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support: Add support_set_small_thread_stack_size

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And support_small_stack_thread_attribute

Change-Id: I1cf79a469984f8f30a4a947ee9ec2a5e74de8926
This commit is contained in:
Florian Weimer 2019-11-11 09:20:09 +01:00
parent fc141ea78e
commit 36ada9ee2c
4 changed files with 94 additions and 0 deletions
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2
support/Makefile
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@ -63,7 +63,9 @@ libsupport-routines = \
support_quote_string \
support_record_failure \
support_run_diff \
support_set_small_thread_stack_size \
support_shared_allocate \
support_small_stack_thread_attribute \
support_subprocess \
support_test_compare_blob \
support_test_compare_failure \

30
support/support_set_small_thread_stack_size.c Normal file
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@ -0,0 +1,30 @@
/* Set a small stack size, but still large enough for glibc's needs.
Copyright (C) 2019 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
<https://www.gnu.org/licenses/>. */
#include <pthread.h>
#include <support/xthread.h>
#include <sys/param.h>
void
support_set_small_thread_stack_size (pthread_attr_t *attr)
{
/* Some architectures have too small values for PTHREAD_STACK_MIN
which cannot be used for creating threads. Ensure that the stack
size is at least 256 KiB. */
xpthread_attr_setstacksize (attr, MAX (256 * 1024, PTHREAD_STACK_MIN));
}

54
support/support_small_stack_thread_attribute.c Normal file
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@ -0,0 +1,54 @@
/* A thread attribute with a small stack.
Copyright (C) 2019 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
<https://www.gnu.org/licenses/>. */
#include <support/xthread.h>
#include <allocate_once.h>
static void *
allocate (void *closure)
{
pthread_attr_t *result = malloc (sizeof (*result));
xpthread_attr_init (result);
support_set_small_thread_stack_size (result);
return result;
}
static void
deallocate (void *ptr, void *closure)
{
xpthread_attr_destroy (ptr);
free (ptr);
}
static void *small_stack_attr;
pthread_attr_t *
support_small_stack_thread_attribute (void)
{
return allocate_once (&small_stack_attr, allocate, deallocate, NULL);
}
static void __attribute__ ((destructor))
fini (void)
{
if (small_stack_attr != NULL)
{
deallocate (small_stack_attr, NULL);
small_stack_attr = NULL;
}
}

8
support/xthread.h
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@ -75,6 +75,14 @@ void xpthread_attr_setstacksize (pthread_attr_t *attr,
void xpthread_attr_setguardsize (pthread_attr_t *attr,
size_t guardsize);
/* Set the stack size in ATTR to a small value, but still large enough
to cover most internal glibc stack usage. */
void support_set_small_thread_stack_size (pthread_attr_t *attr);
/* Return a pointer to a thread attribute which requests a small
stack. The caller must not free this pointer. */
pthread_attr_t *support_small_stack_thread_attribute (void);
/* This function returns non-zero if pthread_barrier_wait returned
PTHREAD_BARRIER_SERIAL_THREAD. */
int xpthread_barrier_wait (pthread_barrier_t *barrier);