From a639e062ab6d81367c725fd1970503e20ca58214 Mon Sep 17 00:00:00 2001
From: Jelle Foks <jfoks@google.com>
Date: Wed, 10 Jan 2024 10:37:36 -0800
Subject: [PATCH] Make spinlock compatible with Starboard

---
 third_party/abseil-cpp/absl/base/BUILD.gn           |  1 +
 .../absl/base/internal/spinlock_posix.inc           | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/third_party/abseil-cpp/absl/base/BUILD.gn b/third_party/abseil-cpp/absl/base/BUILD.gn
index 3f525ac92e2e..74a518dac5c2 100644
--- a/third_party/abseil-cpp/absl/base/BUILD.gn
+++ b/third_party/abseil-cpp/absl/base/BUILD.gn
@@ -54,6 +54,7 @@ absl_source_set("spinlock_wait") {
     ":base_internal",
     ":core_headers",
     ":errno_saver",
+    "//starboard:starboard_headers_only",
   ]
   visibility = [ "//third_party/abseil-cpp/absl/base:*" ]
 }
diff --git a/third_party/abseil-cpp/absl/base/internal/spinlock_posix.inc b/third_party/abseil-cpp/absl/base/internal/spinlock_posix.inc
index 4f6f887d993c..91a8daf25d34 100644
--- a/third_party/abseil-cpp/absl/base/internal/spinlock_posix.inc
+++ b/third_party/abseil-cpp/absl/base/internal/spinlock_posix.inc
@@ -14,7 +14,11 @@
 //
 // This file is a Posix-specific part of spinlock_wait.cc
 
+#if defined(STARBOARD)
+#include "starboard/thread.h"
+#else
 #include <sched.h>
+#endif
 
 #include <atomic>
 #include <ctime>
@@ -29,6 +33,14 @@ ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)(
     std::atomic<uint32_t>* /* lock_word */, uint32_t /* value */, int loop,
     absl::base_internal::SchedulingMode /* mode */) {
   absl::base_internal::ErrnoSaver errno_saver;
+#if defined(STARBOARD)
+  if (loop == 0) {
+  } else if (loop == 1) {
+    SbThreadYield();
+  } else {
+    SbThreadSleep(loop);
+  }
+#else
   if (loop == 0) {
   } else if (loop == 1) {
     sched_yield();
@@ -38,6 +50,7 @@ ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockDelay)(
     tm.tv_nsec = absl::base_internal::SpinLockSuggestedDelayNS(loop);
     nanosleep(&tm, nullptr);
   }
+#endif
 }
 
 ABSL_ATTRIBUTE_WEAK void ABSL_INTERNAL_C_SYMBOL(AbslInternalSpinLockWake)(