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# core.sync.event

The event module provides a primitive for lightweight signaling of other threads (emulating Windows events on Posix)
License:
Distributed under the Boost Software License 1.0. (See accompanying file LICENSE)
Authors:
Rainer Schuetze

Source core/sync/event.d

struct `Event`;
  represents an event. Clients of an event are suspended while waiting for the event to be "signaled".
  Implemented using pthread_mutex and pthread_condition on Posix and CreateEvent and SetEvent on Windows.

      import core.sync.event, core.thread, std.file;

      struct ProcessFile
      {
          ThreadGroup group;
          Event event;
          void[] buffer;

          void doProcess()
          {
              event.wait();
              // process buffer
          }

          void process(string filename)
          {
              event.initialize(true, false);
              group = new ThreadGroup;
              for (int i = 0; i < 10; ++i)
                  group.create(&doProcess);

              buffer = std.file.read(filename);
              event.set();
              group.joinAll();
              event.terminate();
          }
      }

  nothrow @nogc this(bool `manualReset`, bool `initialState`);
    Creates an event object.
    Parameters:

    bool `manualReset` | the state of the event is not reset automatically after resuming waiting clients
    bool `initialState` | initial state of the signal

  nothrow @nogc void `initialize`(bool `manualReset`, bool `initialState`);
    Initializes an event object. Does nothing if the event is already initialized.
    Parameters:

    bool `manualReset` | the state of the event is not reset automatically after resuming waiting clients
    bool `initialState` | initial state of the signal

  nothrow @nogc void `terminate`();
    deinitialize event. Does nothing if the event is not initialized. There must not be threads currently waiting for the event to be signaled.
  nothrow @nogc void `set`();
    Set the event to "signaled", so that waiting clients are resumed
  nothrow @nogc void `reset`();
    Reset the event manually
  nothrow @nogc bool `wait`();
    Wait for the event to be signaled without timeout.
    Returns:
    true if the event is in signaled state, false if the event is uninitialized or another error occured
  nothrow @nogc bool `wait`(Duration `tmout`);
    Wait for the event to be signaled with timeout.
    Parameters:

    Duration `tmout` | the maximum time to wait

    Returns:
    true if the event is in signaled state, false if the event was nonsignaled for the given time or the event is uninitialized or another error occured

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