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01027315f5
This patch moves the gdbsupport directory to the top level. This is the next step in the ongoing project to move gdbserver to the top level. The bulk of this patch was created by "git mv gdb/gdbsupport gdbsupport". This patch then adds a build system to gdbsupport and wires it into the top level. Then it changes gdb to use the top-level build. gdbserver, on the other hand, is not yet changed. It still does its own build of gdbsupport. ChangeLog 2020-01-14 Tom Tromey <tom@tromey.com> * src-release.sh (GDB_SUPPORT_DIRS): Add gdbsupport. * MAINTAINERS: Add gdbsupport. * configure: Rebuild. * configure.ac (configdirs): Add gdbsupport. * gdbsupport: New directory, move from gdb/gdbsupport. * Makefile.def (host_modules, dependencies): Add gnulib. * Makefile.in: Rebuild. gdb/ChangeLog 2020-01-14 Tom Tromey <tom@tromey.com> * nat/x86-linux-dregs.c: Include configh.h. * nat/linux-ptrace.c: Include configh.h. * nat/linux-btrace.c: Include configh.h. * defs.h: Include config.h, bfd.h. * configure.ac: Don't source common.host. (CONFIG_OBS, CONFIG_SRCS): Remove gdbsupport files. * configure: Rebuild. * acinclude.m4: Update path. * Makefile.in (SUPPORT, LIBSUPPORT, INCSUPPORT): New variables. (CONFIG_SRC_SUBDIR): Remove gdbsupport. (INTERNAL_CFLAGS_BASE): Add INCSUPPORT. (CLIBS): Add LIBSUPPORT. (CDEPS): Likewise. (COMMON_SFILES): Remove gdbsupport files. (HFILES_NO_SRCDIR): Likewise. (stamp-version): Update path to create-version.sh. (ALLDEPFILES): Remove gdbsupport files. gdb/gdbserver/ChangeLog 2020-01-14 Tom Tromey <tom@tromey.com> * server.h: Include config.h. * gdbreplay.c: Include config.h. * configure: Rebuild. * configure.ac: Don't source common.host. * acinclude.m4: Update path. * Makefile.in (INCSUPPORT): New variable. (INCLUDE_CFLAGS): Add INCSUPPORT. (SFILES): Update paths. (version-generated.c): Update path to create-version.sh. (gdbsupport/%-ipa.o, gdbsupport/%.o): Update paths. gdbsupport/ChangeLog 2020-01-14 Tom Tromey <tom@tromey.com> * common-defs.h: Add GDBSERVER case. Update includes. * acinclude.m4, aclocal.m4, config.in, configure, configure.ac, Makefile.am, Makefile.in, README: New files. * Moved from ../gdb/gdbsupport/ Change-Id: I07632e7798635c1bab389bf885971e584fb4bb78
87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
/* Parallel for loops
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Copyright (C) 2019-2020 Free Software Foundation, Inc.
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This file is part of GDB.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef GDBSUPPORT_PARALLEL_FOR_H
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#define GDBSUPPORT_PARALLEL_FOR_H
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#include <algorithm>
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#if CXX_STD_THREAD
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#include <thread>
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#include "gdbsupport/thread-pool.h"
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#endif
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namespace gdb
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{
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/* A very simple "parallel for". This splits the range of iterators
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into subranges, and then passes each subrange to the callback. The
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work may or may not be done in separate threads.
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This approach was chosen over having the callback work on single
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items because it makes it simple for the caller to do
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once-per-subrange initialization and destruction. */
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template<class RandomIt, class RangeFunction>
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void
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parallel_for_each (RandomIt first, RandomIt last, RangeFunction callback)
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{
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#if CXX_STD_THREAD
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/* So we can use a local array below. */
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const size_t local_max = 16;
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size_t n_threads = std::min (thread_pool::g_thread_pool->thread_count (),
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local_max);
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size_t n_actual_threads = 0;
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std::future<void> futures[local_max];
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size_t n_elements = last - first;
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if (n_threads > 1)
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{
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/* Arbitrarily require that there should be at least 10 elements
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in a thread. */
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if (n_elements / n_threads < 10)
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n_threads = std::max (n_elements / 10, (size_t) 1);
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size_t elts_per_thread = n_elements / n_threads;
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n_actual_threads = n_threads - 1;
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for (int i = 0; i < n_actual_threads; ++i)
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{
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RandomIt end = first + elts_per_thread;
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auto task = [=] ()
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{
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callback (first, end);
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};
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futures[i] = gdb::thread_pool::g_thread_pool->post_task (task);
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first = end;
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}
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}
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#endif /* CXX_STD_THREAD */
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/* Process all the remaining elements in the main thread. */
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callback (first, last);
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#if CXX_STD_THREAD
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for (int i = 0; i < n_actual_threads; ++i)
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futures[i].wait ();
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#endif /* CXX_STD_THREAD */
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}
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}
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#endif /* GDBSUPPORT_PARALLEL_FOR_H */
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