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runtime_events_consumer.c
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runtime_events_consumer.c
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/**************************************************************************/
/* */
/* OCaml */
/* */
/* Sadiq Jaffer, Opsian */
/* */
/* Copyright 2021 Opsian Ltd */
/* */
/* All rights reserved. This file is distributed under the terms of */
/* the GNU Lesser General Public License version 2.1, with the */
/* special exception on linking described in the file LICENSE. */
/* */
/**************************************************************************/
#define CAML_INTERNALS
#include "caml/alloc.h"
#include "caml/callback.h"
#include "caml/custom.h"
#include "caml/fail.h"
#include "caml/runtime_events.h"
#include "caml/memory.h"
#include "caml/misc.h"
#include "caml/mlvalues.h"
#include "caml/osdeps.h"
#include "caml/platform.h"
#include <fcntl.h>
#include <stdatomic.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <process.h>
#include <processthreadsapi.h>
#include <wtypes.h>
#else
#include <sys/mman.h>
#endif
#if defined(HAS_UNISTD)
#include <unistd.h>
#endif
#define RING_FILE_NAME_MAX_LEN 512
struct caml_runtime_events_cursor {
int cursor_open; /* has this cursor been opened? */
atomic_uintnat cursor_in_poll; /* cursor is inside a read_poll() */
struct runtime_events_metadata_header *metadata; /* ptr to ring metadata */
uint64_t *current_positions; /* positions in the rings for each domain */
size_t ring_file_size_bytes; /* size of the runtime_events file in bytes */
int next_read_domain; /* the next domain to read from */
#ifdef _WIN32
HANDLE ring_file_handle;
HANDLE ring_handle;
#endif
/* callbacks */
int (*runtime_begin)(int domain_id, void *callback_data, uint64_t timestamp,
ev_runtime_phase phase);
int (*runtime_end)(int domain_id, void *callback_data, uint64_t timestamp,
ev_runtime_phase phase);
int (*runtime_counter)(int domain_id, void *callback_data,
uint64_t timestamp, ev_runtime_counter counter,
uint64_t val);
int (*alloc)(int domain_id, void *callback_data, uint64_t timestamp,
uint64_t *sz);
int (*lifecycle)(int domain_id, void *callback_data, int64_t timestamp,
ev_lifecycle lifecycle, int64_t data);
int (*lost_events)(int domain_id, void *callback_data, int lost_words);
/* user events: mapped from type to callback */
int (*user_unit)(int domain_id, void* callback_data, int64_t timestamp,
uintnat event_id, char* event_name);
int (*user_span)(int domain_id, void* callback_data, int64_t timestamp,
uintnat event_id, char* event_name, ev_user_span value);
int (*user_int)(int domain_id, void* callback_data, int64_t timestamp,
uintnat event_id, char* event_name, uint64_t val);
int (*user_custom)(int domain_id, void *callback_data, int64_t timestamp,
uintnat event_id, char* event_name,
uintnat event_data_len, uint64_t* event_data);
};
/* C-API for reading from an runtime_events */
runtime_events_error
caml_runtime_events_create_cursor(const char_os* runtime_events_path, int pid,
struct caml_runtime_events_cursor **cursor_res) {
int ret;
#ifndef _WIN32
int ring_fd;
struct stat tmp_stat;
#endif
struct caml_runtime_events_cursor *cursor =
caml_stat_alloc_noexc(sizeof(struct caml_runtime_events_cursor));
int should_free_events_loc;
char_os *runtime_events_loc;
if (cursor == NULL) {
return E_ALLOC_FAIL;
}
/* If pid < 0 then we create a cursor for the current process */
if (pid < 0) {
runtime_events_loc = caml_runtime_events_current_location();
should_free_events_loc = 0;
if( runtime_events_loc == NULL ) {
ret = E_NO_CURRENT_RING;
