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-rw-r--r--cancel_cancel.c180
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diff --git a/cancel_cancel.c b/cancel_cancel.c
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--- a/cancel_cancel.c
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-/*
- * cancel_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) 1999,2002 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"
-
-
-#if defined(_M_IX86) || defined(_X86_)
-#define PTW32_PROGCTR(Context) ((Context).Eip)
-#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(PTW32_PROGCTR)
-#error Module contains CPU-specific code; modify and recompile.
-#endif
-
-static INLINE void
-ptw32_cancel_self(void)
-{
- ptw32_throw(PTW32_EPS_CANCEL);
-
- /* Never reached */
-}
-
-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;
-
- if (thread == NULL )
- {
- return ESRCH;
- }
-
- result = 0;
- if ((self = pthread_self()) == 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);
-
- /*
- * Lock for async-cancel safety.
- */
- (void) pthread_mutex_lock(&thread->cancelLock);
-
- if (thread->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS
- && thread->cancelState == PTHREAD_CANCEL_ENABLE
- && thread->state < PThreadStateCanceling )
- {
- if (cancel_self)
- {
- thread->state = PThreadStateCanceling;
- thread->cancelState = PTHREAD_CANCEL_DISABLE;
-
- (void) pthread_mutex_unlock(&thread->cancelLock);
- ptw32_throw(PTW32_EPS_CANCEL);
-
- /* Never reached */
- }
- else
- {
- HANDLE threadH = thread->threadH;
-
- SuspendThread(threadH);
-
- if (WaitForSingleObject(threadH, 0) == WAIT_TIMEOUT )
- {
- CONTEXT context;
-
- thread->state = PThreadStateCanceling;
- thread->cancelState = PTHREAD_CANCEL_DISABLE;
- context.ContextFlags = CONTEXT_CONTROL;
- GetThreadContext(threadH, &context);
- PTW32_PROGCTR(context) = (DWORD) ptw32_cancel_self;
- SetThreadContext(threadH, &context);
- (void) pthread_mutex_unlock(&thread->cancelLock);
- ResumeThread(threadH);
- }
- }
- }
- else
- {
- /*
- * Set for deferred cancellation.
- */
- if ( thread->state >= PThreadStateCanceling
- || !SetEvent (thread->cancelEvent))
- {
- result = ESRCH;
- }
-
- (void) pthread_mutex_unlock(&thread->cancelLock);
- }
-
- return (result);
-}
-