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Commit a38d7d1d by Ben Clayton
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Squashed 'third_party/marl/' changes from ca8408f68..16e1dc37c

16e1dc37c Add missing copyright header to marl-config.cmake.in 09b759550 CMake: link with pthread in a CMake way (#108) 47afda398 Kokoro+ubuntu: enable x86 and clang testing f421c8b4f Kokoro+ubuntu: Plubming for x86 & clang 69797fcf0 Fixes for x86. 3d6365b82 Scheduler: add wait() overloads that do not take a lock db1e8c767 Scheduler: block until all threads are unbound. git-subtree-dir: third_party/marl git-subtree-split: 16e1dc37c5e12c35b93272f0353d0e6e9f200a26
parent 36835bcf
Showing with 515 additions and 271 deletions
CMakeLists.txt
......@@ -105,13 +105,7 @@ endif(NOT MSVC)
###########################################################
# OS libraries
###########################################################
if(CMAKE_SYSTEM_NAME MATCHES "Windows")
set(MARL_OS_LIBS Kernel32)
elseif(CMAKE_SYSTEM_NAME MATCHES "Linux")
set(MARL_OS_LIBS pthread)
elseif(CMAKE_SYSTEM_NAME MATCHES "Darwin")
set(MARL_OS_LIBS)
endif()
find_package(Threads REQUIRED)
###########################################################
# Functions
......@@ -152,7 +146,7 @@ function(marl_set_target_options target)
target_link_libraries(${target} "-fsanitize=thread")
endif()
target_include_directories(${target} PUBLIC ${MARL_INCLUDE_DIR})
target_include_directories(${target} PUBLIC $<BUILD_INTERFACE:${MARL_INCLUDE_DIR}>)
endfunction(marl_set_target_options)
###########################################################
......@@ -167,12 +161,19 @@ set_target_properties(marl PROPERTIES
marl_set_target_options(marl)
target_link_libraries(marl "${MARL_OS_LIBS}")
target_link_libraries(marl PUBLIC Threads::Threads)
# install
if(MARL_INSTALL)
include(CMakePackageConfigHelpers)
include(GNUInstallDirs)
configure_package_config_file(
${CMAKE_CURRENT_SOURCE_DIR}/cmake/marl-config.cmake.in
${CMAKE_CURRENT_BINARY_DIR}/marl-config.cmake
INSTALL_DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/marl
)
install(DIRECTORY ${MARL_INCLUDE_DIR}/marl
DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
USE_SOURCE_PERMISSIONS
......@@ -187,10 +188,14 @@ if(MARL_INSTALL)
)
install(EXPORT marl-targets
FILE marl-config.cmake
FILE marl-targets.cmake
NAMESPACE marl::
DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/marl
)
install(FILES ${CMAKE_CURRENT_BINARY_DIR}/marl-config.cmake
DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/marl
)
endif(MARL_INSTALL)
# tests
......
cmake/marl-config.cmake.in 0 → 100644
# Copyright 2020 The Marl Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# https://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
@PACKAGE_INIT@
include(CMakeFindDependencyMacro)
find_dependency(Threads)
if(NOT TARGET marl::marl)
include(${CMAKE_CURRENT_LIST_DIR}/marl-targets.cmake)
endif()
docs/imgs/worker_run_mtw.svg deleted 100644 → 0
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<metadata> Produced by OmniGraffle 7.12.1
<dc:date>2020-02-12 20:52:25 +0000</dc:date>
</metadata>
<g id="Canvas_1" stroke="none" stroke-opacity="1" fill="none" fill-opacity="1" stroke-dasharray="none">
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<title>join</title>
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<tspan font-family="Courier New" font-size="13" font-weight="700" fill="#515556" x="13.291748" y="11">waitForWork()</tspan>
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<text transform="translate(801 1878)" fill="#515556">
<tspan font-family="Roboto" font-size="12" font-weight="400" fill="#515556" x="29.410156" y="11">Shutdown?</tspan>
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<title>join</title>
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include/marl/blockingcall.h
......@@ -15,7 +15,7 @@
#ifndef marl_blocking_call_h
#define marl_blocking_call_h
#include "defer.h"
#include "scheduler.h"
#include "waitgroup.h"
#include <thread>
......@@ -32,10 +32,17 @@ class OnNewThread {
inline static RETURN_TYPE call(F&& f, Args&&... args) {
RETURN_TYPE result;
WaitGroup wg(1);
auto scheduler = Scheduler::get();
auto thread = std::thread(
[&](Args&&... args) {
defer(wg.done());
[&, wg](Args&&... args) {
if (scheduler != nullptr) {
scheduler->bind();
}
result = f(std::forward<Args>(args)...);
if (scheduler != nullptr) {
Scheduler::unbind();
}
wg.done();
},
std::forward<Args>(args)...);
wg.wait();
......@@ -50,10 +57,17 @@ class OnNewThread<void> {
template <typename F, typename... Args>
inline static void call(F&& f, Args&&... args) {
WaitGroup wg(1);
auto scheduler = Scheduler::get();
auto thread = std::thread(
[&](Args&&... args) {
defer(wg.done());
[&, wg](Args&&... args) {
if (scheduler != nullptr) {
scheduler->bind();
}
f(std::forward<Args>(args)...);
if (scheduler != nullptr) {
Scheduler::unbind();
}
wg.done();
},
std::forward<Args>(args)...);
wg.wait();
......
