+++ /dev/null
-/* context_cojava - implementation of context switching for java coroutines */
-
-/* Copyright (c) 2012-2014. 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. */
-
-#include <xbt/function_types.h>
-#include <simgrid/simix.h>
-#include <xbt/ex.h>
-#include "smx_context_cojava.h"
-#include "jxbt_utilities.h"
-#include "xbt/dynar.h"
-
-
-//Coroutine methodID/class cache.
-jclass coclass;
-jmethodID coroutine_init;
-jmethodID coroutine_yield;
-jmethodID coroutine_yieldTo;
-jmethodID coroutine_stop;
-//Maestro java coroutine
-jobject cojava_maestro_coroutine;
-
-JNIEnv *global_env;
-
-static smx_context_t my_current_context = NULL;
-static smx_context_t maestro_context = NULL;
-
-
-xbt_dynar_t cojava_processes;
-static unsigned long int cojava_process_index = 0;
-
-extern JavaVM *__java_vm;
-
-XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(jmsg);
-
-
-static smx_context_t
-smx_ctx_cojava_factory_create_context(xbt_main_func_t code,
- int argc, char **argv,
- void_pfn_smxprocess_t cleanup_func,
- smx_process_t process);
-
-static void smx_ctx_cojava_free(smx_context_t context);
-static void smx_ctx_cojava_suspend(smx_context_t context);
-static void smx_ctx_cojava_resume(smx_context_t new_context);
-static void smx_ctx_cojava_runall(void);
-static void* smx_ctx_cojava_run(void *data);
-static void smx_ctx_cojava_create_coroutine(smx_ctx_cojava_t context);
-void SIMIX_ctx_cojava_factory_init(smx_context_factory_t * factory)
-{
- /* instantiate the context factory */
- smx_ctx_base_factory_init(factory);
-
- (*factory)->create_context = smx_ctx_cojava_factory_create_context;
- /* Leave default behavior of (*factory)->finalize */
- (*factory)->free = smx_ctx_cojava_free;
- (*factory)->stop = smx_ctx_cojava_stop;
- (*factory)->suspend = smx_ctx_cojava_suspend;
- (*factory)->runall = smx_ctx_cojava_runall;
- (*factory)->name = "ctx_cojava_factory";
- //(*factory)->finalize = smx_ctx_base_factory_finalize;
- (*factory)->self = smx_ctx_cojava_self;
- (*factory)->get_process = smx_ctx_base_get_process;
-
- global_env = get_current_thread_env();
-
- coclass = (*global_env)->FindClass(global_env, "java/dyn/Coroutine");
- xbt_assert((coclass != NULL), "Can't find java.dyn.Coroutine class.");
- //Cache the method id we are going to use
- coroutine_init = (*global_env)->GetMethodID(global_env, coclass, "<init>", "(Ljava/lang/Runnable;)V");
- xbt_assert((coroutine_init != NULL), "Can't find <init>");
- coroutine_stop = (*global_env)->GetMethodID(global_env, coclass, "stop", "()V");
- xbt_assert((coroutine_stop != NULL), "Method not found...");
- coroutine_yield = (*global_env)->GetStaticMethodID(global_env, coclass, "yield", "()V");
- xbt_assert((coroutine_yield != NULL), "Method yield not found.");
- coroutine_yieldTo = (*global_env)->GetStaticMethodID(global_env, coclass, "yieldTo", "(Ljava/dyn/Coroutine;)V");
- xbt_assert((coroutine_yieldTo != NULL), "Method yieldTo not found.");
-
- jclass class_thread = (*global_env)->FindClass(global_env, "java/lang/Thread");
- xbt_assert((class_thread != NULL), "Can't find java.lang.Thread class");
-
- jclass class_coroutine_support = (*global_env)->FindClass(global_env, "java/dyn/CoroutineSupport");
- xbt_assert((class_coroutine_support != NULL), "Can't find java.dyn.CoroutineSupport class");
- jmethodID thread_get_current = (*global_env)->GetStaticMethodID(global_env, class_thread, "currentThread", "()Ljava/lang/Thread;");
- xbt_assert((thread_get_current != NULL), "Can't find Thread.currentThread() method.");
-
- /**
- * Retrieve maetro coroutine object
- */
- jobject jthread;
- jthread = (*global_env)->CallStaticObjectMethod(global_env, class_thread, thread_get_current);
- xbt_assert((jthread != NULL), "Can't find current thread.");
-
- jmethodID thread_get_coroutine_support = (*global_env)->GetMethodID(global_env, class_thread, "getCoroutineSupport", "()Ljava/dyn/CoroutineSupport;");
- xbt_assert((thread_get_coroutine_support != NULL), "Can't find Thread.getCoroutineSupport method");
-
- jobject jcoroutine_support;
- jcoroutine_support = (*global_env)->CallObjectMethod(global_env, jthread, thread_get_coroutine_support);
- xbt_assert((jcoroutine_support != NULL), "Can't find coroutine support object");
- //FIXME ? Be careful, might change in the implementation (we are relying on private fields, so...).
