From 7dac70835cfe89563a8be0ee832a2b035b96b669 Mon Sep 17 00:00:00 2001
From: Mike Kruskal <mkruskal@google.com>
Date: Mon, 6 Apr 2026 08:17:23 -0700
Subject: [PATCH] Expose gloop peer friendship for testing

PiperOrigin-RevId: 895336821
Change-Id: I178e7d654e45de4af6bba133b496115c6d37adc1
---
 absl/synchronization/internal/per_thread_sem.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/absl/synchronization/internal/per_thread_sem.h b/absl/synchronization/internal/per_thread_sem.h
index 144ab3cd..704f3dac 100644
--- a/absl/synchronization/internal/per_thread_sem.h
+++ b/absl/synchronization/internal/per_thread_sem.h
@@ -31,6 +31,10 @@
 #include "absl/synchronization/internal/create_thread_identity.h"
 #include "absl/synchronization/internal/kernel_timeout.h"
 
+namespace gloop_do_not_use {
+struct SynchronizationBenchmarkPeer;
+}  // namespace gloop_do_not_use
+
 namespace absl {
 ABSL_NAMESPACE_BEGIN
 
@@ -77,6 +81,7 @@ class PerThreadSem {
   // Permitted callers.
   friend class PerThreadSemTest;
   friend class absl::Mutex;
+  friend struct ::gloop_do_not_use::SynchronizationBenchmarkPeer;
   friend void OneTimeInitThreadIdentity(absl::base_internal::ThreadIdentity*);
 };