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/*
* 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"
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
* type,
* oldtype
* 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
*
* ------------------------------------------------------
*/
{
pthread_t self;
int result;
if (((self = pthread_self ()) != NULL) &&
(state == PTHREAD_CANCEL_ENABLE ||
state == PTHREAD_CANCEL_DISABLE))
{
if (oldstate != NULL)
{
*oldstate = self->cancelState;
}
self->cancelState = state;
result = 0;
}
else
{
result = EINVAL;
}
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
*
* ------------------------------------------------------
*/
{
pthread_t self;
int result;
if (((self = pthread_self ()) != NULL) &&
(type == PTHREAD_CANCEL_DEFERRED ||
type == PTHREAD_CANCEL_ASYNCHRONOUS))
{
if (oldtype != NULL)
{
*oldtype = self->cancelType;
}
self->cancelType = type;
result = 0;
}
else
{
result = EINVAL;
}
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;
if ((self = (pthread_t) pthread_getspecific (_pthread_selfThreadKey))
!= NULL)
{
if (self->cancelState == PTHREAD_CANCEL_ENABLE)
{
if (WaitForSingleObject (self->cancelEvent, 0) ==
WAIT_OBJECT_0)
{
/*
* Canceling!
*/
#ifdef _MSC_VER
DWORD exceptionInformation[3];
exceptionInformation[0] = (DWORD) (_PTHREAD_EPS_CANCEL);
exceptionInformation[1] = (DWORD) (0);
exceptionInformation[2] = (DWORD) (0);
RaiseException (
EXCEPTION_PTHREAD_SERVICES,
0,
3,
exceptionInformation);
#else /* _MSC_VER */
#ifdef __cplusplus
throw Pthread_exception_cancel();
#endif /* __cplusplus */
#endif /* _MSC_VER */
}
}
}
} /* 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',
*
* ------------------------------------------------------
*/
{
int result;
if (thread != NULL)
{
/*
* Set for deferred cancellation.
*/
if (!SetEvent (thread->cancelEvent))
{
result = ESRCH;
}
else
{
result = 0;
}
}
else
{
result = ESRCH;
}
return (result);
}
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