- jfieldID coroutine_support_thread_coroutine = (*global_env)->GetFieldID(global_env, class_coroutine_support, "threadCoroutine", "Ljava/dyn/Coroutine;");
- xbt_assert((coroutine_support_thread_coroutine != NULL), "Can't find threadCoroutine field");
- cojava_maestro_coroutine = (jobject)(*global_env)->GetObjectField(global_env, jcoroutine_support, coroutine_support_thread_coroutine);
- xbt_assert((cojava_maestro_coroutine != NULL), "Can't find the thread coroutine.");
- cojava_maestro_coroutine = (*global_env)->NewGlobalRef(global_env, cojava_maestro_coroutine);
- xbt_assert((cojava_maestro_coroutine != NULL), "Can't get a global reference to the thread coroutine.");
-}
-smx_context_t smx_ctx_cojava_self(void)
-{
- return my_current_context;
-}
-
-static smx_context_t
-smx_ctx_cojava_factory_create_context(xbt_main_func_t code,
- int argc, char **argv,
- void_pfn_smxprocess_t cleanup_func,
- smx_process_t process)
-{
- smx_ctx_cojava_t context = xbt_new0(s_smx_ctx_cojava_t, 1);
- /* If the user provided a function for the process then use it
- otherwise is the context for maestro */
- if (code) {
- if (argc == 0) {
- context->jprocess = (jobject) code;
- }
- else {
- context->jprocess = NULL;
- }
- context->super.cleanup_func = cleanup_func;
-
- context->super.argc = argc;
- context->super.argv = argv;
- context->super.code = code;
-
- smx_ctx_cojava_run(context);
- }
- else {
- context->jcoroutine = NULL;
- my_current_context = (smx_context_t)context;
- maestro_context = (smx_context_t)context;
- }
- context->bound = 0;
- context->super.process = process;
- return (smx_context_t) context;
-}
-
-static void* smx_ctx_cojava_run(void *data) {
- smx_ctx_cojava_t context = (smx_ctx_cojava_t)data;
- my_current_context = (smx_context_t)context;
- //Create the "Process" object if needed.
- if (context->super.argc <= 0) {
- smx_ctx_cojava_create_coroutine(context);
- }
- my_current_context = maestro_context;
- return NULL;
-}
-static void smx_ctx_cojava_free(smx_context_t context)
-{
- if (context) {
- smx_ctx_cojava_t ctx_java = (smx_ctx_cojava_t) context;
- if (ctx_java->jcoroutine) { /* We are not in maestro context */
- JNIEnv *env = get_current_thread_env();
- (*env)->DeleteGlobalRef(env, ctx_java->jcoroutine);
- (*env)->DeleteGlobalRef(env, ctx_java->jprocess);
- }
- }
- smx_ctx_base_free(context);
-}
-
-
-void smx_ctx_cojava_stop(smx_context_t context)
-{
- /*
- * The java stack needs to be empty, otherwise weird stuff
- * will happen
- */
- if (context->iwannadie) {
- context->iwannadie = 0;
- JNIEnv *env = get_current_thread_env();
- // TODO it will be nice to have the name of the process to help the end-user to know which Process has been killed
- jxbt_throw_by_name(env, "org/simgrid/msg/ProcessKilledError", xbt_strdup("Process killed :) (file smx_context_cojava.c)"));
- THROWF(cancel_error, 0, "process cancelled");
- }
- else {
- smx_ctx_base_stop(context);
- smx_ctx_cojava_suspend(context);
- }
-}
-
-static void smx_ctx_cojava_suspend(smx_context_t context)
-{
- smx_context_t previous_context = context;
- unsigned long int i = cojava_process_index++;
- jobject next_coroutine;
-
- if (i < xbt_dynar_length(cojava_processes)) {
- smx_context_t next_context = SIMIX_process_get_context(xbt_dynar_get_as(
- cojava_processes,i, smx_process_t));
- my_current_context = next_context;
- XBT_DEBUG("Switching to %p",my_current_context);
- smx_ctx_cojava_t java_context = (smx_ctx_cojava_t)(next_context);
- if (!java_context->jprocess) {
- java_context->super.code(java_context->super.argc, java_context->super.argv);
- smx_ctx_cojava_create_coroutine(java_context);
- }
- else if (!java_context->bound) {
- java_context->bound = 1;
- smx_process_t process = SIMIX_process_self();
- (*global_env)->SetLongField(global_env, java_context->jprocess,
- jprocess_field_Process_bind,
- (intptr_t)process);
- }
-
- next_coroutine = java_context->jcoroutine;
- }
- else {
- //Give maestro the control back.
