1 /* context_java - implementation of context switching for java threads */
3 /* Copyright (c) 2009-2010, 2012-2014. The SimGrid Team.
4 * All rights reserved. */
6 /* This program is free software; you can redistribute it and/or modify it
7 * under the terms of the license (GNU LGPL) which comes with this package. */
12 #include <xbt/function_types.h>
13 #include <simgrid/simix.h>
16 #include "JavaContext.hpp"
17 #include "jxbt_utilities.h"
18 #include "xbt/dynar.h"
19 #include "../../simix/smx_private.h"
21 extern JavaVM *__java_vm;
23 XBT_LOG_NEW_DEFAULT_CATEGORY(jmsg, "MSG for Java(TM)");
28 simgrid::simix::ContextFactory* java_factory()
30 XBT_INFO("Using regular java threads.");
31 return new JavaContextFactory();
34 JavaContextFactory::JavaContextFactory(): ContextFactory("JavaContextFactory")
38 JavaContextFactory::~JavaContextFactory()=default;
40 JavaContext* JavaContextFactory::self()
42 return static_cast<JavaContext*>(xbt_os_thread_get_extra_data());
45 JavaContext* JavaContextFactory::create_context(
46 std::function<void()> code,
47 void_pfn_smxprocess_t cleanup, smx_process_t process)
49 return this->new_context<JavaContext>(std::move(code), cleanup, process);
52 void JavaContextFactory::run_all()
54 xbt_dynar_t processes = SIMIX_process_get_runnable();
55 smx_process_t process;
57 xbt_dynar_foreach(processes, cursor, process) {
58 static_cast<JavaContext*>(SIMIX_process_get_context(process))->resume();
62 JavaContext::JavaContext(std::function<void()> code,
63 void_pfn_smxprocess_t cleanup_func,
64 smx_process_t process)
65 : Context(std::move(code), cleanup_func, process)
67 static int thread_amount=0;
70 /* If the user provided a function for the process then use it otherwise is the context for maestro */
72 this->jprocess = nullptr;
73 this->begin = xbt_os_sem_init(0);
74 this->end = xbt_os_sem_init(0);
77 this->thread = xbt_os_thread_create(
78 nullptr, JavaContext::wrapper, this, nullptr);
82 "Failed to create context #%d. You may want to switch to Java coroutines to increase your limits (error: %s)."
83 "See the Install section of simgrid-java documentation (in doc/install.html) for more on coroutines.",
84 thread_amount, ex.what());
85 xbt_ex new_exception(XBT_THROW_POINT, str);
86 new_exception.category = ex.category;
87 new_exception.value = ex.value;
88 std::throw_with_nested(std::move(new_exception));
91 this->thread = nullptr;
92 xbt_os_thread_set_extra_data(this);
96 JavaContext::~JavaContext()
99 // We are not in maestro context
100 xbt_os_thread_join(this->thread, nullptr);
101 xbt_os_sem_destroy(this->begin);
102 xbt_os_sem_destroy(this->end);
106 void* JavaContext::wrapper(void *data)
108 JavaContext* context = static_cast<JavaContext*>(data);
109 xbt_os_thread_set_extra_data(context);
110 //Attach the thread to the JVM
113 XBT_ATTRIB_UNUSED jint error =
114 __java_vm->AttachCurrentThread((void **)&env, nullptr);
115 xbt_assert((error == JNI_OK), "The thread could not be attached to the JVM");
116 context->jenv = get_current_thread_env();
117 //Wait for the first scheduling round to happen.
118 xbt_os_sem_acquire(context->begin);
119 //Create the "Process" object if needed.
125 void JavaContext::stop()
127 /* I am the current process and I am dying */
128 if (this->iwannadie) {
130 JNIEnv *env = get_current_thread_env();
131 XBT_DEBUG("Gonna launch Killed Error");
132 // TODO Adrien, if the process has not been created at the java layer, why should we raise the exception/error at the java level (this happens
133 // for instance during the migration process that creates at the C level two processes: one on the SRC node and one on the DST node, if the DST process is killed.
134 // it is not required to raise an exception at the JAVA level, the low level should be able to manage such an issue correctly but this is not the case right now unfortunately ...
135 // TODO it will be nice to have the name of the process to help the end-user to know which Process has been killed
136 // jxbt_throw_by_name(env, "org/simgrid/msg/ProcessKilledError", bprintf("Process %s killed :) (file smx_context_java.c)", MSG_process_get_name( (msg_process_t)context) ));
137 jxbt_throw_by_name(env, "org/simgrid/msg/ProcessKilledError",
138 bprintf("Process %s killed :) (file JavaContext.cpp)",
139 this->process()->name.c_str() ));
140 XBT_DEBUG("Trigger a cancel error at the C level");
141 THROWF(cancel_error, 0, "process cancelled");
144 /* detach the thread and kills it */
145 JNIEnv *env = this->jenv;
146 env->DeleteGlobalRef(this->jprocess);
147 XBT_ATTRIB_UNUSED jint error = __java_vm->DetachCurrentThread();
148 xbt_assert((error == JNI_OK), "The thread couldn't be detached.");
149 xbt_os_sem_release(this->end);
150 xbt_os_thread_exit(nullptr);
154 void JavaContext::suspend()
156 xbt_os_sem_release(this->end);
157 xbt_os_sem_acquire(this->begin);
160 // FIXME: inline those functions
161 void JavaContext::resume()
163 xbt_os_sem_release(this->begin);
164 xbt_os_sem_acquire(this->end);