source: src/libcfa/concurrency/kernel @ 14a61b5

//
// 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.
//
// kernel --
//
// Author           : Thierry Delisle
// Created On       : Tue Jan 17 12:27:26 2017
// Last Modified By : Peter A. Buhr
// Last Modified On : Tue Apr 10 14:46:49 2018
// Update Count     : 10
//

#pragma once

#include <stdbool.h>

#include "invoke.h"
#include "time_t.h"

extern "C" {
#include <pthread.h>
}

//-----------------------------------------------------------------------------
// Locks
struct semaphore {
        __spinlock_t lock;
        int count;
        __queue_t(thread_desc) waiting;
};

void  ?{}(semaphore & this, int count = 1);
void ^?{}(semaphore & this);
void   P (semaphore & this);
void   V (semaphore & this);


//-----------------------------------------------------------------------------
// Cluster
struct cluster {
        // Ready queue locks
        __spinlock_t ready_queue_lock;

        // Ready queue for threads
        __queue_t(thread_desc) ready_queue;

        // Name of the cluster
        const char * name;

        // Preemption rate on this cluster
        Duration preemption_rate;

        // List of idle processors
        // __dllist_t(struct processor) idles;
};

extern struct cluster * mainCluster;
extern Duration default_preemption();

void ?{} (cluster & this, const char * name, Duration preemption_rate);
void ^?{}(cluster & this);

static inline void ?{} (cluster & this)                           { this{"Anonymous Cluster", default_preemption()}; }
static inline void ?{} (cluster & this, Duration preemption_rate) { this{"Anonymous Cluster", preemption_rate}; }
static inline void ?{} (cluster & this, const char * name)        { this{name, default_preemption()}; }

//-----------------------------------------------------------------------------
// Processor
enum FinishOpCode { No_Action, Release, Schedule, Release_Schedule, Release_Multi, Release_Multi_Schedule };

//TODO use union, many of these fields are mutually exclusive (i.e. MULTI vs NOMULTI)
struct FinishAction {
        FinishOpCode action_code;
        thread_desc * thrd;
        __spinlock_t * lock;
        __spinlock_t ** locks;
        unsigned short lock_count;
        thread_desc ** thrds;
        unsigned short thrd_count;
};
static inline void ?{}(FinishAction & this) {
        this.action_code = No_Action;
        this.thrd = NULL;
        this.lock = NULL;
}
static inline void ^?{}(FinishAction & this) {}

// Processor
coroutine processorCtx_t {
        struct processor * proc;
};

// Wrapper around kernel threads
struct processor {
        // Main state
        // Coroutine ctx who does keeps the state of the processor
        struct processorCtx_t runner;

        // Cluster from which to get threads
        cluster * cltr;

        // Name of the processor
        const char * name;

        // Handle to pthreads
        pthread_t kernel_thread;

        // Termination
        // Set to true to notify the processor should terminate
        volatile bool do_terminate;

        // Termination synchronisation
        semaphore terminated;

        // RunThread data
        // Action to do after a thread is ran
        struct FinishAction finish;

        // Preemption data
        // Node which is added in the discrete event simulaiton
        struct alarm_node_t * preemption_alarm;

        // If true, a preemption was triggered in an unsafe region, the processor must preempt as soon as possible
        bool pending_preemption;

        struct {
                pthread_mutex_t lock;
                pthread_cond_t  cond;
        } idle;

#ifdef __CFA_DEBUG__
        // Last function to enable preemption on this processor
        const char * last_enable;
#endif
};

void  ?{}(processor & this, const char * name, cluster & cltr);
void ^?{}(processor & this);

static inline void  ?{}(processor & this)                    { this{ "Anonymous Processor", *mainCluster}; }
static inline void  ?{}(processor & this, cluster & cltr)    { this{ "Anonymous Processor", cltr}; }
static inline void  ?{}(processor & this, const char * name) { this{name, *mainCluster }; }

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