include/marl/scheduler.h
......@@ -43,7 +43,6 @@ class OSFiber;
// A scheduler can be bound to one or more threads using the bind() method.
// Once bound to a thread, that thread can call marl::schedule() to enqueue
// work tasks to be executed asynchronously.
// All threads must be unbound with unbind() before the scheduler is destructed.
// Scheduler are initially constructed in single-threaded mode.
// Call setWorkerThreadCount() to spawn dedicated worker threads.
class Scheduler {
......@@ -56,8 +55,7 @@ class Scheduler {
Scheduler(Allocator* allocator = Allocator::Default);
// Destructor.
// Ensure that all threads are unbound before calling - failure to do so may
// result in leaked memory.
// Blocks until the scheduler is unbound from all threads before returning.
~Scheduler();
// get() returns the scheduler bound to the current thread.
......@@ -147,6 +145,39 @@ class Scheduler {
const std::chrono::time_point<Clock, Duration>& timeout,
const Predicate& pred);
// wait() suspends execution of this Fiber until the Fiber is woken up with
// a call to notify().
// While the Fiber is suspended, the scheduler thread may continue executing
// other tasks.
// wait() must only be called on the currently executing fiber.
//
// Warning: Unlike wait() overloads that take a lock and predicate, this
// form of wait() offers no safety for notify() signals that occur before
// the fiber is suspended, when signalling between different threads. In
// this scenario you may deadlock. For this reason, it is only ever
// recommended to use this overload if you can guarantee that the calls to
// wait() and notify() are made by the same thread.
//
// Use with extreme caution.
inline void wait();
// wait() suspends execution of this Fiber until the Fiber is woken up with
// a call to notify(), or sometime after the timeout is reached.
// While the Fiber is suspended, the scheduler thread may continue executing
// other tasks.
// wait() must only be called on the currently executing fiber.
//
// Warning: Unlike wait() overloads that take a lock and predicate, this
// form of wait() offers no safety for notify() signals that occur before
// the fiber is suspended, when signalling between different threads. For
// this reason, it is only ever recommended to use this overload if you can
// guarantee that the calls to wait() and notify() are made by the same
// thread.
//
// Use with extreme caution.
template <typename Clock, typename Duration>
inline bool wait(const std::chrono::time_point<Clock, Duration>& timeout);
// notify() reschedules the suspended Fiber for execution.
// notify() is usually only called when the predicate for one or more wait()
// calls will likely return true.
......@@ -283,13 +314,18 @@ class Scheduler {
void stop();
// wait() suspends execution of the current task until the predicate pred
// returns true.
// returns true or the optional timeout is reached.
// See Fiber::wait() for more information.
_Requires_lock_held_(lock)
bool wait(Fiber::Lock& lock,
const TimePoint* timeout,
const Predicate& pred);
// wait() suspends execution of the current task until the fiber is
// notified, or the optional timeout is reached.
