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author | Konstantin Ritt <ritt.ks@gmail.com> | 2011-10-07 12:45:12 (GMT) |
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committer | Jan-Arve Saether <jan-arve.saether@nokia.com> | 2011-10-07 12:45:12 (GMT) |
commit | 48a73353029104a4d2c5fda2c9fb007d1924c9ec (patch) | |
tree | fbfee63d17157f8ff57452273f041f94a863c38e /src/corelib/tools/qelapsedtimer_win.cpp | |
parent | 6425f239d1e01e1b55cfadde8f95ab884f4dd76c (diff) | |
download | Qt-48a73353029104a4d2c5fda2c9fb007d1924c9ec.zip Qt-48a73353029104a4d2c5fda2c9fb007d1924c9ec.tar.gz Qt-48a73353029104a4d2c5fda2c9fb007d1924c9ec.tar.bz2 |
make QElapsedTimer use QSystemLibrary on win
we also need to ensure the counterFrequency was already set up,
thus volatile (which fixes possible race condition)
Merge-request: 2655
Reviewed-by: Jan-Arve Saether <jan-arve.saether@nokia.com>
Diffstat (limited to 'src/corelib/tools/qelapsedtimer_win.cpp')
-rw-r--r-- | src/corelib/tools/qelapsedtimer_win.cpp | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/src/corelib/tools/qelapsedtimer_win.cpp b/src/corelib/tools/qelapsedtimer_win.cpp index d79dc5d..e6bce27 100644 --- a/src/corelib/tools/qelapsedtimer_win.cpp +++ b/src/corelib/tools/qelapsedtimer_win.cpp @@ -42,6 +42,8 @@ #include "qelapsedtimer.h" #include <windows.h> +#include <private/qsystemlibrary_p.h> + typedef ULONGLONG (WINAPI *PtrGetTickCount64)(void); static PtrGetTickCount64 ptrGetTickCount64 = 0; @@ -52,21 +54,17 @@ static quint64 counterFrequency = 0; static void resolveLibs() { - static bool done = false; + static volatile bool done = false; if (done) return; // try to get GetTickCount64 from the system - HMODULE kernel32 = GetModuleHandleW(L"kernel32"); - if (!kernel32) + QSystemLibrary kernel32(QLatin1String("kernel32")); + if (!kernel32.load()) return; -#if defined(Q_OS_WINCE) // does this function exist on WinCE, or will ever exist? - ptrGetTickCount64 = (PtrGetTickCount64)GetProcAddress(kernel32, L"GetTickCount64"); -#else - ptrGetTickCount64 = (PtrGetTickCount64)GetProcAddress(kernel32, "GetTickCount64"); -#endif + ptrGetTickCount64 = (PtrGetTickCount64)kernel32.resolve("GetTickCount64"); // Retrieve the number of high-resolution performance counter ticks per second LARGE_INTEGER frequency; |