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Windows/Path.inc: [PR6270] PathV1::makeUnique(): Give arbitrary initial seed for workaround. 

FIXME: We should use sys::fs::unique_file() in future.
llvm-svn: 127723
This commit is contained in:
NAKAMURA Takumi 2011-03-16 02:53:24 +00:00
parent c91fa6d19f
commit aaa9b4f824
1 changed files with 11 additions and 1 deletions
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12
llvm/lib/Support/Windows/Path.inc
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@ -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)