source: libcfa/src/concurrency/exception.cfa @ ab8c6a6

//
// Cforall Version 1.0.0 Copyright (C) 2016 University of Waterloo
//
// The contents of this file are covered under the licence agreement in the
// file "LICENCE" distributed with Cforall.
//
// exception.cfa -- Exceptions in a concurrent environment.
//
// Author           : Andrew Beach
// Created On       : Mon Aug 17 10:41:00 2020
// Last Modified By : Andrew Beach
// Last Modified On : Tue Aug 25 14:41:00 2020
// Update Count     : 0
//

extern "C" {
// use this define to make unwind.h play nice, definitely a hack
#define HIDE_EXPORTS
#include <unwind.h>
#undef HIDE_EXPORTS

extern void __cfactx_thrd_leave();
}

#include "invoke.h"
#include "exception.hfa"
#include "coroutine.hfa"

extern struct $thread * mainThread;

// Common pattern for all the stop functions, wait until the end then act.
#define STOP_AT_END_FUNCTION(NAME, ...) \
static _Unwind_Reason_Code NAME( \
                int version, \
                _Unwind_Action actions, \
                _Unwind_Exception_Class exception_class, \
                struct _Unwind_Exception * unwind_exception, \
                struct _Unwind_Context * unwind_context, \
                void * stop_param) { \
        verify(actions & _UA_CLEANUP_PHASE); \
        verify(actions & _UA_FORCE_UNWIND); \
        verify(!(actions & _UA_SEARCH_PHASE)); \
        verify(!(actions & _UA_HANDLER_FRAME)); \
        if ( actions & _UA_END_OF_STACK ) { \
                __VA_ARGS__ \
        } else { \
                return _URC_NO_REASON; \
        } \
}

STOP_AT_END_FUNCTION(main_cancelstop,
        abort();
)

STOP_AT_END_FUNCTION(thread_cancelstop,
    __cfactx_thrd_leave();
    __cabi_abort( "Resumed cancelled thread" );
)

STOP_AT_END_FUNCTION(coroutine_cancelstop,
        struct $coroutine * src = ($coroutine *)stop_param;
        struct $coroutine * dst = src->last;

        $ctx_switch( src, dst );
        abort();
)

extern "C" {

struct exception_context_t * this_exception_context(void) {
        return &__get_stack( active_coroutine() )->exception_context;
}

_Unwind_Reason_Code __cfaehm_cancellation_unwind( struct _Unwind_Exception * unwind_exception ) {
        _Unwind_Stop_Fn stop_func;
        void * stop_param;

        struct $thread * this_thread = TL_GET( this_thread );
        if ( &this_thread->self_cor != this_thread->curr_cor ) {
                struct $coroutine * cor = this_thread->curr_cor;
                cor->cancellation = unwind_exception;

                stop_func = coroutine_cancelstop;
                stop_param = cor;
        } else if ( mainThread == this_thread ) {
                stop_func = main_cancelstop;
                stop_param = (void *)0x22;
        } else {
                this_thread->self_cor.cancellation = unwind_exception;

                stop_func = thread_cancelstop;
                stop_param = this_thread;
        }

        return _Unwind_ForcedUnwind( unwind_exception, stop_func, stop_param );
}

}