source: rtems/cpukit/posix/src/pthreadinitthreads.c @ 1d572eba

/**
 * @file
 *
 * @brief POSIX Threads Initialize User Threads Body
 * @ingroup POSIX_PTHREAD
 */

/*
 *  COPYRIGHT (c) 1989-2008.
 *  On-Line Applications Research Corporation (OAR).
 *
 *  The license and distribution terms for this file may be
 *  found in the file LICENSE in this distribution or at
 *  http://www.rtems.org/license/LICENSE.
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif

#include <errno.h>
#include <pthread.h>
#include <limits.h>

#include <rtems/system.h>
#include <rtems/config.h>
#include <rtems/score/stack.h>
#include <rtems/score/thread.h>
#include <rtems/score/wkspace.h>
#include <rtems/posix/posixapi.h>
#include <rtems/posix/pthreadimpl.h>
#include <rtems/posix/priorityimpl.h>
#include <rtems/posix/config.h>
#include <rtems/rtems/config.h>

static void *_POSIX_Global_construction( void *arg )
{
  Thread_Control           *executing = _Thread_Get_executing();
  Thread_Entry_information  entry = executing->Start.Entry;

  entry.Kinds.Pointer.entry = Configuration_POSIX_API
    .User_initialization_threads_table[ 0 ].thread_entry;

  (void) arg;
  _Thread_Global_construction( executing, &entry );
}

void _POSIX_Threads_Initialize_user_threads_body(void)
{
  int                                 eno;
  uint32_t                            index;
  uint32_t                            maximum;
  posix_initialization_threads_table *user_threads;
  pthread_t                           thread_id;
  pthread_attr_t                      attr;
  bool                                register_global_construction;
  void                             *(*thread_entry)(void *);

  user_threads = Configuration_POSIX_API.User_initialization_threads_table;
  maximum      = Configuration_POSIX_API.number_of_initialization_threads;

  if ( !user_threads )
    return;

  register_global_construction =
    Configuration_RTEMS_API.number_of_initialization_tasks == 0;

  /*
   *  Be careful .. if the default attribute set changes, this may need to.
   *
   *  Setting the attributes explicitly is critical, since we don't want
   *  to inherit the idle tasks attributes.
   */

  for ( index=0 ; index < maximum ; index++ ) {
    /*
     * There is no way for these calls to fail in this situation.
     */
    eno = pthread_attr_init( &attr );
    _Assert( eno == 0 );
    eno = pthread_attr_setinheritsched( &attr, PTHREAD_EXPLICIT_SCHED );
    _Assert( eno == 0 );
    eno = pthread_attr_setstacksize(&attr, user_threads[ index ].stack_size);
    _Assert( eno == 0 );

    thread_entry = user_threads[ index ].thread_entry;
    if ( thread_entry == NULL ) {
      _Internal_error( INTERNAL_ERROR_POSIX_INIT_THREAD_ENTRY_IS_NULL );
    }

    if ( register_global_construction ) {
      register_global_construction = false;
      thread_entry = _POSIX_Global_construction;
    }

    eno = pthread_create(
      &thread_id,
      &attr,
      thread_entry,
      NULL
    );
    if ( eno != 0 ) {
      _Internal_error( INTERNAL_ERROR_POSIX_INIT_THREAD_CREATE_FAILED );
    }
  }
}