[EM] Support mmap backed ellpack. (#10602)

- Support resource view in ellpack.
- Define the CUDA version of MMAP resource.
- Define the CUDA version of malloc resource.
- Refactor cuda runtime API wrappers, and add memory access related wrappers.
- gather windows macros into a single header.

include/xgboost/base.h

@@ -7,6 +7,8 @@
 #define XGBOOST_BASE_H_
 
 #include <dmlc/omp.h>  // for omp_uint, omp_ulong
+// Put the windefs here to guard as many files as possible.
+#include <xgboost/windefs.h>
 
 #include <cstdint>  // for int32_t, uint64_t, int16_t
 #include <ostream>  // for ostream

include/xgboost/collective/poll_utils.h

@@ -4,13 +4,14 @@
  * \author Tianqi Chen
  */
 #pragma once
-#include "xgboost/collective/result.h"
-#include "xgboost/collective/socket.h"
+#include <xgboost/collective/result.h>
+#include <xgboost/collective/socket.h>
 
 #if defined(_WIN32)
+#include <xgboost/windefs.h>
+// Socket API
 #include <winsock2.h>
 #include <ws2tcpip.h>
-
 #else
 
 #include <arpa/inet.h>

include/xgboost/collective/socket.h

@@ -1,12 +1,8 @@
 /**
- * Copyright (c) 2022-2024, XGBoost Contributors
+ * Copyright 2022-2024, XGBoost Contributors
  */
 #pragma once
 
-#if !defined(NOMINMAX) && defined(_WIN32)
-#define NOMINMAX
-#endif                   // !defined(NOMINMAX)
-
 #include <cerrno>        // errno, EINTR, EBADF
 #include <climits>       // HOST_NAME_MAX
 #include <cstddef>       // std::size_t
@@ -18,18 +14,12 @@
 
 #if defined(__linux__)
 #include <sys/ioctl.h>  // for TIOCOUTQ, FIONREAD
-#endif  // defined(__linux__)
-
-#if !defined(xgboost_IS_MINGW)
-
-#if defined(__MINGW32__)
-#define xgboost_IS_MINGW 1
-#endif  // defined(__MINGW32__)
-
-#endif  // xgboost_IS_MINGW
+#endif                  // defined(__linux__)
 
 #if defined(_WIN32)
-
+// Guard the include.
+#include <xgboost/windefs.h>
+// Socket API
 #include <winsock2.h>
 #include <ws2tcpip.h>
 
@@ -41,9 +31,9 @@ using in_port_t = std::uint16_t;
 
 #if !defined(xgboost_IS_MINGW)
 using ssize_t = int;
-#endif                    // !xgboost_IS_MINGW()
+#endif  // !xgboost_IS_MINGW()
 
-#else                     // UNIX
+#else  // UNIX
 
 #include <arpa/inet.h>    // inet_ntop
 #include <fcntl.h>        // fcntl, F_GETFL, O_NONBLOCK
@@ -839,7 +829,3 @@ Result INetNToP(H const &host, std::string *p_out) {
 }  // namespace xgboost
 
 #undef xgboost_CHECK_SYS_CALL
-
-#if defined(xgboost_IS_MINGW)
-#undef xgboost_IS_MINGW
-#endif

include/xgboost/windefs.h

@@ -0,0 +1,33 @@
+/**
+ * Copyright 2024, XGBoost Contributors
+ *
+ * @brief Macro for Windows.
+ */
+#pragma once
+
+#if !defined(xgboost_IS_WIN)
+
+#if defined(_MSC_VER) || defined(__MINGW32__)
+#define xgboost_IS_WIN 1
+#endif  // defined(_MSC_VER) || defined(__MINGW32__)
+
+#endif  // !defined(xgboost_IS_WIN)
+
+#if defined(xgboost_IS_WIN)
+
+#if !defined(NOMINMAX)
+#define NOMINMAX
+#endif  // !defined(NOMINMAX)
+
+// A macro used inside `windows.h` to avoid conflicts with `winsock2.h`
+#define WIN32_LEAN_AND_MEAN
+
+#if !defined(xgboost_IS_MINGW)
+
+#if defined(__MINGW32__)
+#define xgboost_IS_MINGW 1
+#endif  // defined(__MINGW32__)
+
+#endif  // xgboost_IS_MINGW
+
+#endif  // defined(xgboost_IS_WIN)