Use folly::atomic_compare_exchange_strong_explicit in futures

Summary: This helps avoid TSAN false positives.

Reviewed By: yfeldblum

Differential Revision: D20787056

fbshipit-source-id: e62537235e3ad876e3ec5266f9c449d0d8340330

folly/futures/detail/Core.h

@@ -209,8 +209,9 @@ class DeferredExecutor final {
     }
     DCHECK(state == State::EMPTY);
     func_ = std::move(func);
-    if (state_.compare_exchange_strong(
-            state,
+    if (folly::atomic_compare_exchange_strong_explicit(
+            &state_,
+            &state,
             State::HAS_FUNCTION,
             std::memory_order_release,
             std::memory_order_acquire)) {
@@ -240,8 +241,9 @@ class DeferredExecutor final {
     executor_ = std::move(executor);
     auto state = state_.load(std::memory_order_acquire);
     if (state == State::EMPTY &&
-        state_.compare_exchange_strong(
-            state,
+        folly::atomic_compare_exchange_strong_explicit(
+            &state_,
+            &state,
             State::HAS_EXECUTOR,
             std::memory_order_release,
             std::memory_order_acquire)) {
@@ -269,8 +271,9 @@ class DeferredExecutor final {
     }
     auto state = state_.load(std::memory_order_acquire);
     if (state == State::EMPTY &&
-        state_.compare_exchange_strong(
-            state,
+        folly::atomic_compare_exchange_strong_explicit(
+            &state_,
+            &state,
             State::DETACHED,
             std::memory_order_release,
             std::memory_order_acquire)) {