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add limited pthread_setattr_default_np API to set stack size defaults

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based on patch by Timo Teräs:

While generally this is a bad API, it is the only existing API to
affect c++ (std::thread) and c11 (thrd_create) thread stack size.
This patch allows applications only to increate stack and guard
page sizes.
This commit is contained in:
Rich Felker
2016-11-08 12:09:05 -05:00
parent ea7891a651
commit 31fb174dd2
3 changed files with 45 additions and 4 deletions
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35
src/thread/pthread_setattr_default_np.c Normal file
View File

@ -0,0 +1,35 @@
#include "pthread_impl.h"
#include <string.h>
extern size_t __default_stacksize;
extern size_t __default_guardsize;
int pthread_setattr_default_np(const pthread_attr_t *attrp)
{
/* Reject anything in the attr object other than stack/guard size. */
pthread_attr_t tmp = *attrp, zero = { 0 };
tmp._a_stacksize = 0;
tmp._a_guardsize = 0;
if (memcmp(&tmp, &zero, sizeof tmp))
return EINVAL;
__inhibit_ptc();
if (attrp->_a_stacksize >= __default_stacksize)
__default_stacksize = attrp->_a_stacksize;
if (attrp->_a_guardsize >= __default_guardsize)
__default_guardsize = attrp->_a_guardsize;
__release_ptc();
return 0;
}
int pthread_getattr_default_np(pthread_attr_t *attrp)
{
__acquire_ptc();
*attrp = (pthread_attr_t) {
._a_stacksize = __default_stacksize,
._a_guardsize = __default_guardsize,
};
__release_ptc();
return 0;
}