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/* $OpenBSD: uthread_cancel.c,v 1.5 2001/08/30 17:47:57 todd Exp $ */
/*
* David Leonard <d@openbsd.org>, 1999. Public domain.
*/
#include <sys/errno.h>
#include <pthread.h>
#include "pthread_private.h"
int
pthread_cancel(pthread)
pthread_t pthread;
{
int ret;
if ((ret = _find_thread(pthread))) {
} else if ((pthread->flags & PTHREAD_FLAGS_CANCELED) == 0) {
/* Set the thread's I've-been-cancelled flag: */
pthread->flags |= PTHREAD_FLAGS_CANCELED;
/* Check if we need to kick it back into the run queue: */
if ((pthread->cancelstate == PTHREAD_CANCEL_ENABLE) &&
((pthread->canceltype == PTHREAD_CANCEL_ASYNCHRONOUS) ||
(pthread->flags & PTHREAD_FLAGS_CANCELPT)))
switch (pthread->state) {
case PS_WAIT_WAIT:
case PS_FDR_WAIT:
case PS_FDW_WAIT:
case PS_SLEEP_WAIT:
case PS_SELECT_WAIT:
case PS_POLL_WAIT:
case PS_SIGSUSPEND:
/* Interrupt and resume: */
pthread->interrupted = 1;
if (pthread->flags & PTHREAD_FLAGS_IN_WORKQ)
PTHREAD_WORKQ_REMOVE(pthread);
PTHREAD_NEW_STATE(pthread,PS_RUNNING);
break;
case PS_MUTEX_WAIT:
case PS_COND_WAIT:
case PS_SIGWAIT:
case PS_FDLR_WAIT:
case PS_FDLW_WAIT:
case PS_FILE_WAIT:
case PS_JOIN:
case PS_SUSPENDED:
case PS_SIGTHREAD:
/* Simply wake: */
/* XXX may be incorrect */
PTHREAD_NEW_STATE(pthread,PS_RUNNING);
break;
case PS_RUNNING:
case PS_DEADLOCK:
case PS_SPINBLOCK:
case PS_DEAD:
/* Ignore */
break;
}
ret = 0;
}
return (ret);
}
int
pthread_setcancelstate(state, oldstate)
int state;
int *oldstate;
{
struct pthread *curthread = _get_curthread();
int ostate;
int ret;
ostate = curthread->cancelstate;
switch (state) {
case PTHREAD_CANCEL_ENABLE:
if (oldstate)
*oldstate = ostate;
curthread->cancelstate = PTHREAD_CANCEL_ENABLE;
if (curthread->canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
_thread_cancellation_point();
ret = 0;
break;
case PTHREAD_CANCEL_DISABLE:
if (oldstate)
*oldstate = ostate;
curthread->cancelstate = PTHREAD_CANCEL_DISABLE;
ret = 0;
break;
default:
ret = EINVAL;
}
return (ret);
}
int
pthread_setcanceltype(type, oldtype)
int type;
int *oldtype;
{
struct pthread *curthread = _get_curthread();
int otype;
int ret;
otype = curthread->canceltype;
switch (type) {
case PTHREAD_CANCEL_ASYNCHRONOUS:
if (oldtype)
*oldtype = otype;
curthread->canceltype = PTHREAD_CANCEL_ASYNCHRONOUS;
_thread_cancellation_point();
ret = 0;
break;
case PTHREAD_CANCEL_DEFERRED:
if (oldtype)
*oldtype = otype;
curthread->canceltype = PTHREAD_CANCEL_DEFERRED;
ret = 0;
break;
default:
ret = EINVAL;
}
return (ret);
}
void
pthread_testcancel()
{
_thread_cancellation_point();
}
void
_thread_enter_cancellation_point()
{
struct pthread *curthread = _get_curthread();
/* Look for a cancellation before we block: */
_thread_cancellation_point();
curthread->flags |= PTHREAD_FLAGS_CANCELPT;
}
void
_thread_leave_cancellation_point()
{
struct pthread *curthread = _get_curthread();
curthread->flags &=~ PTHREAD_FLAGS_CANCELPT;
/* Look for a cancellation after we unblock: */
_thread_cancellation_point();
}
/*
* Must only be called when in asynchronous cancel mode, or
* from pthread_testcancel().
*/
void
_thread_cancellation_point()
{
struct pthread *curthread = _get_curthread();
if ((curthread->cancelstate == PTHREAD_CANCEL_ENABLE) &&
((curthread->flags & (PTHREAD_FLAGS_CANCELED|PTHREAD_EXITING)) ==
PTHREAD_FLAGS_CANCELED)) {
curthread->flags &=~ PTHREAD_FLAGS_CANCELED;
pthread_exit(PTHREAD_CANCELED);
PANIC("cancel");
}
}
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