Endpoint syscalls implemented

zion/object/endpoint.cpp

@@ -0,0 +1,43 @@
+#include "object/endpoint.h"
+
+#include "scheduler/scheduler.h"
+
+glcr::RefPtr<Endpoint> Endpoint::Create() {
+  return glcr::AdoptPtr(new Endpoint);
+}
+
+glcr::ErrorCode Endpoint::Write(uint64_t num_bytes, const void* data,
+                                z_cap_t reply_port_cap) {
+  MutexHolder h(mutex_);
+  RET_ERR(message_queue_.PushBack(num_bytes, data, 1, &reply_port_cap));
+
+  if (blocked_threads_.size() > 0) {
+    auto thread = blocked_threads_.PopFront();
+    thread->SetState(Thread::RUNNABLE);
+    gScheduler->Enqueue(thread);
+  }
+
+  return glcr::OK;
+}
+glcr::ErrorCode Endpoint::Read(uint64_t* num_bytes, void* data,
+                               z_cap_t* reply_port_cap) {
+  mutex_.Lock();
+  while (message_queue_.empty()) {
+    auto thread = gScheduler->CurrentThread();
+    thread->SetState(Thread::BLOCKED);
+    mutex_.Unlock();
+    gScheduler->Yield();
+    mutex_.Lock();
+  }
+  mutex_.Unlock();
+
+  MutexHolder h(mutex_);
+
+  uint64_t num_caps = 1;
+  RET_ERR(message_queue_.PopFront(num_bytes, data, &num_caps, reply_port_cap));
+
+  if (num_caps != 1) {
+    return glcr::INTERNAL;
+  }
+  return glcr::OK;
+}