void message_dispatch(void)
{
int msg_type;
pid_t src;
void *buf;
size_t len;
struct dispatch_fns *dfn;
int n_handled;
if (!received_signal) return;
DEBUG(10,("message_dispatch: received_signal = %d\n", received_signal));
received_signal = 0;
while (message_recv(&msg_type, &src, &buf, &len)) {
DEBUG(10,("message_dispatch: received msg_type=%d src_pid=%u\n",
msg_type, (unsigned int) src));
n_handled = 0;
for (dfn = dispatch_fns; dfn; dfn = dfn->next) {
if (dfn->msg_type == msg_type) {
DEBUG(10,("message_dispatch: processing message of type %d.\n", msg_type));
dfn->fn(msg_type, src, buf, len);
n_handled++;
}
}
if (!n_handled) {
DEBUG(5,("message_dispatch: warning: no handlers registed for "
"msg_type %d in pid%u\n",
msg_type, (unsigned int)getpid()));
}
SAFE_FREE(buf);
}
}
static void *
juggling_thread(void *arg)
{
int fd2, i, j;
fd2 = *(int *)arg;
if (pthread_mutex_lock(&threaded_mtx) != 0)
err(-1, "juggling_thread: pthread_mutex_lock");
threaded_child_ready = 1;
if (pthread_cond_signal(&threaded_cond) != 0)
err(-1, "juggling_thread: pthread_cond_signal");
if (pthread_mutex_unlock(&threaded_mtx) != 0)
err(-1, "juggling_thread: pthread_mutex_unlock");
for (i = 0; i < NUMCYCLES; i++) {
for (j = 0; j < threaded_pipeline; j++) {
if (message_recv(fd2) < 0)
err(-1, "message_recv fd2");
if (message_send(fd2) < 0)
err(-1, "message_send fd2");
}
}
return (NULL);
}
static struct timespec
thread_juggle(int fd1, int fd2, int pipeline)
{
struct timespec tstart, tfinish;
pthread_t thread;
int i, j;
threaded_pipeline = pipeline;
if (pthread_mutex_init(&threaded_mtx, NULL) != 0)
err(-1, "thread_juggle: pthread_mutex_init");
if (pthread_create(&thread, NULL, juggling_thread, &fd2) != 0)
err(-1, "thread_juggle: pthread_create");
if (pthread_mutex_lock(&threaded_mtx) != 0)
err(-1, "thread_juggle: pthread_mutex_lock");
while (!threaded_child_ready) {
if (pthread_cond_wait(&threaded_cond, &threaded_mtx) != 0)
err(-1, "thread_juggle: pthread_cond_wait");
}
if (pthread_mutex_unlock(&threaded_mtx) != 0)
err(-1, "thread_juggle: pthread_mutex_unlock");
if (clock_gettime(CLOCK_REALTIME, &tstart) < 0)
err(-1, "thread_juggle: clock_gettime");
for (i = 0; i < NUMCYCLES; i++) {
for (j = 0; j < pipeline; j++) {
if (message_send(fd1) < 0)
err(-1, "message_send fd1");
}
for (j = 0; j < pipeline; j++) {
if (message_recv(fd1) < 0)
err(-1, "message_recv fd1");
}
}
if (clock_gettime(CLOCK_REALTIME, &tfinish) < 0)
err(-1, "thread_juggle: clock_gettime");
if (pthread_join(thread, NULL) != 0)
err(-1, "thread_juggle: pthread_join");
timespecsub(&tfinish, &tstart);
return (tfinish);
}
/*
* Juggle messages between two file descriptors in a single thread/process,
* so simply a measure of IPC performance.
