From 483eb2f56657e8e7f419ab1a4fab8dce9ade8609 Mon Sep 17 00:00:00 2001
From: Daniel Baumann <daniel.baumann@progress-linux.org>
Date: Sat, 27 Apr 2024 20:24:20 +0200
Subject: Adding upstream version 14.2.21.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
---
 .../libs/thread/example/ba_externallly_locked.cpp  | 120 +++++++++++++++++++++
 1 file changed, 120 insertions(+)
 create mode 100644 src/boost/libs/thread/example/ba_externallly_locked.cpp

(limited to 'src/boost/libs/thread/example/ba_externallly_locked.cpp')

diff --git a/src/boost/libs/thread/example/ba_externallly_locked.cpp b/src/boost/libs/thread/example/ba_externallly_locked.cpp
new file mode 100644
index 00000000..e9387676
--- /dev/null
+++ b/src/boost/libs/thread/example/ba_externallly_locked.cpp
@@ -0,0 +1,120 @@
+// Copyright (C) 2012 Vicente Botet
+//
+//  Distributed under the Boost Software License, Version 1.0. (See accompanying
+//  file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+
+#define BOOST_THREAD_VERSION 4
+
+#include <boost/thread/mutex.hpp>
+#include <boost/thread/lockable_adapter.hpp>
+#include <boost/thread/externally_locked.hpp>
+#include <boost/thread/strict_lock.hpp>
+#include <boost/thread/lock_types.hpp>
+#include <iostream>
+
+#ifdef BOOST_MSVC
+# pragma warning(disable: 4355) // 'this' : used in base member initializer list
+#endif
+
+using namespace boost;
+
+class BankAccount
+{
+  int balance_;
+public:
+  void Deposit(int amount)
+  {
+    balance_ += amount;
+  }
+  void Withdraw(int amount)
+  {
+    balance_ -= amount;
+  }
+  int GetBalance()
+  {
+    return balance_;
+  }
+};
+
+//[AccountManager
+class AccountManager: public basic_lockable_adapter<mutex>
+{
+public:
+  typedef basic_lockable_adapter<mutex> lockable_base_type;
+  AccountManager() :
+    lockable_base_type(), checkingAcct_(*this), savingsAcct_(*this)
+  {
+  }
+  inline void Checking2Savings(int amount);
+  inline void AMoreComplicatedChecking2Savings(int amount);
+private:
+  /*<-*/
+  bool some_condition()
+  {
+    return true;
+  } /*->*/
+  externally_locked<BankAccount, AccountManager > checkingAcct_;
+  externally_locked<BankAccount, AccountManager > savingsAcct_;
+};
+//]
+
+//[Checking2Savings
+void AccountManager::Checking2Savings(int amount)
+{
+  strict_lock<AccountManager> guard(*this);
+  checkingAcct_.get(guard).Withdraw(amount);
+  savingsAcct_.get(guard).Deposit(amount);
+}
+//]
+
+//#if DO_NOT_COMPILE
+////[AMoreComplicatedChecking2Savings_DO_NOT_COMPILE
+//void AccountManager::AMoreComplicatedChecking2Savings(int amount) {
+//    unique_lock<AccountManager> guard(*this);
+//    if (some_condition()) {
+//        guard.lock();
+//    }
+//    checkingAcct_.get(guard).Withdraw(amount);
+//    savingsAcct_.get(guard).Deposit(amount);
+//    guard1.unlock();
+//}
+////]
+//#elif DO_NOT_COMPILE_2
+////[AMoreComplicatedChecking2Savings_DO_NOT_COMPILE2
+//void AccountManager::AMoreComplicatedChecking2Savings(int amount) {
+//    unique_lock<AccountManager> guard1(*this);
+//    if (some_condition()) {
+//        guard1.lock();
+//    }
+//    {
+//        strict_lock<AccountManager> guard(guard1);
+//        checkingAcct_.get(guard).Withdraw(amount);
+//        savingsAcct_.get(guard).Deposit(amount);
+//    }
+//    guard1.unlock();
+//}
+////]
+//#else
+////[AMoreComplicatedChecking2Savings
+void AccountManager::AMoreComplicatedChecking2Savings(int amount) {
+    unique_lock<AccountManager> guard1(*this);
+    if (some_condition()) {
+        guard1.lock();
+    }
+    {
+        nested_strict_lock<unique_lock<AccountManager> > guard(guard1);
+        checkingAcct_.get(guard).Withdraw(amount);
+        savingsAcct_.get(guard).Deposit(amount);
+    }
+    guard1.unlock();
+}
+////]
+//#endif
+
+int main()
+{
+  AccountManager mgr;
+  mgr.Checking2Savings(100);
+  return 0;
+}
+
-- 
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