goto free_cursor;
}
} else {
runtime_events_loc = caml_stat_alloc_noexc(RING_FILE_NAME_MAX_LEN);
should_free_events_loc = 1;
if (runtime_events_loc == NULL) {
ret = E_ALLOC_FAIL;
goto free_cursor;
}
/* In this case we are reading the ring for a different process */
if (runtime_events_path) {
ret = snprintf_os(runtime_events_loc, RING_FILE_NAME_MAX_LEN,
T("%s/%d.events"), runtime_events_path, pid);
} else {
ret =
snprintf_os(runtime_events_loc, RING_FILE_NAME_MAX_LEN,
T("%d.events"), pid);
}
if (ret < 0) {
ret = E_PATH_FAILURE;
goto free_events_loc;
}
}
#ifdef _WIN32
cursor->ring_file_handle = CreateFile(
runtime_events_loc,
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL
);
if (cursor->ring_file_handle == INVALID_HANDLE_VALUE) {
ret = E_OPEN_FAILURE;
goto free_events_loc;
}
cursor->ring_handle = CreateFileMapping(
cursor->ring_file_handle,
NULL,
PAGE_READWRITE,
0,
0,
NULL
);
if (cursor->ring_handle == INVALID_HANDLE_VALUE) {
ret = E_MAP_FAILURE;
goto free_events_loc;
}
cursor->metadata = MapViewOfFile(
cursor->ring_handle,
FILE_MAP_ALL_ACCESS,
0,
0,
0
);
if( cursor->metadata == NULL ) {
ret = E_MAP_FAILURE;
goto free_events_loc;
}
cursor->ring_file_size_bytes = GetFileSize(cursor->ring_file_handle, NULL);
#else
ring_fd = open(runtime_events_loc, O_RDONLY, 0);
if( ring_fd == -1 ) {
ret = E_OPEN_FAILURE;
goto free_events_loc;
}
ret = fstat(ring_fd, &tmp_stat);
if (ret < 0) {
ret = E_OPEN_FAILURE;
goto free_events_loc;
}
cursor->ring_file_size_bytes = tmp_stat.st_size;
/* This cast is necessary for compatibility with Illumos' non-POSIX
mmap/munmap */
cursor->metadata = (struct runtime_events_metadata_header *)
mmap(NULL, cursor->ring_file_size_bytes, PROT_READ,
MAP_SHARED, ring_fd, 0);
if( cursor->metadata == MAP_FAILED ) {
ret = E_MAP_FAILURE;
goto free_events_loc;
}
#endif
cursor->current_positions =
caml_stat_alloc(cursor->metadata->max_domains * sizeof(uint64_t));
for (int j = 0; j < cursor->metadata->max_domains; j++) {
cursor->current_positions[j] = 0;
}
cursor->cursor_open = 1;
atomic_store(&cursor->cursor_in_poll, 0);
cursor->next_read_domain = 0;
cursor->runtime_begin = NULL;
cursor->runtime_end = NULL;
cursor->runtime_counter = NULL;
cursor->alloc = NULL;
cursor->lifecycle = NULL;
cursor->lost_events = NULL;
cursor->user_unit = NULL;
cursor->user_int = NULL;
cursor->user_span = NULL;
cursor->user_custom = NULL;
*cursor_res = cursor;
ret = E_SUCCESS;
free_events_loc:
if (should_free_events_loc) {
caml_stat_free(runtime_events_loc);
}
free_cursor:
if (ret != E_SUCCESS) {
caml_stat_free(cursor);
}
return ret;
}
void caml_runtime_events_set_runtime_begin(
struct caml_runtime_events_cursor *cursor,
int (*f)(int domain_id,
void *callback_data,
uint64_t timestamp,
ev_runtime_phase phase)) {
cursor->runtime_begin = f;
}
void caml_runtime_events_set_runtime_end(
struct caml_runtime_events_cursor *cursor,
int (*f)(int domain_id, void *callback_data,
uint64_t timestamp,
ev_runtime_phase phase)) {
cursor->runtime_end = f;
}
void caml_runtime_events_set_runtime_counter(
struct caml_runtime_events_cursor *cursor,
int (*f)(int domain_id, void *callback_data, uint64_t timestamp,
ev_runtime_counter counter, uint64_t val)) {
cursor->runtime_counter = f;
}
void caml_runtime_events_set_alloc(struct caml_runtime_events_cursor *cursor,
int (*f)(int domain_id, void *callback_data,
uint64_t timestamp, uint64_t *sz)) {
cursor->alloc = f;
}
void caml_runtime_events_set_lifecycle(
struct caml_runtime_events_cursor *cursor,
int (*f)(int domain_id, void *callback_data,
int64_t timestamp,
ev_lifecycle lifecycle,
int64_t data)) {
cursor->lifecycle = f;
