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Unix/Process.inc: Revert r72332, "Work around a page size issue on Cygwin."

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Offset in mmap(3) should be aligned to gepagesize(), 64k, or mmap(3) would fail.

TODO: Invetigate places where 4096 would be required as pagesize, or 4096 would satisfy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@188903 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
NAKAMURA Takumi 2013-08-21 13:47:12 +00:00
parent 1a9f21abac
commit 8fea8f2d82
1 changed files with 3 additions and 6 deletions
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9
lib/Support/Unix/Process.inc
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@ -88,13 +88,10 @@ TimeValue self_process::get_system_time() const {
return getRUsageTimes().second;
}
// On Cygwin, getpagesize() returns 64k and offset in mmap(3) should be
// aligned to its pagesize.
static unsigned getPageSize() {
#if defined(__CYGWIN__)
// On Cygwin, getpagesize() returns 64k but the page size for the purposes of
// memory protection and mmap() is 4k.
// See http://www.cygwin.com/ml/cygwin/2009-01/threads.html#00492
const int page_size = 0x1000;
#elif defined(HAVE_GETPAGESIZE)
#if defined(HAVE_GETPAGESIZE)
const int page_size = ::getpagesize();
#elif defined(HAVE_SYSCONF)
long page_size = ::sysconf(_SC_PAGE_SIZE);