namespace simgrid {
namespace simix {
+/** Fulfill a promise by executing a given code */
template<class R, class F>
void fulfill_promise(std::promise<R>& promise, F&& code)
{
try {
- promise.set_value(code());
+ promise.set_value(std::forward<F>(code)());
}
catch(...) {
promise.set_exception(std::current_exception());
}
}
-// special version for R=void because the previous code does not compile
-// in this case:
+/** Fulfill a promise by executing a given code
+ *
+ * This is a special version for `std::promise<void>` because the default
+ * version does not compile in this case.
+ */
template<class F>
void fulfill_promise(std::promise<void>& promise, F&& code)
{
try {
- code();
+ std::forward<F>(code)();
promise.set_value();
}
catch(...) {
}
}
+/** Execute some code in the kernel/maestro
+ *
+ * This can be used to enforce mutual exclusion with other simcall.
+ * More importantly, this enforces a deterministic/reproducible ordering
+ * of the operation with respect to other simcalls.
+ */
template<class F>
typename std::result_of<F()>::type kernel(F&& code)
{
+ // If we are in the maestro, we take the fast path and execute the
+ // code directly without simcall mashalling/unmarshalling/dispatch:
+ if (SIMIX_is_maestro())
+ return std::forward<F>(code)();
+
+ // If we are in the application, pass the code to the maestro which is
+ // executes it for us and reports the result. We use a std::future which
+ // conveniently handles the success/failure value for us.
typedef typename std::result_of<F()>::type R;
std::promise<R> promise;
simcall_run_kernel([&]{
- fulfill_promise(promise, code);
+ xbt_assert(SIMIX_is_maestro(), "Not in maestro");
+ fulfill_promise(promise, std::forward<F>(code));
});
return promise.get_future().get();
}
+class args {
+private:
+ int argc_;
+ char** argv_;
+public:
+
+ // Main constructors
+ args() : argc_(0), argv_(nullptr) {}
+ args(int argc, char** argv) : argc_(argc), argv_(argv) {}
+
+ // Free
+ void clear()
+ {
+ for (int i = 0; i < this->argc_; i++)
+ free(this->argv_[i]);
+ free(this->argv_);
+ this->argc_ = 0;
+ this->argv_ = nullptr;
+ }
+ ~args() { clear(); }
+
+ // Copy
+ args(args const& that) = delete;
+ args& operator=(args const& that) = delete;
+
+ // Move:
+ args(args&& that) : argc_(that.argc_), argv_(that.argv_)
+ {
+ that.argc_ = 0;
+ that.argv_ = nullptr;
+ }
+ args& operator=(args&& that)
+ {
+ this->argc_ = that.argc_;
+ this->argv_ = that.argv_;
+ that.argc_ = 0;
+ that.argv_ = nullptr;
+ return *this;
+ }
+
+ int argc() const { return argc_; }
+ char** argv() { return argv_; }
+ const char*const* argv() const { return argv_; }
+ char* operator[](std::size_t i) { return argv_[i]; }
+};
+
+inline
+std::function<void()> wrap_main(xbt_main_func_t code, int argc, char **argv)
+{
+ if (code) {
+ auto arg = std::make_shared<simgrid::simix::args>(argc, argv);
+ return [=]() {
+ code(arg->argc(), arg->argv());
+ };
+ }
+ // TODO, we should free argv
+ else return std::function<void()>();
+}
+
class Context;
class ContextFactory;
-class ContextFactory {
+XBT_PUBLIC_CLASS ContextFactory {
private:
std::string name_;
public:
virtual ~ContextFactory();
virtual Context* create_context(std::function<void()> code,
void_pfn_smxprocess_t cleanup, smx_process_t process) = 0;
+
+ // Optional methods for attaching main() as a context:
+
+ /** Creates a context from the current context of execution
+ *
+ * This will not work on all implementation of `ContextFactory`.
+ */
+ virtual Context* attach(void_pfn_smxprocess_t cleanup_func, smx_process_t process);
+ virtual Context* create_maestro(std::function<void()> code, smx_process_t process);
+
virtual void run_all() = 0;
virtual Context* self();
std::string const& name() const
}
};
-class Context {
+XBT_PUBLIC_CLASS Context {
private:
std::function<void()> code_;
void_pfn_smxprocess_t cleanup_func_ = nullptr;
virtual void suspend() = 0;
};
+XBT_PUBLIC_CLASS AttachContext : public Context {
+public:
+
+ AttachContext(std::function<void()> code,
+ void_pfn_smxprocess_t cleanup_func,
+ smx_process_t process)
+ : Context(std::move(code), cleanup_func, process)
+ {}
+
+ ~AttachContext();
+
+ /** Called by the context when it is ready to give control
+ * to the maestro.
+ */
+ virtual void attach_start() = 0;
+
+ /** Called by the context when it has finished its job */
+ virtual void attach_stop() = 0;
+};
+
+XBT_PUBLIC(void) set_maestro(std::function<void()> code);
+XBT_PUBLIC(void) create_maestro(std::function<void()> code);
+
}
}
-#endif
\ No newline at end of file
+#endif
