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authormarha <marha@users.sourceforge.net>2011-07-18 10:33:05 +0200
committermarha <marha@users.sourceforge.net>2011-07-18 10:33:05 +0200
commit88101146f2ec7d53ffb793e365f05097ffd35fd3 (patch)
treedb77eef572a00c62c8d9485c4786f682e20a2fd0 /pthreads/pthread_cancel.c
parent772373ccc8da2b2019555228f4972cc0c5a885a4 (diff)
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cvs version of pthreads
Diffstat (limited to 'pthreads/pthread_cancel.c')
-rw-r--r--pthreads/pthread_cancel.c377
1 files changed, 189 insertions, 188 deletions
diff --git a/pthreads/pthread_cancel.c b/pthreads/pthread_cancel.c
index d1f281bb0..ae60b7293 100644
--- a/pthreads/pthread_cancel.c
+++ b/pthreads/pthread_cancel.c
@@ -1,188 +1,189 @@
-/*
- * 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);
-}
+/*
+ * 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 (ULONG_PTR 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;
+ ptw32_mcs_local_node_t stateLock;
+
+ 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.
+ */
+ ptw32_mcs_lock_acquire (&tp->stateLock, &stateLock);
+
+ 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;
+
+ ptw32_mcs_lock_release (&stateLock);
+ 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 ((PAPCFUNC)ptw32_cancel_callback, threadH, 0);
+ ptw32_mcs_lock_release (&stateLock);
+ 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;
+ }
+
+ ptw32_mcs_lock_release (&stateLock);
+ }
+
+ return (result);
+}