Overview

This PR adds a DestroyAll() method to the syncx.Pool type to enable proactive destruction of all pooled resources. This addresses scenarios where the existing passive maxAge mechanism is insufficient for immediate resource cleanup.

Problem Statement

When managing dynamic resources (e.g., network connections, client instances) with syncx.Pool, there was no built-in way to proactively destroy all resources when the pool is no longer needed. The existing maxAge mechanism only passively cleans up expired resources, which isn't sufficient for scenarios like:

1. Removing an obsolete pool (e.g., when a target service goes offline)
2. Forcefully refreshing all resources in the pool (e.g., after configuration changes)
3. Avoiding resource leaks when pools are dynamically replaced in a map

Solution

The new DestroyAll() method provides immediate, complete cleanup of all pooled resources:

// Example usage for industrial communication scenario
pool := syncx.NewPool(10, createModbusClient, destroyConnection)
// ... use the pool ...
// When device address changes, immediately clean up old connections
pool.DestroyAll()

Implementation Details

• Thread-safe: Uses the existing pool's mutex lock mechanism
• Complete cleanup: Destroys all pooled resources by traversing the internal linked list
• State reset: Resets internal state (head = nil, created = 0)
• Goroutine-friendly: Uses Broadcast() to wake up any goroutines waiting for resources
• Robust: Handles edge cases like empty pools and nil destroy functions
• Non-breaking: Pool continues to work normally after DestroyAll(), creating new resources as needed

Testing

Added comprehensive test coverage including:

• Basic functionality verification
• Thread safety under concurrent operations
• Edge case handling (empty pools, nil destroy functions)
• Integration with existing pool operations
• Proper goroutine wake-up behavior

All existing tests pass, ensuring no regressions.

Use Cases

Perfect for scenarios requiring immediate resource cleanup:

• Service management: Clean up connection pools when backend services go offline
• Configuration changes: Refresh all resources when connection parameters change
• Dynamic pool management: Prevent resource leaks in applications that create/destroy pools dynamically

Closes #xxxx

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