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-/*
- * Copyright (c) 2008-2009 Apple Inc. All rights reserved.
- *
- * @APPLE_APACHE_LICENSE_HEADER_START@
- * 
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- * 
- *     http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- * 
- * @APPLE_APACHE_LICENSE_HEADER_END@
- */
-
-#ifndef __DISPATCH_QUEUE__
-#define __DISPATCH_QUEUE__
-
-#ifndef __DISPATCH_INDIRECT__
-#error "Please #include <dispatch/dispatch.h> instead of this file directly."
-#include <dispatch/base.h> // for HeaderDoc
-#endif
-
-/*!
- * @header
- *
- * Dispatch is an abstract model for expressing concurrency via simple but
- * powerful API. 
- *
- * At the core, dispatch provides serial FIFO queues to which blocks may be
- * submitted. Blocks submitted to these dispatch queues are invoked on a pool
- * of threads fully managed by the system. No guarantee is made regarding
- * which thread a block will be invoked on; however, it is guaranteed that only
- * one block submitted to the FIFO dispatch queue will be invoked at a time.
- *
- * When multiple queues have blocks to be processed, the system is free to
- * allocate additional threads to invoke the blocks concurrently. When the
- * queues become empty, these threads are automatically released.
- */
-
-/*!
- * @typedef dispatch_queue_t
- *
- * @abstract
- * Dispatch queues invoke blocks submitted to them serially in FIFO order. A
- * queue will only invoke one block at a time, but independent queues may each
- * invoke their blocks concurrently with respect to each other.
- *
- * @discussion
- * Dispatch queues are lightweight objects to which blocks may be submitted.
- * The system manages a pool of threads which process dispatch queues and
- * invoke blocks submitted to them.
- *
- * Conceptually a dispatch queue may have its own thread of execution, and
- * interaction between queues is highly asynchronous.
- *
- * Dispatch queues are reference counted via calls to dispatch_retain() and
- * dispatch_release(). Pending blocks submitted to a queue also hold a
- * reference to the queue until they have finished. Once all references to a
- * queue have been released, the queue will be deallocated by the system.
- */
-DISPATCH_DECL(dispatch_queue);
-
-/*!
- * @typedef dispatch_queue_attr_t
- *
- * @abstract
- * Attribute and policy extensions for dispatch queues.
- */
-DISPATCH_DECL(dispatch_queue_attr);
-
-/*!
- * @typedef dispatch_block_t
- *
- * @abstract
- * The prototype of blocks submitted to dispatch queues, which take no
- * arguments and have no return value.
- *
- * @discussion
- * The declaration of a block allocates storage on the stack. Therefore, this
- * is an invalid construct:
- *
- * dispatch_block_t block;
- *
- * if (x) {
- *     block = ^{ printf("true\n"); };
- * } else {
- *     block = ^{ printf("false\n"); };
- * }
- * block(); // unsafe!!!
- *
- * What is happening behind the scenes:
- *
- * if (x) {
- *     struct Block __tmp_1 = ...; // setup details
- *     block = &__tmp_1;
- * } else {
- *     struct Block __tmp_2 = ...; // setup details
- *     block = &__tmp_2;
- * }
- *
- * As the example demonstrates, the address of a stack variable is escaping the
- * scope in which it is allocated. That is a classic C bug.
- */
-#ifdef __BLOCKS__
-typedef void (^dispatch_block_t)(void);
-#endif
-
-__BEGIN_DECLS
-
-/*!
- * @function dispatch_async
- *
- * @abstract
- * Submits a block for asynchronous execution on a dispatch queue.
- *
- * @discussion
- * The dispatch_async() function is the fundamental mechanism for submitting
- * blocks to a dispatch queue.
- *
- * Calls to dispatch_async() always return immediately after the block has
- * been submitted, and never wait for the block to be invoked.
- *
- * The target queue determines whether the block will be invoked serially or
- * concurrently with respect to other blocks submitted to that same queue.
- * Serial queues are processed concurrently with with respect to each other.
- * 
- * @param queue
- * The target dispatch queue to which the block is submitted.
- * The system will hold a reference on the target queue until the block
- * has finished.
- * The result of passing NULL in this parameter is undefined.
- *
- * @param block
- * The block to submit to the target dispatch queue. This function performs
- * Block_copy() and Block_release() on behalf of callers.
