source: libcfa/src/concurrency/thread.cfa @ f1ec88a

//
// 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 Mar 30 17:19:52 2018
// Update Count     : 8
//

#include "thread.hfa"

#include "kernel_private.hfa"

#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, const char * const name, cluster & cl, void * storage, size_t storageSize ) with( this ) {
        context{ NULL, NULL };
        self_cor{ name, storage, storageSize };
        state = Start;
        curr_cor = &self_cor;
        self_mon.owner = &this;
        self_mon.recursion = 1;
        self_mon_p = &self_mon;
        curr_cluster = &cl;
        next = NULL;

        node.next = NULL;
        node.prev = NULL;
        doregister(curr_cluster, this);

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

void ^?{}(thread_desc& this) with( this ) {
        unregister(curr_cluster, 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 ) {
        thread_desc * this_thrd = get_thread(this);
        thread_desc * curr_thrd = TL_GET( this_thread );

        disable_interrupts();
        CtxStart(&this, CtxInvokeThread);
        this_thrd->context.[SP, FP] = this_thrd->self_cor.context.[SP, FP];
        verify( this_thrd->context.SP );
        CtxSwitch( &curr_thrd->context, &this_thrd->context );

        ScheduleThread(this_thrd);
        enable_interrupts( __cfaabi_dbg_ctx );
}

extern "C" {
        // KERNEL ONLY
        void __finish_creation(thread_desc * this) {
                // set new coroutine that the processor is executing
                // and context switch to it
                verify( kernelTLS.this_thread != this );
                verify( kernelTLS.this_thread->context.SP );
                CtxSwitch( &this->context, &kernelTLS.this_thread->context );
        }
}

void yield( void ) {
        // Safety note : This could cause some false positives due to preemption
      verify( TL_GET( preemption_state.enabled ) );
        BlockInternal( TL_GET( this_thread ) );
        // Safety note : This could cause some false positives due to preemption
      verify( TL_GET( preemption_state.enabled ) );
}

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

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