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为了兼容不同的平台，这个类采用了impl模式，win平台通过CRITICAL_SECTION, 这样的话还是相对比较简单，具体就不详解了，不过不得不说boost的实现方式就要复杂到哪里去了，当然，好处就是功能强大，坏处就是学习成本高，会用的人少。
#if defined(OS_WIN)
#include <windows.h>
#elif defined(OS_POSIX)
#include <pthread.h>
#endif
#include "base/base_export.h"
#include "base/basictypes.h"
namespace base {
namespace internal {
// This class implements the underlying platform-specific spin-lock mechanism
// used for the Lock class. Most users should not use LockImpl directly, but
// should instead use Lock.
class BASE_EXPORT LockImpl {
public:
#if defined(OS_WIN)
typedef CRITICAL_SECTION NativeHandle;
#elif defined(OS_POSIX)
typedef pthread_mutex_t NativeHandle;
#endif
LockImpl();
~LockImpl();
// If the lock is not held, take it and return true. If the lock is already
// held by something else, immediately return false.
bool Try();
// Take the lock, blocking until it is available if necessary.
void Lock();
// Release the lock. This must only be called by the lock‘s holder: after
// a successful call to Try, or a call to Lock.
void Unlock();
// Return the native underlying lock.
// TODO(awalker): refactor lock and condition variables so that this is
// unnecessary.
NativeHandle* native_handle() { return &native_handle_; }
private:
NativeHandle native_handle_;
DISALLOW_COPY_AND_ASSIGN(LockImpl);
};
} // namespace internal
} // namespace base
#endif // BASE_SYNCHRONIZATION_LOCK_IMPL_H_
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原文地址：http://www.cnblogs.com/csxy/p/5453145.html
