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-rw-r--r--src/common/CMakeLists.txt6
-rw-r--r--src/common/thread_group.cpp164
-rw-r--r--src/common/thread_group.h133
-rw-r--r--src/ringct/rctSigs.cpp148
4 files changed, 351 insertions, 100 deletions
diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 4b6149cbd..d5d22bca6 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -32,7 +32,8 @@ set(common_sources
dns_utils.cpp
util.cpp
i18n.cpp
- perf_timer.cpp)
+ perf_timer.cpp
+ thread_group.cpp)
if (STACK_TRACE)
list(APPEND common_sources stack_trace.cpp)
@@ -55,7 +56,8 @@ set(common_private_headers
varint.h
i18n.h
perf_timer.h
- stack_trace.h)
+ stack_trace.h
+ thread_group.h)
monero_private_headers(common
${common_private_headers})
diff --git a/src/common/thread_group.cpp b/src/common/thread_group.cpp
new file mode 100644
index 000000000..ece268ab7
--- /dev/null
+++ b/src/common/thread_group.cpp
@@ -0,0 +1,164 @@
+// Copyright (c) 2014-2016, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+// conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+// of conditions and the following disclaimer in the documentation and/or other
+// materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+// used to endorse or promote products derived from this software without specific
+// prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#include "common/thread_group.h"
+
+#include <cassert>
+#include <limits>
+#include <stdexcept>
+
+#include "common/util.h"
+
+namespace tools
+{
+thread_group::thread_group(std::size_t count) : internal() {
+ static_assert(
+ std::numeric_limits<unsigned>::max() <= std::numeric_limits<std::size_t>::max(),
+ "unexpected truncation"
+ );
+ count = std::min<std::size_t>(count, get_max_concurrency());
+ count = count ? count - 1 : 0;
+
+ if (count) {
+ internal.emplace(count);
+ }
+}
+
+thread_group::data::data(std::size_t count)
+ : threads()
+ , head{nullptr}
+ , last(std::addressof(head))
+ , pending(count)
+ , mutex()
+ , has_work()
+ , finished_work()
+ , stop(false) {
+ threads.reserve(count);
+ while (count--) {
+ threads.push_back(std::thread(&thread_group::data::run, this));
+ }
+}
+
+thread_group::data::~data() noexcept {
+ {
+ const std::unique_lock<std::mutex> lock(mutex);
+ stop = true;
+ }
+ has_work.notify_all();
+ finished_work.notify_all();
+ for (auto& worker : threads) {
+ try {
+ worker.join();
+ }
+ catch(...) {}
+ }
+}
+
+
+void thread_group::data::sync() noexcept {
+ /* This function and `run()` can both throw when acquiring the lock, or in
+ the dispatched function. It is tough to recover from either, particularly the
+ lock case. These functions are marked as noexcept so that if either call
+ throws, the entire process is terminated. Users of the `dispatch` call are
+ expected to make their functions noexcept, or use std::packaged_task to copy
+ exceptions so that the process will continue in all but the most pessimistic
+ cases (std::bad_alloc). This was the existing behavior;
+ `asio::io_service::run` propogates errors from dispatched calls, and uncaught
+ exceptions on threads result in process termination. */
+ assert(!threads.empty());
+ bool not_first = false;
+ while (true) {
+ std::unique_ptr<work> next = nullptr;
+ {
+ std::unique_lock<std::mutex> lock(mutex);
+ pending -= std::size_t(not_first);
+ not_first = true;
+ finished_work.notify_all();
+
+ if (stop) {
+ return;
+ }
+
+ next = get_next();
+ if (next == nullptr) {
+ finished_work.wait(lock, [this] { return pending == 0 || stop; });
+ return;
+ }
+ }
+ assert(next->f);
+ next->f();
+ }
+}
+
+std::unique_ptr<thread_group::data::work> thread_group::data::get_next() noexcept {
+ std::unique_ptr<work> rc = std::move(head.ptr);
+ if (rc != nullptr) {
+ head.ptr = std::move(rc->next.ptr);
+ if (head.ptr == nullptr) {
+ last = std::addressof(head);
