[llvm] [CAS] Account for LLVM_ENABLE_THREADS=OFF in unit tests (PR #217251)

[David Spickett via llvm-commits]

https://github.com/DavidSpickett created https://github.com/llvm/llvm-project/pull/217251

Added in  1cf7984259827c3fc58b340a51feaeec7e2894fd / #213331.

These unit tests fail to build when LLVM_ENABLE_THREADS is OFF:
<...>/libCASPluginTest.cpp:801:25: error:
no member named 'sleep_for' in namespace 'std::this_thread'
  801 |       std::this_thread::sleep_for(std::chrono::milliseconds(50));
      |                         ^~~~~~~~~

As far as I can tell, we can just not do the sleep when threads are off. Everything becomes single threaded and the delays are not needed.

>From c5105d7469d3a012a0eaa0f9ffdfcf0119d0bd9d Mon Sep 17 00:00:00 2001
From: David Spickett <david.spickett at arm.com>
Date: Wed, 19 Aug 2026 09:15:58 +0000
Subject: [PATCH] [CAS] Account for LLVM_ENABLE_THREADS=OFF in unit tests

Added in  1cf7984259827c3fc58b340a51feaeec7e2894fd / #213331.

These unit tests fail to build when LLVM_ENABLE_THREADS
is OFF:
<...>/libCASPluginTest.cpp:801:25: error:
no member named 'sleep_for' in namespace 'std::this_thread'
  801 |       std::this_thread::sleep_for(std::chrono::milliseconds(50));
      |                         ^~~~~~~~~

As far as I can tell, we can just not do the sleep when
threads are off. Everything becomes single threaded
and the delays are not needed.
---
 llvm/tools/libCASPluginTest/libCASPluginTest.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/llvm/tools/libCASPluginTest/libCASPluginTest.cpp b/llvm/tools/libCASPluginTest/libCASPluginTest.cpp
index cf2c1f9bbcd7e..282760073962c 100644
--- a/llvm/tools/libCASPluginTest/libCASPluginTest.cpp
+++ b/llvm/tools/libCASPluginTest/libCASPluginTest.cpp
@@ -590,8 +590,10 @@ void llcas_cas_load_object_async(llcas_cas_t c_cas, llcas_objectid_t c_id,
     OS << "load_object_async downstream begin: " << PrintedDigest << '\n';
   });
   unwrap(c_cas)->Pool.async([=] {
+#if LLVM_ENABLE_THREADS
     // Wait a bit for the caller to proceed.
     std::this_thread::sleep_for(std::chrono::milliseconds(100));
+#endif
     auto &Wrap = *unwrap(c_cas);
     if (CancelState->Cancelled) {
       Wrap.syncErrs([&](raw_ostream &OS) {
@@ -739,8 +741,10 @@ void llcas_actioncache_get_for_digest_async(
 
   unwrap(c_cas)->Pool.async([=] {
     if (IsCancellable) {
+#if LLVM_ENABLE_THREADS
       // Wait a bit for the caller to have a chance to cancel.
       std::this_thread::sleep_for(std::chrono::milliseconds(50));
+#endif
     }
     auto &Wrap = *unwrap(c_cas);
     if (CancelState->Cancelled) {
@@ -797,8 +801,10 @@ void llcas_actioncache_put_for_digest_async(
 
   unwrap(c_cas)->Pool.async([=] {
     if (IsCancellable) {
+#if LLVM_ENABLE_THREADS
       // Wait a bit for the caller to have a chance to cancel.
       std::this_thread::sleep_for(std::chrono::milliseconds(50));
+#endif
     }
     auto &Wrap = *unwrap(c_cas);
     if (CancelState->Cancelled) {