// See Fiber::wait() for more information.
bool wait(const TimePoint* timeout);
// suspend() suspends the currenetly executing Fiber until the fiber is
// woken with a call to enqueue(Fiber*), or automatically sometime after the
// optional timeout.
......@@ -314,8 +350,9 @@ class Scheduler {
_Releases_lock_(work.mutex)
void enqueueAndUnlock(Task&& task);
// flush() processes all pending tasks before returning.
void flush();
// runUntilShutdown() processes all tasks and fibers until there are no more
// and shutdown is true, upon runUntilShutdown() returns.
void runUntilShutdown();
// steal() attempts to steal a Task from the worker for another worker.
// Returns true if a task was taken and assigned to out, otherwise false.
......@@ -333,10 +370,7 @@ class Scheduler {
private:
// run() is the task processing function for the worker.
// If the worker was constructed in Mode::MultiThreaded, run() will
// continue to process tasks until stop() is called.
// If the worker was constructed in Mode::SingleThreaded, run() call
// flush() and return.
// run() processes tasks until stop() is called.
_Requires_lock_held_(work.mutex)
void run();
......@@ -377,15 +411,10 @@ class Scheduler {
_Requires_lock_held_(work.mutex)
inline void setFiberState(Fiber* fiber, Fiber::State to) const;
// numBlockedFibers() returns the number of fibers currently blocked and
// held externally.
inline size_t numBlockedFibers() const {
return workerFibers.size() - idleFibers.size();
}
// Work holds tasks and fibers that are enqueued on the Worker.
struct Work {
std::atomic<uint64_t> num = {0}; // tasks.size() + fibers.size()
_Guarded_by_(mutex) uint64_t numBlockedFibers = 0;
_Guarded_by_(mutex) TaskQueue tasks;
_Guarded_by_(mutex) FiberQueue fibers;
_Guarded_by_(mutex) WaitingFibers waiting;
......@@ -454,9 +483,12 @@ class Scheduler {
unsigned int numWorkerThreads = 0;
std::array<Worker*, MaxWorkerThreads> workerThreads;
std::mutex singleThreadedWorkerMutex;
std::unordered_map<std::thread::id, Allocator::unique_ptr<Worker>>
singleThreadedWorkers;
struct SingleThreadedWorkers {
std::mutex mutex;
std::condition_variable unbind;
std::unordered_map<std::thread::id, Allocator::unique_ptr<Worker>> byTid;
};
SingleThreadedWorkers singleThreadedWorkers;
};
_Requires_lock_held_(lock)
......@@ -471,6 +503,19 @@ bool Scheduler::Fiber::wait(
return worker->wait(lock, &tp, pred);
}
void Scheduler::Fiber::wait() {
worker->wait(nullptr);
}
template <typename Clock, typename Duration>
bool Scheduler::Fiber::wait(
const std::chrono::time_point<Clock, Duration>& timeout) {
using ToDuration = typename TimePoint::duration;
using ToClock = typename TimePoint::clock;
auto tp = std::chrono::time_point_cast<ToDuration, ToClock>(timeout);
return worker->wait(&tp);
}
Scheduler::Worker* Scheduler::Worker::getCurrent() {
return Worker::current;
}
......
kokoro/ubuntu/clang-8.pubkey.asc 0 → 100644
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\ No newline at end of file
kokoro/ubuntu/clang-x64/cmake/asan/presubmit.cfg 0 → 100644
# Format: //devtools/kokoro/config/proto/build.proto
# Location of the continuous bash script in Git.
build_file: "marl/kokoro/ubuntu/presubmit.sh"
env_vars {
key: "BUILD_SYSTEM"
value: "cmake"
}
env_vars {
key: "BUILD_TARGET_ARCH"
value: "x64"
}
env_vars {
key: "BUILD_TOOLCHAIN"
value: "clang"
}
env_vars {
key: "BUILD_SANITIZER"
value: "asan"
