+++ /dev/null
-/* Copyright (c) 2016. The SimGrid Team.
- * All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-#ifndef SIMGRID_SIMIX_BLOCKING_SIMCALL_HPP
-#define SIMGRID_SIMIX_BLOCKING_SIMCALL_HPP
-
-#include <exception>
-#include <functional>
-#include <future>
-#include <utility>
-
-#include <xbt/sysdep.h>
-
-#include <xbt/future.hpp>
-#include <simgrid/kernel/future.hpp>
-#include <simgrid/simix.h>
-#include <simgrid/simix.hpp>
-
-XBT_PUBLIC(void) simcall_run_blocking(std::function<void()> const& code);
-
-namespace simgrid {
-namespace simix {
-
-XBT_PUBLIC(void) unblock(smx_process_t process);
-
-/** Execute some code in kernel mode and wakes up the process when
- * the result is available.
- *
- * It is given a callback which is executed in the kernel SimGrid and
- * returns a simgrid::kernel::Future<T>. The kernel blocks the process
- * until the Future is ready and either the value wrapped in the future
- * to the process or raises the exception stored in the Future in the process.
- *
- * This can be used to implement blocking calls without adding new simcalls.
- * One downside of this approach is that we don't have any semantic on what
- * the process is waiting. This might be a problem for the model-checker and
- * we'll have to devise a way to make it work.
- *
- * @param code Kernel code returning a `simgrid::kernel::Future<T>`
- * @return Value of the kernel future
- * @exception Exception from the kernel future
- */
-template<class F>
-auto kernelSync(F code) -> decltype(code().get())
-{
- typedef decltype(code().get()) T;
- if (SIMIX_is_maestro())
- xbt_die("Can't execute blocking call in kernel mode");
-
- smx_process_t self = SIMIX_process_self();
- simgrid::xbt::Result<T> result;
-
- simcall_run_blocking([&result, self, &code]{
- try {
- auto future = code();
- future.then_([&result, self](simgrid::kernel::Future<T> value) {
- simgrid::xbt::setPromise(result, value);
- simgrid::simix::unblock(self);
- });
- }
- catch (...) {
- result.set_exception(std::current_exception());
- simgrid::simix::unblock(self);
- }
- });
- return result.get();
-}
-
-/** A blocking (`wait()`-based) future for SIMIX processes */
-// TODO, .wait_for()
-// TODO, .wait_until()
-// TODO, SharedFuture
-// TODO, simgrid::simix::when_all - wait for all future to be ready (this one is simple!)
-// TODO, simgrid::simix::when_any - wait for any future to be ready
-template <class T>
-class Future {
-public:
- Future() {}
- Future(simgrid::kernel::Future<T> future) : future_(std::move(future)) {}
-
- bool valid() const { return future_.valid(); }
- T get()
- {
- if (!valid())
- throw std::future_error(std::future_errc::no_state);
- smx_process_t self = SIMIX_process_self();
- simgrid::xbt::Result<T> result;
- simcall_run_blocking([this, &result, self]{
- try {
- // When the kernel future is ready...
- this->future_.then_([this, &result, self](simgrid::kernel::Future<T> value) {
- // ... wake up the process with the result of the kernel future.
- simgrid::xbt::setPromise(result, value);
- simgrid::simix::unblock(self);
- });
- }
- catch (...) {
- result.set_exception(std::current_exception());
- simgrid::simix::unblock(self);
- }
- });
- return result.get();
- }
- bool is_ready() const
- {
- if (!valid())
- throw std::future_error(std::future_errc::no_state);
- return future_.is_ready();
- }
- void wait()
- {
- // The future is ready! We don't have to wait:
- if (this->is_ready())
- return;
- // The future is not ready. We have to delegate to the SimGrid kernel:
- std::exception_ptr exception;
- smx_process_t self = SIMIX_process_self();
- simcall_run_blocking([this, &exception, self]{
- try {
- // When the kernel future is ready...
- this->future_.then_([this, self](simgrid::kernel::Future<T> value) {
- // ...store it the simix kernel and wake up.
- this->future_ = std::move(value);
- simgrid::simix::unblock(self);
- });
- }
- catch (...) {
- exception = std::current_exception();
- simgrid::simix::unblock(self);
- }
- });
- }
-private:
- // We wrap an event-based kernel future:
- simgrid::kernel::Future<T> future_;
-};
-
-/** Start some asynchronous work
- *
- * @param code SimGrid kernel code which returns a simgrid::kernel::Future
- * @return User future
- */
-template<class F>
-auto kernelAsync(F code)
- -> Future<decltype(code().get())>
-{
- typedef decltype(code().get()) T;
-
- // Execute the code in the kernel and get the kernel simcall:
- simgrid::kernel::Future<T> future =
- simgrid::simix::kernelImmediate(std::move(code));
-
- // Wrap tyhe kernel simcall in a user simcall:
- return simgrid::simix::Future<T>(std::move(future));
-}
-
-}
-}
-
-#endif
