From 05cae938cbe1ac8807f4913044d9bee46dc3a0e1 Mon Sep 17 00:00:00 2001
From: Jay Kwak <82421531+jkwak-work@users.noreply.github.com>
Date: Tue, 14 Oct 2025 17:07:03 -0700
Subject: Retry file reads in slang-test to handle intermittent I/O errors
 (#8713)

Related #8705
---
 tools/slang-test/slang-test-main.cpp | 36 +++++++++++++++++++++++++++++++++---
 1 file changed, 33 insertions(+), 3 deletions(-)

(limited to 'tools')

diff --git a/tools/slang-test/slang-test-main.cpp b/tools/slang-test/slang-test-main.cpp
index 36e79659f..0095a5867 100644
--- a/tools/slang-test/slang-test-main.cpp
+++ b/tools/slang-test/slang-test-main.cpp
@@ -557,13 +557,43 @@ static SlangResult _gatherTestsForFile(
 
     String fileContents;
 
-    SlangResult readResult = Slang::File::readAllText(filePath, fileContents);
+    TestReporter* testReporter = nullptr;
+    if (context)
+        testReporter = context->getTestReporter();
+
+    // Try reading the file with retries on failure to handle intermittent I/O errors
+    // (commonly seen on macOS in CI environments)
+    SlangResult readResult = SLANG_FAIL;
+    for (int retryCount = 0; retryCount < 3 && SLANG_FAILED(readResult); ++retryCount)
+    {
+        if (retryCount)
+        {
+            if (testReporter)
+            {
+                testReporter->messageFormat(
+                    TestMessageType::Info,
+                    "Retrying to read test file '%s' (attempt %d)",
+                    filePath.getBuffer(),
+                    retryCount + 1);
+            }
+            else
+            {
+                fprintf(
+                    stderr,
+                    "Retrying to read test file '%s' (attempt %d)\n",
+                    filePath.getBuffer(),
+                    retryCount + 1);
+            }
+            std::this_thread::sleep_for(std::chrono::milliseconds(retryCount * 100));
+        }
+        readResult = Slang::File::readAllText(filePath, fileContents);
+    }
     if (SLANG_FAILED(readResult))
     {
         // Log file reading failure with details (thread-safe)
-        if (context && context->getTestReporter())
+        if (testReporter)
         {
-            context->getTestReporter()->messageFormat(
+            testReporter->messageFormat(
                 TestMessageType::RunError,
                 "Failed to read test file '%s' (error: 0x%08X)",
                 filePath.getBuffer(),
-- 
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