1 //===-- Queue.h ------------------------------------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #ifndef liblldb_Queue_h_
11 #define liblldb_Queue_h_
16 #include "lldb/Target/QueueItem.h"
17 #include "lldb/lldb-enumerations.h"
18 #include "lldb/lldb-forward.h"
19 #include "lldb/lldb-private.h"
21 namespace lldb_private {
23 //------------------------------------------------------------------
25 // This class represents a libdispatch aka Grand Central Dispatch queue in the
28 // A program using libdispatch will create queues, put work items
29 // (functions, blocks) on the queues. The system will create / reassign
30 // pthreads to execute the work items for the queues. A serial queue will be
31 // associated with a single thread (or possibly no thread, if it is not doing
32 // any work). A concurrent queue may be associated with multiple threads.
33 //------------------------------------------------------------------
35 class Queue : public std::enable_shared_from_this<Queue> {
37 Queue(lldb::ProcessSP process_sp, lldb::queue_id_t queue_id,
38 const char *queue_name);
42 //------------------------------------------------------------------
43 /// Get the QueueID for this Queue
45 /// A 64-bit ID number that uniquely identifies a queue at this particular
46 /// stop_id. Currently the libdispatch serialnum is used for the QueueID;
47 /// it is a number that starts at 1 for each process and increments with
48 /// each queue. A serialnum is not reused for a different queue in the
49 /// lifetime of that process execution.
52 /// The QueueID for this Queue.
53 //------------------------------------------------------------------
54 lldb::queue_id_t GetID();
56 //------------------------------------------------------------------
57 /// Get the name of this Queue
60 /// The name of the queue, if one is available.
61 /// A NULL pointer is returned if none is available.
62 //------------------------------------------------------------------
63 const char *GetName();
65 //------------------------------------------------------------------
66 /// Get the IndexID for this Queue
68 /// This is currently the same as GetID(). If it changes in the future,
69 /// it will be a small integer value (starting with 1) assigned to
70 /// each queue that is seen during a Process lifetime.
72 /// Both the GetID and GetIndexID are being retained for Queues to
73 /// maintain similar API to the Thread class, and allow for the
74 /// possibility of GetID changing to a different source in the future.
77 /// The IndexID for this queue.
78 //------------------------------------------------------------------
79 uint32_t GetIndexID();
81 //------------------------------------------------------------------
82 /// Return the threads currently associated with this queue
84 /// Zero, one, or many threads may be executing code for a queue at
85 /// a given point in time. This call returns the list of threads
86 /// that are currently executing work for this queue.
89 /// The threads currently performing work for this queue
90 //------------------------------------------------------------------
91 std::vector<lldb::ThreadSP> GetThreads();
93 //------------------------------------------------------------------
94 /// Return the items that are currently enqueued
96 /// "Enqueued" means that the item has been added to the queue to
97 /// be done, but has not yet been done. When the item is going to
98 /// be processed it is "dequeued".
101 /// The vector of enqueued items for this queue
102 //------------------------------------------------------------------
103 const std::vector<lldb::QueueItemSP> &GetPendingItems();
105 lldb::ProcessSP GetProcess() const { return m_process_wp.lock(); }
107 //------------------------------------------------------------------
108 /// Get the number of work items that this queue is currently running
111 /// The number of work items currently executing. For a serial
112 /// queue, this will be 0 or 1. For a concurrent queue, this
113 /// may be any number.
114 //------------------------------------------------------------------
115 uint32_t GetNumRunningWorkItems() const;
117 //------------------------------------------------------------------
118 /// Get the number of work items enqueued on this queue
121 /// The number of work items currently enqueued, waiting to
123 //------------------------------------------------------------------
124 uint32_t GetNumPendingWorkItems() const;
126 //------------------------------------------------------------------
127 /// Get the dispatch_queue_t structure address for this Queue
129 /// Get the address in the inferior process' memory of this Queue's
130 /// dispatch_queue_t structure.
133 /// The address of the dispatch_queue_t structure, if known.
134 /// LLDB_INVALID_ADDRESS will be returned if it is unavailable.
135 //------------------------------------------------------------------
136 lldb::addr_t GetLibdispatchQueueAddress() const;
138 void SetNumRunningWorkItems(uint32_t count);
140 void SetNumPendingWorkItems(uint32_t count);
142 void SetLibdispatchQueueAddress(lldb::addr_t dispatch_queue_t_addr);
144 void PushPendingQueueItem(lldb::QueueItemSP item) {
145 m_pending_items.push_back(item);
148 //------------------------------------------------------------------
149 /// Return the kind (serial, concurrent) of this queue
152 // Whether this is a serial or a concurrent queue
153 //------------------------------------------------------------------
154 lldb::QueueKind GetKind();
156 void SetKind(lldb::QueueKind kind);
159 //------------------------------------------------------------------
161 //------------------------------------------------------------------
163 lldb::ProcessWP m_process_wp;
164 lldb::queue_id_t m_queue_id;
165 std::string m_queue_name;
166 uint32_t m_running_work_items_count;
167 uint32_t m_pending_work_items_count;
168 std::vector<lldb::QueueItemSP> m_pending_items;
169 lldb::addr_t m_dispatch_queue_t_addr; // address of libdispatch
170 // dispatch_queue_t for this Queue
171 lldb::QueueKind m_kind;
173 DISALLOW_COPY_AND_ASSIGN(Queue);
176 } // namespace lldb_private
178 #endif // liblldb_Queue_h_