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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 12:45:03 -05:00
parent ea7891a651
commit 31fb174dd2
3 changed files with 45 additions and 4 deletions
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src/thread/pthread_create.c
+8 -4
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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) {