[Mammoth] Move Mutex and Semaphore to a separate folder.

lib/mammoth/sync/mutex.cpp

@@ -0,0 +1,27 @@
+#include "sync/mutex.h"
+
+#include <zcall.h>
+
+Mutex::Mutex(Mutex&& other) : mutex_cap_(other.mutex_cap_) {
+  other.mutex_cap_ = 0;
+}
+
+Mutex& Mutex::operator=(Mutex&& other) {
+  // TODO: Release existing mutex if it exists.
+  mutex_cap_ = other.mutex_cap_;
+  other.mutex_cap_ = 0;
+  return *this;
+}
+
+glcr::ErrorOr<Mutex> Mutex::Create() {
+  z_cap_t mutex_cap;
+  RET_ERR(ZMutexCreate(&mutex_cap));
+  return Mutex(mutex_cap);
+}
+
+glcr::ErrorCode Mutex::Lock() {
+  return static_cast<glcr::ErrorCode>(ZMutexLock(mutex_cap_));
+}
+glcr::ErrorCode Mutex::Release() {
+  return static_cast<glcr::ErrorCode>(ZMutexRelease(mutex_cap_));
+}