*/
static struct timespec
juggle(int fd1, int fd2, int pipeline)
{
struct timespec tstart, tfinish;
int i, j;
if (clock_gettime(CLOCK_REALTIME, &tstart) < 0)
err(-1, "juggle: clock_gettime");
for (i = 0; i < NUMCYCLES; i++) {
for (j = 0; j < pipeline; j++) {
if (message_send(fd1) < 0)
err(-1, "message_send fd1");
}
for (j = 0; j < pipeline; j++) {
if (message_recv(fd2) < 0)
err(-1, "message_recv fd2");
if (message_send(fd2) < 0)
err(-1, "message_send fd2");
}
for (j = 0; j < pipeline; j++) {
if (message_recv(fd1) < 0)
err(-1, "message_recv fd1");
}
}
if (clock_gettime(CLOCK_REALTIME, &tfinish) < 0)
err(-1, "juggle: clock_gettime");
timespecsub(&tfinish, &tstart);
return (tfinish);
}
void message_dispatch(void)
{
int msg_type;
struct process_id src;
char *buf;
char *msgs_buf;
size_t len, total_len;
struct dispatch_fns *dfn;
int n_handled;
if (!received_signal)
return;
DEBUG(10,("message_dispatch: received_signal = %d\n", received_signal));
received_signal = 0;
if (!retrieve_all_messages(&msgs_buf, &total_len))
return;
for (buf = msgs_buf; message_recv(msgs_buf, total_len, &msg_type, &src, &buf, &len); buf += len) {
DEBUG(10,("message_dispatch: received msg_type=%d "
"src_pid=%u\n", msg_type,
(unsigned int) procid_to_pid(&src)));
n_handled = 0;
for (dfn = dispatch_fns; dfn; dfn = dfn->next) {
if (dfn->msg_type == msg_type) {
DEBUG(10,("message_dispatch: processing message of type %d.\n", msg_type));
dfn->fn(msg_type, src, len ? (void *)buf : NULL, len);
n_handled++;
}
}
if (!n_handled) {
DEBUG(5,("message_dispatch: warning: no handlers registed for "
"msg_type %d in pid %u\n",
msg_type, (unsigned int)sys_getpid()));
}
}
SAFE_FREE(msgs_buf);
}
/**
* Sends the given class to the remote server for instrumentation. If the
* server modified the class, provided class definition structure is updated
* and the function returns TRUE. Otherwise, the structure is left unmodified
* and FALSE is returned.
*
* NOTE: The class_name parameter may be NULL -- this is often the case for
* anonymous classes.
*/
static bool
__instrument_class (
jint request_flags, const char * class_name,
jvmtiClassDefinition * class_def
) {
//
// Put the class data into a request message, acquire a connection and
// send the it to the server. Receive the response and release the
// connection again.
//
struct message request = {
.message_flags = request_flags,
.control_size = (class_name != NULL) ? strlen (class_name) : 0,
.classcode_size = class_def->class_byte_count,
.control = (unsigned char *) class_name,
.classcode = class_def->class_bytes,
};
//
struct connection * conn = network_acquire_connection ();
message_send (conn, &request);
struct message response;
message_recv (conn, &response);
network_release_connection (conn);
//
// Check if error occurred on the server.
// The control field of the response contains the error message.
//
if (response.control_size > 0) {
fprintf (
stderr, "%sinstrumentation server error:\n%s\n",
ERROR_PREFIX, response.control
);
exit (ERROR_SERVER);
}
//
// Update the class definition and signal that the class has been
// modified if non-empty class code has been returned. Otherwise,
// signal that the class has not been modified.
