ptw32_RegisterCancelation() -

+ * Must have args of same type as QueueUserAPCEx because this function

+ * is a substitute for QueueUserAPCEx if it's not available.

+ */

+DWORD

+ptw32_RegisterCancelation (PAPCFUNC unused1, HANDLE threadH, DWORD unused2)

+{

+  CONTEXT context;

+

+  context.ContextFlags = CONTEXT_CONTROL;

+  GetThreadContext (threadH, &context);

+  PTW32_PROGCTR (context) = (DWORD_PTR) ptw32_cancel_self;

+  SetThreadContext (threadH, &context);

+  return 0;

+}

+

+int

+pthread_cancel (pthread_t thread)

+     /*

+      * ------------------------------------------------------

+      * DOCPUBLIC

+      *      This function requests cancellation of 'thread'.

+      *

+      * PARAMETERS

+      *      thread

+      *              reference to an instance of pthread_t

+      *

+      *

+      * DESCRIPTION

+      *      This function requests cancellation of 'thread'.

+      *      NOTE: cancellation is asynchronous; use pthread_join to

+      *                wait for termination of 'thread' if necessary.

+      *

+      * RESULTS

+      *              0               successfully requested cancellation,

+      *              ESRCH           no thread found corresponding to 'thread',

+      *              ENOMEM          implicit self thread create failed.

+      * ------------------------------------------------------

+      */

+{

+  int result;

+  int cancel_self;

+  pthread_t self;

+  ptw32_thread_t * tp;

+

+  result = pthread_kill (thread, 0);

+

+  if (0 != result)

+    {

+      return result;

+    }

+

+  if ((self = pthread_self ()).p == NULL)

+    {

+      return ENOMEM;

+    };

+

+  /*

+   * For self cancellation we need to ensure that a thread can't

+   * deadlock itself trying to cancel itself asynchronously

+   * (pthread_cancel is required to be an async-cancel

+   * safe function).

+   */

+  cancel_self = pthread_equal (thread, self);

+

+  tp = (ptw32_thread_t *) thread.p;

+

+  /*

+   * Lock for async-cancel safety.

+   */

+  (void) pthread_mutex_lock (&tp->cancelLock);

+

+  if (tp->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS

+      && tp->cancelState == PTHREAD_CANCEL_ENABLE

+      && tp->state < PThreadStateCanceling)

+    {

+      if (cancel_self)

+	{

+	  tp->state = PThreadStateCanceling;

+	  tp->cancelState = PTHREAD_CANCEL_DISABLE;

+

+	  (void) pthread_mutex_unlock (&tp->cancelLock);

+	  ptw32_throw (PTW32_EPS_CANCEL);

+

+	  /* Never reached */

+	}

+      else

+	{

+	  HANDLE threadH = tp->threadH;

+

+	  SuspendThread (threadH);

+

+	  if (WaitForSingleObject (threadH, 0) == WAIT_TIMEOUT)

+	    {

+	      tp->state = PThreadStateCanceling;

+	      tp->cancelState = PTHREAD_CANCEL_DISABLE;

+	      /*

+	       * If alertdrv and QueueUserAPCEx is available then the following

+	       * will result in a call to QueueUserAPCEx with the args given, otherwise

+	       * this will result in a call to ptw32_RegisterCancelation and only

+	       * the threadH arg will be used.

+	       */

+	      ptw32_register_cancelation (ptw32_cancel_callback, threadH, 0);

+	      (void) pthread_mutex_unlock (&tp->cancelLock);

+	      ResumeThread (threadH);

+	    }

+	}

+    }

+  else

+    {

+      /*

+       * Set for deferred cancellation.

+       */

+      if (tp->state < PThreadStateCancelPending)

+	{

+	  tp->state = PThreadStateCancelPending;

+	  if (!SetEvent (tp->cancelEvent))

+	    {

+	      result = ESRCH;

+	    }

+	}

+      else if (tp->state >= PThreadStateCanceling)

+	{

+	  result = ESRCH;

+	}

+

+      (void) pthread_mutex_unlock (&tp->cancelLock);

+    }

+

+  return (result);

+}