- next_coroutine = cojava_maestro_coroutine;
- my_current_context = maestro_context;
- }
- (*global_env)->CallStaticVoidMethod(global_env, coclass, coroutine_yieldTo, next_coroutine);
- my_current_context = previous_context;
-}
-
-static void smx_ctx_cojava_resume(smx_context_t new_context) {
- my_current_context = new_context;
- smx_ctx_cojava_t java_context = (smx_ctx_cojava_t)(new_context);
-
- if (!java_context->jprocess) {
- java_context->super.code(java_context->super.argc, java_context->super.argv);
- smx_ctx_cojava_create_coroutine(java_context);
- java_context->bound = 1;
- }
- else if (!java_context->bound) {
- java_context->bound = 1;
- smx_process_t process = SIMIX_process_self();
- (*global_env)->SetLongField(global_env, java_context->jprocess,
- jprocess_field_Process_bind, (intptr_t)process);
- }
- (*global_env)->CallStaticVoidMethod(global_env, coclass, coroutine_yieldTo, java_context->jcoroutine);
-}
-
-static void smx_ctx_cojava_runall(void)
-{
- cojava_processes = SIMIX_process_get_runnable();
- smx_process_t process;
- if (!xbt_dynar_is_empty(cojava_processes)) {
- process = xbt_dynar_get_as(cojava_processes, 0, smx_process_t);
- cojava_process_index = 1;
- /* Execute the first process */
- smx_ctx_cojava_resume(SIMIX_process_get_context(process));
- }
-}
-
-static void smx_ctx_cojava_create_coroutine(smx_ctx_cojava_t context) {
- JNIEnv *env = get_current_thread_env();
- jclass coclass = (*env)->FindClass(env, "java/dyn/Coroutine");
- xbt_assert((coclass != NULL), "Can't find coroutine class ! :(");
- jobject jcoroutine = (*env)->NewObject(env, coclass, coroutine_init, context->jprocess);
- if (jcoroutine == NULL) {
- FILE *conf= fopen("/proc/sys/vm/max_map_count","r");
- if (conf) {
- int limit=-1;
- if(fscanf(conf,"%d",&limit) != 1)
- xbt_die("Error while creating a new coroutine. Parse error.");
- fclose(conf);
- if (limit!=-1 && SIMIX_process_count() > (limit - 100) /2)
- xbt_die("Error while creating a new coroutine. "
- "This seem due to the the vm.max_map_count system limit that is only equal to %d while we already have %d coroutines. "
- "Please check the install documentation to see how to increase this limit", limit, SIMIX_process_count());
- if (limit == -1)
- xbt_die("Error while creating a new coroutine. "
- "This seems to be a non-linux system, disabling the automatic verification that the system limit on the amount of memory maps is high enough.");
- xbt_die("Error while creating a new coroutine. ");
- }
-
- }
-
- jcoroutine = (*env)->NewGlobalRef(env, jcoroutine);
- context->jcoroutine = jcoroutine;
-}
