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Note that fieldcapabilitiesMu is aRWMutex inMCPServer for controlling concurrent read/write operations to fieldcapabilities. At most of time,capabilities 's membersresource/tools/prompts/ will only be set not to benil for one time when we call funcNewMCPServer at the beginning or when we call funcAddResource/AddResourceTemplate/AddPrompt/AddTools for the first time. So, for fieldcapabilitiesMu, the number of its read operations far exceeds the number of write operations, for which we could utilizeRLock and double-checking technique to optimizes the concurrency performance for theAddXxx functions mentioned above. experiment
Summary by CodeRabbit
Refactor
Enhanced internal performance and responsiveness when adding resources, templates, prompts, or tools. No changes to user-facing features or functionality.
This change updates the locking mechanism in theMCPServer struct methods responsible for adding resources, resource templates, prompts, and tools. Instead of always acquiring an exclusive lock to check and initialize capability fields, the code now uses a double-checked locking pattern: it first checks the field under a shared read lock, only escalating to an exclusive lock if initialization is required. This reduces the duration of exclusive lock holding oncapabilitiesMu. No public API signatures were altered.
Changes
Files/Paths
Change Summary
server/server.go
Refactored locking inAddResource,AddResourceTemplate,AddPrompt, andAddTools to use double-checked locking withcapabilitiesMu, reducing exclusive lock contention during capability initialization.
Possibly related PRs
Fix tool calls #38: Also modifies capability initialization inserver.go, changing from eager to lazy initialization in the same methods affected by this PR.
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cryo-zd changed the titlerefact: optimize usage of RWMutex in MCPServer for performanceperf: optimize usage of RWMutex in MCPServer for performanceApr 23, 2025
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Note that field
capabilitiesMuis aRWMutexinMCPServerfor controlling concurrent read/write operations to fieldcapabilities.At most of time,
capabilities's membersresource/tools/prompts/will only be set not to benilfor one time when we call funcNewMCPServerat the beginning or when we call funcAddResource/AddResourceTemplate/AddPrompt/AddToolsfor the first time.So, for field
capabilitiesMu, the number of its read operations far exceeds the number of write operations, for which we could utilizeRLockand double-checking technique to optimizes the concurrency performance for theAddXxxfunctions mentioned above.experiment
Summary by CodeRabbit