}
kokoro/ubuntu/clang-x64/cmake/presubmit.cfg 0 → 100644
# Format: //devtools/kokoro/config/proto/build.proto
# Location of the continuous bash script in Git.
build_file: "marl/kokoro/ubuntu/presubmit.sh"
env_vars {
key: "BUILD_SYSTEM"
value: "cmake"
}
env_vars {
key: "BUILD_TARGET_ARCH"
value: "x64"
}
env_vars {
key: "BUILD_TOOLCHAIN"
value: "clang"
}
kokoro/ubuntu/clang-x64/cmake/tsan/presubmit.cfg 0 → 100644
# Format: //devtools/kokoro/config/proto/build.proto
# Location of the continuous bash script in Git.
build_file: "marl/kokoro/ubuntu/presubmit.sh"
env_vars {
key: "BUILD_SYSTEM"
value: "cmake"
}
env_vars {
key: "BUILD_TARGET_ARCH"
value: "x64"
}
env_vars {
key: "BUILD_TOOLCHAIN"
value: "clang"
}
env_vars {
key: "BUILD_SANITIZER"
value: "tsan"
}
kokoro/ubuntu/clang-x86/cmake/presubmit.cfg 0 → 100644
# Format: //devtools/kokoro/config/proto/build.proto
# Location of the continuous bash script in Git.
build_file: "marl/kokoro/ubuntu/presubmit.sh"
env_vars {
key: "BUILD_SYSTEM"
value: "cmake"
}
env_vars {
key: "BUILD_TARGET_ARCH"
value: "x86"
}
env_vars {
key: "BUILD_TOOLCHAIN"
value: "clang"
}
kokoro/ubuntu/gcc-x64/bazel/presubmit.cfg
......@@ -11,4 +11,9 @@ env_vars {
env_vars {
key: "BUILD_TARGET_ARCH"
value: "x64"
}
\ No newline at end of file
}
env_vars {
key: "BUILD_TOOLCHAIN"
value: "gcc"
}
kokoro/ubuntu/gcc-x64/cmake/asan/presubmit.cfg
......@@ -14,6 +14,11 @@ env_vars {
}
env_vars {
key: "BUILD_TOOLCHAIN"
value: "gcc"
}
env_vars {
key: "BUILD_SANITIZER"
value: "asan"
}
kokoro/ubuntu/gcc-x64/cmake/presubmit.cfg
......@@ -12,3 +12,8 @@ env_vars {
key: "BUILD_TARGET_ARCH"
value: "x64"
}
env_vars {
key: "BUILD_TOOLCHAIN"
value: "gcc"
}
kokoro/ubuntu/gcc-x64/cmake/tsan/presubmit.cfg
......@@ -14,6 +14,11 @@ env_vars {
}
env_vars {
key: "BUILD_TOOLCHAIN"
value: "gcc"
}
env_vars {
key: "BUILD_SANITIZER"
value: "tsan"
}
kokoro/ubuntu/gcc-x86/cmake/asan/presubmit.cfg 0 → 100644
# Format: //devtools/kokoro/config/proto/build.proto
# Location of the continuous bash script in Git.
build_file: "marl/kokoro/ubuntu/presubmit.sh"
env_vars {
key: "BUILD_SYSTEM"
value: "cmake"
}
env_vars {
key: "BUILD_TARGET_ARCH"
value: "x86"
}
env_vars {
key: "BUILD_TOOLCHAIN"
value: "gcc"
}
env_vars {
key: "BUILD_SANITIZER"
value: "asan"
}
kokoro/ubuntu/gcc-x86/cmake/presubmit.cfg 0 → 100644
# Format: //devtools/kokoro/config/proto/build.proto
# Location of the continuous bash script in Git.
build_file: "marl/kokoro/ubuntu/presubmit.sh"
env_vars {
key: "BUILD_SYSTEM"
value: "cmake"
}
env_vars {
key: "BUILD_TARGET_ARCH"
value: "x86"
}
env_vars {
key: "BUILD_TOOLCHAIN"
value: "gcc"
}
kokoro/ubuntu/presubmit.sh
......@@ -4,22 +4,68 @@ set -e # Fail on any error.
set -x # Display commands being run.
