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109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/* Set the default attributes to be used by pthread_create in the process.
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Copyright (C) 2013-2017 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <stdlib.h>
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#include <pthreadP.h>
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#include <assert.h>
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#include <string.h>
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int
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pthread_setattr_default_np (const pthread_attr_t *in)
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{
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const struct pthread_attr *real_in;
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struct pthread_attr attrs;
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int ret;
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assert (sizeof (*in) >= sizeof (struct pthread_attr));
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real_in = (struct pthread_attr *) in;
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/* Catch invalid values. */
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int policy = real_in->schedpolicy;
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ret = check_sched_policy_attr (policy);
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if (ret)
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return ret;
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const struct sched_param *param = &real_in->schedparam;
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if (param->sched_priority > 0)
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{
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ret = check_sched_priority_attr (param->sched_priority, policy);
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if (ret)
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return ret;
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}
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/* stacksize == 0 is fine. It means that we don't change the current
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value. */
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if (real_in->stacksize != 0)
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{
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ret = check_stacksize_attr (real_in->stacksize);
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if (ret)
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return ret;
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}
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/* Having a default stack address is wrong. */
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if (real_in->flags & ATTR_FLAG_STACKADDR)
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return EINVAL;
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attrs = *real_in;
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/* Now take the lock because we start writing into
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__default_pthread_attr. */
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lll_lock (__default_pthread_attr_lock, LLL_PRIVATE);
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/* Free the cpuset if the input is 0. Otherwise copy in the cpuset
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contents. */
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size_t cpusetsize = attrs.cpusetsize;
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if (cpusetsize == 0)
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{
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free (__default_pthread_attr.cpuset);
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__default_pthread_attr.cpuset = NULL;
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}
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else if (cpusetsize == __default_pthread_attr.cpusetsize)
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{
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attrs.cpuset = __default_pthread_attr.cpuset;
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memcpy (attrs.cpuset, real_in->cpuset, cpusetsize);
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}
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else
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{
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/* This may look wrong at first sight, but it isn't. We're freeing
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__default_pthread_attr.cpuset and allocating to attrs.cpuset because
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we'll copy over all of attr to __default_pthread_attr later. */
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cpu_set_t *newp = realloc (__default_pthread_attr.cpuset,
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cpusetsize);
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if (newp == NULL)
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{
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ret = ENOMEM;
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goto out;
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}
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attrs.cpuset = newp;
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memcpy (attrs.cpuset, real_in->cpuset, cpusetsize);
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}
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/* We don't want to accidentally set the default stacksize to zero. */
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if (attrs.stacksize == 0)
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attrs.stacksize = __default_pthread_attr.stacksize;
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__default_pthread_attr = attrs;
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out:
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lll_unlock (__default_pthread_attr_lock, LLL_PRIVATE);
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return ret;
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}
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