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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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2
include/pthread.h
View File

@ -215,6 +215,8 @@ int pthread_getaffinity_np(pthread_t, size_t, struct cpu_set_t *);
int pthread_setaffinity_np(pthread_t, size_t, const struct cpu_set_t *);
int pthread_getattr_np(pthread_t, pthread_attr_t *);
int pthread_setname_np(pthread_t, const char *);
int pthread_getattr_default_np(pthread_attr_t *);
int pthread_setattr_default_np(const pthread_attr_t *);
int pthread_tryjoin_np(pthread_t, void **);
int pthread_timedjoin_np(pthread_t, void **, const struct timespec *);
#endif

12
src/thread/pthread_create.c
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@ -163,6 +163,8 @@ static void *dummy_tsd[1] = { 0 };
weak_alias(dummy_tsd, __pthread_tsd_main);
volatile int __block_new_threads = 0;
size_t __default_stacksize = DEFAULT_STACK_SIZE;
size_t __default_guardsize = DEFAULT_GUARD_SIZE;
static FILE *volatile dummy_file = 0;
weak_alias(dummy_file, __stdin_used);
@ -186,10 +188,7 @@ int __pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict att
| CLONE_THREAD | CLONE_SYSVSEM | CLONE_SETTLS
| CLONE_PARENT_SETTID | CLONE_CHILD_CLEARTID | CLONE_DETACHED;
int do_sched = 0;
pthread_attr_t attr = {
._a_stacksize = DEFAULT_STACK_SIZE,
._a_guardsize = DEFAULT_GUARD_SIZE,
};
pthread_attr_t attr = { 0 };
if (!libc.can_do_threads) return ENOSYS;
self = __pthread_self();
@ -207,6 +206,11 @@ int __pthread_create(pthread_t *restrict res, const pthread_attr_t *restrict att
if (attrp && !c11) attr = *attrp;
__acquire_ptc();
if (!attrp || c11) {
attr._a_stacksize = __default_stacksize;
attr._a_guardsize = __default_guardsize;
}
if (__block_new_threads) __wait(&__block_new_threads, 0, 1, 1);
if (attr._a_stackaddr) {

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;
}