allocate()

template<typename T, fl::size SLAB_SIZE = FASTLED_DEFAULT_SLAB_SIZE>

T * fl::SlabAllocator< T, SLAB_SIZE >::allocate ( fl::size n = 1 )

inline

Definition at line 625 of file allocator.h.

                                           {
        if (n == 0) {
            return nullptr;
        }
 
        // Thread safety (FastLED#3588): slab-backed containers
        // (fl::map/set via allocator_slab) share a static per-type
        // SlabAllocator across FreeRTOS tasks — e.g. the esp_http_server
        // task building Response headers while the main loop mutates its
        // own maps. Unsynchronized free-list/bitset updates corrupted
        // the slab and crashed classic ESP32 under WiFi traffic.
        fl::detail::slab_lock_guard guard(mMutex);
 
        // Try to allocate from slab first
        void* ptr = allocateFromSlab(n);
        if (ptr) {
            fl::memset(ptr, 0, sizeof(T) * n);
            return static_cast<T*>(ptr);
        }
        
        // Fall back to regular malloc for large allocations
        ptr = Malloc(sizeof(T) * n);
        if (ptr) {
            fl::memset(ptr, 0, sizeof(T) * n);
        }
        return static_cast<T*>(ptr);
    }

References allocateFromSlab(), fl::FL_NO_EXCEPT, fl::Malloc(), fl::memset(), and mMutex.

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