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/* Copyright (C) 2014-2015 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library 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.
The GNU C Library 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 the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <pthread.h>
#include <sys/prctl.h>
#if __mips_fpr != 0 || _MIPS_SPFPSET != 16
# error This test requires -mfpxx -mno-odd-spreg
#endif
/* This test verifies that all threads in a process see a mode
change when any thread causes a mode change. */
static int mode[6] =
{
0,
PR_FP_MODE_FR,
PR_FP_MODE_FR | PR_FP_MODE_FRE,
PR_FP_MODE_FR,
0,
PR_FP_MODE_FR | PR_FP_MODE_FRE
};
static volatile int current_mode;
static volatile int finished;
static pthread_barrier_t barr_ready;
static pthread_barrier_t barr_cont;
static void *
thread_function (void * arg __attribute__ ((unused)))
{
while (!finished)
{
int res = pthread_barrier_wait (&barr_ready);
if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
{
printf ("barrier wait failed: %m\n");
exit (1);
}
int mode = prctl (PR_GET_FP_MODE);
if (mode != current_mode)
{
printf ("unexpected mode: %d != %d\n", mode, current_mode);
exit (1);
}
res = pthread_barrier_wait (&barr_cont);
if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
{
printf ("barrier wait failed: %m\n");
exit (1);
}
}
return NULL;
}
int
main (void)
{
int count = sysconf (_SC_NPROCESSORS_ONLN);
if (count <= 0)
count = 1;
count *= 4;
pthread_t th[count];
int i;
int result = 0;
if (pthread_barrier_init (&barr_ready, NULL, count + 1) != 0)
{
printf ("failed to initialize barrier: %m\n");
exit (1);
}
if (pthread_barrier_init (&barr_cont, NULL, count + 1) != 0)
{
printf ("failed to initialize barrier: %m\n");
exit (1);
}
for (i = 0; i < count; ++i)
if (pthread_create (&th[i], NULL, thread_function, 0) != 0)
{
printf ("creation of thread %d failed\n", i);
exit (1);
}
for (i = 0 ; i < 7 ; i++)
{
if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0)
{
if (errno != ENOTSUP)
{
printf ("prctl PR_SET_FP_MODE failed: %m");
exit (1);
}
}
else
current_mode = mode[i % 6];
int res = pthread_barrier_wait (&barr_ready);
if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
{
printf ("barrier wait failed: %m\n");
exit (1);
}
if (i == 6)
finished = 1;
res = pthread_barrier_wait (&barr_cont);
if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
{
printf ("barrier wait failed: %m\n");
exit (1);
}
}
for (i = 0; i < count; ++i)
{
void *v;
if (pthread_join (th[i], &v) != 0)
{
printf ("join of thread %d failed\n", i);
result = 1;
}
else if (v != NULL)
{
printf ("join %d successful, but child failed\n", i);
result = 1;
}
else
printf ("join %d successful\n", i);
}
return result;
}
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