/* Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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/* Copyright (C) 2005, 2006 Free Software Foundation, Inc.
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Contributed by Richard Henderson <rth@redhat.com>.
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Contributed by Richard Henderson <rth@redhat.com>.
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This file is part of the GNU OpenMP Library (libgomp).
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This file is part of the GNU OpenMP Library (libgomp).
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Libgomp is free software; you can redistribute it and/or modify it
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Libgomp is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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(at your option) any later version.
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for
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more details.
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more details.
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You should have received a copy of the GNU Lesser General Public License
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You should have received a copy of the GNU Lesser General Public License
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along with libgomp; see the file COPYING.LIB. If not, write to the
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along with libgomp; see the file COPYING.LIB. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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MA 02110-1301, USA. */
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/* As a special exception, if you link this library with other files, some
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/* As a special exception, if you link this library with other files, some
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of which are compiled with GCC, to produce an executable, this library
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of which are compiled with GCC, to produce an executable, this library
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does not by itself cause the resulting executable to be covered by the
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does not by itself cause the resulting executable to be covered by the
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GNU General Public License. This exception does not however invalidate
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GNU General Public License. This exception does not however invalidate
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any other reasons why the executable file might be covered by the GNU
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any other reasons why the executable file might be covered by the GNU
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General Public License. */
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General Public License. */
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/* This file defines the OpenMP internal control variables, and arranges
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/* This file defines the OpenMP internal control variables, and arranges
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for them to be initialized from environment variables at startup. */
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for them to be initialized from environment variables at startup. */
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#include "libgomp.h"
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#include "libgomp.h"
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#include "libgomp_f.h"
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#include "libgomp_f.h"
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#include <ctype.h>
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#include <ctype.h>
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#include <stdlib.h>
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#include <stdlib.h>
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#include <string.h>
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#include <string.h>
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#include <limits.h>
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#include <limits.h>
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#include <errno.h>
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#include <errno.h>
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unsigned long gomp_nthreads_var = 1;
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unsigned long gomp_nthreads_var = 1;
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bool gomp_dyn_var = false;
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bool gomp_dyn_var = false;
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bool gomp_nest_var = false;
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bool gomp_nest_var = false;
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enum gomp_schedule_type gomp_run_sched_var = GFS_DYNAMIC;
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enum gomp_schedule_type gomp_run_sched_var = GFS_DYNAMIC;
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unsigned long gomp_run_sched_chunk = 1;
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unsigned long gomp_run_sched_chunk = 1;
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/* Parse the OMP_SCHEDULE environment variable. */
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/* Parse the OMP_SCHEDULE environment variable. */
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static void
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static void
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parse_schedule (void)
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parse_schedule (void)
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{
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{
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char *env, *end;
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char *env, *end;
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unsigned long value;
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unsigned long value;
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env = getenv ("OMP_SCHEDULE");
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env = getenv ("OMP_SCHEDULE");
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if (env == NULL)
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if (env == NULL)
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return;
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return;
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while (isspace ((unsigned char) *env))
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while (isspace ((unsigned char) *env))
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++env;
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++env;
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if (strncasecmp (env, "static", 6) == 0)
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if (strncasecmp (env, "static", 6) == 0)
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{
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{
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gomp_run_sched_var = GFS_STATIC;
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gomp_run_sched_var = GFS_STATIC;
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env += 6;
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env += 6;
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}
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}
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else if (strncasecmp (env, "dynamic", 7) == 0)
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else if (strncasecmp (env, "dynamic", 7) == 0)
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{
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{
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gomp_run_sched_var = GFS_DYNAMIC;
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gomp_run_sched_var = GFS_DYNAMIC;
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env += 7;
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env += 7;
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}
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}
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else if (strncasecmp (env, "guided", 6) == 0)
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else if (strncasecmp (env, "guided", 6) == 0)
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{
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{
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gomp_run_sched_var = GFS_GUIDED;
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gomp_run_sched_var = GFS_GUIDED;
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env += 6;
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env += 6;
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}
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}
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else
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else
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goto unknown;
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goto unknown;
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while (isspace ((unsigned char) *env))
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while (isspace ((unsigned char) *env))
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++env;
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++env;
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if (*env == '\0')
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if (*env == '\0')
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return;
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return;
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if (*env++ != ',')
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if (*env++ != ',')
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goto unknown;
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goto unknown;
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while (isspace ((unsigned char) *env))
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while (isspace ((unsigned char) *env))
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++env;
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++env;
