Don't hold the cache lock while computing the manifest hash for the current object

clcache.py

@@ -1537,35 +1537,36 @@ def processDirect(cache, objectFile, compiler, cmdLine, sourceFile):
     baseDir = normalizeBaseDir(os.environ.get('CLCACHE_BASEDIR'))
     manifestHash = ManifestRepository.getManifestHash(compiler, cmdLine, sourceFile)
     manifestSection = cache.manifestRepository.section(manifestHash)
+    createNewManifest = False
     with cache.lock:
-        createNewManifest = False
         manifest = manifestSection.getManifest(manifestHash)
-        if manifest is not None:
-            # NOTE: command line options already included in hash for manifest name
-            try:
-                includesContentHash = ManifestRepository.getIncludesContentHashForFiles({
-                    expandBasedirPlaceholder(path, baseDir):contentHash
-                    for path, contentHash in manifest.includeFiles.items()
-                })
-
-                cachekey = manifest.includesContentToObjectMap.get(includesContentHash)
-                assert cachekey is not None
+    if manifest is not None:
+        # NOTE: command line options already included in hash for manifest name
+        try:
+            includesContentHash = ManifestRepository.getIncludesContentHashForFiles({
+                expandBasedirPlaceholder(path, baseDir):contentHash
+                for path, contentHash in manifest.includeFiles.items()
+            })
+
+            cachekey = manifest.includesContentToObjectMap.get(includesContentHash)
+            assert cachekey is not None
+            with cache.lock:
                 if cache.compilerArtifactsRepository.section(cachekey).hasEntry(cachekey):
                     return processCacheHit(cache, objectFile, cachekey)
                 else:
                     postProcessing = lambda compilerResult: postprocessObjectEvicted(
                         cache, objectFile, cachekey, compilerResult)
-            except IncludeChangedException:
-                createNewManifest = True
-                postProcessing = lambda compilerResult: postprocessHeaderChangedMiss(
-                    cache, objectFile, manifestSection, manifestHash, sourceFile, compilerResult, stripIncludes)
-            except IncludeNotFoundException:
-                # register nothing. This is probably just a compile error
-                postProcessing = None
-        else:
+        except IncludeChangedException:
             createNewManifest = True
-            postProcessing = lambda compilerResult: postprocessNoManifestMiss(
+            postProcessing = lambda compilerResult: postprocessHeaderChangedMiss(
                 cache, objectFile, manifestSection, manifestHash, sourceFile, compilerResult, stripIncludes)
+        except IncludeNotFoundException:
+            # register nothing. This is probably just a compile error
+            postProcessing = None
+    else:
+        createNewManifest = True
+        postProcessing = lambda compilerResult: postprocessNoManifestMiss(
+            cache, objectFile, manifestSection, manifestHash, sourceFile, compilerResult, stripIncludes)
 
     if createNewManifest:
         stripIncludes = False