- * The result of passing NULL in this parameter is undefined.
- */
-#ifdef __BLOCKS__
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NONNULL_ALL DISPATCH_NOTHROW
-void
-dispatch_async(dispatch_queue_t queue, dispatch_block_t block);
-#endif
-
-/*!
- * @function dispatch_async_f
- *
- * @abstract
- * Submits a function for asynchronous execution on a dispatch queue.
- *
- * @discussion
- * See dispatch_async() for details.
- * 
- * @param queue
- * The target dispatch queue to which the function is submitted.
- * The system will hold a reference on the target queue until the function
- * has returned.
- * The result of passing NULL in this parameter is undefined.
- *
- * @param context
- * The application-defined context parameter to pass to the function.
- *
- * @param work
- * The application-defined function to invoke on the target queue. The first
- * parameter passed to this function is the context provided to
- * dispatch_async_f().
- * The result of passing NULL in this parameter is undefined.
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NONNULL1 DISPATCH_NONNULL3 DISPATCH_NOTHROW
-void
-dispatch_async_f(dispatch_queue_t queue,
-	void *context,
-	dispatch_function_t work);
-
-/*!
- * @function dispatch_sync
- *
- * @abstract
- * Submits a block for synchronous execution on a dispatch queue.
- *
- * @discussion
- * Submits a block to a dispatch queue like dispatch_async(), however
- * dispatch_sync() will not return until the block has finished.
- *
- * Calls to dispatch_sync() targeting the current queue will result
- * in dead-lock. Use of dispatch_sync() is also subject to the same
- * multi-party dead-lock problems that may result from the use of a mutex.
- * Use of dispatch_async() is preferred.
- *
- * Unlike dispatch_async(), no retain is performed on the target queue. Because
- * calls to this function are synchronous, the dispatch_sync() "borrows" the
- * reference of the caller.
- *
- * As an optimization, dispatch_sync() invokes the block on the current
- * thread when possible.
- *
- * @param queue
- * The target dispatch queue to which the block is submitted.
- * The result of passing NULL in this parameter is undefined.
- *
- * @param block
- * The block to be invoked on the target dispatch queue.
- * The result of passing NULL in this parameter is undefined.
- */
-#ifdef __BLOCKS__
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NONNULL_ALL DISPATCH_NOTHROW
-void
-dispatch_sync(dispatch_queue_t queue, dispatch_block_t block);
-#endif
-
-/*!
- * @function dispatch_sync_f
- *
- * @abstract
- * Submits a function for synchronous execution on a dispatch queue.
- *
- * @discussion
- * See dispatch_sync() for details.
- *
- * @param queue
- * The target dispatch queue to which the function is submitted.
- * The result of passing NULL in this parameter is undefined.
- *
- * @param context
- * The application-defined context parameter to pass to the function.
- *
- * @param work
- * The application-defined function to invoke on the target queue. The first
- * parameter passed to this function is the context provided to
- * dispatch_sync_f().
- * The result of passing NULL in this parameter is undefined.
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NONNULL1 DISPATCH_NONNULL3 DISPATCH_NOTHROW
-void
-dispatch_sync_f(dispatch_queue_t queue,
-	void *context,
-	dispatch_function_t work);
-
-/*!
- * @function dispatch_apply
- *
- * @abstract
- * Submits a block to a dispatch queue for multiple invocations.
- *
- * @discussion
- * Submits a block to a dispatch queue for multiple invocations. This function
- * waits for the task block to complete before returning. If the target queue
- * is a concurrent queue returned by dispatch_get_concurrent_queue(), the block
- * may be invoked concurrently, and it must therefore be reentrant safe.
- * 
- * Each invocation of the block will be passed the current index of iteration.
- *
- * @param iterations
- * The number of iterations to perform.
- *
- * @param queue
- * The target dispatch queue to which the block is submitted.
- * The result of passing NULL in this parameter is undefined.
- *
- * @param block
- * The block to be invoked the specified number of iterations.
- * The result of passing NULL in this parameter is undefined.
- */
-#ifdef __BLOCKS__
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NONNULL_ALL DISPATCH_NOTHROW
-void
-dispatch_apply(size_t iterations, dispatch_queue_t queue, void (^block)(size_t));
-#endif
-
-/*!
- * @function dispatch_apply_f
- *
- * @abstract
- * Submits a function to a dispatch queue for multiple invocations.
