1 /* Copyright (c) 2009-2019. 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 /* \file ThreadContext.hpp Context switching with native threads */
8 #ifndef SIMGRID_SIMIX_THREAD_CONTEXT_HPP
9 #define SIMGRID_SIMIX_THREAD_CONTEXT_HPP
11 #include "simgrid/simix.hpp"
12 #include "src/kernel/context/Context.hpp"
13 #include "src/xbt/OsSemaphore.hpp"
14 #include "xbt/xbt_os_thread.h"
22 class XBT_PUBLIC ThreadContext : public AttachContext {
24 ThreadContext(std::function<void()> code, void_pfn_smxprocess_t cleanup_func, smx_actor_t process, bool maestro);
25 ~ThreadContext() override;
27 void suspend() override;
28 void attach_start() override;
29 void attach_stop() override;
31 bool is_maestro() const { return is_maestro_; }
32 void release(); // unblock context's start()
33 void wait(); // wait for context's yield()
36 /** A portable thread */
37 std::thread* thread_ = nullptr;
38 /** Semaphore used to schedule/yield the process (not needed when the maestro is in main, but harmless then) */
39 xbt::OsSemaphore begin_{0};
40 /** Semaphore used to schedule/unschedule (not needed when the maestro is in main, but harmless then) */
41 xbt::OsSemaphore end_{0};
44 void start(); // match a call to release()
45 void yield(); // match a call to yield()
46 virtual void start_hook() { /* empty placeholder, called after start(). Used in parallel mode and Java */}
47 virtual void yield_hook() { /* empty placeholder, called before yield(). Used in parallel mode */}
49 static void* wrapper(void *param);
52 class XBT_PUBLIC SerialThreadContext : public ThreadContext {
54 SerialThreadContext(std::function<void()> code, void_pfn_smxprocess_t cleanup_func, smx_actor_t process, bool maestro)
55 : ThreadContext(std::move(code), cleanup_func, process, maestro)
59 static void run_all();
62 class ParallelThreadContext : public ThreadContext {
64 ParallelThreadContext(std::function<void()> code, void_pfn_smxprocess_t cleanup_func, smx_actor_t process,
66 : ThreadContext(std::move(code), cleanup_func, process, maestro)
70 static void initialize();
71 static void finalize();
72 static void run_all();
75 static xbt::OsSemaphore* thread_sem_;
77 void start_hook() override;
78 void yield_hook() override;
81 class ThreadContextFactory : public ContextFactory {
83 ThreadContextFactory();
84 ~ThreadContextFactory() override;
85 ThreadContext* create_context(std::function<void()> code, void_pfn_smxprocess_t cleanup_func,
86 smx_actor_t process) override
88 bool maestro = not code;
89 return create_context(std::move(code), cleanup_func, process, maestro);
91 void run_all() override;
94 ThreadContext* attach(void_pfn_smxprocess_t cleanup_func, smx_actor_t process) override
96 return create_context(std::function<void()>(), cleanup_func, process, false);
98 ThreadContext* create_maestro(std::function<void()> code, smx_actor_t process) override
100 return create_context(std::move(code), nullptr, process, true);
106 ThreadContext* create_context(std::function<void()> code, void_pfn_smxprocess_t cleanup_func, smx_actor_t process,