diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/storage/ipc/dsm_impl.c | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/src/backend/storage/ipc/dsm_impl.c b/src/backend/storage/ipc/dsm_impl.c index 2056668ae99..811ac0437ce 100644 --- a/src/backend/storage/ipc/dsm_impl.c +++ b/src/backend/storage/ipc/dsm_impl.c @@ -673,8 +673,17 @@ dsm_impl_windows(dsm_op op, dsm_handle handle, Size request_size, /* Create new segment or open an existing one for attach. */ if (op == DSM_OP_CREATE) { - DWORD size_high = (DWORD) (request_size >> 32); - DWORD size_low = (DWORD) request_size; + DWORD size_high; + DWORD size_low; + + /* Shifts >= the width of the type are undefined. */ +#ifdef _WIN64 + size_high = request_size >> 32; +#else + size_high = 0; +#endif + size_low = (DWORD) request_size; + hmap = CreateFileMapping(INVALID_HANDLE_VALUE, /* Use the pagefile */ NULL, /* Default security attrs */ PAGE_READWRITE, /* Memory is read/write */ |