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glibc/nptl/pthread_setattr_default_np.c
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/* Set the default attributes to be used by pthread_create in the process. | |
Copyright (C) 2013-2016 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 <stdlib.h> | |
#include <pthreadP.h> | |
#include <assert.h> | |
#include <string.h> | |
int | |
pthread_setattr_default_np (const pthread_attr_t *in) | |
{ | |
const struct pthread_attr *real_in; | |
struct pthread_attr attrs; | |
int ret; | |
assert (sizeof (*in) >= sizeof (struct pthread_attr)); | |
real_in = (struct pthread_attr *) in; | |
/* Catch invalid values. */ | |
int policy = real_in->schedpolicy; | |
ret = check_sched_policy_attr (policy); | |
if (ret) | |
return ret; | |
const struct sched_param *param = &real_in->schedparam; | |
if (param->sched_priority > 0) | |
{ | |
ret = check_sched_priority_attr (param->sched_priority, policy); | |
if (ret) | |
return ret; | |
} | |
/* stacksize == 0 is fine. It means that we don't change the current | |
value. */ | |
if (real_in->stacksize != 0) | |
{ | |
ret = check_stacksize_attr (real_in->stacksize); | |
if (ret) | |
return ret; | |
} | |
/* Having a default stack address is wrong. */ | |
if (real_in->flags & ATTR_FLAG_STACKADDR) | |
return EINVAL; | |
attrs = *real_in; | |
/* Now take the lock because we start writing into | |
__default_pthread_attr. */ | |
lll_lock (__default_pthread_attr_lock, LLL_PRIVATE); | |
/* Free the cpuset if the input is 0. Otherwise copy in the cpuset | |
contents. */ | |
size_t cpusetsize = attrs.cpusetsize; | |
if (cpusetsize == 0) | |
{ | |
free (__default_pthread_attr.cpuset); | |
__default_pthread_attr.cpuset = NULL; | |
} | |
else if (cpusetsize == __default_pthread_attr.cpusetsize) | |
{ | |
attrs.cpuset = __default_pthread_attr.cpuset; | |
memcpy (attrs.cpuset, real_in->cpuset, cpusetsize); | |
} | |
else | |
{ | |
/* This may look wrong at first sight, but it isn't. We're freeing | |
__default_pthread_attr.cpuset and allocating to attrs.cpuset because | |
we'll copy over all of attr to __default_pthread_attr later. */ | |
cpu_set_t *newp = realloc (__default_pthread_attr.cpuset, | |
cpusetsize); | |
if (newp == NULL) | |
{ | |
ret = ENOMEM; | |
goto out; | |
} | |
attrs.cpuset = newp; | |
memcpy (attrs.cpuset, real_in->cpuset, cpusetsize); | |
} | |
/* We don't want to accidentally set the default stacksize to zero. */ | |
if (attrs.stacksize == 0) | |
attrs.stacksize = __default_pthread_attr.stacksize; | |
__default_pthread_attr = attrs; | |
out: | |
lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE); | |
return ret; | |
} |