1 files changed, 100 insertions, 0 deletions
diff --git a/store/works/life/operating-system-experiment/Mutex.cpp b/store/works/life/operating-system-experiment/Mutex.cpp
new file mode 100644
index 0000000..8acfdc5
--- /dev/null
+++ b/store/works/life/operating-system-experiment/Mutex.cpp
@@ -0,0 +1,100 @@
+#include "Mutex.h"
+
+#include <cassert>
+
+#ifndef CRU_WINDOWS
+#include <errno.h>
+#endif
+
+namespace cru {
+Mutex::Mutex() {
+#ifdef CRU_WINDOWS
+  handle_ = CreateMutexW(nullptr, FALSE, nullptr);
+  assert(handle_);
+#else
+  mutex_ = std::make_unique<pthread_mutex_t>();
+
+  auto c = pthread_mutex_init(mutex_.get(), nullptr);
+  assert(c == 0);
+#endif
+}
+
+Mutex::Mutex(Mutex &&other)
+#ifdef CRU_WINDOWS
+    : handle_(other.handle_)
+#else
+    : mutex_(std::move(other.mutex_))
+#endif
+{
+#ifdef CRU_WINDOWS
+  other.handle_ = nullptr;
+#endif
+}
+
+Mutex &Mutex::operator=(Mutex &&other) {
+  if (this != &other) {
+    Destroy();
+#ifdef CRU_WINDOWS
+    handle_ = other.handle_;
+    other.handle_ = nullptr;
+#else
+    mutex_ = std::move(other.mutex_);
+#endif
+  }
+  return *this;
+}
+
+Mutex::~Mutex() { Destroy(); }
+
+void Mutex::Lock() {
+#ifdef CRU_WINDOWS
+  auto c = WaitForSingleObject(handle_, INFINITE);
+  assert(c == WAIT_OBJECT_0);
+#else
+  assert(mutex_);
+  auto c = pthread_mutex_lock(mutex_.get());
+  assert(c == 0);
+#endif
+}
+
+bool Mutex::TryLock() {
+#ifdef CRU_WINDOWS
+  auto c = WaitForSingleObject(handle_, 0);
+  assert(c == WAIT_OBJECT_0 || c == WAIT_TIMEOUT);
+  return c == WAIT_OBJECT_0 ? true : false;
+#else
+  assert(mutex_);
+  auto c = pthread_mutex_trylock(mutex_.get());
+  assert(c == 0 || c == EBUSY);
+  return c == 0 ? true : false;
+#endif
+}
+
+void Mutex::Unlock() {
+#ifdef CRU_WINDOWS
+  auto c = ReleaseMutex(handle_);
+  assert(c);
+#else
+  assert(mutex_);
+  auto c = pthread_mutex_unlock(mutex_.get());
+  assert(c == 0);
+#endif
+}
+
+void Mutex::Destroy() {
+#ifdef CRU_WINDOWS
+  if (handle_ != nullptr) {
+    auto c = CloseHandle(handle_);
+    assert(c);
+    handle_ = nullptr;
+  }
+#else
+  if (mutex_ != nullptr) {
+    auto c = pthread_mutex_destroy(mutex_.get());
+    assert(c == 0);
+    mutex_ = nullptr;
+  }
+#endif
+}
+
+} // namespace cru