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if (*env == '\0')
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if (*env == '\0')
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goto invalid;
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goto invalid;
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errno = 0;
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errno = 0;
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value = strtoul (env, &end, 10);
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value = strtoul (env, &end, 10);
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if (errno)
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if (errno)
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goto invalid;
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goto invalid;
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while (isspace ((unsigned char) *end))
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while (isspace ((unsigned char) *end))
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++end;
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++end;
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if (*end != '\0')
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if (*end != '\0')
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goto invalid;
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goto invalid;
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gomp_run_sched_chunk = value;
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gomp_run_sched_chunk = value;
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return;
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return;
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unknown:
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unknown:
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gomp_error ("Unknown value for environment variable OMP_SCHEDULE");
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gomp_error ("Unknown value for environment variable OMP_SCHEDULE");
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return;
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return;
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invalid:
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invalid:
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gomp_error ("Invalid value for chunk size in "
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gomp_error ("Invalid value for chunk size in "
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"environment variable OMP_SCHEDULE");
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"environment variable OMP_SCHEDULE");
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return;
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return;
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}
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}
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/* Parse an unsigned long environment varible. Return true if one was
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/* Parse an unsigned long environment varible. Return true if one was
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present and it was successfully parsed. */
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present and it was successfully parsed. */
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static bool
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static bool
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parse_unsigned_long (const char *name, unsigned long *pvalue)
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parse_unsigned_long (const char *name, unsigned long *pvalue)
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{
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{
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char *env, *end;
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char *env, *end;
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unsigned long value;
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unsigned long value;
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env = getenv (name);
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env = getenv (name);
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if (env == NULL)
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if (env == NULL)
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return false;
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return false;
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while (isspace ((unsigned char) *env))
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while (isspace ((unsigned char) *env))
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++env;
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++env;
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if (*env == '\0')
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if (*env == '\0')
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goto invalid;
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goto invalid;
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errno = 0;
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errno = 0;
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value = strtoul (env, &end, 10);
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value = strtoul (env, &end, 10);
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if (errno || (long) value <= 0)
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if (errno || (long) value <= 0)
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goto invalid;
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goto invalid;
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while (isspace ((unsigned char) *end))
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while (isspace ((unsigned char) *end))
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++end;
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++end;
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if (*end != '\0')
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if (*end != '\0')
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goto invalid;
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goto invalid;
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*pvalue = value;
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*pvalue = value;
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return true;
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return true;
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invalid:
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invalid:
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gomp_error ("Invalid value for environment variable %s", name);
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gomp_error ("Invalid value for environment variable %s", name);
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return false;
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return false;
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}
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}
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/* Parse a boolean value for environment variable NAME and store the
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/* Parse a boolean value for environment variable NAME and store the
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result in VALUE. */
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result in VALUE. */
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static void
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static void
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parse_boolean (const char *name, bool *value)
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parse_boolean (const char *name, bool *value)
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{
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{
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const char *env;
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const char *env;
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env = getenv (name);
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env = getenv (name);
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if (env == NULL)
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if (env == NULL)
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return;
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return;
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while (isspace ((unsigned char) *env))
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while (isspace ((unsigned char) *env))
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++env;
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++env;
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if (strncasecmp (env, "true", 4) == 0)
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if (strncasecmp (env, "true", 4) == 0)
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{
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{
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*value = true;
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*value = true;
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env += 4;
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env += 4;
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}
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}
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else if (strncasecmp (env, "false", 5) == 0)
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else if (strncasecmp (env, "false", 5) == 0)
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{
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{
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*value = false;
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*value = false;
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env += 5;
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env += 5;
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}
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}
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else
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else
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env = "X";
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env = "X";
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while (isspace ((unsigned char) *env))
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while (isspace ((unsigned char) *env))
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++env;
