Function getCachedProcessList

cmd/dash.go:524–567

getCachedProcessList returns cached ps output or refreshes if older than 5 seconds

()

// getCachedProcessList returns cached ps output or refreshes if older than 5 seconds
func getCachedProcessList() []string {
	psCache.mutex.RLock()
	cacheAge := time.Since(psCache.timestamp)
	hasValidCache := len(psCache.lines) > 0 && cacheAge < 5*time.Second
	if hasValidCache {
		cachedLines := make([]string, len(psCache.lines))
		copy(cachedLines, psCache.lines)
		psCache.mutex.RUnlock()
		return cachedLines
	}
	psCache.mutex.RUnlock()

	// Cache miss or expired - refresh the cache
	psCache.mutex.Lock()
	defer psCache.mutex.Unlock()

	// Double-check in case another goroutine refreshed while we were waiting
	cacheAge = time.Since(psCache.timestamp)
	if len(psCache.lines) > 0 && cacheAge < 5*time.Second {
		cachedLines := make([]string, len(psCache.lines))
		copy(cachedLines, psCache.lines)
		return cachedLines
	}

	// Execute ps command to refresh cache
	cmd := exec.Command("ps", "-eo", "pgid,lstart,args")
	var out bytes.Buffer
	cmd.Stdout = &out

	if err := cmd.Run(); err != nil {
		// Return empty cache on error, don't update timestamp so next call will retry
		return []string{}
	}

	// Parse and cache the output
	output := out.String()
	psCache.lines = strings.Split(output, "\n")
	psCache.timestamp = time.Now()

	// Return a copy to avoid external modifications
	cachedLines := make([]string, len(psCache.lines))
	copy(cachedLines, psCache.lines)
	return cachedLines
}

// Simple cache to prevent re-parsing unchanged crontab files
type crontabCache struct {