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src/os_cpu/bsd_x86/vm/os_bsd_x86.cpp
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rev 13436 : 8186286: [BSD] Primary thread's stack size is reported incorrectly
Reviewed-by: shade, stuefe
*** 906,915 ****
--- 906,921 ----
void *stacktop = pthread_get_stackaddr_np(self);
*size = pthread_get_stacksize_np(self);
// workaround for OS X 10.9.0 (Mavericks)
// pthread_get_stacksize_np returns 128 pages even though the actual size is 2048 pages
if (pthread_main_np() == 1) {
+ // At least on Mac OS 10.12 we have observed stack sizes not alligned
+ // to pages boundries. This can be provoked by e.g. setrlimit() (ulimit -s xxxx in the
+ // shell). Apparently Mac OS actually rounds upwards to next multiple of page size,
+ // however, I round downwards here to be on the safe side.
+ *size = align_down(*size, getpagesize());
+
if ((*size) < (DEFAULT_MAIN_THREAD_STACK_PAGES * (size_t)getpagesize())) {
char kern_osrelease[256];
size_t kern_osrelease_size = sizeof(kern_osrelease);
int ret = sysctlbyname("kern.osrelease", kern_osrelease, &kern_osrelease_size, NULL, 0);
if (ret == 0) {
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