@code{cpp}
template<class T>
template<class F>
-auto simgrid::kernel::Future<T>::thenNoUnwrap(F continuation)
+auto simgrid::kernel::Future<T>::then_no_unwrap(F continuation)
-> Future<decltype(continuation(std::move(*this)))>
{
typedef decltype(continuation(std::move(*this))) R;
`simgrid::simix::unblock(actor)`) when the operation is completed.
This is wrapped in a higher-level primitive as well. The
-`kernelSync()` function expects a function-object which is executed
+`kernel_sync()` function expects a function-object which is executed
immediately in the simulation kernel and returns a `Future<T>`. The
simulator blocks the actor and resumes it when the `Future<T>` becomes
ready with its result:
@code{cpp}
template<class F>
-auto kernelSync(F code) -> decltype(code().get())
+auto kernel_sync(F code) -> decltype(code().get())
{
typedef decltype(code().get()) T;
if (SIMIX_is_maestro())
A contrived example of this would be:
@code{cpp}
-int res = simgrid::simix::kernelSync([&] {
+int res = simgrid::simix::kernel_sync([&] {
return kernel_wait_until(30).then(
[](simgrid::kernel::Future<void> future) {
return 42;
### Asynchronous operations {#uhood_switch_v2_async}
-We can write the related `kernelAsync()` which wakes up the actor immediately
+We can write the related `kernel_async()` which wakes up the actor immediately
and returns a future to the actor. As this future is used in the actor context,
it is a different future
(`simgrid::simix::Future` instead of `simgrid::kernel::Future`)
}
@endcode
-`kernelAsync()` simply :wink: calls `kernelImmediate()` and wraps the
+`kernel_async()` simply :wink: calls `kernelImmediate()` and wraps the
`simgrid::kernel::Future` into a `simgrid::simix::Future`:
@code{cpp}
template<class F>
-auto kernelAsync(F code)
+auto kernel_async(F code)
-> Future<decltype(code().get())>
{
typedef decltype(code().get()) T;
A contrived example of this would be:
@code{cpp}
-simgrid::simix::Future<int> future = simgrid::simix::kernelSync([&] {
+simgrid::simix::Future<int> future = simgrid::simix::kernel_sync([&] {
return kernel_wait_until(30).then(
[](simgrid::kernel::Future<void> future) {
return 42;
int res = future.get();
@endcode
-`kernelSync()` could be rewritten as:
+`kernel_sync()` could be rewritten as:
@code{cpp}
template<class F>
-auto kernelSync(F code) -> decltype(code().get())
+auto kernel_sync(F code) -> decltype(code().get())
{
- return kernelAsync(std::move(code)).get();
+ return kernel_async(std::move(code)).get();
}
@endcode
The semantic is equivalent but this form would require two simcalls
-instead of one to do the same job (one in `kernelAsync()` and one in
+instead of one to do the same job (one in `kernel_async()` and one in
`.get()`).
## Mutexes and condition variables
* the second one is a wait-based (`future.get()`) future used in the actors
which waits using a simcall.
-These futures are used to implement `kernelSync()` and `kernelAsync()` which
+These futures are used to implement `kernel_sync()` and `kernel_async()` which
expose asynchronous operations in the simulation kernel to the actors.
In addition, we wrote variations of some other C++ standard library
@code{cpp}
template<class T>
class Result {
- enum class ResultStatus {
- invalid,
- value,
- exception,
- };
public:
- Result();
- ~Result();
- Result(Result const& that);
- Result& operator=(Result const& that);
- Result(Result&& that);
- Result& operator=(Result&& that);
bool is_valid() const;
- void reset();
void set_exception(std::exception_ptr e);
void set_value(T&& value);
void set_value(T const& value);
T get();
private:
- ResultStatus status_ = ResultStatus::invalid;
- union {
- T value_;
- std::exception_ptr exception_;
- };
+ boost::variant<boost::blank, T, std::exception_ptr> value_;
};
@endcode~
