source: libcfa/src/concurrency/exception.cfa @ 9d5eacb

//
// 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 : Wed Oct 28 14:34:00 2020
// Update Count     : 1
//

#define __cforall_thread__

#include "exception.hfa"

#include "coroutine.hfa"

extern struct thread$ * mainThread;
extern "C" {
extern void __cfactx_thrd_leave();
}

// 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;
    dst->cancellation = 1p;
        $ctx_switch( src, dst );
        abort();
)

extern "C" {

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

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

        struct thread$ * this_thread = active_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 );
}

}