Flesh out a page size accessor in the new API.

Implement the old API in terms of the new one. This simplifies the
implementation on Windows which can now re-use the self_process's once
initialization.

llvm-svn: 171330

1 files changed, 7 insertions, 4 deletions

diff --git a/llvm/lib/Support/Unix/Process.inc b/llvm/lib/Support/Unix/Process.inc
index e96d37ce563..9ad6272bab4 100644
--- a/llvm/lib/Support/Unix/Process.inc
+++ b/llvm/lib/Support/Unix/Process.inc
@@ -49,10 +49,7 @@ process::id_type self_process::get_id() {
   return getpid();
 }
 
-
-unsigned
-Process::GetPageSize()
-{
+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.
@@ -68,6 +65,12 @@ Process::GetPageSize()
   return static_cast<unsigned>(page_size);
 }
 
+// This constructor guaranteed to be run exactly once on a single thread, and
+// sets up various process invariants that can be queried cheaply from then on.
+self_process::self_process() : PageSize(getPageSize()) {
+}
+
+
 size_t Process::GetMallocUsage() {
 #if defined(HAVE_MALLINFO)
   struct mallinfo mi;