BUILD_ROOT=$PWD
SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd )"
UBUNTU_VERSION=`cat /etc/os-release | grep -oP "Ubuntu \K([0-9]+\.[0-9]+)"`
cd github/marl
git submodule update --init
# Always update gcc so we get a newer standard library.
sudo add-apt-repository ppa:ubuntu-toolchain-r/test
sudo apt-get update
sudo apt-get install -y gcc-9-multilib g++-9-multilib linux-libc-dev:i386
sudo update-alternatives --install /usr/bin/gcc gcc /usr/bin/gcc-9 100 --slave /usr/bin/g++ g++ /usr/bin/g++-9
sudo update-alternatives --set gcc "/usr/bin/gcc-9"
if [ "$BUILD_SYSTEM" == "cmake" ]; then
mkdir build
cd build
if [ "$BUILD_TOOLCHAIN" == "clang" ]; then
# Download clang tar
CLANG_TAR="/tmp/clang-8.tar.xz"
curl -L "https://releases.llvm.org/8.0.0/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-${UBUNTU_VERSION}.tar.xz" > ${CLANG_TAR}
# Verify clang tar
sudo apt-get install pgpgpg
gpg --import "${SCRIPT_DIR}/clang-8.pubkey.asc"
gpg --verify "${SCRIPT_DIR}/clang-8-ubuntu-${UBUNTU_VERSION}.sig" ${CLANG_TAR}
if [ $? -ne 0 ]; then
echo "clang download failed PGP check"
exit 1
fi
# Untar into tmp
CLANG_DIR=/tmp/clang-8
mkdir ${CLANG_DIR}
tar -xf ${CLANG_TAR} -C ${CLANG_DIR}
# Use clang as compiler
export CC="${CLANG_DIR}/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-${UBUNTU_VERSION}/bin/clang"
export CXX="${CLANG_DIR}/clang+llvm-8.0.0-x86_64-linux-gnu-ubuntu-${UBUNTU_VERSION}/bin/clang++"
fi
extra_cmake_flags=""
if [ "$BUILD_TARGET_ARCH" == "x86" ]; then
extra_cmake_flags="-DCMAKE_CXX_FLAGS=-m32 -DCMAKE_C_FLAGS=-m32 -DCMAKE_ASM_FLAGS=-m32"
fi
build_and_run() {
cmake .. -DMARL_BUILD_EXAMPLES=1 -DMARL_BUILD_TESTS=1 -DMARL_BUILD_BENCHMARKS=1 -DMARL_WARNINGS_AS_ERRORS=1 $1
cmake .. ${extra_cmake_flags} \
-DMARL_BUILD_EXAMPLES=1 \
-DMARL_BUILD_TESTS=1 \
-DMARL_BUILD_BENCHMARKS=1 \
-DMARL_WARNINGS_AS_ERRORS=1 \
$1
make --jobs=$(nproc)
./marl-unittests
./fractal
./hello_task
./primes > /dev/null
./tasks_in_tasks
}
if [ "$BUILD_SANITIZER" == "asan" ]; then
......
src/blockingcall_test.cpp
......@@ -61,3 +61,11 @@ TEST_P(WithBoundScheduler, BlockingCallIntReturn) {
ASSERT_EQ(n.load(), 4950);
}
TEST_P(WithBoundScheduler, BlockingCallSchedulesTask) {
marl::WaitGroup wg(1);
marl::schedule([=] {
marl::blocking_call([=] { marl::schedule([=] { wg.done(); }); });
});
wg.wait();
}
src/osfiber_x86.c
......@@ -25,12 +25,19 @@ void marl_fiber_set_target(struct marl_fiber_context* ctx,
uint32_t stack_size,
void (*target)(void*),
void* arg) {
// The stack pointer needs to be 16-byte aligned when making a 'call'.
// The 'call' instruction automatically pushes the return instruction to the
// stack (4-bytes), before making the jump.
// The marl_fiber_swap() assembly function does not use 'call', instead it
// uses 'jmp', so we need to offset the ESP pointer by 4 bytes so that the
// stack is still 16-byte aligned when the return target is stack-popped by
// the callee.
uintptr_t* stack_top = (uintptr_t*)((uint8_t*)(stack) + stack_size);
ctx->EIP = (uintptr_t)&marl_fiber_trampoline;
ctx->ESP = (uintptr_t)&stack_top[-3];
stack_top[-1] = (uintptr_t)arg;
stack_top[-2] = (uintptr_t)target;
stack_top[-3] = 0; // No return target.
ctx->ESP = (uintptr_t)&stack_top[-5];
stack_top[-3] = (uintptr_t)arg;
stack_top[-4] = (uintptr_t)target;
stack_top[-5] = 0; // No return target.
