gdbsupport/task-group.cc

   1 /* Task group
   2
   3    Copyright (C) 2023-2024 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "common-defs.h"
  21 #include "task-group.h"
  22 #include "thread-pool.h"
  23
  24 namespace gdb
  25 {
  26
  27 class task_group::impl : public std::enable_shared_from_this<task_group::impl>
  28 {
  29 public:
  30
  31   explicit impl (std::function<void ()> &&done)
  32     : m_done (std::move (done))
  33   { }
  34   DISABLE_COPY_AND_ASSIGN (impl);
  35
  36   ~impl ()
  37   {
  38     if (m_started)
  39       m_done ();
  40   }
  41
  42   /* Add a task to the task group.  */
  43   void add_task (std::function<void ()> &&task)
  44   {
  45     m_tasks.push_back (std::move (task));
  46   };
  47
  48   /* Start this task group.  */
  49   void start ();
  50
  51   /* True if started.  */
  52   bool m_started = false;
  53   /* The tasks.  */
  54   std::vector<std::function<void ()>> m_tasks;
  55   /* The 'done' function.  */
  56   std::function<void ()> m_done;
  57 };
  58
  59 void
  60 task_group::impl::start ()
  61 {
  62   std::shared_ptr<impl> shared_this = shared_from_this ();
  63   m_started = true;
  64   for (size_t i = 0; i < m_tasks.size (); ++i)
  65     {
  66       gdb::thread_pool::g_thread_pool->post_task ([=] ()
  67       {
  68         /* Be sure to capture a shared reference here.  */
  69         shared_this->m_tasks[i] ();
  70       });
  71     }
  72 }
  73
  74 task_group::task_group (std::function<void ()> &&done)
  75   : m_task (new impl (std::move (done)))
  76 {
  77 }
  78
  79 void
  80 task_group::add_task (std::function<void ()> &&task)
  81 {
  82   gdb_assert (m_task != nullptr);
  83   m_task->add_task (std::move (task));
  84 }
  85
  86 void
  87 task_group::start ()
  88 {
  89   gdb_assert (m_task != nullptr);
  90   m_task->start ();
  91   m_task.reset ();
  92 }
  93
  94 } /* namespace gdb */