}
void caml_runtime_events_set_lost_events(
struct caml_runtime_events_cursor *cursor,
int (*f)(int domain_id,
void *callback_data,
int lost_words)) {
cursor->lost_events = f;
}
void caml_runtime_events_set_user_unit(
struct caml_runtime_events_cursor *cursor,
int (*f)(int domain_id, void *callback_data,
int64_t timestamp,
uintnat event_id,
char* event_name)) {
cursor->user_unit = f;
}
void caml_runtime_events_set_user_span(
struct caml_runtime_events_cursor *cursor,
int (*f)(int domain_id, void *callback_data,
int64_t timestamp,
uintnat event_id,
char* event_name,
ev_user_span span)) {
cursor->user_span = f;
}
void caml_runtime_events_set_user_int(
struct caml_runtime_events_cursor *cursor,
int (*f)(int domain_id, void *callback_data,
int64_t timestamp,
uintnat event_id,
char* event_name,
uint64_t val)) {
cursor->user_int = f;
}
void caml_runtime_events_set_user_custom(
struct caml_runtime_events_cursor *cursor,
int (*f)(int domain_id, void *callback_data,
int64_t timestamp,
uintnat event_id,
char* event_name,
uintnat event_data_len,
uint64_t* event_data)) {
cursor->user_custom = f;
}
/* frees a cursor obtained from caml_runtime_events_reader_create */
void caml_runtime_events_free_cursor(struct caml_runtime_events_cursor *cursor){
if (cursor->cursor_open) {
cursor->cursor_open = 0;
#ifdef _WIN32
UnmapViewOfFile(cursor->metadata);
CloseHandle(cursor->ring_file_handle);
CloseHandle(cursor->ring_handle);
#else
/* This cast is necessary for compatibility with Illumos' non-POSIX
mmap/munmap */
munmap((void*)cursor->metadata, cursor->ring_file_size_bytes);
#endif
caml_stat_free(cursor->current_positions);
caml_stat_free(cursor);
}
}
runtime_events_error
caml_runtime_events_read_poll(struct caml_runtime_events_cursor *cursor,
void *callback_data, uintnat max_events,
uintnat *events_consumed) {
int consumed = 0;
int start_domain = cursor->next_read_domain;
uint64_t ring_head, ring_tail;
int early_exit = 0;
uintnat in_poll = 0;
if (!cursor->cursor_open) {
return E_CURSOR_NOT_OPEN;
}
/* prevent cursors from being polled in parallel by more than one domain and
also reentrant callbacks */
if (cursor->cursor_in_poll
|| !atomic_compare_exchange_strong(&cursor->cursor_in_poll, &in_poll, 1) ) {
return E_CURSOR_POLL_BUSY;
}
/* this loop looks a bit odd because we're iterating from the last domain
that we read from on the last read_poll call and then looping around.
This is necessary because in the case where the consumer can't keep up
with message production (i.e max_events is hit each time) it ensures that
messages are read from all domains, rather than just the first. */
for (int i = 0; i < cursor->metadata->max_domains && !early_exit; i++) {
int domain_num = (start_domain + i) % cursor->metadata->max_domains;
struct runtime_events_buffer_header *runtime_events_buffer_header =
(struct runtime_events_buffer_header *)(
(char*)cursor->metadata +
cursor->metadata->headers_offset +
domain_num * cursor->metadata->ring_header_size_bytes
);
uint64_t *ring_ptr = (uint64_t *)((char*)cursor->metadata +
cursor->metadata->data_offset +
domain_num * cursor->metadata->ring_size_bytes);
do {
uint64_t buf[RUNTIME_EVENTS_MAX_MSG_LENGTH];
uint64_t ring_mask, header, msg_length;
ring_head = atomic_load_acquire(&runtime_events_buffer_header->ring_head);
ring_tail = atomic_load_acquire(&runtime_events_buffer_header->ring_tail);
if (ring_head > cursor->current_positions[domain_num]) {
if (cursor->lost_events) {
if (!cursor->lost_events(domain_num, callback_data,
ring_head -
cursor->current_positions[domain_num])){
early_exit = 1;
continue;
}
}
cursor->current_positions[domain_num] = ring_head;
