From 31fb174dd295e50f7c5cf18d31fcfd5fe5a063b7 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Tue, 8 Nov 2016 12:09:05 -0500 Subject: add limited pthread_setattr_default_np API to set stack size defaults MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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. --- src/thread/pthread_setattr_default_np.c | 35 +++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 src/thread/pthread_setattr_default_np.c (limited to 'src/thread/pthread_setattr_default_np.c') diff --git a/src/thread/pthread_setattr_default_np.c b/src/thread/pthread_setattr_default_np.c new file mode 100644 index 00000000..ffd2712b --- /dev/null +++ b/src/thread/pthread_setattr_default_np.c @@ -0,0 +1,35 @@ +#include "pthread_impl.h" +#include + +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; +} -- cgit v1.2.1