1 /* Copyright (c) 2009-2020. The SimGrid Team. All rights reserved. */
3 /* This program is free software; you can redistribute it and/or modify it
4 * under the terms of the license (GNU LGPL) which comes with this package. */
6 #ifndef SIMGRID_KERNEL_CONTEXT_SWAPPED_CONTEXT_HPP
7 #define SIMGRID_KERNEL_CONTEXT_SWAPPED_CONTEXT_HPP
9 #include "src/internal_config.h" // HAVE_SANITIZER_*
10 #include "src/kernel/context/Context.hpp"
18 } // namespace context
20 } // namespace simgrid
22 /* Use extern "C" to make sure that this symbol is easy to recognize by name, even on exotic platforms */
23 extern "C" XBT_ATTRIB_NORETURN void smx_ctx_wrapper(simgrid::kernel::context::SwappedContext* context);
29 class SwappedContextFactory : public ContextFactory {
30 friend SwappedContext; // Reads whether we are in parallel mode
32 SwappedContextFactory() = default;
33 SwappedContextFactory(const SwappedContextFactory&) = delete;
34 SwappedContextFactory& operator=(const SwappedContextFactory&) = delete;
35 void run_all() override;
38 /* For the sequential execution */
39 unsigned long process_index_ = 0; // next actor to execute
40 SwappedContext* maestro_context_ = nullptr; // save maestro's context
42 /* For the parallel execution, will be created lazily with the right parameters if needed (ie, in parallel) */
43 std::unique_ptr<simgrid::xbt::Parmap<smx_actor_t>> parmap_{nullptr};
46 class SwappedContext : public Context {
47 friend void ::smx_ctx_wrapper(simgrid::kernel::context::SwappedContext*);
50 SwappedContext(std::function<void()>&& code, smx_actor_t get_actor, SwappedContextFactory* factory);
51 SwappedContext(const SwappedContext&) = delete;
52 SwappedContext& operator=(const SwappedContext&) = delete;
53 virtual ~SwappedContext();
55 void suspend() override;
56 virtual void resume();
57 XBT_ATTRIB_NORETURN void stop() override;
59 void swap_into(SwappedContext* to);
61 unsigned char* get_stack() const { return stack_; }
62 // Return the address for the bottom of the stack. Depending on the stack direction it may be the lower or higher
64 unsigned char* get_stack_bottom() const { return PTH_STACKGROWTH == -1 ? stack_ + smx_context_stack_size : stack_; }
67 // With ASan, after a context switch, check that the originating context is the expected one (see BoostContext)
68 void verify_previous_context(const SwappedContext* context) const;
71 static thread_local SwappedContext* worker_context_;
73 unsigned char* stack_ = nullptr; // the thread stack
74 SwappedContextFactory& factory_; // for sequential and parallel run_all()
77 unsigned int valgrind_stack_id_;
79 #if HAVE_SANITIZER_ADDRESS_FIBER_SUPPORT
80 const void* asan_stack_ = nullptr;
81 size_t asan_stack_size_ = 0;
82 SwappedContext* asan_ctx_ = nullptr;
83 bool asan_stop_ = false;
85 #if HAVE_SANITIZER_THREAD_FIBER_SUPPORT
89 virtual void swap_into_for_real(SwappedContext* to) = 0; // Defined in Raw, Boost and UContext subclasses
92 inline void SwappedContext::verify_previous_context(XBT_ATTRIB_UNUSED const SwappedContext* context) const
94 #if HAVE_SANITIZER_ADDRESS_FIBER_SUPPORT
95 xbt_assert(this->asan_ctx_ == context);
99 } // namespace context
100 } // namespace kernel
101 } // namespace simgrid