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/* Copyright (c) 2008-2022 the MRtrix3 contributors.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* Covered Software is provided under this License on an "as is"
* basis, without warranty of any kind, either expressed, implied, or
* statutory, including, without limitation, warranties that the
* Covered Software is free of defects, merchantable, fit for a
* particular purpose or non-infringing.
* See the Mozilla Public License v. 2.0 for more details.
*
* For more details, see http://www.mrtrix.org/.
*/
#include <thread>
#include <atomic>
#include "app.h"
#include "thread.h"
#include "file/config.h"
#include "thread_queue.h"
namespace MR
{
namespace Thread
{
namespace {
size_t __number_of_threads = 0;
nthreads_t __nthreads_type = nthreads_t::UNINITIALISED;
}
size_t number_of_threads ()
{
if (__nthreads_type != nthreads_t::UNINITIALISED)
return __number_of_threads;
auto opt = App::get_options ("nthreads");
if (opt.size()) {
__number_of_threads = opt[0][0];
__nthreads_type = nthreads_t::EXPLICIT;
return __number_of_threads;
}
//ENVVAR name: MRTRIX_NTHREADS
//ENVVAR set the number of threads that MRtrix3 applications should use.
//ENVVAR This overrides the automatically determined number, or the
//ENVVAR :option:`NumberOfThreads` setting in the configuration file, but
//ENVVAR will be overridden by the ENVVAR ``-nthreads`` command-line option.
const char* from_env = getenv ("MRTRIX_NTHREADS");
if (from_env) {
__number_of_threads = to<size_t> (from_env);
__nthreads_type = nthreads_t::EXPLICIT;
return __number_of_threads;
}
//CONF option: NumberOfThreads
//CONF default: number of threads provided by hardware
//CONF Set the default number of CPU threads to use for multi-threading.
if (File::Config::get ("NumberOfThreads").size()) {
const int i = File::Config::get_int ("NumberOfThreads", -1);
if (i >= 0) {
__number_of_threads = i;
__nthreads_type = nthreads_t::EXPLICIT;
return __number_of_threads;
}
}
__number_of_threads = std::thread::hardware_concurrency();
__nthreads_type = nthreads_t::IMPLICIT;
return __number_of_threads;
}
nthreads_t type_nthreads()
{
return __nthreads_type;
}
size_t threads_to_execute()
{
return (__Backend::valid() ? 0 : number_of_threads());
}
void (*__Backend::previous_print_func) (const std::string& msg) = nullptr;
void (*__Backend::previous_report_to_user_func) (const std::string& msg, int type) = nullptr;
__Backend::__Backend () :
refcount (0) {
DEBUG ("initialising threads...");
std::atomic<uint8_t> a;
if (!a.is_lock_free())
WARN ("atomic operations on uint8_t are not lock-free - this may introduce instabilities in operation!");
if (sizeof (a) != sizeof (uint8_t))
WARN ("size of atomic<uint8_t> differs from that of uint8_t - this may introduce instabilities in operation!");
previous_print_func = print;
previous_report_to_user_func = report_to_user_func;
print = thread_print_func;
report_to_user_func = thread_report_to_user_func;
}
__Backend::~__Backend ()
{
print = previous_print_func;
report_to_user_func = previous_report_to_user_func;
}
void __Backend::thread_print_func (const std::string& msg)
{
std::lock_guard<std::mutex> lock (mutex);
previous_print_func (msg);
}
void __Backend::thread_report_to_user_func (const std::string& msg, int type)
{
std::lock_guard<std::mutex> lock (mutex);
previous_report_to_user_func (msg, type);
}
__Backend* __Backend::backend = nullptr;
std::mutex __Backend::mutex;
}
}
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