1 /* Java bindings to the Comm API */
3 /* Copyright (c) 2012-2022. 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. */
10 #include "jxbt_utilities.hpp"
14 XBT_LOG_EXTERNAL_DEFAULT_CATEGORY(java);
16 static jfieldID jcomm_field_Comm_bind;
17 static jfieldID jcomm_field_Comm_finished;
18 static jfieldID jcomm_field_Comm_receiving;
19 static jfieldID jtask_field_Comm_task;
20 static jfieldID jcomm_field_Comm_taskBind;
22 void jcomm_bind_task(JNIEnv *env, jobject jcomm) {
23 const_msg_comm_t comm = (msg_comm_t)(uintptr_t)env->GetLongField(jcomm, jcomm_field_Comm_bind);
24 //test if we are receiving or sending a task.
25 jboolean jreceiving = env->GetBooleanField(jcomm, jcomm_field_Comm_receiving);
26 if (jreceiving == JNI_TRUE) {
27 //bind the task object.
28 msg_task_t task = MSG_comm_get_task(comm);
29 xbt_assert(task != nullptr, "Task is nullptr");
30 auto jtask_global = static_cast<jobject>(MSG_task_get_data(task));
31 //case where the data has already been retrieved
32 if (jtask_global == nullptr) {
36 //Make sure the data will be correctly gc.
37 jobject jtask_local = env->NewLocalRef(jtask_global);
38 env->DeleteGlobalRef(jtask_global);
40 env->SetObjectField(jcomm, jtask_field_Comm_task, jtask_local);
42 MSG_task_set_data(task, nullptr);
46 JNIEXPORT void JNICALL Java_org_simgrid_msg_Comm_nativeInit(JNIEnv *env, jclass cls) {
47 jclass jfield_class_Comm = env->FindClass("org/simgrid/msg/Comm");
48 xbt_assert(jfield_class_Comm, "Native initialization of msg/Comm failed. Please report that bug");
50 jcomm_field_Comm_bind = jxbt_get_jfield(env, jfield_class_Comm, "bind", "J");
51 jcomm_field_Comm_taskBind = jxbt_get_jfield(env, jfield_class_Comm, "taskBind", "J");
52 jcomm_field_Comm_receiving = jxbt_get_jfield(env, jfield_class_Comm, "receiving", "Z");
53 jtask_field_Comm_task = jxbt_get_jfield(env, jfield_class_Comm, "task", "Lorg/simgrid/msg/Task;");
54 jcomm_field_Comm_finished = jxbt_get_jfield(env, jfield_class_Comm, "finished", "Z");
55 xbt_assert(jcomm_field_Comm_bind && jcomm_field_Comm_taskBind && jcomm_field_Comm_receiving &&
56 jtask_field_Comm_task && jcomm_field_Comm_finished,
57 "Native initialization of msg/Comm failed. Please report that bug");
60 JNIEXPORT void JNICALL Java_org_simgrid_msg_Comm_nativeFinalize(JNIEnv *env, jobject jcomm) {
61 msg_task_t *task_received;
63 task_received = (msg_task_t*) (uintptr_t) env->GetLongField(jcomm, jcomm_field_Comm_taskBind);
66 const_msg_comm_t comm = (msg_comm_t)(uintptr_t)env->GetLongField(jcomm, jcomm_field_Comm_bind);
67 MSG_comm_destroy(comm);
70 JNIEXPORT jboolean JNICALL Java_org_simgrid_msg_Comm_test(JNIEnv *env, jobject jcomm) {
72 comm = (msg_comm_t) (uintptr_t) env->GetLongField(jcomm, jcomm_field_Comm_bind);
74 jboolean finished = env->GetBooleanField(jcomm, jcomm_field_Comm_finished);
75 if (finished == JNI_TRUE) {
80 jxbt_throw_null(env, "comm is null");
84 if (MSG_comm_test(comm)) {
85 msg_error_t status = MSG_comm_get_status(comm);
86 if (status == MSG_OK) {
87 jcomm_bind_task(env,jcomm);
90 //send the correct exception
91 jmsg_throw_status(env,status);
97 JNIEXPORT void JNICALL Java_org_simgrid_msg_Comm_waitCompletion(JNIEnv *env, jobject jcomm, jdouble timeout) {
98 auto comm = (msg_comm_t)(uintptr_t)env->GetLongField(jcomm, jcomm_field_Comm_bind);
100 jxbt_throw_null(env, "comm is null");
104 jboolean finished = env->GetBooleanField(jcomm, jcomm_field_Comm_finished);
105 if (finished == JNI_TRUE) {
110 status = MSG_comm_wait(comm, timeout);
111 env->SetBooleanField(jcomm, jcomm_field_Comm_finished, JNI_TRUE);
112 if (status == MSG_OK) {
113 jcomm_bind_task(env,jcomm);
115 jmsg_throw_status(env,status);
119 static msg_comm_t* jarray_to_commArray(JNIEnv *env, jobjectArray jcomms, /* OUT */ int *count)
121 *count = env->GetArrayLength(jcomms);
122 auto* comms = new msg_comm_t[*count];
124 for (int i=0; i < *count; i++) {
125 jobject jcomm = env->GetObjectArrayElement(jcomms, i);
126 if (env->ExceptionOccurred())
129 comms[i] = (msg_comm_t) (uintptr_t) env->GetLongField(jcomm, jcomm_field_Comm_bind);
131 jxbt_throw_null(env, std::string("comm at rank ") + std::to_string(i) + " is null");
135 env->DeleteLocalRef(jcomm); // reduce the load on the garbage collector: we don't need that object anymore
139 JNIEXPORT void JNICALL Java_org_simgrid_msg_Comm_waitAll(JNIEnv *env, jclass cls, jobjectArray jcomms, jdouble timeout)
142 msg_comm_t* comms = jarray_to_commArray(env, jcomms, &count);
146 MSG_comm_waitall(comms, count, timeout);
149 JNIEXPORT int JNICALL Java_org_simgrid_msg_Comm_waitAny(JNIEnv *env, jclass cls, jobjectArray jcomms)
152 msg_comm_t* comms = jarray_to_commArray(env, jcomms, &count);
155 xbt_dynar_t dyn = xbt_dynar_new(sizeof(msg_comm_t),nullptr);
156 for (int i=0; i<count; i++) {
157 xbt_dynar_push(dyn, &(comms[i]));
160 int rank = MSG_comm_waitany(dyn);
162 xbt_dynar_free(&dyn);