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Support/Process: Add comments about PageSize and AllocationGranularity on Cygwin and Win32.

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llvm-svn: 189940
This commit is contained in:
NAKAMURA Takumi 2013-09-04 14:12:26 +00:00
parent edaf5b018a
commit 102c898948
2 changed files with 4 additions and 2 deletions
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4
lib/Support/Unix/Process.inc
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@ -88,8 +88,8 @@ 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.
// On Cygwin, getpagesize() returns 64k(AllocationGranularity) and
// offset in mmap(3) should be aligned to the AllocationGranularity.
static unsigned getPageSize() {
#if defined(HAVE_GETPAGESIZE)
const int page_size = ::getpagesize();

2
lib/Support/Windows/Process.inc
View File

@ -83,6 +83,8 @@ static unsigned getPageSize() {
// that LLVM ought to run as 64-bits on a 64-bit system, anyway.
SYSTEM_INFO info;
GetSystemInfo(&info);
// FIXME: FileOffset in MapViewOfFile() should be aligned to not dwPageSize,
// but dwAllocationGranularity.
return static_cast<unsigned>(info.dwPageSize);
}