move thread-id function bodies to source

Summary: Add a source file for the function bodies of `getThreadID` and `getOSThreadID`.

Differential Revision: D27698463

fbshipit-source-id: 255961954b1be07e59b19ef3006dcd6149795861

folly/system/ThreadId.cpp

+/*
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <folly/system/ThreadId.h>
+
+#include <folly/portability/PThread.h>
+#include <folly/portability/SysSyscall.h>
+#include <folly/portability/Unistd.h>
+#include <folly/portability/Windows.h>
+
+#ifdef __XROS__
+#include <xr/execution/accessors.h> // @manual
+#endif
+
+namespace folly {
+
+uint64_t getCurrentThreadID() {
+#if __APPLE__
+  return uint64_t(pthread_mach_thread_np(pthread_self()));
+#elif defined(_WIN32)
+  return uint64_t(GetCurrentThreadId());
+#elif defined(__XROS__)
+  return uint64_t(xr_execution_get_id());
+#else
+  return uint64_t(pthread_self());
+#endif
+}
+
+uint64_t getOSThreadID() {
+#if __APPLE__
+  uint64_t tid;
+  pthread_threadid_np(nullptr, &tid);
+  return tid;
+#elif defined(_WIN32)
+  return uint64_t(GetCurrentThreadId());
+#elif defined(__FreeBSD__)
+  long tid;
+  thr_self(&tid);
+  return uint64_t(tid);
+#elif defined(__XROS__)
+  return uint64_t(xr_execution_get_id());
+#else
+  return uint64_t(syscall(FOLLY_SYS_gettid));
+#endif
+}
+} // namespace folly

folly/system/ThreadId.h

@@ -18,15 +18,6 @@
 
 #include <cstdint>
 
-#include <folly/portability/PThread.h>
-#include <folly/portability/SysSyscall.h>
-#include <folly/portability/Unistd.h>
-#include <folly/portability/Windows.h>
-
-#ifdef __XROS__
-#include <xr/execution/accessors.h> // @manual
-#endif
-
 namespace folly {
 
 /**
@@ -43,17 +34,7 @@ namespace folly {
  * The thread ID may be reused once the thread it corresponds to has been
  * joined.
  */
-inline uint64_t getCurrentThreadID() {
-#if __APPLE__
-  return uint64_t(pthread_mach_thread_np(pthread_self()));
-#elif defined(_WIN32)
-  return uint64_t(GetCurrentThreadId());
-#elif defined(__XROS__)
-  return uint64_t(xr_execution_get_id());
-#else
-  return uint64_t(pthread_self());
-#endif
-}
+uint64_t getCurrentThreadID();
 
 /**
  * Get the operating-system level thread ID for the current thread.
@@ -83,21 +64,6 @@ inline uint64_t getCurrentThreadID() {
  * The thread ID may be reused once the thread it corresponds to has been
  * joined.
  */
-inline uint64_t getOSThreadID() {
-#if __APPLE__
-  uint64_t tid;
-  pthread_threadid_np(nullptr, &tid);
-  return tid;
-#elif defined(_WIN32)
-  return uint64_t(GetCurrentThreadId());
-#elif defined(__FreeBSD__)
-  long tid;
-  thr_self(&tid);
-  return uint64_t(tid);
-#elif defined(__XROS__)
-  return uint64_t(xr_execution_get_id());
-#else
-  return uint64_t(syscall(FOLLY_SYS_gettid));
-#endif
-}
+uint64_t getOSThreadID();
+
 } // namespace folly