diff options
Diffstat (limited to 'win32/contrib/pthreads/cancel.c')
| -rw-r--r-- | win32/contrib/pthreads/cancel.c | 388 |
1 files changed, 0 insertions, 388 deletions
diff --git a/win32/contrib/pthreads/cancel.c b/win32/contrib/pthreads/cancel.c deleted file mode 100644 index 6243257be..000000000 --- a/win32/contrib/pthreads/cancel.c +++ /dev/null @@ -1,388 +0,0 @@ -/*
- * cancel.c
- *
- * Description:
- * POSIX thread functions related to thread cancellation.
- *
- * Pthreads-win32 - POSIX Threads Library for Win32
- * Copyright (C) 1998
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Library 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
- * Library General Public License for more details.
- *
- * You should have received a copy of the GNU Library General Public
- * License along with this library; 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 PROGCTR(Context) ((Context).Eip)
-#endif
-
-#if defined(_MIPS_)
-#define PROGCTR(Context) ((Context).Fir)
-#endif
-
-#if defined(_ALPHA_)
-#define PROGCTR(Context) ((Context).Fir)
-#endif
-
-#if defined(_PPC_)
-#define PROGCTR(Context) ((Context).Iar)
-#endif
-
-#if !defined(PROGCTR)
-#error Module contains CPU-specific code; modify and recompile.
-#endif
-
-
-static void
-ptw32_cancel_self(void)
-{
- ptw32_throw(PTW32_EPS_CANCEL);
-
- /* Never reached */
-}
-
-
-/*
- * ptw32_cancel_thread implements asynchronous cancellation.
- */
-static INLINE void
-ptw32_cancel_thread(pthread_t thread)
-{
- HANDLE threadH = thread->threadH;
-
- (void) pthread_mutex_lock(&thread->cancelLock);
-
- SuspendThread(threadH);
-
- if (WaitForSingleObject(threadH, 0) == WAIT_TIMEOUT)
- {
- CONTEXT context;
- context.ContextFlags = CONTEXT_CONTROL;
- GetThreadContext(threadH, &context);
- PROGCTR(context) = (DWORD) ptw32_cancel_self;
- SetThreadContext(threadH, &context);
- ResumeThread(threadH);
- }
-
- (void) pthread_mutex_unlock(&thread->cancelLock);
-}
-
-
-int
-pthread_setcancelstate (int state, int *oldstate)
- /*
- * ------------------------------------------------------
- * DOCPUBLIC
- * This function atomically sets the calling thread's
- * cancelability state to 'state' and returns the previous
- * cancelability state at the location referenced by
- * 'oldstate'
- *
- * PARAMETERS
- * state,
- * oldstate
- * PTHREAD_CANCEL_ENABLE
- * cancellation is enabled,
- *
- * PTHREAD_CANCEL_DISABLE
- * cancellation is disabled
- *
- *
- * DESCRIPTION
- * This function atomically sets the calling thread's
- * cancelability state to 'state' and returns the previous
- * cancelability state at the location referenced by
- * 'oldstate'.
- *
- * NOTES:
- * 1) Use to disable cancellation around 'atomic' code that
- * includes cancellation points
- *
- * COMPATIBILITY ADDITIONS
- * If 'oldstate' is NULL then the previous state is not returned
- * but the function still succeeds. (Solaris)
- *
- * RESULTS
- * 0 successfully set cancelability type,
- * EINVAL 'state' is invalid
- *
- * ------------------------------------------------------
- */
-{
- int result = 0;
- pthread_t self = pthread_self();
-
- if (self == NULL
- || (state != PTHREAD_CANCEL_ENABLE
- && state != PTHREAD_CANCEL_DISABLE))
- {
- return EINVAL;
- }
-
- /*
- * Lock for async-cancel safety.