//
if (response.classcode_size > 0) {
class_def->class_byte_count = response.classcode_size;
class_def->class_bytes = response.classcode;
return true;
} else {
return false;
}
}
static void
__handle_exception (JNIEnv * jni, jthrowable ex_obj) {
jclass ex_class = (* jni)->GetObjectClass (jni, ex_obj);
jmethodID m_getClass = (* jni)->GetMethodID (jni, ex_class, "getClass", "()Ljava/lang/Class;");
jobject cl_obj = (* jni)->CallObjectMethod (jni, ex_obj, m_getClass);
jclass cl_class = (* jni)->GetObjectClass (jni, cl_obj);
jmethodID m_getName = (* jni)->GetMethodID (jni, cl_class, "getName", "()Ljava/lang/String;");
jstring cl_name = (* jni)->CallObjectMethod (jni, cl_obj, m_getName);
const char * cl_name_chars = (* jni)->GetStringUTFChars (jni, cl_name, NULL);
rdaprintf ("\texception %s occured, cleared\n", cl_name_chars);
(* jni)->ReleaseStringUTFChars (jni, cl_name, cl_name_chars);
}
static void child (int conn, fsp_backend *backend, fs_backend *be)
{
int auth = 0;
while (1) {
fs_segment segment;
unsigned int length;
unsigned char *msg = message_recv(conn, &segment, &length);
unsigned char *reply = NULL;
unsigned char *content = msg + FS_HEADER;
if (!msg) {
/* if the connection is in fact closed, this won't matter,
but otherwise this error might help */
reply = fsp_error_new(segment, "protocol mismatch");
unsigned int* const l = (unsigned int *) (reply + 4);
unsigned int length = *l;
if (write(conn, reply, FS_HEADER + length) != (FS_HEADER+length)) {
fs_error(LOG_ERR, "write failed: %s", strerror(errno));
}
break;
}
if (auth) {
switch (msg[3]) {
case FS_NO_OP:
reply = fsp_handle_no_op(segment, length, content);
break;
case FS_RESOLVE:
reply = handle(backend->resolve, be, segment, length, content);
break;
case FS_BIND:
reply = handle(backend->bind, be, segment, length, content);
break;
case FS_PRICE_BIND:
reply = handle(backend->price, be, segment, length, content);
break;
case FS_DELETE_MODEL:
reply = handle(backend->delete_models, be, segment, length, content);
break;
case FS_INSERT_RESOURCE:
reply = handle(backend->insert_resource, be, segment, length, content);
break;
case FS_SEGMENTS:
reply = handle(backend->segments, be, segment, length, content);
break;
case FS_COMMIT_RESOURCE:
reply = handle(backend->commit_resource, be, segment, length, content);
break;
case FS_START_IMPORT:
reply = handle(backend->start_import, be, segment, length, content);
break;
case FS_STOP_IMPORT:
reply = handle(backend->stop_import, be, segment, length, content);
break;
case FS_GET_SIZE:
reply = handle(backend->get_data_size, be, segment, length, content);
break;
case FS_GET_IMPORT_TIMES:
reply = handle(backend->get_import_times, be, segment, length, content);
break;
case FS_INSERT_QUAD:
reply = handle(backend->insert_quad, be, segment, length, content);
break;
case FS_COMMIT_QUAD:
reply = handle(backend->commit_quad, be, segment, length, content);
break;
case FS_GET_QUERY_TIMES:
reply = handle(backend->get_query_times, be, segment, length, content);
break;
case FS_BIND_LIMIT:
reply = handle(backend->bind_limit, be, segment, length, content);
break;
case FS_BNODE_ALLOC:
reply = handle(backend->bnode_alloc, be, segment, length, content);
break;
case FS_RESOLVE_ATTR:
reply = handle(backend->resolve_attr, be, segment, length, content);
break;
case FS_DELETE_MODELS:
reply = handle(backend->delete_models, be, segment, length, content);
break;
case FS_NEW_MODELS:
reply = handle(backend->new_models, be, segment, length, content);
break;
case FS_BIND_FIRST:
