1 /* context_java - implementation of context switching for java threads */
3 /* Copyright (c) 2009, 2010. 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. */
10 #include <xbt/function_types.h>
11 #include <simgrid/simix.h>
13 #include "smx_context_java.h"
14 #include "jxbt_utilities.h"
15 #include "xbt/dynar.h"
16 JavaVM *get_current_vm(void);
17 JavaVM *get_current_vm(void)
20 JNI_GetCreatedJavaVMs(&jvm,1,NULL);
26 XBT_LOG_NEW_DEFAULT_SUBCATEGORY(jmsg, bindings, "MSG for Java(TM)");
29 smx_ctx_java_factory_create_context(xbt_main_func_t code, int argc,
31 void_pfn_smxprocess_t cleanup_func,
34 static void smx_ctx_java_free(smx_context_t context);
35 static void smx_ctx_java_start(smx_context_t context);
36 static void smx_ctx_java_suspend(smx_context_t context);
37 static void smx_ctx_java_resume(smx_context_t new_context);
38 static void smx_ctx_java_runall(void);
39 static void* smx_ctx_java_thread_run(void *data);
40 void SIMIX_ctx_java_factory_init(smx_context_factory_t * factory)
42 /* instantiate the context factory */
43 smx_ctx_base_factory_init(factory);
45 (*factory)->create_context = smx_ctx_java_factory_create_context;
46 /* Leave default behavior of (*factory)->finalize */
47 (*factory)->free = smx_ctx_java_free;
48 (*factory)->stop = smx_ctx_java_stop;
49 (*factory)->suspend = smx_ctx_java_suspend;
50 (*factory)->runall = smx_ctx_java_runall;
51 (*factory)->name = "ctx_java_factory";
52 //(*factory)->finalize = smx_ctx_base_factory_finalize;
53 (*factory)->self = smx_ctx_java_self;
54 (*factory)->get_data = smx_ctx_base_get_data;
56 smx_context_t smx_ctx_java_self(void)
58 return (smx_context_t)xbt_os_thread_get_extra_data();
62 smx_ctx_java_factory_create_context(xbt_main_func_t code, int argc,
64 void_pfn_smxprocess_t cleanup_func,
67 smx_ctx_java_t context = xbt_new0(s_smx_ctx_java_t, 1);
68 /* If the user provided a function for the process then use it
69 otherwise is the context for maestro */
72 context->jprocess = (jobject) code;
75 context->jprocess = NULL;
77 context->super.cleanup_func = cleanup_func;
78 context->begin = xbt_os_sem_init(0);
79 context->end = xbt_os_sem_init(0);
81 context->super.argc = argc;
82 context->super.argv = argv;
83 context->super.code = code;
85 context->thread = xbt_os_thread_create(NULL,smx_ctx_java_thread_run,context,NULL);
88 context->thread = NULL;
89 xbt_os_thread_set_extra_data(context);
91 context->super.data = data;
93 return (smx_context_t) context;
96 static void* smx_ctx_java_thread_run(void *data) {
97 smx_ctx_java_t context = (smx_ctx_java_t)data;
98 xbt_os_thread_set_extra_data(context);
99 //Attach the thread to the JVM
101 JavaVM *jvm = get_current_vm();
102 jint error = (*jvm)->AttachCurrentThread(jvm, (void **) &env, NULL);
103 xbt_assert((error == JNI_OK), "The thread could not be attached to the JVM");
104 context->jenv = get_current_thread_env();
105 //Wait for the first scheduling round to happen.
106 xbt_os_sem_acquire(context->begin);
107 //Create the "Process" object if needed.
108 if (context->super.argc > 0) {
109 (*(context->super.code))(context->super.argc, context->super.argv);
111 xbt_assert((context->jprocess != NULL), "Process not created...");
112 //wait for the process to be able to begin
114 jfieldID jprocess_field_Process_startTime = jxbt_get_sfield(env, "org/simgrid/msg/Process", "startTime", "D");
115 jdouble startTime = (*env)->GetDoubleField(env, context->jprocess, jprocess_field_Process_startTime);
116 if (startTime > MSG_get_clock()) {
117 MSG_process_sleep(startTime - MSG_get_clock());
119 //Execution of the "run" method.
120 jmethodID id = jxbt_get_smethod(env, "org/simgrid/msg/Process", "run", "()V");
121 xbt_assert( (id != NULL), "Method not found...");
122 (*env)->CallVoidMethod(env, context->jprocess, id);
123 smx_ctx_java_stop((smx_context_t)context);
128 static void smx_ctx_java_free(smx_context_t context)
131 smx_ctx_java_t ctx_java = (smx_ctx_java_t) context;
132 if (ctx_java->thread) { /* We are not in maestro context */
133 xbt_os_thread_join(ctx_java->thread, NULL);
134 xbt_os_sem_destroy(ctx_java->begin);
135 xbt_os_sem_destroy(ctx_java->end);
138 smx_ctx_base_free(context);
142 void smx_ctx_java_stop(smx_context_t context)
144 smx_ctx_java_t ctx_java = (smx_ctx_java_t)context;
145 /* I am the current process and I am dying */
146 if (context->iwannadie == -1) {
147 context->iwannadie = 0;
148 JNIEnv *env = get_current_thread_env();
149 jxbt_throw_by_name(env, "org/simgrid/msg/ProcessKilledError", bprintf("Process killed :)"));
150 THROWF(cancel_error, 0, "process cancelled");
153 smx_ctx_base_stop(context);
154 /* detach the thread and kills it */
155 JNIEnv *env = ctx_java->jenv;
156 (*env)->DeleteGlobalRef(env,ctx_java->jprocess);
157 JavaVM *jvm = get_current_vm();
158 jint error = (*jvm)->DetachCurrentThread(jvm);
159 xbt_assert((error == JNI_OK), "The thread couldn't be detached.");
160 xbt_os_sem_release(((smx_ctx_java_t)context)->end);
161 xbt_os_thread_exit(NULL);
166 static void smx_ctx_java_suspend(smx_context_t context)
168 smx_ctx_java_t ctx_java = (smx_ctx_java_t) context;
169 xbt_os_sem_release(ctx_java->end);
170 xbt_os_sem_acquire(ctx_java->begin);
173 // FIXME: inline those functions
174 static void smx_ctx_java_resume(smx_context_t new_context)
176 smx_ctx_java_t ctx_java = (smx_ctx_java_t) new_context;
177 xbt_os_sem_release(ctx_java->begin);
178 xbt_os_sem_acquire(ctx_java->end);
181 static void smx_ctx_java_runall(void)
183 xbt_dynar_t processes = SIMIX_process_get_runnable();
184 smx_process_t process;
186 xbt_dynar_foreach(processes, cursor, process) {
187 smx_ctx_java_resume(SIMIX_process_get_context(process));