}
if (cursor->current_positions[domain_num] >= ring_tail) {
break;
}
ring_mask = cursor->metadata->ring_size_elements - 1;
header = ring_ptr[cursor->current_positions[domain_num] & ring_mask];
msg_length = RUNTIME_EVENTS_ITEM_LENGTH(header);
if (msg_length > RUNTIME_EVENTS_MAX_MSG_LENGTH) {
atomic_store(&cursor->cursor_in_poll, 0);
return E_CORRUPT_STREAM;
}
memcpy(buf,
ring_ptr + (cursor->current_positions[domain_num] & ring_mask),
msg_length * sizeof(uint64_t));
atomic_thread_fence(memory_order_seq_cst);
ring_head = atomic_load_acquire(&runtime_events_buffer_header->ring_head);
/* Check the message we've read hasn't been overwritten by the writer */
if (ring_head > cursor->current_positions[domain_num]) {
/* It potentially has, retry for the next one after we've notified
the callbacks about lost messages. */
int lost_words = ring_head - cursor->current_positions[domain_num];
cursor->current_positions[domain_num] = ring_head;
if (cursor->lost_events) {
if( !(cursor->lost_events(domain_num, callback_data, lost_words)) ) {
early_exit = 1;
}
}
continue;
}
if (RUNTIME_EVENTS_ITEM_IS_RUNTIME(header)) {
switch (RUNTIME_EVENTS_ITEM_TYPE(header)) {
case EV_BEGIN:
if (cursor->runtime_begin) {
if( !cursor->runtime_begin(domain_num, callback_data, buf[1],
RUNTIME_EVENTS_ITEM_ID(header)) ) {
early_exit = 1;
continue;
}
}
break;
case EV_EXIT:
if (cursor->runtime_end) {
if( !cursor->runtime_end(domain_num, callback_data, buf[1],
RUNTIME_EVENTS_ITEM_ID(header)) ) {
early_exit = 1;
continue;
};
}
break;
case EV_COUNTER:
if (cursor->runtime_counter) {
if( !cursor->runtime_counter(domain_num, callback_data, buf[1],
RUNTIME_EVENTS_ITEM_ID(header), buf[2]
) ) {
early_exit = 1;
continue;
};
}
break;
case EV_ALLOC:
if (cursor->alloc) {
if( !cursor->alloc(domain_num, callback_data, buf[1], &buf[2])) {
early_exit = 1;
continue;
}
}
break;
case EV_LIFECYCLE:
if (cursor->lifecycle) {
if( !cursor->lifecycle(domain_num, callback_data, buf[1],
RUNTIME_EVENTS_ITEM_ID(header), buf[2]) ) {
early_exit = 1;
continue;
}
}
}
} else {
// User events
uintnat event_id = RUNTIME_EVENTS_ITEM_ID(header);
struct runtime_events_custom_event *custom_event =
&((struct runtime_events_custom_event *)
((char *)cursor->metadata + cursor->metadata->custom_events_offset))
[event_id];
char* event_name = custom_event->name;
ev_user_message_type event_type = RUNTIME_EVENTS_ITEM_TYPE(header);
switch (event_type) {
case EV_USER_MSG_TYPE_UNIT:
if (cursor->user_unit) {
if( !cursor->user_unit(domain_num, callback_data, buf[1],
event_id, event_name) ) {
early_exit = 1;
continue;
}
}
break;
case EV_USER_MSG_TYPE_SPAN_BEGIN:
case EV_USER_MSG_TYPE_SPAN_END:
if (cursor->user_span) {
ev_user_span event_span;
if (event_type == EV_USER_MSG_TYPE_SPAN_BEGIN) {
event_span = EV_USER_SPAN_BEGIN;
} else {
event_span = EV_USER_SPAN_END;
}
if( !cursor->user_span(domain_num, callback_data, buf[1],
event_id, event_name, event_span) ) {
early_exit = 1;
continue;
}
}
break;
case EV_USER_MSG_TYPE_INT:
if (cursor->user_int) {
if( !cursor->user_int(domain_num, callback_data, buf[1],
event_id, event_name, buf[2]) ) {
early_exit = 1;
continue;
}
}
break;
default: // custom
if (cursor->user_custom) {
if( !cursor->user_custom(domain_num, callback_data, buf[1],
event_id, event_name,
msg_length - 2, &buf[2]) ) {
early_exit = 1;
continue;
}
}
break;
}
}
if (RUNTIME_EVENTS_ITEM_TYPE(header) != EV_INTERNAL) {
consumed++;
}
cursor->current_positions[domain_num] += msg_length;
} while (cursor->current_positions[domain_num] < ring_tail &&
(max_events == 0 || consumed < max_events) && !early_exit);
