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author | Rich Felker <dalias@aerifal.cx> | 2016-11-08 12:09:05 -0500 |
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committer | Rich Felker <dalias@aerifal.cx> | 2016-11-08 12:45:03 -0500 |
commit | 31fb174dd295e50f7c5cf18d31fcfd5fe5a063b7 (patch) | |
tree | d0cc757d2280d4711d40de2fa7ca3121593f11be /src/thread/pthread_setattr_default_np.c | |
parent | ea7891a651dc4abc1305438470f1e4cc3b64ece2 (diff) | |
download | musl-31fb174dd295e50f7c5cf18d31fcfd5fe5a063b7.tar.gz musl-31fb174dd295e50f7c5cf18d31fcfd5fe5a063b7.tar.xz musl-31fb174dd295e50f7c5cf18d31fcfd5fe5a063b7.zip |
add limited pthread_setattr_default_np API to set stack size defaults
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.
Diffstat (limited to 'src/thread/pthread_setattr_default_np.c')
-rw-r--r-- | src/thread/pthread_setattr_default_np.c | 35 |
1 files changed, 35 insertions, 0 deletions
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 <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; +} |