cef/include/capi/cef_task_capi.h

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

#include "include/capi/cef_base_capi.h"

#ifdef __cplusplus
extern "C" {
#endif

///
/// Implement this structure for asynchronous task execution. If the task is
/// posted successfully and if the associated message loop is still running then
/// the execute() function will be called on the target thread. If the task
/// fails to post then the task object may be destroyed on the source thread
/// instead of the target thread. For this reason be cautious when performing
/// work in the task object destructor.
///
typedef struct _cef_task_t {
  ///
  /// Base structure.
  ///
  cef_base_ref_counted_t base;

  ///
  /// Method that will be executed on the target thread.
  ///
  void(CEF_CALLBACK* execute)(struct _cef_task_t* self);
} cef_task_t;

///
/// Structure that asynchronously executes tasks on the associated thread. It is
/// safe to call the functions of this structure on any thread.
///
/// CEF maintains multiple internal threads that are used for handling different
/// types of tasks in different processes. The cef_thread_id_t definitions in
/// cef_types.h list the common CEF threads. Task runners are also available for
/// other CEF threads as appropriate (for example, V8 WebWorker threads).
///
typedef struct _cef_task_runner_t {
  ///
  /// Base structure.
  ///
  cef_base_ref_counted_t base;

  ///
  /// Returns true (1) if this object is pointing to the same task runner as
  /// |that| object.
  ///
  int(CEF_CALLBACK* is_same)(struct _cef_task_runner_t* self,
                             struct _cef_task_runner_t* that);

  ///
  /// Returns true (1) if this task runner belongs to the current thread.
  ///
  int(CEF_CALLBACK* belongs_to_current_thread)(struct _cef_task_runner_t* self);

  ///
  /// Returns true (1) if this task runner is for the specified CEF thread.
  ///
  int(CEF_CALLBACK* belongs_to_thread)(struct _cef_task_runner_t* self,
                                       cef_thread_id_t threadId);

  ///
  /// Post a task for execution on the thread associated with this task runner.
  /// Execution will occur asynchronously.
  ///
  int(CEF_CALLBACK* post_task)(struct _cef_task_runner_t* self,
                               struct _cef_task_t* task);

  ///
  /// Post a task for delayed execution on the thread associated with this task
  /// runner. Execution will occur asynchronously. Delayed tasks are not
  /// supported on V8 WebWorker threads and will be executed without the
  /// specified delay.
  ///
  int(CEF_CALLBACK* post_delayed_task)(struct _cef_task_runner_t* self,
                                       struct _cef_task_t* task,
                                       int64_t delay_ms);
} cef_task_runner_t;

///
/// Returns the task runner for the current thread. Only CEF threads will have
/// task runners. An NULL reference will be returned if this function is called
/// on an invalid thread.
///
CEF_EXPORT cef_task_runner_t* cef_task_runner_get_for_current_thread(void);

///
/// Returns the task runner for the specified CEF thread.
///
CEF_EXPORT cef_task_runner_t* cef_task_runner_get_for_thread(
    cef_thread_id_t threadId);

///
/// Returns true (1) if called on the specified thread. Equivalent to using
/// cef_task_runner_t::GetForThread(threadId)->belongs_to_current_thread().
///
CEF_EXPORT int cef_currently_on(cef_thread_id_t threadId);

///
/// Post a task for execution on the specified thread. Equivalent to using
/// cef_task_runner_t::GetForThread(threadId)->PostTask(task).
///
CEF_EXPORT int cef_post_task(cef_thread_id_t threadId, cef_task_t* task);

///
/// Post a task for delayed execution on the specified thread. Equivalent to
/// using cef_task_runner_t::GetForThread(threadId)->PostDelayedTask(task,
/// delay_ms).
///
CEF_EXPORT int cef_post_delayed_task(cef_thread_id_t threadId,
                                     cef_task_t* task,
                                     int64_t delay_ms);

#ifdef __cplusplus
}
#endif

#endif  // CEF_INCLUDE_CAPI_CEF_TASK_CAPI_H_