/* next domain to read from (saved in the cursor so we can resume from it
if need be in the next poll of the cursor). */
cursor->next_read_domain =
(domain_num + 1 == cursor->metadata->max_domains) ? 0 : domain_num + 1;
}
if (events_consumed != NULL) {
*events_consumed = consumed;
}
atomic_store(&cursor->cursor_in_poll, 0);
return E_SUCCESS;
}
/* OCaml for reading from an runtime_events */
#define Cursor_val(v) \
(*((struct caml_runtime_events_cursor **)Data_custom_val(v)))
static void finalise_cursor(value v) {
struct caml_runtime_events_cursor *cursor = Cursor_val(v);
if (cursor != NULL) {
caml_runtime_events_free_cursor(cursor);
Cursor_val(v) = NULL;
}
}
/* Used for passing the collection of callbacks and also storing raised
exceptions */
struct callbacks_exception_holder {
value* callbacks_val;
value* exception;
value* wrapper;
};
static int ml_runtime_begin(int domain_id, void *callback_data,
uint64_t timestamp, ev_runtime_phase phase) {
CAMLparam0();
CAMLlocal5(tmp_callback, ts_val, msg_type, callbacks_root, res);
struct callbacks_exception_holder* holder = callback_data;
callbacks_root = *holder->callbacks_val;
tmp_callback = Field(callbacks_root, 0); /* ev_runtime_begin */
if (Is_some(tmp_callback)) {
ts_val = caml_copy_int64(timestamp);
msg_type = Val_long(phase);
res = caml_callback3_exn(Some_val(tmp_callback), Val_long(domain_id),
ts_val, msg_type);
if( Is_exception_result(res) ) {
res = Extract_exception(res);
*holder->exception = res;
CAMLreturnT(int, 0);
}
}
CAMLreturnT(int, 1);
}
static int ml_runtime_end(int domain_id, void *callback_data,
uint64_t timestamp, ev_runtime_phase phase) {
CAMLparam0();
CAMLlocal5(tmp_callback, ts_val, msg_type, callbacks_root, res);
struct callbacks_exception_holder* holder = callback_data;
callbacks_root = *holder->callbacks_val;
tmp_callback = Field(callbacks_root, 1); /* ev_runtime_end */
if (Is_some(tmp_callback)) {
ts_val = caml_copy_int64(timestamp);
msg_type = Val_long(phase);
res = caml_callback3_exn(Some_val(tmp_callback), Val_long(domain_id),
ts_val, msg_type);
if( Is_exception_result(res) ) {
res = Extract_exception(res);
*holder->exception = res;
CAMLreturnT(int, 0);
}
}
CAMLreturnT(int, 1);
}
static int ml_runtime_counter(int domain_id, void *callback_data,
uint64_t timestamp, ev_runtime_counter counter,
uint64_t val) {
CAMLparam0();
CAMLlocal3(tmp_callback, callbacks_root, res);
CAMLlocalN(params, 4);
struct callbacks_exception_holder* holder = callback_data;
callbacks_root = *holder->callbacks_val;
tmp_callback = Field(callbacks_root, 2); /* ev_runtime_counter */
if (Is_some(tmp_callback)) {
params[0] = Val_long(domain_id);
params[1] = caml_copy_int64(timestamp);
params[2] = Val_long(counter);
params[3] = Val_long(val);
res = caml_callbackN_exn(Some_val(tmp_callback), 4, params);
if( Is_exception_result(res) ) {
res = Extract_exception(res);
*holder->exception = res;
CAMLreturnT(int, 0);
}
}
CAMLreturnT(int, 1);
}
static int ml_alloc(int domain_id, void *callback_data, uint64_t timestamp,
uint64_t *sz) {
CAMLparam0();
CAMLlocal5(tmp_callback, ts_val, misc_val, callbacks_root, res);
struct callbacks_exception_holder* holder = callback_data;
callbacks_root = *holder->callbacks_val;
tmp_callback = Field(callbacks_root, 3); /* ev_alloc */
if (Is_some(tmp_callback)) {
int i;
ts_val = caml_copy_int64(timestamp);
misc_val = caml_alloc(RUNTIME_EVENTS_NUM_ALLOC_BUCKETS, 0);
for (i = 0; i < RUNTIME_EVENTS_NUM_ALLOC_BUCKETS; i++) {
Store_field(misc_val, i, Val_long(sz[i]));
}
res = caml_callback3_exn(Some_val(tmp_callback), Val_long(domain_id),
ts_val, misc_val);
if( Is_exception_result(res) ) {
