f574c7e44c
This is not likely to make it into a release and is basically disabled but should still be useful for testing. Obtained from: GCC pre-4.3 (rev. 123494, 125542; LGPLv2.1+)
355 lines
7.9 KiB
C
355 lines
7.9 KiB
C
/* Copyright (C) 2005, 2006, 2007 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;
|
||
unsigned short *gomp_cpu_affinity;
|
||
size_t gomp_cpu_affinity_len;
|
||
|
||
/* 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);
|
||
}
|
||
|
||
/* Parse the GOMP_CPU_AFFINITY environment varible. Return true if one was
|
||
present and it was successfully parsed. */
|
||
|
||
static bool
|
||
parse_affinity (void)
|
||
{
|
||
char *env, *end;
|
||
unsigned long cpu_beg, cpu_end, cpu_stride;
|
||
unsigned short *cpus = NULL;
|
||
size_t allocated = 0, used = 0, needed;
|
||
|
||
env = getenv ("GOMP_CPU_AFFINITY");
|
||
if (env == NULL)
|
||
return false;
|
||
|
||
do
|
||
{
|
||
while (*env == ' ' || *env == '\t')
|
||
env++;
|
||
|
||
cpu_beg = strtoul (env, &end, 0);
|
||
cpu_end = cpu_beg;
|
||
cpu_stride = 1;
|
||
if (env == end || cpu_beg >= 65536)
|
||
goto invalid;
|
||
|
||
env = end;
|
||
if (*env == '-')
|
||
{
|
||
cpu_end = strtoul (++env, &end, 0);
|
||
if (env == end || cpu_end >= 65536 || cpu_end < cpu_beg)
|
||
goto invalid;
|
||
|
||
env = end;
|
||
if (*env == ':')
|
||
{
|
||
cpu_stride = strtoul (++env, &end, 0);
|
||
if (env == end || cpu_stride == 0 || cpu_stride >= 65536)
|
||
goto invalid;
|
||
|
||
env = end;
|
||
}
|
||
}
|
||
|
||
needed = (cpu_end - cpu_beg) / cpu_stride + 1;
|
||
if (used + needed >= allocated)
|
||
{
|
||
unsigned short *new_cpus;
|
||
|
||
if (allocated < 64)
|
||
allocated = 64;
|
||
if (allocated > needed)
|
||
allocated <<= 1;
|
||
else
|
||
allocated += 2 * needed;
|
||
new_cpus = realloc (cpus, allocated * sizeof (unsigned short));
|
||
if (new_cpus == NULL)
|
||
{
|
||
free (cpus);
|
||
gomp_error ("not enough memory to store GOMP_CPU_AFFINITY list");
|
||
return false;
|
||
}
|
||
|
||
cpus = new_cpus;
|
||
}
|
||
|
||
while (needed--)
|
||
{
|
||
cpus[used++] = cpu_beg;
|
||
cpu_beg += cpu_stride;
|
||
}
|
||
|
||
while (*env == ' ' || *env == '\t')
|
||
env++;
|
||
|
||
if (*env == ',')
|
||
env++;
|
||
else if (*env == '\0')
|
||
break;
|
||
}
|
||
while (1);
|
||
|
||
gomp_cpu_affinity = cpus;
|
||
gomp_cpu_affinity_len = used;
|
||
return true;
|
||
|
||
invalid:
|
||
gomp_error ("Invalid value for enviroment variable GOMP_CPU_AFFINITY");
|
||
return false;
|
||
}
|
||
|
||
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 ();
|
||
if (parse_affinity ())
|
||
gomp_init_affinity ();
|
||
|
||
/* 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)
|