- *
- * @discussion
- * See dispatch_apply() for details.
- *
- * @param iterations
- * The number of iterations to perform.
- *
- * @param queue
- * The target dispatch queue to which the function is submitted.
- * The result of passing NULL in this parameter is undefined.
- *
- * @param context
- * The application-defined context parameter to pass to the function.
- *
- * @param work
- * The application-defined function to invoke on the target queue. The first
- * parameter passed to this function is the context provided to
- * dispatch_apply_f(). The second parameter passed to this function is the
- * current index of iteration.
- * The result of passing NULL in this parameter is undefined.
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NONNULL2 DISPATCH_NONNULL4 DISPATCH_NOTHROW
-void
-dispatch_apply_f(size_t iterations, dispatch_queue_t queue,
-	void *context,
-	void (*work)(void *, size_t));
-
-/*!
- * @function dispatch_get_current_queue
- *
- * @abstract
- * Returns the queue on which the currently executing block is running.
- * 
- * @discussion
- * Returns the queue on which the currently executing block is running.
- *
- * When dispatch_get_current_queue() is called outside of the context of a
- * submitted block, it will return the default concurrent queue.
- *
- * @result
- * Returns the current queue.
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_PURE DISPATCH_WARN_RESULT DISPATCH_NOTHROW
-dispatch_queue_t
-dispatch_get_current_queue(void);
-
-/*!
- * @function dispatch_get_main_queue
- *
- * @abstract
- * Returns the default queue that is bound to the main thread.
- *
- * @discussion
- * In order to invoke blocks submitted to the main queue, the application must
- * call dispatch_main(), NSApplicationMain(), or use a CFRunLoop on the main
- * thread.
- *
- * @result
- * Returns the main queue. This queue is created automatically on behalf of
- * the main thread before main() is called.
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-extern struct dispatch_queue_s _dispatch_main_q;
-#define dispatch_get_main_queue() (&_dispatch_main_q)
-
-/*!
- * @enum dispatch_queue_priority_t
- *
- * @constant DISPATCH_QUEUE_PRIORITY_HIGH
- * Items dispatched to the queue will run at high priority,
- * i.e. the queue will be scheduled for execution before
- * any default priority or low priority queue.
- *
- * @constant DISPATCH_QUEUE_PRIORITY_DEFAULT
- * Items dispatched to the queue will run at the default
- * priority, i.e. the queue will be scheduled for execution
- * after all high priority queues have been scheduled, but
- * before any low priority queues have been scheduled.
- *
- * @constant DISPATCH_QUEUE_PRIORITY_LOW
- * Items dispatched to the queue will run at low priority,
- * i.e. the queue will be scheduled for execution after all
- * default priority and high priority queues have been
- * scheduled.
- */
-enum {
-	DISPATCH_QUEUE_PRIORITY_HIGH = 2,
-	DISPATCH_QUEUE_PRIORITY_DEFAULT = 0,
-	DISPATCH_QUEUE_PRIORITY_LOW = -2,
-};
-
-/*!
- * @function dispatch_get_global_queue
- *
- * @abstract
- * Returns a well-known global concurrent queue of a given priority level.
- *
- * @discussion
- * The well-known global concurrent queues may not be modified. Calls to
- * dispatch_suspend(), dispatch_resume(), dispatch_set_context(), etc., will
- * have no effect when used with queues returned by this function.
- *
- * @param priority
- * A priority defined in dispatch_queue_priority_t
- *
- * @param flags
- * Reserved for future use. Passing any value other than zero may result in
- * a NULL return value.
- *
- * @result
- * Returns the requested global queue.
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_PURE DISPATCH_WARN_RESULT DISPATCH_NOTHROW
-dispatch_queue_t
-dispatch_get_global_queue(long priority, unsigned long flags);
-
-/*!
- * @function dispatch_queue_create
- *
- * @abstract
- * Creates a new dispatch queue to which blocks may be submitted.
- *
- * @discussion
- * Dispatch queues invoke blocks serially in FIFO order.
- *
- * When the dispatch queue is no longer needed, it should be released
- * with dispatch_release(). Note that any pending blocks submitted
- * to a queue will hold a reference to that queue. Therefore a queue
- * will not be deallocated until all pending blocks have finished.
- *
- * @param label
- * A string label to attach to the queue.
- * This parameter is optional and may be NULL.
