[openmp] Workaround bug in old Android pthread_attr_setstacksize
Round the stack size to a multiple of the page size. Older versions of
Android (until KitKat) would fail pthread_attr_setstacksize with
EINVAL if the stack size was not a multiple of the page size.
Patch by Dan Albert <danalbert@google.com>.
Test: Build, copied into the NDK, passed openmp test on ICS.
Bug: https://github.com/android-ndk/ndk/issues/9
llvm-svn: 367070
diff --git a/openmp/runtime/src/z_Linux_util.cpp b/openmp/runtime/src/z_Linux_util.cpp
index a35e1d3..5f572ab 100644
--- a/openmp/runtime/src/z_Linux_util.cpp
+++ b/openmp/runtime/src/z_Linux_util.cpp
@@ -802,6 +802,13 @@
and also gives the user the stack space they requested for all threads */
stack_size += gtid * __kmp_stkoffset * 2;
+#if defined(__ANDROID__) && __ANDROID_API__ < 19
+ // Round the stack size to a multiple of the page size. Older versions of
+ // Android (until KitKat) would fail pthread_attr_setstacksize with EINVAL
+ // if the stack size was not a multiple of the page size.
+ stack_size = (stack_size + PAGE_SIZE - 1) & ~(PAGE_SIZE - 1);
+#endif
+
KA_TRACE(10, ("__kmp_create_worker: T#%d, default stacksize = %lu bytes, "
"__kmp_stksize = %lu bytes, final stacksize = %lu bytes\n",
gtid, KMP_DEFAULT_STKSIZE, __kmp_stksize, stack_size));