+ }
+ }
+ return rc;
+}
+
+void thread_group::data::run() noexcept {
+ // see `sync()` source for additional information
+ while (true) {
+ std::unique_ptr<work> next = nullptr;
+ {
+ std::unique_lock<std::mutex> lock(mutex);
+ --pending;
+ finished_work.notify_all();
+ has_work.wait(lock, [this] { return head.ptr != nullptr || stop; });
+ if (stop) {
+ return;
+ }
+ next = get_next();
+ }
+ assert(next != nullptr);
+ assert(next->f);
+ next->f();
+ }
+}
+
+void thread_group::data::dispatch(std::function<void()> f) {
+ std::unique_ptr<work> latest(new work{std::move(f), node{nullptr}});
+ node* const latest_node = std::addressof(latest->next);
+ {
+ const std::unique_lock<std::mutex> lock(mutex);
+ assert(last != nullptr);
+ assert(last->next == nullptr);
+ if (pending == std::numeric_limits<std::size_t>::max()) {
+ throw std::overflow_error("thread_group exceeded max queue depth");
+ }
+ last->ptr = std::move(latest);
+ last = latest_node;
+ ++pending;
+ }
+ has_work.notify_one();
+}
+}
diff --git a/src/common/thread_group.h b/src/common/thread_group.h
new file mode 100644
index 000000000..d8461d49a
--- /dev/null
+++ b/src/common/thread_group.h
@@ -0,0 +1,133 @@
+// Copyright (c) 2014-2016, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+// conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+// of conditions and the following disclaimer in the documentation and/or other
+// materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+// used to endorse or promote products derived from this software without specific
+// prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#include <boost/optional/optional.hpp>
+#include <condition_variable>
+#include <cstddef>
+#include <functional>
+#include <thread>
+#include <utility>
+#include <vector>
+
+namespace tools
+{
+//! Manages zero or more threads for work dispatching
+class thread_group
+{
+public:
+ //! Create `min(count, get_max_concurrency()) - 1` threads
+ explicit thread_group(std::size_t count);
+
+ thread_group(thread_group const&) = delete;
+ thread_group(thread_group&&) = delete;
+
+ //! Joins threads, but does not necessarily run all dispatched functions.
+ ~thread_group() = default;
+
+ thread_group& operator=(thread_group const&) = delete;
+ thread_group& operator=(thread_group&&) = delete;
+
+ /*! Blocks until all functions provided to `dispatch` complete. Does not
+ destroy threads. If a dispatched function calls `this->dispatch(...)`,
+ `this->sync()` will continue to block until that new function completes. */
+ void sync() noexcept {
+ if (internal) {
+ internal->sync();
+ }
+ }
+
+ /*! Example usage:
+ std::unique_ptr<thread_group, thread_group::lazy_sync> sync(std::addressof(group));
+ which guarantees synchronization before the unique_ptr destructor returns. */
+ struct lazy_sync {
+ void operator()(thread_group* group) const noexcept {
+ if (group != nullptr) {
+ group->sync();
+ }
+ }
+ };
+
+ /*! `f` is invoked immediately if the thread_group is empty, otherwise
+ execution of `f` is queued for next available thread. If `f` is queued, any
+ exception leaving that function will result in process termination. Use
+ std::packaged_task if exceptions need to be handled. */
+ template<typename F>
+ void dispatch(F&& f) {
+ if (internal) {
+ internal->dispatch(std::forward<F>(f));
+ }
+ else {
+ f();
+ }
+ }
+
+private:
+ class data {
+ public:
+ data(std::size_t count);
+ ~data() noexcept;
+
+ void sync() noexcept;
+
+ void dispatch(std::function<void()> f);
+
+ private:
+ struct work;
+
+ struct node {
+ node() = delete;
+ std::unique_ptr<work> ptr;
+ };
+
+ struct work {
+ work() = delete;
+ std::function<void()> f;
+ node next;
+ };
+
+ //! Requires lock on `mutex`.
+ std::unique_ptr<work> get_next() noexcept;
+
+ //! Blocks until destructor is invoked, only call from thread.