}
#endif // defined(__i386__)
src/scheduler.cpp
......@@ -99,29 +99,31 @@ void Scheduler::bind() {
MARL_ASSERT(bound == nullptr, "Scheduler already bound");
bound = this;
{
std::unique_lock<std::mutex> lock(singleThreadedWorkerMutex);
std::unique_lock<std::mutex> lock(singleThreadedWorkers.mutex);
auto worker =
allocator->make_unique<Worker>(this, Worker::Mode::SingleThreaded, -1);
worker->start();
auto tid = std::this_thread::get_id();
singleThreadedWorkers.emplace(tid, std::move(worker));
singleThreadedWorkers.byTid.emplace(tid, std::move(worker));
}
}
void Scheduler::unbind() {
MARL_ASSERT(bound != nullptr, "No scheduler bound");
Allocator::unique_ptr<Worker> worker;
auto worker = Scheduler::Worker::getCurrent();
worker->stop();
{
std::unique_lock<std::mutex> lock(bound->singleThreadedWorkerMutex);
std::unique_lock<std::mutex> lock(bound->singleThreadedWorkers.mutex);
auto tid = std::this_thread::get_id();
auto it = bound->singleThreadedWorkers.find(tid);
MARL_ASSERT(it != bound->singleThreadedWorkers.end(),
auto it = bound->singleThreadedWorkers.byTid.find(tid);
MARL_ASSERT(it != bound->singleThreadedWorkers.byTid.end(),
"singleThreadedWorker not found");
worker = std::move(it->second);
bound->singleThreadedWorkers.erase(tid);
MARL_ASSERT(it->second.get() == worker, "worker is not bound?");
bound->singleThreadedWorkers.byTid.erase(it);
if (bound->singleThreadedWorkers.byTid.size() == 0) {
bound->singleThreadedWorkers.unbind.notify_one();
}
}
worker->flush();
worker->stop();
bound = nullptr;
}
......@@ -133,14 +135,12 @@ Scheduler::Scheduler(Allocator* allocator /* = Allocator::Default */)
}
Scheduler::~Scheduler() {
#if MARL_DEBUG_ENABLED
{
std::unique_lock<std::mutex> lock(singleThreadedWorkerMutex);
MARL_ASSERT(singleThreadedWorkers.size() == 0,
"Scheduler still bound on %d threads",
int(singleThreadedWorkers.size()));
// Wait until all the single threaded workers have been unbound.
std::unique_lock<std::mutex> lock(singleThreadedWorkers.mutex);
singleThreadedWorkers.unbind.wait(
lock, [this] { return singleThreadedWorkers.byTid.size() == 0; });
}
#endif // MARL_DEBUG_ENABLED
// Release all worker threads.
// This will wait for all in-flight tasks to complete before returning.
......@@ -211,12 +211,9 @@ void Scheduler::enqueue(Task&& task) {
}
}
} else {
auto tid = std::this_thread::get_id();
std::unique_lock<std::mutex> lock(singleThreadedWorkerMutex);
auto it = singleThreadedWorkers.find(tid);
MARL_ASSERT(it != singleThreadedWorkers.end(),
"singleThreadedWorker not found");
it->second->enqueue(std::move(task));
auto worker = Worker::getCurrent();
MARL_ASSERT(worker, "singleThreadedWorker not found");
worker->enqueue(std::move(task));
}
}
......@@ -398,20 +395,32 @@ void Scheduler::Worker::start() {
void Scheduler::Worker::stop() {
switch (mode) {
case Mode::MultiThreaded:
case Mode::MultiThreaded: {
enqueue(Task([this] { shutdown = true; }, Task::Flags::SameThread));
thread.join();
break;
case Mode::SingleThreaded:
}
case Mode::SingleThreaded: {
std::unique_lock<std::mutex> lock(work.mutex);
shutdown = true;
runUntilShutdown();
Worker::current = nullptr;
break;
}
default:
MARL_ASSERT(false, "Unknown mode: %d", int(mode));
}
}
bool Scheduler::Worker::wait(const TimePoint* timeout) {
DBG_LOG("%d: WAIT(%d)", (int)id, (int)currentFiber->id);
{
std::unique_lock<std::mutex> lock(work.mutex);
suspend(timeout);
}
return timeout == nullptr || std::chrono::system_clock::now() < *timeout;
}
_Requires_lock_held_(waitLock)
bool Scheduler::Worker::wait(Fiber::Lock& waitLock,
const TimePoint* timeout,
......@@ -463,6 +472,8 @@ void Scheduler::Worker::suspend(
// First wait until there's something else this worker can do.
