AutoResetEvent

AutoResetEvent class

Event to notify waiting thread that resets automatically. Objects of this class should only be allocated using System::MakeObject() function. Never create instance of this type on stack or using operator new, as it will result in runtime errors and/or assertion faults. Always wrap this class into System::SmartPtr pointer and use this pointer to pass it to functions as argument.

class AutoResetEvent : public System::Threading::EventWaitHandle

Methods

MethodDescription
AutoResetEvent(bool)Constructor.
virtual void Close()Releases any resource associated with handle.
virtual bool Equals(ptr)Compares objects using C# Object.Equals semantics.
static std::enable_if<IsSmartPtr<T1>::value&&IsSmartPtr<T2>::value, bool>::type Equals(T1 const&, T2 const&)Compares reference type objects in C# style.
static std::enable_if<!IsSmartPtr<T1>::value&&!IsSmartPtr<T2>::value, bool>::type Equals(T1 const&, T2 const&)Compares value type objects in C# style.
static bool Equals(float const&, float const&)Emulates C#-style floating point comparison where two NaNs are considered equal even though according to IEC 60559:1989 NaN is not equal to any value, including NaN.
static bool Equals(double const&, double const&)Emulates C#-style floating point comparison where two NaNs are considered equal even though according to IEC 60559:1989 NaN is not equal to any value, including NaN.
EventWaitHandle(bool, EventResetMode)Constructor.
virtual bool FastCast(const Details::FastRttiBase&, void **) constFor internal purposes only.
wait_handle_t get_Handle()Gets handle.
Detail::SmartPtrCounter * GetCounter()Gets reference counter data structure associated with the object.
virtual int32_t GetHashCode() constAnalog of C# Object.GetHashCode() method. Enables hashing of custom objects.
virtual const TypeInfo& GetType() constGets actual type of object. Analog of C# System.Object.GetType() call.
virtual bool Is(const TypeInfo&) constCheck if object represents an instance of type described by targetType. Analog of C# ‘is’ operator.
void Lock()Implements C# lock() statement locking. Call directly or use LockContext sentry object.
virtual ptr MemberwiseClone() constAnalog of C# Object.MemberwiseClone() method. Enables cloning custom types.
Object()Creates object. Initializes all internal data structures.
Object(Object const&)Copy constructor. Doesn’t copy anything, really, just initializes new object and enables copy constructing subclasses.
Object& operator=(Object const&)Assignment operator. Doesn’t copy anything, really, just initializes new object and enables copy constructing subclasses.
static bool ReferenceEquals(ptr const&, ptr const&)Compares objects by reference.
static std::enable_if<!IsSmartPtr<T>::value, bool>::type ReferenceEquals(T const&, T const&)Compares objects by reference.
static std::enable_if<!IsSmartPtr<T>::value, bool>::type ReferenceEquals(T const&, std::nullptr_t)Reference-compares value type object with nullptr.
bool ReferenceEquals(String const&, std::nullptr_t)Specialization of Object::ReferenceEquals for case of string and nullptr.
bool ReferenceEquals(String const&, String const&)Specialization of Object::ReferenceEquals for case of strings.
int RemovedSharedRefs(int)Decreases shared reference count by specified value.
virtual bool Reset()Sets event to non-signalling state.
virtual bool Set()Sets event to signalling state.
virtual void SetTemplateWeakPtr(uint32_t)Set n’th template argument a weak pointer (rather than shared). Allows switching pointers in containers to weak mode.
int SharedCount() constGets current value of shared reference counter.
Object * SharedRefAdded()Increments shared reference count. Shouldn’t be called directly; instead, use smart pointers or ThisProtector.
int SharedRefRemovedSafe()Decrements and returns shared reference count. Shouldn’t be called directly; instead, use smart pointers or ThisProtector.
virtual String ToString() constAnalog of C# Object.ToString() method. Enables converting custom objects to string.
static const TypeInfo& Type()Implements C# typeof(System.Object) construct.
void Unlock()Implements C# lock() statement unlocking. Call directly or use LockContext sentry object.
static bool WaitAll(const System::ArrayPtr<System::SharedPtr<WaitHandle>>&, int)Waits for all handles to fire.
static bool WaitAll(const System::ArrayPtr<System::SharedPtr<WaitHandle>>&, TimeSpan)Waits for all handles to fire.
static bool WaitAll(const System::ArrayPtr<System::SharedPtr<WaitHandle>>&)Waits for all handles to fire.
static int WaitAny(const System::ArrayPtr<System::SharedPtr<WaitHandle>>&, int)Waits for any of the handles to fire.
static int WaitAny(const System::ArrayPtr<System::SharedPtr<WaitHandle>>&, TimeSpan)Waits for any of the handles to fire.
static int WaitAny(const System::ArrayPtr<System::SharedPtr<WaitHandle>>&)Waits for any of the handles to fire.
virtual bool WaitOne()Waits for the handle to fire for unlimited period.
virtual bool WaitOne(int)Waits for the handle to fire.
virtual bool WaitOne(TimeSpan)Waits for the handle to fire.
virtual bool WaitOne(int, bool)Waits for the handle to fire.
Detail::SmartPtrCounter * WeakRefAdded()Increments weak reference count. Shouldn’t be called directly; instead, use smart pointers or ThisProtector.
void WeakRefRemoved()Decrements weak reference count. Shouldn’t be called directly; instead, use smart pointers or ThisProtector.
~EventWaitHandle()Destructor.
virtual ~Object()Destroys object. Frees all internal data structures.
virtual ~WaitHandle()Destructor.

Fields

FieldDescription
static WaitTimeoutSpecial value to be returned by the function otherwise returning index of signalled object in array, if timeout exceeds and nothing signals.

Remarks

#include "system/threading/auto_reset_event.h"
#include "system/threading/thread.h"
#include "system/smart_ptr.h"
#include "system/string.h"
#include <iostream>
#include <vector>

int main()
{
  using namespace System::Threading;

  const auto threadsCount = 3;
  std::cout << "Threads count: " << threadsCount << std::endl;

  auto autoResetEvent = System::MakeObject<AutoResetEvent>(true);
  int x = 0;

  std::vector<System::SharedPtr<Thread>> threads;
  threads.reserve(threadsCount);
  for (auto i = 0; i < threadsCount; ++i)
  {
    threads.emplace_back(System::MakeObject<Thread>([&x, &autoResetEvent]() -> void {
      autoResetEvent->WaitOne();
      x = 1;
      for (auto i = 0; i < 5; ++i)
      {
        std::cout << Thread::get_CurrentThread()->get_Name() << ": " << x++ << std::endl;
        Thread::Sleep(100);
      }
      autoResetEvent->Set();
    }));
    threads.back()->set_Name(System::String("Thread " + std::to_string(i)));
    threads.back()->Start();
  }

  Thread::Sleep(threadsCount * 100);

  for (auto& thread : threads)
  {
    thread->Join();
  }

  return 0;
}
/*
This code example produces the following output:
Threads count: 3
Thread 0: 1
Thread 0: 2
Thread 0: 3
Thread 0: 4
Thread 0: 5
Thread 1: 1
Thread 1: 2
Thread 1: 3
Thread 1: 4
Thread 1: 5
Thread 2: 1
Thread 2: 2
Thread 2: 3
Thread 2: 4
Thread 2: 5
*/

See Also

Details_SemaphoreFullException