Remove priority mutex (#644)

* Removed hal::priority_condition_variable

* Replaced uses of priority mutexes with std::mutex and std::recursive_mutex

This allowed replacing a use of std::condition_variable_any with
std::condition_variable.

* Replaced all uses of std::recursive_mutex with std::mutex equivalents

hal/src/main/native/shared/handles/HandlesInternal.cpp

@@ -8,20 +8,19 @@
 #include "HAL/handles/HandlesInternal.h"
 
 #include <algorithm>
+#include <mutex>
 
 #include <llvm/SmallVector.h>
 
-#include "HAL/cpp/priority_mutex.h"
-
 namespace hal {
 static llvm::SmallVector<HandleBase*, 32> globalHandles;
-static priority_mutex& GetGlobalHandleMutex() {
-  static priority_mutex globalHandleMutex;
+static std::mutex& GetGlobalHandleMutex() {
+  static std::mutex globalHandleMutex;
   return globalHandleMutex;
 }
 
 HandleBase::HandleBase() {
-  std::lock_guard<priority_mutex> lock(GetGlobalHandleMutex());
+  std::lock_guard<std::mutex> lock(GetGlobalHandleMutex());
   auto index = std::find(globalHandles.begin(), globalHandles.end(), this);
   if (index == globalHandles.end()) {
     globalHandles.push_back(this);
@@ -31,7 +30,7 @@ HandleBase::HandleBase() {
 }
 
 HandleBase::~HandleBase() {
-  std::lock_guard<priority_mutex> lock(GetGlobalHandleMutex());
+  std::lock_guard<std::mutex> lock(GetGlobalHandleMutex());
   auto index = std::find(globalHandles.begin(), globalHandles.end(), this);
   if (index != globalHandles.end()) {
     *index = nullptr;
@@ -46,7 +45,7 @@ void HandleBase::ResetHandles() {
 }
 
 void HandleBase::ResetGlobalHandles() {
-  std::unique_lock<priority_mutex> lock(GetGlobalHandleMutex());
+  std::unique_lock<std::mutex> lock(GetGlobalHandleMutex());
   for (auto&& i : globalHandles) {
     if (i != nullptr) {
       lock.unlock();