1 /* Context switching within the JVM. */
3 /* Copyright (c) 2009-2019. The SimGrid Team. All rights reserved. */
5 /* This program is free software; you can redistribute it and/or modify it
6 * under the terms of the license (GNU LGPL) which comes with this package. */
8 #include "JavaContext.hpp"
9 #include "jxbt_utilities.hpp"
10 #include "simgrid/Exception.hpp"
11 #include "src/simix/smx_private.hpp"
16 extern JavaVM* __java_vm;
18 XBT_LOG_NEW_DEFAULT_CATEGORY(java, "MSG for Java(TM)");
24 ContextFactory* java_factory()
26 XBT_INFO("Using regular java threads.");
27 return new JavaContextFactory();
30 JavaContextFactory::JavaContextFactory() : ContextFactory()
32 xbt_binary_name = xbt_strdup("java"); // Used by the backtrace displayer
35 JavaContextFactory::~JavaContextFactory()=default;
37 JavaContext* JavaContextFactory::create_context(std::function<void()> code, void_pfn_smxprocess_t cleanup_fun,
40 return this->new_context<JavaContext>(std::move(code), cleanup_fun, actor);
43 void JavaContextFactory::run_all()
45 SerialThreadContext::run_all();
48 JavaContext::JavaContext(std::function<void()> code, void_pfn_smxprocess_t cleanup_func, smx_actor_t process)
49 : SerialThreadContext(std::move(code), cleanup_func, process, false /* not maestro */)
51 /* ThreadContext already does all we need */
54 void JavaContext::start_hook()
56 Context::set_current(this); // We need to attach it also for maestro, in contrary to our ancestor
58 //Attach the thread to the JVM
60 XBT_ATTRIB_UNUSED jint error = __java_vm->AttachCurrentThread((void**)&env, nullptr);
61 xbt_assert((error == JNI_OK), "The thread could not be attached to the JVM");
65 void JavaContext::stop_hook()
67 JNIEnv* env = this->jenv_;
68 env->DeleteGlobalRef(this->jprocess_);
69 XBT_ATTRIB_UNUSED jint error = __java_vm->DetachCurrentThread();
70 if (error != JNI_OK) {
71 /* This is probably a Java thread, ie an actor not created from the XML (and thus from the C++),
72 * but from Java with something like new Process().start().
74 * We should not even try to detach such threads. Instead, we throw a Java exception that will raise up
75 * until run_jprocess(), IIUC.
77 jxbt_throw_by_name(env, "org/simgrid/msg/ProcessKilledError", "Process killed");
78 XBT_DEBUG("Cannot detach the current thread");
82 }}} // namespace simgrid::kernel::context