cef/include/capi/cef_waitable_event_capi.h

// Copyright (c) 2024 Marshall A. Greenblatt. All rights reserved.
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#ifndef CEF_INCLUDE_CAPI_CEF_WAITABLE_EVENT_CAPI_H_
#define CEF_INCLUDE_CAPI_CEF_WAITABLE_EVENT_CAPI_H_
#pragma once

#include "include/capi/cef_base_capi.h"

#ifdef __cplusplus
extern "C" {
#endif

///
/// WaitableEvent is a thread synchronization tool that allows one thread to
/// wait for another thread to finish some work. This is equivalent to using a
/// Lock+ConditionVariable to protect a simple boolean value. However, using
/// WaitableEvent in conjunction with a Lock to wait for a more complex state
/// change (e.g., for an item to be added to a queue) is not recommended. In
/// that case consider using a ConditionVariable instead of a WaitableEvent. It
/// is safe to create and/or signal a WaitableEvent from any thread. Blocking on
/// a WaitableEvent by calling the *wait() functions is not allowed on the
/// browser process UI or IO threads.
///
typedef struct _cef_waitable_event_t {
  ///
  /// Base structure.
  ///
  cef_base_ref_counted_t base;

  ///
  /// Put the event in the un-signaled state.
  ///
  void(CEF_CALLBACK* reset)(struct _cef_waitable_event_t* self);

  ///
  /// Put the event in the signaled state. This causes any thread blocked on
  /// Wait to be woken up.
  ///
  void(CEF_CALLBACK* signal)(struct _cef_waitable_event_t* self);

  ///
  /// Returns true (1) if the event is in the signaled state, else false (0). If
  /// the event was created with |automatic_reset| set to true (1) then calling
  /// this function will also cause a reset.
  ///
  int(CEF_CALLBACK* is_signaled)(struct _cef_waitable_event_t* self);

  ///
  /// Wait indefinitely for the event to be signaled. This function will not
  /// return until after the call to signal() has completed. This function
  /// cannot be called on the browser process UI or IO threads.
  ///
  void(CEF_CALLBACK* wait)(struct _cef_waitable_event_t* self);

  ///
  /// Wait up to |max_ms| milliseconds for the event to be signaled. Returns
  /// true (1) if the event was signaled. A return value of false (0) does not
  /// necessarily mean that |max_ms| was exceeded. This function will not return
  /// until after the call to signal() has completed. This function cannot be
  /// called on the browser process UI or IO threads.
  ///
  int(CEF_CALLBACK* timed_wait)(struct _cef_waitable_event_t* self,
                                int64_t max_ms);
} cef_waitable_event_t;

///
/// Create a new waitable event. If |automatic_reset| is true (1) then the event
/// state is automatically reset to un-signaled after a single waiting thread
/// has been released; otherwise, the state remains signaled until reset() is
/// called manually. If |initially_signaled| is true (1) then the event will
/// start in the signaled state.
///
CEF_EXPORT cef_waitable_event_t* cef_waitable_event_create(
    int automatic_reset,
    int initially_signaled);

#ifdef __cplusplus
}
#endif

#endif  // CEF_INCLUDE_CAPI_CEF_WAITABLE_EVENT_CAPI_H_