From 81d1e0bcac2a43bd44f15f72149731b6759d496c Mon Sep 17 00:00:00 2001 From: Bill Wendling Date: Thu, 24 Mar 2011 06:17:12 +0000 Subject: --- Merging r127723 into '.': U lib/Support/Windows/Path.inc git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_29@128202 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Support/Windows/Path.inc | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/lib/Support/Windows/Path.inc b/lib/Support/Windows/Path.inc index 625f67aa91..d6b582318d 100644 --- a/lib/Support/Windows/Path.inc +++ b/lib/Support/Windows/Path.inc @@ -882,7 +882,17 @@ Path::makeUnique(bool reuse_current, std::string* ErrMsg) { // Find a numeric suffix that isn't used by an existing file. Assume there // won't be more than 1 million files with the same prefix. Probably a safe // bet. - static unsigned FCounter = 0; + static int FCounter = -1; + if (FCounter < 0) { + // Give arbitrary initial seed. + // FIXME: We should use sys::fs::unique_file() in future. + LARGE_INTEGER cnt64; + DWORD x = GetCurrentProcessId(); + x = (x << 16) | (x >> 16); + if (QueryPerformanceCounter(&cnt64)) // RDTSC + x ^= cnt64.HighPart ^ cnt64.LowPart; + FCounter = x % 1000000; + } do { sprintf(FNBuffer+offset, "-%06u", FCounter); if (++FCounter > 999999) -- cgit v1.2.3-18-g5258