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authorStanislaw Halik <sthalik@misaki.pl>2019-04-30 22:48:52 +0200
committerStanislaw Halik <sthalik@misaki.pl>2019-04-30 22:48:52 +0200
commit7eab970bfad0e31b4e915110bc79267067e32376 (patch)
treec1bc21325d43d3dba33c8b63c41a7f66fc175b75
parentc5443e1b3912cd1b7091db9814cf65a429d951e7 (diff)
compat/thread-name: only call dlsym once
-rw-r--r--compat/thread-name.cpp21
1 files changed, 13 insertions, 8 deletions
diff --git a/compat/thread-name.cpp b/compat/thread-name.cpp
index d12a59ca..504c6f19 100644
--- a/compat/thread-name.cpp
+++ b/compat/thread-name.cpp
@@ -47,21 +47,26 @@ static inline void set_curthread_name_old(const QString&) {}
#endif
+using SetThreadDescr_type = HRESULT (__stdcall *)(HANDLE, const wchar_t*);
+
+static SetThreadDescr_type get_funptr()
+{
+ HMODULE module;
+ if (GetModuleHandleExA(0, "kernel32.dll", &module))
+ return (SetThreadDescr_type)GetProcAddress(module, "SetThreadDescription");
+ else
+ return nullptr;
+}
+
void set_curthread_name(const QString& name)
{
static_assert(sizeof(wchar_t) == sizeof(decltype(*QString().utf16())));
+ static const SetThreadDescr_type fn = get_funptr();
- HMODULE module;
- HRESULT (__stdcall *fn)(HANDLE, const wchar_t*);
- if (GetModuleHandleExA(0, "kernel32.dll", &module) &&
- (fn = (decltype(fn))GetProcAddress(module, "SetThreadDescription")))
- {
+ if (fn)
fn(GetCurrentThread(), (const wchar_t*)name.utf16());
- }
else
- {
set_curthread_name_old(name);
- }
}
#else