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/* Copyright (C) 2005, 2006 Free Software Foundation, Inc.

   Contributed by Richard Henderson <rth@redhat.com>.

   This file is part of the GNU OpenMP Library (libgomp).

   Libgomp is free software; you can redistribute it and/or modify it

   under the terms of the GNU Lesser General Public License as published by

   the Free Software Foundation; either version 2.1 of the License, or

   (at your option) any later version.

   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY

   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

   FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public License for

   more details.

   You should have received a copy of the GNU Lesser General Public License

   along with libgomp; see the file COPYING.LIB.  If not, write to the

   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

   MA 02110-1301, USA.  */

/* As a special exception, if you link this library with other files, some

   of which are compiled with GCC, to produce an executable, this library

   does not by itself cause the resulting executable to be covered by the

   GNU General Public License.  This exception does not however invalidate

   any other reasons why the executable file might be covered by the GNU

   General Public License.  */

/* This file defines the OpenMP internal control variables, and arranges

   for them to be initialized from environment variables at startup.  */

#include "libgomp.h"

#include "libgomp_f.h"

#include <ctype.h>

#include <stdlib.h>

#include <string.h>

#include <limits.h>

#include <errno.h>

unsigned long gomp_nthreads_var = 1;

bool gomp_dyn_var = false;

bool gomp_nest_var = false;

enum gomp_schedule_type gomp_run_sched_var = GFS_DYNAMIC;

unsigned long gomp_run_sched_chunk = 1;

/* Parse the OMP_SCHEDULE environment variable.  */

static void

parse_schedule (void)

{

  char *env, *end;

  unsigned long value;

  env = getenv ("OMP_SCHEDULE");

  if (env == NULL)

    return;

  while (isspace ((unsigned char) *env))

    ++env;

  if (strncasecmp (env, "static", 6) == 0)

    {

      gomp_run_sched_var = GFS_STATIC;

      env += 6;

    }

  else if (strncasecmp (env, "dynamic", 7) == 0)

    {

      gomp_run_sched_var = GFS_DYNAMIC;

      env += 7;

    }

  else if (strncasecmp (env, "guided", 6) == 0)

    {

      gomp_run_sched_var = GFS_GUIDED;

      env += 6;

    }

  else

    goto unknown;

  while (isspace ((unsigned char) *env))

    ++env;

  if (*env == '\0')

    return;

  if (*env++ != ',')

    goto unknown;

  while (isspace ((unsigned char) *env))

    ++env;

  if (*env == '\0')

    goto invalid;

  errno = 0;

  value = strtoul (env, &end, 10);

  if (errno)

    goto invalid;

  while (isspace ((unsigned char) *end))

    ++end;

  if (*end != '\0')

    goto invalid;

  gomp_run_sched_chunk = value;

  return;

 unknown:

  gomp_error ("Unknown value for environment variable OMP_SCHEDULE");

  return;

 invalid:

  gomp_error ("Invalid value for chunk size in "

              "environment variable OMP_SCHEDULE");

  return;

}

/* Parse an unsigned long environment varible.  Return true if one was

   present and it was successfully parsed.  */

static bool

parse_unsigned_long (const char *name, unsigned long *pvalue)

{

  char *env, *end;

  unsigned long value;

  env = getenv (name);

  if (env == NULL)

    return false;

  while (isspace ((unsigned char) *env))

    ++env;

  if (*env == '\0')

    goto invalid;

  errno = 0;

  value = strtoul (env, &end, 10);

  if (errno || (long) value <= 0)

    goto invalid;

  while (isspace ((unsigned char) *end))

    ++end;

  if (*end != '\0')

    goto invalid;

  *pvalue = value;

  return true;

 invalid:

  gomp_error ("Invalid value for environment variable %s", name);

  return false;

}

/* Parse a boolean value for environment variable NAME and store the

   result in VALUE.  */

static void

parse_boolean (const char *name, bool *value)

{

  const char *env;

  env = getenv (name);

  if (env == NULL)

    return;

  while (isspace ((unsigned char) *env))

    ++env;

  if (strncasecmp (env, "true", 4) == 0)

    {

      *value = true;

      env += 4;

    }

  else if (strncasecmp (env, "false", 5) == 0)

    {

      *value = false;

      env += 5;

    }

  else

    env = "X";

  while (isspace ((unsigned char) *env))

    ++env;

  if (*env != '\0')

    gomp_error ("Invalid value for environment variable %s", name);

}

static void __attribute__((constructor))

initialize_env (void)

{

  unsigned long stacksize;

  /* Do a compile time check that mkomp_h.pl did good job.  */

  omp_check_defines ();

  parse_schedule ();

  parse_boolean ("OMP_DYNAMIC", &gomp_dyn_var);

  parse_boolean ("OMP_NESTED", &gomp_nest_var);

  if (!parse_unsigned_long ("OMP_NUM_THREADS", &gomp_nthreads_var))

    gomp_init_num_threads ();

  /* Not strictly environment related, but ordering constructors is tricky.  */

  pthread_attr_init (&gomp_thread_attr);

  pthread_attr_setdetachstate (&gomp_thread_attr, PTHREAD_CREATE_DETACHED);

  if (parse_unsigned_long ("GOMP_STACKSIZE", &stacksize))

    {

      int err;

      stacksize *= 1024;

      err = pthread_attr_setstacksize (&gomp_thread_attr, stacksize);

#ifdef PTHREAD_STACK_MIN

      if (err == EINVAL)

        {

          if (stacksize < PTHREAD_STACK_MIN)

            gomp_error ("Stack size less than minimum of %luk",

                        PTHREAD_STACK_MIN / 1024ul

                        + (PTHREAD_STACK_MIN % 1024 != 0));

          else

            gomp_error ("Stack size larger than system limit");

        }

      else

#endif

      if (err != 0)

        gomp_error ("Stack size change failed: %s", strerror (err));

    }

}

/* The public OpenMP API routines that access these variables.  */

void

omp_set_num_threads (int n)

{

  gomp_nthreads_var = (n > 0 ? n : 1);

}

void

omp_set_dynamic (int val)

{

  gomp_dyn_var = val;

}

int

omp_get_dynamic (void)

{

  return gomp_dyn_var;

}

void

omp_set_nested (int val)

{

  gomp_nest_var = val;

}

int

omp_get_nested (void)

{

  return gomp_nest_var;

}

ialias (omp_set_dynamic)

ialias (omp_set_nested)

ialias (omp_set_num_threads)

ialias (omp_get_dynamic)

ialias (omp_get_nested)