- return bool from Thread::trySleep()

- updated documentiation
- amended tests
- updated CHANGELOG

CHANGELOG

@@ -33,10 +33,27 @@ Release 1.5.3 (2014-05-xx)
 - fixed GH #380: SecureSocket+DialogSocket crashes with SIGSEGV when timeout occours
 - Improve RSADigestEngine, using Poco::Crypto::DigestEngine to calculate hash before signing
 - added Poco::PBKDF2Engine
+- Fixed GH #380: SecureSocket+DialogSocket crashes with SIGSEGV when timeout occours
 - added support for a 'Priority' attribute on cookies.
 - GH #386: fixed bug in MailMessage without content-transfer-encoding header
 - GH #384: ew hash algorithms support for RSADigestEngine
-
+- fixed Clock overflow bug on Windows
+- Poco::ByteOrder now uses intrinsics, if available
+- CMake: added /bigobj option for msvc
+- Fix typo to restore Net/TestSuite_x64_vs120 build
+- correct path for CONFIGURE_FILE in CMakeLists.txt
+- Building Poco 1.5.2 for Synology RS812+ (Intel Atom) (honor POCO_NO_INOTIFY)
+- added WEC2013 support to buildwin.cmd and buildwin.ps1
+- HTMLForm: in URL encoding, percent-encode more characters
+- Fixed #include <linux/if.h> conflict with other libraries 
+- Poco::Net::X509Certificate::verify() no longer uses DNS reverse lookups to validate host names
+- cert hostname validation is case insensitive and stricter for wildcard certificates
+- TCPServer: do not reduce the capacity of the default ThreadPool
+- added POCO_LOG_DEBUG flag
+- Zip: fixed a crash caused by an I/O error
+- added runtest script for windows
+- added SQlite Full Text Search support
+- added Thread::trySleep() and Thread::wakeUp()
 
 Release 1.5.2 (2013-09-16)
 ==========================

Foundation/include/Poco/Runnable.h

@@ -62,7 +62,7 @@ public:
 protected:
 	void sleep(long milliseconds);
 
-	void trySleep(long milliseconds);
+	bool trySleep(long milliseconds);
 };
 
 

Foundation/include/Poco/Thread.h

@@ -187,16 +187,27 @@ public:
 	bool isRunning() const;
 		/// Returns true if the thread is running.
 
-	void trySleep(long milliseconds);
-		/// Starts an interruptible sleep. Thread will remain suspended
-		/// until (a) the timeout expires or (b) wakeUp() is called.
-		/// The trySleep()/wakeUp() pair of functions should be used with
-		/// understanding that this suspended state is not a true sleep, 
+	bool trySleep(long milliseconds);
+		/// Starts an interruptible sleep. When trySleep() is called,
+		/// the thread will remain suspended until:
+		///   - the timeout expires or 
+		///   - wakeUp() is called
+		/// 
+		/// Function returns true if sleep attempt was completed, false
+		/// if sleep was interrupted by a wakeUp() call.
+		/// A frequent scenario where trySleep()/wakeUp() pair of functions
+		/// is useful is with threads spending most of the time idle,
+		/// with periodic activity between the idle times; trying to sleep
+		/// (as opposed to sleeping) allows immediate ending of idle thread
+		/// from the outside.
+		/// 
+		/// The trySleep() and wakeUp() calls should be used with 
+		/// understanding that the suspended state is not a true sleep, 
 		/// but rather a state of waiting for an event, with timeout 
-		/// expiration. This in essence means that calling wakeUp() 
-		/// before calling  trySleep() will prevent the next trySleep() 
-		/// call to actually suspend the thread (which, in some scenarios,
-		/// may be desirable behavior).
+		/// expiration. This makes order of calls significantant; calling 
+		/// wakeUp()  before calling trySleep() will prevent the next  
+		/// trySleep() call to actually suspend the thread (which, in 
+		/// some scenarios, may be desirable behavior).
 
 	void wakeUp();
 		/// Wakes up the thread which is in the state of interruptible

Foundation/src/Runnable.cpp

@@ -57,9 +57,9 @@ void Runnable::sleep(long milliseconds)
 }
 
 
-void Runnable::trySleep(long milliseconds)
+bool Runnable::trySleep(long milliseconds)
 {
-	Thread::current()->trySleep(milliseconds);
+	return Thread::current()->trySleep(milliseconds);
 }
 
 

Foundation/src/Thread.cpp

@@ -60,18 +60,18 @@ namespace Poco {
 Thread::Thread(): 
 	_id(uniqueId()), 
 	_name(makeName()), 
-	_pTLS(0)
+	_pTLS(0),
+	_event(true)
 {
-	_event.reset();
 }
 
 
 Thread::Thread(const std::string& name): 
 	_id(uniqueId()), 
 	_name(name), 
-	_pTLS(0)
+	_pTLS(0),
+	_event(true)
 {
-	_event.reset();
 }
 
 
@@ -124,10 +124,9 @@ bool Thread::tryJoin(long milliseconds)
 }
 
 
-void Thread::trySleep(long milliseconds)
+bool Thread::trySleep(long milliseconds)
 {
-	_event.tryWait(milliseconds);
-	_event.reset();
+	return !_event.tryWait(milliseconds);
 }
 
 void Thread::wakeUp()

Foundation/testsuite/src/ThreadTest.cpp

@@ -137,17 +137,17 @@ private:
 class TrySleepRunnable : public Runnable
 {
 public:
-	TrySleepRunnable() : _counter(0)
+	TrySleepRunnable() : _counter(0), _sleepy(true)
 	{
 	}
 
 	void run()
 	{
-		trySleep(300000);
+		_sleepy = !trySleep(300000);
 		++_counter;
-		trySleep(300000);
+		_sleepy = !trySleep(300000);
 		++_counter;
-		trySleep(10);
+		_sleepy = !trySleep(10);
 		++_counter;
 	}
 
@@ -156,8 +156,14 @@ public:
 		return _counter;
 	}
 
+	bool isSleepy() const
+	{
+		return _sleepy;
+	}
+
 private:
 	int _counter;
+	bool _sleepy;
 };
 
 
@@ -295,23 +301,27 @@ void ThreadTest::testTrySleep()
 {
 	Thread thread;
 	TrySleepRunnable r;
+	assert(r.isSleepy());
 	assert(!thread.isRunning());
 	assert(r.counter() == 0);
 	thread.start(r);
 	assert(thread.isRunning());
 	assert(r.counter() == 0);
+	assert(r.isSleepy());
 	Thread::sleep(100);
 	assert(r.counter() == 0);
-	thread.wakeUp();
-	Thread::sleep(10);
+	assert(r.isSleepy());
+	thread.wakeUp(); Thread::sleep(10);
 	assert(r.counter() == 1);
+	assert(r.isSleepy());
 	Thread::sleep(100);
 	assert(r.counter() == 1);
-	thread.wakeUp();
-	Thread::sleep(10);
+	thread.wakeUp(); Thread::sleep(10);
 	assert(r.counter() == 2);
+	assert(r.isSleepy());
 	Thread::sleep(100);
 	assert(r.counter() == 3);
+	assert(!r.isSleepy());
 	assert(!thread.isRunning());
 	thread.wakeUp();
 	assert(!thread.isRunning());