+ void run() noexcept;
+
+ private:
+ std::vector<std::thread> threads;
+ node head;
+ node* last;
+ std::size_t pending;
+ std::condition_variable has_work;
+ std::condition_variable finished_work;
+ std::mutex mutex;
+ bool stop;
+ };
+
+private:
+ // optionally construct elements, without separate heap allocation
+ boost::optional<data> internal;
+};
+}
diff --git a/src/ringct/rctSigs.cpp b/src/ringct/rctSigs.cpp
index 19e9d291e..df33c26b2 100644
--- a/src/ringct/rctSigs.cpp
+++ b/src/ringct/rctSigs.cpp
@@ -28,9 +28,9 @@
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-#include <boost/asio.hpp>
#include "misc_log_ex.h"
#include "common/perf_timer.h"
+#include "common/thread_group.h"
#include "common/util.h"
#include "rctSigs.h"
#include "cryptonote_core/cryptonote_format_utils.h"
@@ -38,17 +38,22 @@
using namespace crypto;
using namespace std;
-#define KILL_IOSERVICE() \
- if(ioservice_active) \
- { \
- work.reset(); \
- while (!ioservice.stopped()) ioservice.poll(); \
- threadpool.join_all(); \
- ioservice.stop(); \
- ioservice_active = false; \
+namespace rct {
+ namespace {
+ struct verRangeWrapper_ {
+ void operator()(const key & C, const rangeSig & as, bool &result) const {
+ result = verRange(C, as);
}
+ };
+ constexpr const verRangeWrapper_ verRangeWrapper{};
-namespace rct {
+ struct verRctMGSimpleWrapper_ {
+ void operator()(const key &message, const mgSig &mg, const ctkeyV & pubs, const key & C, bool &result) const {
+ result = verRctMGSimple(message, mg, pubs, C);
+ }
+ };
+ constexpr const verRctMGSimpleWrapper_ verRctMGSimpleWrapper{};
+ }
//Schnorr Non-linkable
//Gen Gives a signature (L1, s1, s2) proving that the sender knows "x" such that xG = one of P1 or P2
@@ -360,10 +365,6 @@ namespace rct {
return true;
}
- void verRangeWrapper(const key & C, const rangeSig & as, bool &result) {
- result = verRange(C, as);
- }
-
key get_pre_mlsag_hash(const rctSig &rv)
{
keyV hashes;
@@ -544,9 +545,6 @@ namespace rct {
return MLSAG_Ver(message, M, mg, rows);
}
- void verRctMGSimpleWrapper(const key &message, const mgSig &mg, const ctkeyV & pubs, const key & C, bool &result) {
- result = verRctMGSimple(message, mg, pubs, C);
- }
//These functions get keys from blockchain
//replace these when connecting blockchain
@@ -767,38 +765,20 @@ namespace rct {
// some rct ops can throw
try
{
- boost::asio::io_service ioservice;
- boost::thread_group threadpool;
- std::unique_ptr<boost::asio::io_service::work> work(new boost::asio::io_service::work(ioservice));
- size_t threads = tools::get_max_concurrency();
- threads = std::min(threads, rv.outPk.size());
- for (size_t i = 0; i < threads; ++i)
- threadpool.create_thread(boost::bind(&boost::asio::io_service::run, &ioservice));
- bool ioservice_active = true;
std::deque<bool> results(rv.outPk.size(), false);
- epee::misc_utils::auto_scope_leave_caller ioservice_killer = epee::misc_utils::create_scope_leave_handler([&]() { KILL_IOSERVICE(); });
+ tools::thread_group threadpool(rv.outPk.size()); // this must destruct before results
DP("range proofs verified?");
for (size_t i = 0; i < rv.outPk.size(); i++) {
- if (threads > 1) {
- ioservice.dispatch(boost::bind(&verRangeWrapper, std::cref(rv.outPk[i].mask), std::cref(rv.p.rangeSigs[i]), std::ref(results[i])));
- }
- else {
- bool tmp = verRange(rv.outPk[i].mask, rv.p.rangeSigs[i]);
- DP(tmp);
- if (!tmp) {
- LOG_ERROR("Range proof verification failed for input " << i);
- return false;
- }
- }
+ threadpool.dispatch(
+ std::bind(verRangeWrapper, std::cref(rv.outPk[i].mask), std::cref(rv.p.rangeSigs[i]), std::ref(results[i]))
+ );
}
- KILL_IOSERVICE();
- if (threads > 1) {
- for (size_t i = 0; i < rv.outPk.size(); ++i) {
- if (!results[i]) {
- LOG_ERROR("Range proof verified failed for input " << i);
- return false;
- }
+ threadpool.sync();
+ for (size_t i = 0; i < rv.outPk.size(); ++i) {
+ if (!results[i]) {
+ LOG_ERROR("Range proof verified failed for input " << i);
