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

//
// 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 : Peter A. Buhr
// Last Modified On : Fri Jul 21 22:34:46 2017
// Update Count     : 1
//

#include "thread"

#include "kernel_private.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) with( this ) {
        self_cor{};
        self_cor.name = "Anonymous Coroutine";
        curr_cor = &self_cor;
        self_mon.owner = &this;
        self_mon.recursion = 1;
        self_mon_p = &self_mon;
        next = NULL;
        __cfaabi_dbg_debug_do(
                dbg_next = NULL;
                dbg_prev = NULL;
                __cfaabi_dbg_thread_register(&this);
        )

        monitors{ &self_mon_p, 1, (fptr_t)0 };
}

void ^?{}(thread_desc& this) with( this ) {
        ^self_cor{};
}

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

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

forall( dtype T | sized(T) | is_thread(T) )
void ^?{}( scoped(T)& this ) with( 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;

        // __cfaabi_dbg_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( __cfaabi_dbg_ctx );
}

extern "C" {
        void __finish_creation(void) {
                coroutine_desc* thrd_c = this_coroutine;
                ThreadCtxSwitch( thrd_c, thrd_c->last );
        }
}

void yield( void ) {
        verify( preemption_state.enabled );
        BlockInternal( this_thread );
        verify( preemption_state.enabled );
}

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;

        // 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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