source: src/libcfa/concurrency/thread.c @ a1edafa

//                              -*- Mode: CFA -*-
//
// 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.
//
// thread.c --
//
// Author           : Thierry Delisle
// Created On       : Tue Jan 17 12:27:26 2017
// Last Modified By : Thierry Delisle
// Last Modified On : --
// Update Count     : 0
//

#include "thread"

#include "kernel_private.h"
#include "libhdr.h"

#define __CFA_INVOKE_PRIVATE__
#include "invoke.h"

extern "C" {
        #include <fenv.h>
        #include <stddef.h>
}

extern volatile thread_local processor * this_processor;

//-----------------------------------------------------------------------------
// Thread ctors and dtors

void ?{}(thread_desc* this) {
        (&this->cor){};
        this->cor.name = "Anonymous Coroutine";
        this->mon.owner = this;
        this->mon.recursion = 1;
        this->next = NULL;

        this->current_monitors      = &this->mon;
        this->current_monitor_count = 1;
}

void ^?{}(thread_desc* this) {
        ^(&this->cor){};
}

forall( dtype T | sized(T) | is_thread(T) | { void ?{}(T*); } )
void ?{}( scoped(T)* this ) {
        (&this->handle){};
        __thrd_start(&this->handle);
}

forall( dtype T, ttype P | sized(T) | is_thread(T) | { void ?{}(T*, P); } )
void ?{}( scoped(T)* this, P params ) {
        (&this->handle){ params };
        __thrd_start(&this->handle);
}

forall( dtype T | sized(T) | is_thread(T) )
void ^?{}( scoped(T)* this ) {
        ^(&this->handle){};
}

//-----------------------------------------------------------------------------
// Starting and stopping threads
forall( dtype T | is_thread(T) )
void __thrd_start( T* this ) {
        coroutine_desc* thrd_c = get_coroutine(this);
        thread_desc*  thrd_h = get_thread   (this);
        thrd_c->last = this_coroutine;

        // LIB_DEBUG_PRINT_SAFE("Thread start : %p (t %p, c %p)\n", this, thrd_c, thrd_h);

        disable_interrupts();
        create_stack(&thrd_c->stack, thrd_c->stack.size);
        this_coroutine = thrd_c;
        CtxStart(this, CtxInvokeThread);
        assert( thrd_c->last->stack.context );
        CtxSwitch( thrd_c->last->stack.context, thrd_c->stack.context );

        ScheduleThread(thrd_h);
        enable_interrupts( DEBUG_CTX );
}

void yield( void ) {
        BlockInternal( this_thread );
}

void yield( unsigned times ) {
        for( unsigned i = 0; i < times; i++ ) {
                yield();
        }
}

void ThreadCtxSwitch(coroutine_desc* src, coroutine_desc* dst) {
        // set state of current coroutine to inactive
        src->state = src->state == Halted ? Halted : Inactive;
        dst->state = Active;

        //update the last resumer
        dst->last = src;

        // set new coroutine that the processor is executing
        // and context switch to it
        this_coroutine = dst;
        assert( src->stack.context );
        CtxSwitch( src->stack.context, dst->stack.context );
        this_coroutine = src;

        // set state of new coroutine to active
        dst->state = dst->state == Halted ? Halted : Inactive;
        src->state = Active;
}

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