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++env;
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if (*env != '\0')
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if (*env != '\0')
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gomp_error ("Invalid value for environment variable %s", name);
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gomp_error ("Invalid value for environment variable %s", name);
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}
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}
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static void __attribute__((constructor))
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static void __attribute__((constructor))
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initialize_env (void)
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initialize_env (void)
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{
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{
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unsigned long stacksize;
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unsigned long stacksize;
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/* Do a compile time check that mkomp_h.pl did good job. */
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/* Do a compile time check that mkomp_h.pl did good job. */
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omp_check_defines ();
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omp_check_defines ();
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parse_schedule ();
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parse_schedule ();
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parse_boolean ("OMP_DYNAMIC", &gomp_dyn_var);
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parse_boolean ("OMP_DYNAMIC", &gomp_dyn_var);
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parse_boolean ("OMP_NESTED", &gomp_nest_var);
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parse_boolean ("OMP_NESTED", &gomp_nest_var);
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if (!parse_unsigned_long ("OMP_NUM_THREADS", &gomp_nthreads_var))
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if (!parse_unsigned_long ("OMP_NUM_THREADS", &gomp_nthreads_var))
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gomp_init_num_threads ();
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gomp_init_num_threads ();
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/* Not strictly environment related, but ordering constructors is tricky. */
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/* Not strictly environment related, but ordering constructors is tricky. */
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pthread_attr_init (&gomp_thread_attr);
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pthread_attr_init (&gomp_thread_attr);
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pthread_attr_setdetachstate (&gomp_thread_attr, PTHREAD_CREATE_DETACHED);
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pthread_attr_setdetachstate (&gomp_thread_attr, PTHREAD_CREATE_DETACHED);
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if (parse_unsigned_long ("GOMP_STACKSIZE", &stacksize))
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if (parse_unsigned_long ("GOMP_STACKSIZE", &stacksize))
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{
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{
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int err;
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int err;
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stacksize *= 1024;
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stacksize *= 1024;
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err = pthread_attr_setstacksize (&gomp_thread_attr, stacksize);
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err = pthread_attr_setstacksize (&gomp_thread_attr, stacksize);
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#ifdef PTHREAD_STACK_MIN
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#ifdef PTHREAD_STACK_MIN
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if (err == EINVAL)
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if (err == EINVAL)
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{
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{
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if (stacksize < PTHREAD_STACK_MIN)
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if (stacksize < PTHREAD_STACK_MIN)
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gomp_error ("Stack size less than minimum of %luk",
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gomp_error ("Stack size less than minimum of %luk",
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PTHREAD_STACK_MIN / 1024ul
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PTHREAD_STACK_MIN / 1024ul
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+ (PTHREAD_STACK_MIN % 1024 != 0));
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+ (PTHREAD_STACK_MIN % 1024 != 0));
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else
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else
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gomp_error ("Stack size larger than system limit");
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gomp_error ("Stack size larger than system limit");
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}
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}
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else
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else
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#endif
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#endif
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if (err != 0)
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if (err != 0)
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gomp_error ("Stack size change failed: %s", strerror (err));
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gomp_error ("Stack size change failed: %s", strerror (err));
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}
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}
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}
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}
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/* The public OpenMP API routines that access these variables. */
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/* The public OpenMP API routines that access these variables. */
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void
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void
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omp_set_num_threads (int n)
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omp_set_num_threads (int n)
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{
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{
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gomp_nthreads_var = (n > 0 ? n : 1);
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gomp_nthreads_var = (n > 0 ? n : 1);
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}
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}
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void
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void
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omp_set_dynamic (int val)
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omp_set_dynamic (int val)
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{
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{
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gomp_dyn_var = val;
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gomp_dyn_var = val;
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}
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}
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int
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int
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omp_get_dynamic (void)
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omp_get_dynamic (void)
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{
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{
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return gomp_dyn_var;
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return gomp_dyn_var;
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}
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}
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void
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void
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omp_set_nested (int val)
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omp_set_nested (int val)
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{
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{
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gomp_nest_var = val;
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gomp_nest_var = val;
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}
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}
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int
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int
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omp_get_nested (void)
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omp_get_nested (void)
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{
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{
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return gomp_nest_var;
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return gomp_nest_var;
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}
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}
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ialias (omp_set_dynamic)
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ialias (omp_set_dynamic)
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ialias (omp_set_nested)
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ialias (omp_set_nested)
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ialias (omp_set_num_threads)
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ialias (omp_set_num_threads)
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ialias (omp_get_dynamic)
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ialias (omp_get_dynamic)
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ialias (omp_get_nested)
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ialias (omp_get_nested)
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