res = Extract_exception(res);
*holder->exception = res;
CAMLreturnT(int, 0);
}
}
CAMLreturnT(int, 1);
}
static int ml_lifecycle(int domain_id, void *callback_data, int64_t timestamp,
ev_lifecycle lifecycle, int64_t data) {
CAMLparam0();
CAMLlocal3(tmp_callback, callbacks_root, res);
CAMLlocalN(params, 4);
struct callbacks_exception_holder* holder = callback_data;
callbacks_root = *holder->callbacks_val;
tmp_callback = Field(callbacks_root, 4); /* ev_lifecycle */
if (Is_some(tmp_callback)) {
params[0] = Val_long(domain_id);
params[1] = caml_copy_int64(timestamp);
params[2] = Val_long(lifecycle);
if (data != 0) {
params[3] = caml_alloc(1, 0);
Store_field(params[3], 0, Val_long(data));
} else {
params[3] = Val_none;
}
res = caml_callbackN_exn(Some_val(tmp_callback), 4, params);
if( Is_exception_result(res) ) {
res = Extract_exception(res);
*holder->exception = res;
CAMLreturnT(int, 0);
}
}
CAMLreturnT(int, 1);
}
static int ml_lost_events(int domain_id, void *callback_data, int lost_words) {
CAMLparam0();
CAMLlocal3(tmp_callback, callbacks_root, res);
struct callbacks_exception_holder* holder = callback_data;
callbacks_root = *holder->callbacks_val;
tmp_callback = Field(callbacks_root, 5); /* lost_events */
if (Is_some(tmp_callback)) {
res = caml_callback2_exn(Some_val(tmp_callback), Val_long(domain_id),
Val_long(lost_words));
if( Is_exception_result(res) ) {
res = Extract_exception(res);
*holder->exception = res;
CAMLreturnT(int, 0);
}
}
CAMLreturnT(int, 1);
}
static value user_events_find_callback_list_for_event_type(value callbacks_root,
value event) {
CAMLparam2(callbacks_root, event);
CAMLlocal2(tmp_callback_array, event_type);
tmp_callback_array = Field(callbacks_root, 6); /* ev_user_events */
uintnat array_length = caml_array_length(tmp_callback_array);
uintnat event_index;
event_type = Field(event, 2);
/* we seek to obtain the event type ID
module Type = struct
type 'a custom = {
serialize: bytes -> 'a -> int;
deserialize: bytes -> int -> 'a;
id: int;
}
type 'a t =
| Unit : unit t
| Int : int t
| Span : span t
| Custom : 'a custom -> 'a t
end
*/
if (Is_block(event_type)) {
// Custom
event_index = Int_val(Field(Field(event_type, 0), 2));
} else {
// Unit | Int | Span
event_index = Int_val(event_type);
}
if (event_index >= array_length) {
CAMLreturn(Val_none);
}
CAMLreturn(Field(tmp_callback_array, event_index));
}
static int user_events_call_callback_list(
struct callbacks_exception_holder* holder, value callback_list,
value params[4]) {
CAMLparam5(callback_list, params[0], params[1], params[2], params[3]);
CAMLlocal2(callback, res);
while (Is_block(callback_list)) {
// two indirections as callback is a list item wrapped in a gadt
callback = Field(Field(callback_list, 0), 0);
res = caml_callbackN_exn(callback, 4, params);
if( Is_exception_result(res) ) {
res = Extract_exception(res);
*holder->exception = res;
CAMLreturnT(int, 0);
}
callback_list = Field(callback_list, 1);
}
CAMLreturnT(int, 1);
}
static value caml_runtime_events_user_resolve_cached(
value wrapper_root, uintnat event_id, char* event_name,
ev_user_ml_type event_type)
{
CAMLparam1(wrapper_root);
CAMLlocal3(event, cache_resized, cache);
cache = Field(wrapper_root, 2);
if (!Is_block(cache)) {
// initialize cache array
uintnat new_len = 256;
while (event_id >= new_len) {
new_len *= 2;
}
cache_resized = caml_alloc(new_len, 0);
for (uintnat i = 0; i < new_len; i++) {
Field(cache_resized, i) = Val_none;
}
Store_field(wrapper_root, 2, cache_resized);
cache = cache_resized;
}
uintnat len = Wosize_val(cache);
if (event_id < len) {
if (Is_block(Field(cache, event_id))) {
// cache hit !