+ return false;
}
}
@@ -832,34 +812,23 @@ namespace rct {
CHECK_AND_ASSERT_MES(rv.pseudoOuts.size() == rv.p.MGs.size(), false, "Mismatched sizes of rv.pseudoOuts and rv.p.MGs");
CHECK_AND_ASSERT_MES(rv.pseudoOuts.size() == rv.mixRing.size(), false, "Mismatched sizes of rv.pseudoOuts and mixRing");
+ const size_t threads = std::max(rv.outPk.size(), rv.mixRing.size());
+ tools::thread_group threadpool(threads);
{
- boost::asio::io_service ioservice;
- boost::thread_group threadpool;
- std::unique_ptr<boost::asio::io_service::work> work(new boost::asio::io_service::work(ioservice));
- size_t threads = tools::get_max_concurrency();
- threads = std::min(threads, rv.outPk.size());
- for (size_t i = 0; i < threads; ++i)
- threadpool.create_thread(boost::bind(&boost::asio::io_service::run, &ioservice));
- bool ioservice_active = true;
std::deque<bool> results(rv.outPk.size(), false);
- epee::misc_utils::auto_scope_leave_caller ioservice_killer = epee::misc_utils::create_scope_leave_handler([&]() { KILL_IOSERVICE(); });
-
- for (i = 0; i < rv.outPk.size(); i++) {
- if (threads > 1) {
- ioservice.dispatch(boost::bind(&verRangeWrapper, std::cref(rv.outPk[i].mask), std::cref(rv.p.rangeSigs[i]), std::ref(results[i])));
- }
- else if (!verRange(rv.outPk[i].mask, rv.p.rangeSigs[i])) {
- LOG_ERROR("Range proof verified failed for input " << i);
- return false;
+ {
+ const std::unique_ptr<tools::thread_group, tools::thread_group::lazy_sync>
+ sync(std::addressof(threadpool));
+ for (i = 0; i < rv.outPk.size(); i++) {
+ threadpool.dispatch(
+ std::bind(verRangeWrapper, std::cref(rv.outPk[i].mask), std::cref(rv.p.rangeSigs[i]), std::ref(results[i]))
+ );
}
- }
- KILL_IOSERVICE();
- if (threads > 1) {
- for (size_t i = 0; i < rv.outPk.size(); ++i) {
- if (!results[i]) {
- LOG_ERROR("Range proof verified failed for input " << i);
- return false;
- }
+ } // threadpool.sync();
+ for (size_t i = 0; i < rv.outPk.size(); ++i) {
+ if (!results[i]) {
+ LOG_ERROR("Range proof verified failed for input " << i);
+ return false;
}
}
}
@@ -875,37 +844,20 @@ namespace rct {
key message = get_pre_mlsag_hash(rv);
{
- boost::asio::io_service ioservice;
- boost::thread_group threadpool;
- std::unique_ptr<boost::asio::io_service::work> work(new boost::asio::io_service::work(ioservice));
- size_t threads = tools::get_max_concurrency();
- threads = std::min(threads, rv.mixRing.size());
- for (size_t i = 0; i < threads; ++i)
- threadpool.create_thread(boost::bind(&boost::asio::io_service::run, &ioservice));
- bool ioservice_active = true;
std::deque<bool> results(rv.mixRing.size(), false);
- epee::misc_utils::auto_scope_leave_caller ioservice_killer = epee::misc_utils::create_scope_leave_handler([&]() { KILL_IOSERVICE(); });
-
- for (i = 0 ; i < rv.mixRing.size() ; i++) {
- if (threads > 1) {
- ioservice.dispatch(boost::bind(&verRctMGSimpleWrapper, std::cref(message), std::cref(rv.p.MGs[i]), std::cref(rv.mixRing[i]), std::cref(rv.pseudoOuts[i]), std::ref(results[i])));
+ {
+ const std::unique_ptr<tools::thread_group, tools::thread_group::lazy_sync>
+ sync(std::addressof(threadpool));
+ for (i = 0 ; i < rv.mixRing.size() ; i++) {
+ threadpool.dispatch(
+ std::bind(verRctMGSimpleWrapper, std::cref(message), std::cref(rv.p.MGs[i]), std::cref(rv.mixRing[i]), std::cref(rv.pseudoOuts[i]), std::ref(results[i]))
+ );
}
- else {
- bool tmpb = verRctMGSimple(message, rv.p.MGs[i], rv.mixRing[i], rv.pseudoOuts[i]);
- DP(tmpb);
- if (!tmpb) {
- LOG_ERROR("verRctMGSimple failed for input " << i);
- return false;
- }
- }
- }
- KILL_IOSERVICE();
- if (threads > 1) {
- for (size_t i = 0; i < results.size(); ++i) {
- if (!results[i]) {
- LOG_ERROR("verRctMGSimple failed for input " << i);
- return false;
- }
+ } // threadpool.sync();
+ for (size_t i = 0; i < results.size(); ++i) {
+ if (!results[i]) {
+ LOG_ERROR("verRctMGSimple failed for input " << i);
+ return false;
}
}
}
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