2015-11-05 06:59:46 +00:00
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#ifndef CRYPTOPP_WAIT_H
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#define CRYPTOPP_WAIT_H
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#include "config.h"
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#ifdef SOCKETS_AVAILABLE
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#include "misc.h"
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#include "cryptlib.h"
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#include <vector>
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#ifdef USE_WINDOWS_STYLE_SOCKETS
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#include <winsock2.h>
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#else
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#include <sys/types.h>
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#endif
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#if defined(__ANDROID__)
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#include <sys/select.h>
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#endif
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#include "hrtimer.h"
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NAMESPACE_BEGIN(CryptoPP)
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class Tracer
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{
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public:
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Tracer(unsigned int level) : m_level(level) {}
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virtual ~Tracer() {}
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protected:
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//! Override this in your most-derived tracer to do the actual tracing.
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virtual void Trace(unsigned int n, std::string const& s) = 0;
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/*! By default, tracers will decide which trace messages to trace according to a trace level
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mechanism. If your most-derived tracer uses a different mechanism, override this to
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return false. If this method returns false, the default TraceXxxx(void) methods will all
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return 0 and must be overridden explicitly by your tracer for trace messages you want. */
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virtual bool UsingDefaults() const { return true; }
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protected:
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unsigned int m_level;
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void TraceIf(unsigned int n, std::string const&s)
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{ if (n) Trace(n, s); }
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/*! Returns nr if, according to the default log settings mechanism (using log levels),
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the message should be traced. Returns 0 if the default trace level mechanism is not
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in use, or if it is in use but the event should not be traced. Provided as a utility
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method for easier and shorter coding of default TraceXxxx(void) implementations. */
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unsigned int Tracing(unsigned int nr, unsigned int minLevel) const
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{ return (UsingDefaults() && m_level >= minLevel) ? nr : 0; }
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};
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// Your Tracer-derived class should inherit as virtual public from Tracer or another
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// Tracer-derived class, and should pass the log level in its constructor. You can use the
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// following methods to begin and end your Tracer definition.
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// This constructor macro initializes Tracer directly even if not derived directly from it;
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// this is intended, virtual base classes are always initialized by the most derived class.
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#define CRYPTOPP_TRACER_CONSTRUCTOR(DERIVED) \
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public: DERIVED(unsigned int level = 0) : Tracer(level) {}
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#define CRYPTOPP_BEGIN_TRACER_CLASS_1(DERIVED, BASE1) \
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class DERIVED : virtual public BASE1, public NotCopyable { CRYPTOPP_TRACER_CONSTRUCTOR(DERIVED)
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#define CRYPTOPP_BEGIN_TRACER_CLASS_2(DERIVED, BASE1, BASE2) \
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class DERIVED : virtual public BASE1, virtual public BASE2, public NotCopyable { CRYPTOPP_TRACER_CONSTRUCTOR(DERIVED)
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#define CRYPTOPP_END_TRACER_CLASS };
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// In your Tracer-derived class, you should define a globally unique event number for each
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// new event defined. This can be done using the following macros.
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#define CRYPTOPP_BEGIN_TRACER_EVENTS(UNIQUENR) enum { EVENTBASE = UNIQUENR,
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#define CRYPTOPP_TRACER_EVENT(EVENTNAME) EventNr_##EVENTNAME,
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#define CRYPTOPP_END_TRACER_EVENTS };
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// In your own Tracer-derived class, you must define two methods per new trace event type:
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// - unsigned int TraceXxxx() const
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// Your default implementation of this method should return the event number if according
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// to the default trace level system the event should be traced, or 0 if it should not.
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// - void TraceXxxx(string const& s)
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// This method should call TraceIf(TraceXxxx(), s); to do the tracing.
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// For your convenience, a macro to define these two types of methods are defined below.
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// If you use this macro, you should also use the TRACER_EVENTS macros above to associate
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// event names with numbers.
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#define CRYPTOPP_TRACER_EVENT_METHODS(EVENTNAME, LOGLEVEL) \
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virtual unsigned int Trace##EVENTNAME() const { return Tracing(EventNr_##EVENTNAME, LOGLEVEL); } \
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virtual void Trace##EVENTNAME(std::string const& s) { TraceIf(Trace##EVENTNAME(), s); }
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/*! A simple unidirectional linked list with m_prev == 0 to indicate the final entry.
