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Pre-Vista leveldb::port::InitOnce implementation

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This commit is contained in:
Pieter Wuille 2012-12-12 02:20:18 +01:00 committed by Gavin Andresen
parent 21f2ae7563
commit 960797a0de
2 changed files with 21 additions and 8 deletions
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7
src/leveldb/port/port_win.cc
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@ -123,13 +123,8 @@ AtomicPointer::AtomicPointer(void* v) {
Release_Store(v);
}
BOOL CALLBACK InitHandleFunction (PINIT_ONCE InitOnce, PVOID func, PVOID *lpContext) {
((void (*)())func)();
return true;
}
void InitOnce(OnceType* once, void (*initializer)()) {
InitOnceExecuteOnce((PINIT_ONCE)once, InitHandleFunction, initializer, NULL);
once->InitOnce(initializer);
}
void* AtomicPointer::Acquire_Load() const {

22
src/leveldb/port/port_win.h
View file

@ -93,8 +93,26 @@ class CondVar {
};
typedef void* OnceType;
#define LEVELDB_ONCE_INIT 0
class OnceType {
public:
// OnceType() : init_(false) {}
OnceType(const OnceType &once) : init_(once.init_) {}
OnceType(bool f) : init_(f) {}
void InitOnce(void (*initializer)()) {
mutex_.Lock();
if (!init_) {
init_ = true;
initializer();
}
mutex_.Unlock();
}
private:
bool init_;
Mutex mutex_;
};
#define LEVELDB_ONCE_INIT false
extern void InitOnce(port::OnceType*, void (*initializer)());
// Storage for a lock-free pointer