CAMLreturn (Field(cache, event_id));
}
}
// we never encountered this ID
event = caml_runtime_events_user_resolve(event_name, event_type);
if (event_id >= len) {
// we grow the cache to fit the event
// maximum ID is RUNTIME_EVENTS_MAX_CUSTOM_EVENTS - 1
uintnat new_len = len * 2;
while (event_id >= new_len) {
new_len *= 2;
}
cache_resized = caml_alloc(new_len, 0);
// copy values from the cache to the new array
for (uintnat i = 0; i < len; i++) {
caml_initialize(&Field(cache_resized, i), Field(cache, i));
}
// the rest of the values is None
// update the wrapper structure
Store_field(wrapper_root, 2, cache_resized);
cache = cache_resized;
}
// store event in the cache
Store_field(cache, event_id, event);
CAMLreturn(event);
}
static int ml_user_unit(int domain_id, void *callback_data, int64_t timestamp,
uintnat event_id, char* event_name) {
CAMLparam0();
CAMLlocal3(callback_list, event, callbacks_root);
CAMLlocalN(params, 4);
CAMLlocal1(wrapper_root);
struct callbacks_exception_holder* holder = callback_data;
callbacks_root = *holder->callbacks_val;
wrapper_root = *holder->wrapper;
event = caml_runtime_events_user_resolve_cached(wrapper_root, event_id,
event_name,
EV_USER_ML_TYPE_UNIT);
callback_list = user_events_find_callback_list_for_event_type(callbacks_root,
event);
if (Is_block(callback_list)) {
// at least one callback is listening for this event type, so we
// deserialize the value and prepare the callback payload
params[0] = Val_long(domain_id);
params[1] = caml_copy_int64(timestamp);
params[2] = event;
params[3] = Val_unit;
// payload is prepared, we call the callbacks sequentially.
if (user_events_call_callback_list(holder, callback_list, params) == 0) {
CAMLreturnT(int, 0);
}
}
CAMLreturnT(int, 1);
}
static int ml_user_span(int domain_id, void *callback_data, int64_t timestamp,
uintnat event_id, char* event_name,
ev_user_span span)
{
CAMLparam0();
CAMLlocal3(callback_list, event, callbacks_root);
CAMLlocalN(params, 4);
CAMLlocal1(wrapper_root);
struct callbacks_exception_holder* holder = callback_data;
callbacks_root = *holder->callbacks_val;
wrapper_root = *holder->wrapper;
event = caml_runtime_events_user_resolve_cached(wrapper_root, event_id,
event_name,
EV_USER_ML_TYPE_SPAN);
callback_list = user_events_find_callback_list_for_event_type(callbacks_root,
event);
if (Is_block(callback_list)) {
// at least one callback is listening for this event type, so we
// deserialize the value and prepare the callback payload
params[0] = Val_long(domain_id);
params[1] = caml_copy_int64(timestamp);
params[2] = event;
params[3] = Val_int(span);
// payload is prepared, we call the callbacks sequentially.
if (user_events_call_callback_list(holder, callback_list, params) == 0) {
CAMLreturnT(int, 0);
}
}
CAMLreturnT(int, 1);
}
static int ml_user_int(int domain_id, void *callback_data,
int64_t timestamp, uintnat event_id,
char* event_name, uint64_t val) {
CAMLparam0();
CAMLlocal3(callback_list, event, callbacks_root);
CAMLlocalN(params, 4);
CAMLlocal1(wrapper_root);
struct callbacks_exception_holder* holder = callback_data;
callbacks_root = *holder->callbacks_val;
wrapper_root = *holder->wrapper;
event = caml_runtime_events_user_resolve_cached(wrapper_root, event_id,
event_name,
EV_USER_ML_TYPE_INT);
callback_list = user_events_find_callback_list_for_event_type(callbacks_root,
event);
if (Is_block(callback_list)) {
// at least one callback is listening for this event type, so we