Security-59306.11.20.tar.gz

[apple/security.git] / OSX / utilities / src / sec_action.h

diff --git a/OSX/utilities/src/sec_action.h b/OSX/utilities/src/sec_action.h
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--- a/OSX/utilities/src/sec_action.h
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-/*
- * Copyright (c) 2017 Apple Inc. All Rights Reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-#ifndef _SEC_ACTION_H_
-#define _SEC_ACTION_H_
-
-#include <dispatch/dispatch.h>
-
-/*
- * Simple dispatch-based mechanism to coalesce high-frequency actions like
- * notifications. Sample usage:
- *
- *  static void
- *  notify_frequent_event(void)
- *  {
- *      static dispatch_once_t once;
- *      static sec_action_t action;
- *
- *      dispatch_once(&once, ^{
- *          action = sec_action_create("frequent_event", 2);
- *          sec_action_set_handler(action, ^{
- *              (void)notify_post("com.apple.frequent_event");
- *          });
- *      });
- *
- *      sec_action_perform(action);
- *  }
- *
- * The above will prevent com.apple.frequent_event from being posted more than
- * once every 2 seconds. For example, if notify_frequent_event is called 1000 times
- * over the span of 1.9s, the handler will be called twice, at 0s and 2s (approx).
- *
- * Default behavior is to perform actions on a queue with the same QOS as the caller.
- * If the action should be performed on a specific serial queue, the function
- * sec_action_create_with_queue can alternatively be used.
- */
-
-typedef dispatch_source_t sec_action_t;
-
-__BEGIN_DECLS
-
-DISPATCH_MALLOC DISPATCH_RETURNS_RETAINED DISPATCH_WARN_RESULT DISPATCH_NONNULL_ALL DISPATCH_NOTHROW
-sec_action_t
-sec_action_create(const char *label, uint64_t interval);
-
-DISPATCH_MALLOC DISPATCH_RETURNS_RETAINED DISPATCH_WARN_RESULT DISPATCH_NOTHROW
-sec_action_t
-sec_action_create_with_queue(dispatch_queue_t queue, const char *label, uint64_t interval);
-
-DISPATCH_NONNULL_ALL DISPATCH_NOTHROW
-void
-sec_action_set_handler(sec_action_t action, dispatch_block_t handler);
-
-DISPATCH_NONNULL_ALL
-void
-sec_action_perform(sec_action_t action);
-
-__END_DECLS
-
-#endif /* _SEC_ACTION_H_ */