dispatch: Add CreateQueue, Main

dispatch/queue.go

@@ -9,7 +9,8 @@ package dispatch
 // void Dispatch_Release(void* queue);
 // void Dispatch_Async(void* queue, uintptr_t task);
 // void Dispatch_Sync(void* queue, uintptr_t task);
-// void* Dispatch_Create_Queue(const char* label, void* attr);
+// void* Dispatch_Create_Queue(const char* label, int type);
+// void Dispatch_Main();
 import "C"
 import (
 	"math"
@@ -31,6 +32,13 @@ const (
 	QueuePriorityBackground QueuePriority = math.MinInt16
 )
 
+type QueueType int
+
+const (
+	QueueTypeSerial     QueueType = 0
+	QueueTypeConcurrent QueueType = 1
+)
+
 // Returns the serial dispatch queue associated with the application’s main thread. [Full Topic]
 //
 // [Full Topic]: https://developer.apple.com/documentation/dispatch/1452921-dispatch_get_main_queue?language=objc
@@ -75,11 +83,16 @@ func runQueueTask(p C.uintptr_t) {
 	h.Delete()
 }
 
+// Main executes blocks submitted to the main queue.
+func Main() {
+	C.Dispatch_Main()
+}
+
 // Creates a new dispatch queue to which blocks can be submitted.
 //
 // [Full Topic]: https://developer.apple.com/documentation/dispatch/1453030-dispatch_queue_create?language=objc
-func CreateQueue(label string, attr uintptr) Queue {
+func CreateQueue(label string, queueType QueueType) Queue {
 	cLabel := C.CString(label)
-	p := C.Dispatch_Create_Queue(cLabel, unsafe.Pointer(attr))
+	p := C.Dispatch_Create_Queue(cLabel, C.int(queueType))
 	return Queue{p}
 }

dispatch/queue.m

@@ -33,7 +33,13 @@ void Dispatch_Sync(void* queue, uintptr_t task) {
     });
 }
 
-void* Dispatch_Create_Queue(const char* label, void* attr) {
-    dispatch_queue_t queue = dispatch_queue_create(label, attr);
-    return queue;
+void Dispatch_Main() {
+    dispatch_main();
+}
+
+void* Dispatch_Create_Queue(const char* label, int type) {
+    if (type == 0) {
+        return dispatch_queue_create(label, DISPATCH_QUEUE_SERIAL);
+    }
+    return dispatch_queue_create(label, DISPATCH_QUEUE_CONCURRENT);
 }