- *
- * @param attr
- * Unused. Pass NULL for now.
- *
- * @result
- * The newly created dispatch queue.
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_MALLOC DISPATCH_WARN_RESULT DISPATCH_NOTHROW
-dispatch_queue_t
-dispatch_queue_create(const char *label, dispatch_queue_attr_t attr);
-
-/*!
- * @function dispatch_queue_get_label
- *
- * @abstract
- * Returns the label of the queue that was specified when the
- * queue was created.
- *
- * @param queue
- * The result of passing NULL in this parameter is undefined.
- *
- * @result
- * The label of the queue. The result may be NULL.
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NONNULL_ALL DISPATCH_PURE DISPATCH_WARN_RESULT DISPATCH_NOTHROW
-const char *
-dispatch_queue_get_label(dispatch_queue_t queue);
-
-/*!
- * @function dispatch_set_target_queue
- *
- * @abstract
- * Sets the target queue for the given object.
- *
- * @discussion
- * An object's target queue is responsible for processing the object.
- *
- * A dispatch queue's priority is inherited by its target queue. Use the
- * dispatch_get_global_queue() function to obtain suitable target queue
- * of the desired priority.
- *
- * A dispatch source's target queue specifies where its event handler and
- * cancellation handler blocks will be submitted.
- *
- * The result of calling dispatch_set_target_queue() on any other type of
- * dispatch object is undefined.
- *
- * @param       object
- * The object to modify.
- * The result of passing NULL in this parameter is undefined.
- *
- * @param       queue
- * The new target queue for the object. The queue is retained, and the
- * previous one, if any, is released.
- * The result of passing NULL in this parameter is undefined.
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NONNULL_ALL DISPATCH_NOTHROW
-void
-dispatch_set_target_queue(dispatch_object_t object, dispatch_queue_t queue);
-
-/*!
- * @function dispatch_main
- *
- * @abstract
- * Execute blocks submitted to the main queue.
- *
- * @discussion
- * This function "parks" the main thread and waits for blocks to be submitted
- * to the main queue. This function never returns.
- *
- * Applications that call NSApplicationMain() or CFRunLoopRun() on the
- * main thread do not need to call dispatch_main().
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NOTHROW DISPATCH_NORETURN
-void
-dispatch_main(void);
-
-/*!
- * @function dispatch_after
- *
- * @abstract
- * Schedule a block for execution on a given queue at a specified time.
- *
- * @discussion
- * Passing DISPATCH_TIME_NOW as the "when" parameter is supported, but not as
- * optimal as calling dispatch_async() instead. Passing DISPATCH_TIME_FOREVER
- * is undefined.
- *
- * @param when
- * A temporal milestone returned by dispatch_time() or dispatch_walltime().
- *
- * @param queue
- * A queue to which the given block will be submitted at the specified time.
- * The result of passing NULL in this parameter is undefined.
- *
- * @param block
- * The block of code to execute.
- * The result of passing NULL in this parameter is undefined.
- */
-#ifdef __BLOCKS__
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NONNULL2 DISPATCH_NONNULL3 DISPATCH_NOTHROW
-void
-dispatch_after(dispatch_time_t when,
-	dispatch_queue_t queue,
-	dispatch_block_t block);
-#endif
-
-/*!
- * @function dispatch_after_f
- *
- * @abstract
- * Schedule a function for execution on a given queue at a specified time.
- *
- * @discussion
- * See dispatch_after() for details.
- *
- * @param when
- * A temporal milestone returned by dispatch_time() or dispatch_walltime().
- *
- * @param queue
- * A queue to which the given function will be submitted at the specified time.
- * The result of passing NULL in this parameter is undefined.
- *
- * @param context
- * The application-defined context parameter to pass to the function.
- *
- * @param work
- * The application-defined function to invoke on the target queue. The first
- * parameter passed to this function is the context provided to
- * dispatch_after_f().
- * The result of passing NULL in this parameter is undefined.
- */
-__OSX_AVAILABLE_STARTING(__MAC_10_6,__IPHONE_NA)
-DISPATCH_NONNULL2 DISPATCH_NONNULL4 DISPATCH_NOTHROW
-void
-dispatch_after_f(dispatch_time_t when,
-	dispatch_queue_t queue,
-	void *context,
-	dispatch_function_t work);
-
-__END_DECLS
-
-#endif