#ifndef __CIVL_CIVLPTHREAD__
#define __CIVL_CIVLPTHREAD__

#include <pthread.h>
#include <civl-pthread.cvh>
#include <civlc.cvh>
#include <seq.cvh>

/* pthread_t struct definition
  Description: The pthread_t is a struct containing a $proc variable as well as a thread attribute which defines
  its interactions with other threads. It encapsulates the $proc and allows attributes to apply to it.
  Fields: thr: the $proc variable that is the heart of the thread
  attr: see above
*/

struct _pthread_t{
  $proc thr;
  const pthread_attr_t attr;
  _Bool terminated;
  void** exitValue;
};

/* pthread_attr_t struct definition
  Description: This struct corresponds to the pthread_attr_t which is the attribute of a pthread_t. It's fields
  define the way the pthread_t is able to interact (join/detach), (memory capacity), (scope) etc.
  
  Fields:
  int detachstate: Defines a threads ability to join with two values: PTHREAD_CREATE_DETACHED and PTHREAD_CREATE_JOINABLE
  int inheritsched: The inheritance scheduling policy of the thread
  int contentionscope: Defines the contention scope of the thread
  int schedpolicy: Determines the scheduling policy of the thread
  
*/
struct _pthread_attr_t{
  int detachstate;
  int inheritsched;
  int contentionscope;
  int schedpolicy;
  //sched_param param;
};

struct _pthread_gpool_t{
  pthread_t threads[];
};

struct _pthread_pool_t{
  $pthread_gpool_t gpool; 
  $proc tid;
  pthread_t * thread;
};

$atomic_f $pthread_gpool_t $pthread_gpool_create($scope scope){
  $pthread_gpool_t gpool=($pthread_gpool_t)$malloc(scope, sizeof(struct _pthread_gpool_t));

  $seq_init(&gpool->threads, 0, NULL);
  return gpool;
}

$atomic_f void $pthread_gpool_destroy($pthread_gpool_t gpool){
  $free(gpool);
}

$atomic_f $pthread_pool_t $pthread_pool_create_main($scope scope, $pthread_gpool_t gpool){
  pthread_t thread;
  
  thread.thr = $self;
  thread.attr.detachstate = PTHREAD_CREATE_JOINABLE;
  thread.attr.inheritsched = 0;
  thread.attr.contentionscope = 0;
  thread.attr.schedpolicy = 0;
  thread.terminated = $false;
  thread.exitValue = NULL;
  $pthread_gpool_add(gpool, &thread);
  return $pthread_pool_create(scope, gpool);
}

$atomic_f $pthread_pool_t $pthread_pool_create($scope scope, $pthread_gpool_t gpool){
  $pthread_pool_t pool=($pthread_pool_t)$malloc(scope, sizeof(struct _pthread_pool_t));

  pool->gpool=gpool;
  pool->tid=$self;

  int nthreads=$seq_length(&gpool->threads);

  for(int i=0; i<nthreads; i++){
    pthread_t thread=gpool->threads[i];

    if(!thread.terminated && thread.thr==$self){
      pool->thread=&(gpool->threads[i]);
      break;
    }
  }
  return pool;
}

$atomic_f void $pthread_pool_destroy($pthread_pool_t pool){
  $free(pool);
}

$atomic_f void $pthread_pool_terminates($pthread_pool_t pool, void* value){
  $pthread_gpool_t gpool=pool->gpool;
  int nthreads=$seq_length(&gpool->threads);
  int i;

  for(i=0; i<nthreads; i++){
    pthread_t *thread=&(gpool->threads[i]);
    
    if(!thread->terminated && thread->thr==pool->tid){
      thread->terminated = $true;
      break;
    }
  }
  /*if(i<nthreads)
    $seq_remove(&gpool->threads, i, NULL, 1);*/
}

$atomic_f _Bool $pthread_pool_is_terminated($pthread_pool_t pool, $proc pid){
  if(pid==$proc_null)
    return $false;

  $pthread_gpool_t gpool=pool->gpool;
  int nthreads=$seq_length(&gpool->threads);
  int i;

  for(i=0; i<nthreads; i++){
    pthread_t thread=gpool->threads[i];
    
    if(!thread.terminated && thread.thr==pid){
      return thread.terminated;
    }
  }
  
  return $true;
}


$atomic_f void $pthread_exit(void *value_ptr, $pthread_pool_t pool){
  $pthread_pool_terminates(pool, value_ptr);
  $free(pool);
  $exit();
}

#endif