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authorrpj <rpj>2002-02-08 01:51:17 +0000
committerrpj <rpj>2002-02-08 01:51:17 +0000
commitb29903300adc22ed277bbaa356aca8ed0c245957 (patch)
tree02921a99a145dda1e78a315cc75016443839f2e0 /cancel_setcancelstate.c
parent14118935d2d6863a4746223d8e22c2e58ffebab5 (diff)
Copyright notice updates; module splitting; POSIX version
conditional compilation; refinements; bug fixes. See the ChangeLog.
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+/*
+ * cancel_setcancelstate.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"
+
+
+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 (state == PTHREAD_CANCEL_ENABLE
+ && self->cancelType == PTHREAD_CANCEL_ASYNCHRONOUS
+ && WaitForSingleObject(self->cancelEvent, 0) == WAIT_OBJECT_0)
+ {
+ self->state = PThreadStateCanceling;
+ self->cancelState = PTHREAD_CANCEL_DISABLE;
+ 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 */
+