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The aim of this implementation is to provide a very lightweight and practical
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tracing mechanism with a low performance impact. Functions and methods supporting
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this call-stack mechanism would take a parameter of the form "CallStack const& callStack",
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and would pass this parameter to subsequent functions they call using the construct:
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SubFunc(arg1, arg2, CallStack("my func at place such and such", &callStack));
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The advantage of this approach is that it is easy to use and should be very efficient,
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involving no allocation from the heap, just a linked list of stack objects containing
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pointers to static ASCIIZ strings (or possibly additional but simple data if derived). */
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class CallStack
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{
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public:
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CallStack(char const* i, CallStack const* p) : m_info(i), m_prev(p) {}
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CallStack const* Prev() const { return m_prev; }
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virtual std::string Format() const;
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protected:
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char const* m_info;
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CallStack const* m_prev;
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};
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/*! An extended CallStack entry type with an additional numeric parameter. */
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class CallStackWithNr : public CallStack
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{
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public:
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CallStackWithNr(char const* i, word32 n, CallStack const* p) : CallStack(i, p), m_nr(n) {}
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std::string Format() const;
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protected:
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word32 m_nr;
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};
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/*! An extended CallStack entry type with an additional string parameter. */
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class CallStackWithStr : public CallStack
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{
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public:
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CallStackWithStr(char const* i, char const* z, CallStack const* p) : CallStack(i, p), m_z(z) {}
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std::string Format() const;
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protected:
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char const* m_z;
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};
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// Thanks to Maximilian Zamorsky for help with http://connect.microsoft.com/VisualStudio/feedback/details/1570496/
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CRYPTOPP_BEGIN_TRACER_CLASS_1(WaitObjectsTracer, Tracer)
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CRYPTOPP_BEGIN_TRACER_EVENTS(0x48752841)
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CRYPTOPP_TRACER_EVENT(NoWaitLoop)
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CRYPTOPP_END_TRACER_EVENTS
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CRYPTOPP_TRACER_EVENT_METHODS(NoWaitLoop, 1)
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CRYPTOPP_END_TRACER_CLASS
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struct WaitingThreadData;
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//! container of wait objects
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class WaitObjectContainer : public NotCopyable
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{
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public:
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//! exception thrown by WaitObjectContainer
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class Err : public Exception
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{
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public:
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Err(const std::string& s) : Exception(IO_ERROR, s) {}
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};
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static unsigned int MaxWaitObjects();
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WaitObjectContainer(WaitObjectsTracer* tracer = 0);
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void Clear();
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void SetNoWait(CallStack const& callStack);
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void ScheduleEvent(double milliseconds, CallStack const& callStack);
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// returns false if timed out
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bool Wait(unsigned long milliseconds);
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#ifdef USE_WINDOWS_STYLE_SOCKETS
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# ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
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virtual ~WaitObjectContainer();
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# else
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~WaitObjectContainer();
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#endif
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void AddHandle(HANDLE handle, CallStack const& callStack);
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#else
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void AddReadFd(int fd, CallStack const& callStack);
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void AddWriteFd(int fd, CallStack const& callStack);
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#endif
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private:
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WaitObjectsTracer* m_tracer;
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#ifdef USE_WINDOWS_STYLE_SOCKETS
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void CreateThreads(unsigned int count);
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std::vector<HANDLE> m_handles;
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std::vector<WaitingThreadData *> m_threads;
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HANDLE m_startWaiting;
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HANDLE m_stopWaiting;
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#else
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fd_set m_readfds, m_writefds;
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int m_maxFd;
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#endif
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bool m_noWait;
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double m_firstEventTime;
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Timer m_eventTimer;
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#ifdef USE_WINDOWS_STYLE_SOCKETS
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typedef size_t LastResultType;
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#else
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typedef int LastResultType;
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#endif
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enum { LASTRESULT_NOWAIT = -1, LASTRESULT_SCHEDULED = -2, LASTRESULT_TIMEOUT = -3 };
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LastResultType m_lastResult;
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unsigned int m_sameResultCount;
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Timer m_noWaitTimer;
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void SetLastResult(LastResultType result);
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void DetectNoWait(LastResultType result, CallStack const& callStack);
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};
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NAMESPACE_END
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#endif
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#endif
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