reply = handle(backend->bind_first, be, segment, length, content);
break;
case FS_BIND_NEXT:
reply = handle(backend->bind_next, be, segment, length, content);
break;
case FS_BIND_DONE:
reply = handle(backend->bind_done, be, segment, length, content);
break;
case FS_TRANSACTION:
reply = handle(backend->transaction, be, segment, length, content);
break;
case FS_NODE_SEGMENTS:
reply = handle(backend->node_segments, be, segment, length, content);
break;
case FS_REVERSE_BIND:
reply = handle(backend->reverse_bind, be, segment, length, content);
break;
case FS_LOCK:
reply = handle(backend->lock, be, segment, length, content);
break;
case FS_UNLOCK:
reply = handle(backend->unlock, be, segment, length, content);
break;
case FS_GET_SIZE_REVERSE:
reply = handle(backend->get_size_reverse, be, segment, length, content);
break;
case FS_GET_QUAD_FREQ:
reply = handle(backend->get_quad_freq, be, segment, length, content);
break;
case FS_CHOOSE_SEGMENT:
reply = handle(backend->choose_segment, be, segment, length, content);
break;
case FS_DELETE_QUADS:
reply = handle(backend->delete_quads, be, segment, length, content);
break;
case FS_GET_UUID:
reply = handle(backend->get_uuid, be, segment, length, content);
break;
default:
kb_error(LOG_WARNING, "unexpected message type (%d)", msg[3]);
reply = fsp_error_new(segment, "unexpected message type");
break;
}
} else if (msg[3] == FS_AUTH) {
if (backend->auth) {
reply = backend->auth(be, segment, length, content);
} else {
reply = message_new(FS_DONE_OK, segment, 0);
}
if (reply[3] == FS_DONE_OK) auth = 1;
} else {
reply = fsp_error_new(segment, "authenticate before continuing");
}
if (reply) {
unsigned int* const l = (unsigned int *) (reply + 4);
unsigned int length = *l;
if (write(conn, reply, FS_HEADER + length) <= 0) {
kb_error(LOG_WARNING, "write reply failed");
}
free(reply);
}
free(msg);
}
}
/*
* Juggle messages between two file descriptors in two processes, so measure
* the cost of IPC and the cost of a process context switch.
*
* Since we can't use a mutex between the processes, we simply do an extra
* write on the child to let the parent know that it's ready to start.
*/
static struct timespec
process_juggle(int fd1, int fd2, int pipeline)
{
struct timespec tstart, tfinish;
pid_t pid, ppid, wpid;
int error, i, j;
ppid = getpid();
pid = fork();
if (pid < 0)
err(-1, "process_juggle: fork");
if (pid == 0) {
if (message_send(fd2) < 0) {
error = errno;
kill(ppid, SIGTERM);
errno = error;
err(-1, "process_juggle: child: message_send");
}
for (i = 0; i < NUMCYCLES; i++) {
for (j = 0; j < pipeline; j++) {
if (message_send(fd2) < 0)
err(-1, "message_send fd2");
if (message_recv(fd2) < 0)
err(-1, "message_recv fd2");
}
}
exit(0);
} else {
if (message_recv(fd1) < 0) {
error = errno;
kill(pid, SIGTERM);
errno = error;
err(-1, "process_juggle: parent: message_recv");
}
if (clock_gettime(CLOCK_REALTIME, &tstart) < 0)
err(-1, "process_juggle: clock_gettime");
for (i = 0; i < NUMCYCLES; i++) {
for (j = 0; j < pipeline; j++) {
if (message_send(fd1) < 0) {
error = errno;
kill(pid, SIGTERM);
errno = error;
err(-1, "message_send fd1");
}
}
for (j = 0; j < pipeline; j++) {
if (message_recv(fd1) < 0) {
error = errno;
kill(pid, SIGTERM);
errno = error;
err(-1, "message_recv fd1");
}
}
}
if (clock_gettime(CLOCK_REALTIME, &tfinish) < 0)
err(-1, "process_juggle: clock_gettime");
}
wpid = waitpid(pid, NULL, 0);
if (wpid < 0)
err(-1, "process_juggle: waitpid");
if (wpid != pid)
errx(-1, "process_juggle: waitpid: pid != wpid");
timespecsub(&tfinish, &tstart);
return (tfinish);
}
