Migrate WebRequestRedirectByRegExAction to use RE2 and roll RE2 to revision 97:401ab4168e8e

third_party/re2/util/mutex.h

Index: third_party/re2/util/mutex.h
diff --git a/third_party/re2/util/mutex.h b/third_party/re2/util/mutex.h
index 4bb6fecc54002fc7b099a1f8c1ecdc33b49d077b..e321fae7360e036dfb7eee510e61cdb9d6e760c1 100644
--- a/third_party/re2/util/mutex.h
+++ b/third_party/re2/util/mutex.h
@@ -76,7 +76,7 @@ class Mutex {
   MutexType mutex_;
 
   // Catch the error of writing Mutex when intending MutexLock.
-  Mutex(Mutex *ignored) {}
+  Mutex(Mutex *ignored);
   // Disallow "evil" constructors
   Mutex(const Mutex&);
   void operator=(const Mutex&);
@@ -189,6 +189,27 @@ class WriterMutexLock {
 #define ReaderMutexLock(x) COMPILE_ASSERT(0, rmutex_lock_decl_missing_var_name)
 #define WriterMutexLock(x) COMPILE_ASSERT(0, wmutex_lock_decl_missing_var_name)
 
+// Provide safe way to declare and use global, linker-initialized mutex. Sigh.
+#ifdef HAVE_PTHREAD
+
+#define GLOBAL_MUTEX(name) \
+	static pthread_mutex_t (name) = PTHREAD_MUTEX_INITIALIZER
+#define GLOBAL_MUTEX_LOCK(name) \
+	pthread_mutex_lock(&(name))
+#define GLOBAL_MUTEX_UNLOCK(name) \
+	pthread_mutex_unlock(&(name))
+
+#else
+
+#define GLOBAL_MUTEX(name) \
+	static Mutex name
+#define GLOBAL_MUTEX_LOCK(name) \
+	name.Lock()
+#define GLOBAL_MUTEX_UNLOCK(name) \
+	name.Unlock()
+
+#endif
+
 }  // namespace re2
 
 #endif  /* #define RE2_UTIL_MUTEX_H_ */