Add work queue for requests

work_queue.odin

@@ -0,0 +1,77 @@
+#+private package
+package fjord 
+
+import "base:runtime"
+import "core:net"
+import "core:sync"
+
+WorkQueue :: struct {
+    items:     [dynamic]net.TCP_Socket,
+    capacity:  int,
+    mutex:     sync.Mutex,
+    not_empty: sync.Cond,
+    shutdown:  bool,
+    allocator: runtime.Allocator,
+}
+
+work_queue_init :: proc(
+    work_queue: ^WorkQueue,
+    capacity: int,
+    allocator := context.allocator,
+) {
+    work_queue^ = {
+        items     = make([dynamic]net.TCP_Socket, 0, capacity, allocator),
+        capacity  = capacity,
+        shutdown  = false,
+        allocator = allocator,
+    }
+}
+
+work_queue_destroy :: proc(work_queue: ^WorkQueue) {
+    sync.mutex_lock(&work_queue.mutex)
+    for socket in work_queue.items {
+        net.close(socket)
+    }
+    sync.mutex_unlock(&work_queue.mutex)
+
+    delete(work_queue.items)
+}
+
+work_queue_enqueue :: proc(work_queue: ^WorkQueue, socket: net.TCP_Socket) -> bool {
+    sync.mutex_lock(&work_queue.mutex)
+    defer sync.mutex_unlock(&work_queue.mutex)
+
+    if work_queue.shutdown do return false
+
+    if len(work_queue.items) >= work_queue.capacity {
+        return false
+    }
+
+    append(&work_queue.items, socket)
+    sync.cond_signal(&work_queue.not_empty)
+    return true
+}
+
+work_queue_dequeue :: proc(work_queue: ^WorkQueue) -> (socket: net.TCP_Socket, ok: bool) {
+    sync.mutex_lock(&work_queue.mutex)
+    defer sync.mutex_unlock(&work_queue.mutex)
+
+    for len(work_queue.items) == 0 && !work_queue.shutdown {
+        sync.cond_wait(&work_queue.not_empty, &work_queue.mutex)
+    }
+
+    if work_queue.shutdown && len(work_queue.items) == 0 {
+        return socket, false
+    }
+
+    socket = pop_front(&work_queue.items)
+    return socket, true
+}
+
+work_queue_shutdown :: proc(work_queue: ^WorkQueue) {
+    sync.mutex_lock(&work_queue.mutex)
+    defer sync.mutex_unlock(&work_queue.mutex)
+
+    work_queue.shutdown = true
+    sync.cond_broadcast(&work_queue.not_empty)
+}