update libraries

lib/ESPAsyncWebServer/src/AsyncWebSynchronization.h

@@ -0,0 +1,134 @@
+#ifndef ASYNCWEBSYNCHRONIZATION_H_
+#define ASYNCWEBSYNCHRONIZATION_H_
+
+// Synchronisation is only available on ESP32, as the ESP8266 isn't using FreeRTOS by default
+
+#include <ESPAsyncWebServer.h>
+
+#ifdef ESP32
+
+// This is the ESP32 version of the Sync Lock, using the FreeRTOS Semaphore
+// Modified 'AsyncWebLock' to just only use mutex since pxCurrentTCB is not
+// always available. According to example by Arjan Filius, changed name,
+// added unimplemented version for ESP8266
+class AsyncPlainLock
+{
+private:
+  SemaphoreHandle_t _lock;
+
+public:
+  AsyncPlainLock() {
+    _lock = xSemaphoreCreateBinary();
+    // In this fails, the system is likely that much out of memory that
+    // we should abort anyways. If assertions are disabled, nothing is lost..
+    assert(_lock);
+    xSemaphoreGive(_lock);
+  }
+
+  ~AsyncPlainLock() {
+    vSemaphoreDelete(_lock);
+  }
+
+  bool lock() const {
+      xSemaphoreTake(_lock, portMAX_DELAY);
+      return true;
+  }
+
+  void unlock() const {
+    xSemaphoreGive(_lock);
+  }
+};
+
+// This is the ESP32 version of the Sync Lock, using the FreeRTOS Semaphore
+class AsyncWebLock
+{
+private:
+    SemaphoreHandle_t _lock;
+    mutable TaskHandle_t _lockedBy{};
+
+public:
+    AsyncWebLock()
+    {
+        _lock = xSemaphoreCreateBinary();
+        // In this fails, the system is likely that much out of memory that
+        // we should abort anyways. If assertions are disabled, nothing is lost..
+        assert(_lock);
+        _lockedBy = NULL;
+        xSemaphoreGive(_lock);
+    }
+
+    ~AsyncWebLock() {
+        vSemaphoreDelete(_lock);
+    }
+
+    bool lock() const {
+        const auto currentTask = xTaskGetCurrentTaskHandle();
+        if (_lockedBy != currentTask) {
+            xSemaphoreTake(_lock, portMAX_DELAY);
+            _lockedBy = currentTask;
+            return true;
+        }
+        return false;
+    }
+
+    void unlock() const {
+        _lockedBy = NULL;
+        xSemaphoreGive(_lock);
+    }
+};
+
+#else
+
+// This is the 8266 version of the Sync Lock which is currently unimplemented
+class AsyncWebLock
+{
+
+public:
+  AsyncWebLock() {
+  }
+
+  ~AsyncWebLock() {
+  }
+
+  bool lock() const {
+    return false;
+  }
+
+  void unlock() const {
+  }
+};
+
+// Same for AsyncPlainLock, for ESP8266 this is just the unimplemented version above. 
+using AsyncPlainLock = AsyncWebLock;
+
+#endif
+
+class AsyncWebLockGuard
+{
+private:
+  const AsyncWebLock *_lock;
+
+public:
+  AsyncWebLockGuard(const AsyncWebLock &l) {
+    if (l.lock()) {
+      _lock = &l;
+    } else {
+      _lock = NULL;
+    }
+  }
+
+  ~AsyncWebLockGuard() {
+    if (_lock) {
+      _lock->unlock();
+    }
+  }
+
+  void unlock() {
+    if (_lock) {
+      _lock->unlock();
+      _lock = NULL;
+    }
+  }
+};
+
+#endif // ASYNCWEBSYNCHRONIZATION_H_