Add cancellations (#1055)

* add cancellable awaitables
* add start fork policy
* make RPC use forks

compiler/code-gen/vertex-compiler.cpp

@@ -849,7 +849,7 @@ void compile_func_call(VertexAdaptor<op_func_call> root, CodeGenerator &W, func_
 
     if (mode == func_call_mode::fork_call) {
       if (func->is_interruptible) {
-        W << "(co_await start_fork_and_reschedule_t{" << FunctionName(func);
+        W << "(co_await start_fork_t{" << FunctionName(func);
       } else {
         W << FunctionForkName(func);
       }
@@ -883,7 +883,7 @@ void compile_func_call(VertexAdaptor<op_func_call> root, CodeGenerator &W, func_
   W << ")";
   if (func->is_interruptible) {
     if (mode == func_call_mode::fork_call) {
-      W << "})";
+      W << ", start_fork_t::execution::fork})";
     } else if (func->is_k2_fork) { // k2 fork's return type is 'task_t<fork_result>' so we need to unpack actual result from fork_result
       W << ").get_result<" << TypeName(tinf::get_type(root)) << ">()";
     } else {

runtime-core/utils/hash.h

@@ -0,0 +1,13 @@
+// Compiler for PHP (aka KPHP)
+// Copyright (c) 2024 LLC «V Kontakte»
+// Distributed under the GPL v3 License, see LICENSE.notice.txt
+
+#include <cstddef>
+#include <functional>
+
+// from boost
+// see https://www.boost.org/doc/libs/1_55_0/doc/html/hash/reference.html#boost.hash_combine
+template<typename T>
+void hash_combine(size_t &seed, const T &v) noexcept {
+  seed ^= std::hash<T>{}(v) + 0x9e3779b9 + (seed << 6) + (seed >> 2);
+}