waitForWork();
work.numBlockedFibers++;
if (work.fibers.size() > 0) {
// There's another fiber that has become unblocked, resume that.
work.num--;
......@@ -480,6 +491,8 @@ void Scheduler::Worker::suspend(
switchToFiber(createWorkerFiber());
}
work.numBlockedFibers--;
setFiberState(currentFiber, Fiber::State::Running);
}
......@@ -552,39 +565,24 @@ bool Scheduler::Worker::steal(Task& out) {
}
_Requires_lock_held_(work.mutex)
void Scheduler::Worker::flush() {
MARL_ASSERT(mode == Mode::SingleThreaded,
"flush() can only be used on a single-threaded worker");
std::unique_lock<std::mutex> lock(work.mutex);
runUntilIdle();
void Scheduler::Worker::run() {
if (mode == Mode::MultiThreaded) {
MARL_NAME_THREAD("Thread<%.2d> Fiber<%.2d>", int(id), Fiber::current()->id);
// This is the entry point for a multi-threaded worker.
// Start with a regular condition-variable wait for work. This avoids
// starting the thread with a spinForWork().
work.wait([this] { return work.num > 0 || work.waiting || shutdown; });
}
ASSERT_FIBER_STATE(currentFiber, Fiber::State::Running);
runUntilShutdown();
switchToFiber(mainFiber.get());
}
_Requires_lock_held_(work.mutex)
void Scheduler::Worker::run() {
switch (mode) {
case Mode::MultiThreaded: {
MARL_NAME_THREAD("Thread<%.2d> Fiber<%.2d>", int(id),
Fiber::current()->id);
work.wait([this] { return work.num > 0 || work.waiting || shutdown; });
while (!shutdown || work.num > 0 || numBlockedFibers() > 0U) {
waitForWork();
runUntilIdle();
}
Worker::current = nullptr;
switchToFiber(mainFiber.get());
break;
}
case Mode::SingleThreaded: {
ASSERT_FIBER_STATE(currentFiber, Fiber::State::Running);
while (!shutdown) {
runUntilIdle();
idleFibers.emplace(currentFiber);
switchToFiber(mainFiber.get());
}
break;
}
default:
MARL_ASSERT(false, "Unknown mode: %d", int(mode));
void Scheduler::Worker::runUntilShutdown() {
while (!shutdown || work.num > 0 || work.numBlockedFibers > 0U) {
waitForWork();
runUntilIdle();
}
}
......@@ -604,7 +602,7 @@ void Scheduler::Worker::waitForWork() {
}
work.wait([this] {
return work.num > 0 || (shutdown && numBlockedFibers() == 0U);
return work.num > 0 || (shutdown && work.numBlockedFibers == 0U);
});
if (work.waiting) {
enqueueFiberTimeouts();
......
src/scheduler_test.cpp
......@@ -107,11 +107,14 @@ TEST_P(WithBoundScheduler, FibersResumeOnSameThread) {
TEST_P(WithBoundScheduler, FibersResumeOnSameStdThread) {
auto scheduler = marl::Scheduler::get();
// on 32-bit OSs, excessive numbers of threads can run out of address space.
constexpr auto num_threads = sizeof(void*) > 4 ? 1000 : 100;
marl::WaitGroup fence(1);
marl::WaitGroup wg(1000);
marl::WaitGroup wg(num_threads);
std::vector<std::thread> threads;
for (int i = 0; i < 1000; i++) {
for (int i = 0; i < num_threads; i++) {
threads.push_back(std::thread([=] {
scheduler->bind();
......
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