-/* Copyright (c) 2009-2019. The SimGrid Team. All rights reserved. */
+/* Copyright (c) 2009-2023. 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. */
/* \file UContext.cpp Context switching with ucontexts from System V */
-#include "context_private.hpp"
-
#include "mc/mc.h"
#include "simgrid/Exception.hpp"
-#include "src/mc/mc_ignore.hpp"
-#include "src/simix/ActorImpl.hpp"
-#include "src/simix/smx_private.hpp"
+#include "src/kernel/actor/ActorImpl.hpp"
+#include "src/mc/remote/AppSide.hpp"
#include "ContextUnix.hpp"
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(simix_context);
+XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(ker_context);
/** Up to two integers may be needed to store a pointer on the system we target */
constexpr int CTX_ADDR_LEN = 2;
static_assert(sizeof(simgrid::kernel::context::UContext*) <= CTX_ADDR_LEN * sizeof(int),
"Ucontexts are not supported on this arch yet. Please increase CTX_ADDR_LEN.");
-/* Make sure that this symbol is easy to recognize by name, even on exotic platforms */
+// This function is called by makecontext(3): use extern "C" to have C language linkage for its type
extern "C" {
-static void smx_ctx_wrapper(int i1, int i2);
-}
-
-// The name of this function is currently hardcoded in MC (as string).
-// Do not change it without fixing those references as well.
-static void smx_ctx_wrapper(int i1, int i2)
+XBT_ATTRIB_NORETURN static void sysv_ctx_wrapper(int i1, int i2)
{
// Rebuild the Context* pointer from the integers:
int ctx_addr[CTX_ADDR_LEN] = {i1, i2};
simgrid::kernel::context::UContext* context;
memcpy(&context, ctx_addr, sizeof context);
-
- ASAN_FINISH_SWITCH(nullptr, &context->asan_ctx_->asan_stack_, &context->asan_ctx_->asan_stack_size_);
- try {
- (*context)();
- context->Context::stop();
- } catch (simgrid::kernel::context::Context::StopRequest const&) {
- XBT_DEBUG("Caught a StopRequest");
- } catch (simgrid::Exception const& e) {
- XBT_INFO("Actor killed by an uncatched exception %s", simgrid::xbt::demangle(typeid(e).name()).get());
- throw;
- }
- ASAN_ONLY(context->asan_stop_ = true);
- context->suspend();
+ smx_ctx_wrapper(context);
+}
}
-namespace simgrid {
-namespace kernel {
-namespace context {
+namespace simgrid::kernel::context {
// UContextFactory
-Context* UContextFactory::create_context(std::function<void()> code, void_pfn_smxprocess_t cleanup, smx_actor_t actor)
+UContext* UContextFactory::create_context(std::function<void()>&& code, actor::ActorImpl* actor)
{
- return new_context<UContext>(std::move(code), cleanup, actor, this);
+ return new_context<UContext>(std::move(code), actor, this);
}
// UContext
-UContext::UContext(std::function<void()> code, void_pfn_smxprocess_t cleanup_func, smx_actor_t actor,
- SwappedContextFactory* factory)
- : SwappedContext(std::move(code), cleanup_func, actor, factory)
+UContext::UContext(std::function<void()>&& code, actor::ActorImpl* actor, SwappedContextFactory* factory)
+ : SwappedContext(std::move(code), actor, factory)
{
+ XBT_VERB("Creating a context of stack %uMb", actor->get_stacksize() / 1024 / 1024);
/* if the user provided a function for the actor then use it. If not, nothing to do for maestro. */
if (has_code()) {
getcontext(&this->uc_);
this->uc_.uc_link = nullptr;
this->uc_.uc_stack.ss_sp = sg_makecontext_stack_addr(get_stack());
- this->uc_.uc_stack.ss_size = sg_makecontext_stack_size(smx_context_usable_stack_size);
+ this->uc_.uc_stack.ss_size = sg_makecontext_stack_size(actor->get_stacksize());
// Makecontext expects integer arguments; we want to pass a pointer.
- // This context address is decomposed into a serie of integers, which are passed as arguments to makecontext.
+ // This context address is decomposed into a series of integers, which are passed as arguments to makecontext.
int ctx_addr[CTX_ADDR_LEN]{};
UContext* arg = this;
- memcpy(ctx_addr, &arg, sizeof this);
- makecontext(&this->uc_, (void (*)())smx_ctx_wrapper, 2, ctx_addr[0], ctx_addr[1]);
+ memcpy(ctx_addr, &arg, sizeof arg);
+ makecontext(&this->uc_, (void (*)())sysv_ctx_wrapper, 2, ctx_addr[0], ctx_addr[1]);
#if SIMGRID_HAVE_MC
- if (MC_is_active()) {
- MC_register_stack_area(get_stack(), actor, &(this->uc_), smx_context_usable_stack_size);
- }
+ if (MC_is_active())
+ simgrid::mc::AppSide::get()->declare_stack(get_stack(), stack_size, &uc_);
#endif
}
}
-void UContext::swap_into(SwappedContext* to_)
+void UContext::swap_into_for_real(SwappedContext* to_)
{
- UContext* to = static_cast<UContext*>(to_);
- ASAN_ONLY(void* fake_stack = nullptr);
- ASAN_ONLY(to->asan_ctx_ = this);
- ASAN_START_SWITCH(this->asan_stop_ ? nullptr : &fake_stack, to->asan_stack_, to->asan_stack_size_);
+ const UContext* to = static_cast<UContext*>(to_);
swapcontext(&this->uc_, &to->uc_);
- ASAN_FINISH_SWITCH(fake_stack, &this->asan_ctx_->asan_stack_, &this->asan_ctx_->asan_stack_size_);
}
XBT_VERB("Activating SYSV context factory");
return new UContextFactory();
}
-}}} // namespace simgrid::kernel::context
+} // namespace simgrid::kernel::context