- */
- (void) pthread_mutex_lock(&self->cancelLock);
-
- if (oldstate != NULL)
- {
- *oldstate = self->cancelState;
- }
-
- self->cancelState = state;
-
- /*
- * Check if there is a pending asynchronous cancel
- */
- if (self->cancelState == PTHREAD_CANCEL_ENABLE
- && self->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS
- && WaitForSingleObject(self->cancelEvent, 0) == WAIT_OBJECT_0)
- {
- ResetEvent(self->cancelEvent);
- (void) pthread_mutex_unlock(&self->cancelLock);
- ptw32_throw(PTW32_EPS_CANCEL);
-
- /* Never reached */
- }
-
- (void) pthread_mutex_unlock(&self->cancelLock);
-
- return (result);
-
-} /* pthread_setcancelstate */
-
-
-int
-pthread_setcanceltype (int type, int *oldtype)
- /*
- * ------------------------------------------------------
- * DOCPUBLIC
- * This function atomically sets the calling thread's
- * cancelability type to 'type' and returns the previous
- * cancelability type at the location referenced by
- * 'oldtype'
- *
- * PARAMETERS
- * type,
- * oldtype
- * PTHREAD_CANCEL_DEFERRED
- * only deferred cancelation is allowed,
- *
- * PTHREAD_CANCEL_ASYNCHRONOUS
- * Asynchronous cancellation is allowed
- *
- *
- * DESCRIPTION
- * This function atomically sets the calling thread's
- * cancelability type to 'type' and returns the previous
- * cancelability type at the location referenced by
- * 'oldtype'
- *
- * NOTES:
- * 1) Use with caution; most code is not safe for use
- * with asynchronous cancelability.
- *
- * COMPATIBILITY ADDITIONS
- * If 'oldtype' is NULL then the previous type is not returned
- * but the function still succeeds. (Solaris)
- *
- * RESULTS
- * 0 successfully set cancelability type,
- * EINVAL 'type' is invalid
- *
- * ------------------------------------------------------
- */
-{
- int result = 0;
- pthread_t self = pthread_self();
-
- if (self == NULL
- || (type != PTHREAD_CANCEL_DEFERRED
- && type != PTHREAD_CANCEL_ASYNCHRONOUS))
- {
- return EINVAL;
- }
-
- /*
- * Lock for async-cancel safety.
- */
- (void) pthread_mutex_lock(&self->cancelLock);
-
- if (oldtype != NULL)
- {
- *oldtype = self->cancelType;
- }
-
- self->cancelType = type;
-
- /*
- * Check if there is a pending asynchronous cancel
- */
- if (self->cancelState == PTHREAD_CANCEL_ENABLE
- && self->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS
- && WaitForSingleObject(self->cancelEvent, 0) == WAIT_OBJECT_0)
- {
- ResetEvent(self->cancelEvent);
- (void) pthread_mutex_unlock(&self->cancelLock);
- ptw32_throw(PTW32_EPS_CANCEL);
-
- /* Never reached */
- }
-
- (void) pthread_mutex_unlock(&self->cancelLock);
-
- return (result);
-
-} /* pthread_setcanceltype */
-
-void
-pthread_testcancel (void)
- /*
- * ------------------------------------------------------
- * DOCPUBLIC
- * This function creates a deferred cancellation point
- * in the calling thread. The call has no effect if the
- * current cancelability state is
- * PTHREAD_CANCEL_DISABLE
- *
- * PARAMETERS
- * N/A
- *
- *
- * DESCRIPTION
- * This function creates a deferred cancellation point
- * in the calling thread. The call has no effect if the
- * current cancelability state is
- * PTHREAD_CANCEL_DISABLE
- *
- * NOTES:
- * 1) Cancellation is asynchronous. Use pthread_join
- * to wait for termination of thread if necessary
- *
- * RESULTS
- * N/A
- *
- * ------------------------------------------------------
- */
-{
- pthread_t self = pthread_self();
-
- if (self != NULL
- && self->cancelState == PTHREAD_CANCEL_ENABLE
- && WaitForSingleObject (self->cancelEvent, 0) == WAIT_OBJECT_0
- )
- {
- /*
- * Canceling!
- */
- ptw32_throw(PTW32_EPS_CANCEL);
- }
-} /* pthread_testcancel */
-
-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(&self->cancelLock);
-
- if (thread->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS
- && thread->cancelState == PTHREAD_CANCEL_ENABLE )
- {
- if (cancel_self)
- {
- (void) pthread_mutex_unlock(&self->cancelLock);
- ptw32_throw(PTW32_EPS_CANCEL);
-
- /* Never reached */
- }
-
- ptw32_cancel_thread(thread);
- }
- else
- {
- /*
- * Set for deferred cancellation.
- */
- if (!SetEvent (thread->cancelEvent))
- {
- result = ESRCH;
- }
- }
-
- (void) pthread_mutex_unlock(&self->cancelLock);
-
- return (result);
-
-}
-
-
-
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