IDATA VMCALL hythread_set_thread_stop_callback(hythread_t thread,
tm_thread_event_callback_proc stop_callback)
{
IDATA status = hythread_set_safepoint_callback(thread, stop_callback);
while (thread->suspend_count > 0) {
apr_atomic_dec32((volatile apr_uint32_t *)
&thread->suspend_count);
apr_atomic_dec32((volatile apr_uint32_t *)
&thread->request);
}
// if there is no competition, it would be 1, but if someone else is
// suspending the same thread simultaneously, it could be greater than 1
// if safepoint callback isn't set it could be equal to 0.
//
// The following assertion may be false because at each time
// one of the conditions is true, and the other is false, but
// when checking the whole condition it may be failse in the result.
// assert(thread->request > 0 || thread->safepoint_callback == NULL);
// notify the thread that it may wake up now,
// so that it would eventually reach exception safepoint
// and execute callback
hysem_post(thread->resume_event);
if (thread->state &
(TM_THREAD_STATE_SLEEPING | TM_THREAD_STATE_WAITING_WITH_TIMEOUT
| TM_THREAD_STATE_WAITING | TM_THREAD_STATE_IN_MONITOR_WAIT
| TM_THREAD_STATE_WAITING_INDEFINITELY | TM_THREAD_STATE_PARKED))
{
// This is needed for correct stopping of a thread blocked on monitor_wait.
// The thread needs some flag to exit its waiting loop.
// We piggy-back on interrupted status. A correct exception from TLS
// will be thrown because the check of exception status on leaving
// JNI frame comes before checking return status in Object.wait().
// Interrupted status will be cleared by function returning TM_ERROR_INTERRUPT.
// (though, in case of parked thread, it will not be cleared)
hythread_interrupt(thread);
}
return status;
} // hythread_set_thread_stop_callback
/**
* Interrupt a <code>thread</code>.
*
* If the <code>thread</code>is currently blocked (i.e. waiting on a monitor_wait or sleeping)
* resume the <code>thread</code>and cause it to return from the blocking function with
* TM_THREAD_INTERRUPTED.
*
* @param[in] java_thread a thread to be interrupted
* @sa java.lang.Thread.interrupt()
*/
IDATA VMCALL jthread_interrupt(jthread java_thread)
{
hythread_t tm_native_thread = jthread_get_native_thread(java_thread);
hythread_interrupt(tm_native_thread);
return TM_ERROR_NONE;
} // jthread_interrupt
