Merge pull request #19017 from veblush/fork-tsan

Made Fork.support_enabled_ atomic

src/core/lib/gprpp/fork.cc

@@ -243,7 +243,7 @@ void Fork::AwaitThreads() {
 
 internal::ExecCtxState* Fork::exec_ctx_state_ = nullptr;
 internal::ThreadState* Fork::thread_state_ = nullptr;
-bool Fork::support_enabled_ = false;
+std::atomic<bool> Fork::support_enabled_;
 bool Fork::override_enabled_ = false;
 Fork::child_postfork_func Fork::reset_child_polling_engine_ = nullptr;
 }  // namespace grpc_core

src/core/lib/gprpp/fork.h

@@ -19,6 +19,10 @@
 #ifndef GRPC_CORE_LIB_GPRPP_FORK_H
 #define GRPC_CORE_LIB_GPRPP_FORK_H
 
+#include <grpc/support/port_platform.h>
+
+#include <atomic>
+
 /*
  * NOTE: FORKING IS NOT GENERALLY SUPPORTED, THIS IS ONLY INTENDED TO WORK
  *       AROUND VERY SPECIFIC USE CASES.
@@ -78,7 +82,7 @@ class Fork {
  private:
   static internal::ExecCtxState* exec_ctx_state_;
   static internal::ThreadState* thread_state_;
-  static bool support_enabled_;
+  static std::atomic<bool> support_enabled_;
   static bool override_enabled_;
   static child_postfork_func reset_child_polling_engine_;
 };