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/*
* Copyright (C) 2019 Intel Corporation. All rights reserved.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#include "bh_platform.h"
#include "app_manager_export.h"
#include "../app-manager/module_wasm_app.h"
#include "timer_native_api.h"
typedef struct {
bh_list_link l;
timer_ctx_t timer_ctx;
} timer_ctx_node_t;
static bool timer_thread_run = true;
static bh_list g_timer_ctx_list;
static korp_cond g_timer_ctx_list_cond;
static korp_mutex g_timer_ctx_list_mutex;
void
wasm_timer_callback(timer_id_t id, unsigned int mod_id)
{
module_data *module = module_data_list_lookup_id(mod_id);
if (module == NULL)
return;
// !!! the length parameter must be 0, so the receiver will
// not free the payload pointer.
bh_post_msg(module->queue, TIMER_EVENT_WASM, (char *)(uintptr_t)id, 0);
}
/**
* why we create a separate link for module timer contexts
* rather than traverse the module list?
* It helps to reduce the lock frequency for the module list.
* Also when we lock the module list and then call the callback for
* timer expire, the callback is request the list lock again for lookup
* the module from module id. It is for avoiding that situation.
*/
void *
thread_modulers_timer_check(void *arg)
{
uint32 ms_to_expiry;
uint64 us_to_wait;
while (timer_thread_run) {
ms_to_expiry = (uint32)-1;
os_mutex_lock(&g_timer_ctx_list_mutex);
timer_ctx_node_t *elem =
(timer_ctx_node_t *)bh_list_first_elem(&g_timer_ctx_list);
while (elem) {
uint32 next = check_app_timers(elem->timer_ctx);
if (next != (uint32)-1) {
if (ms_to_expiry == (uint32)-1 || ms_to_expiry > next)
ms_to_expiry = next;
}
elem = (timer_ctx_node_t *)bh_list_elem_next(elem);
}
os_mutex_unlock(&g_timer_ctx_list_mutex);
if (ms_to_expiry == (uint32)-1)
us_to_wait = BHT_WAIT_FOREVER;
else
us_to_wait = (uint64)ms_to_expiry * 1000;
os_mutex_lock(&g_timer_ctx_list_mutex);
os_cond_reltimedwait(&g_timer_ctx_list_cond, &g_timer_ctx_list_mutex,
us_to_wait);
os_mutex_unlock(&g_timer_ctx_list_mutex);
}
return NULL;
}
void
wakeup_modules_timer_thread(timer_ctx_t ctx)
{
os_mutex_lock(&g_timer_ctx_list_mutex);
os_cond_signal(&g_timer_ctx_list_cond);
os_mutex_unlock(&g_timer_ctx_list_mutex);
}
bool
init_wasm_timer()
{
korp_tid tm_tid;
bh_list_init(&g_timer_ctx_list);
if (os_cond_init(&g_timer_ctx_list_cond) != 0) {
return false;
}
/* temp solution for: thread_modulers_timer_check thread
would recursive lock the mutex */
if (os_recursive_mutex_init(&g_timer_ctx_list_mutex) != 0) {
goto fail1;
}
if (0
!= os_thread_create(&tm_tid, thread_modulers_timer_check, NULL,
BH_APPLET_PRESERVED_STACK_SIZE)) {
goto fail2;
}
return true;
fail2:
os_mutex_destroy(&g_timer_ctx_list_mutex);
fail1:
os_cond_destroy(&g_timer_ctx_list_cond);
return false;
}
void
exit_wasm_timer()
{
timer_thread_run = false;
}
timer_ctx_t
create_wasm_timer_ctx(unsigned int module_id, int prealloc_num)
{
timer_ctx_t ctx =
create_timer_ctx(wasm_timer_callback, wakeup_modules_timer_thread,
prealloc_num, module_id);
if (ctx == NULL)
return NULL;
timer_ctx_node_t *node =
(timer_ctx_node_t *)wasm_runtime_malloc(sizeof(timer_ctx_node_t));
if (node == NULL) {
destroy_timer_ctx(ctx);
return NULL;
}
memset(node, 0, sizeof(*node));
node->timer_ctx = ctx;
os_mutex_lock(&g_timer_ctx_list_mutex);
bh_list_insert(&g_timer_ctx_list, node);
os_mutex_unlock(&g_timer_ctx_list_mutex);
return ctx;
}
void
destroy_module_timer_ctx(unsigned int module_id)
{
timer_ctx_node_t *elem;
os_mutex_lock(&g_timer_ctx_list_mutex);
elem = (timer_ctx_node_t *)bh_list_first_elem(&g_timer_ctx_list);
while (elem) {
if (timer_ctx_get_owner(elem->timer_ctx) == module_id) {
bh_list_remove(&g_timer_ctx_list, elem);
destroy_timer_ctx(elem->timer_ctx);
wasm_runtime_free(elem);
break;
}
elem = (timer_ctx_node_t *)bh_list_elem_next(elem);
}
os_mutex_unlock(&g_timer_ctx_list_mutex);
}
timer_ctx_t
get_wasm_timer_ctx(wasm_module_inst_t module_inst)
{
module_data *m = app_manager_get_module_data(Module_WASM_App, module_inst);
if (m == NULL)
return NULL;
return m->timer_ctx;
}
timer_id_t
wasm_create_timer(wasm_exec_env_t exec_env, int interval, bool is_period,
bool auto_start)
{
wasm_module_inst_t module_inst = get_module_inst(exec_env);
timer_ctx_t timer_ctx = get_wasm_timer_ctx(module_inst);
bh_assert(timer_ctx);
return sys_create_timer(timer_ctx, interval, is_period, auto_start);
}
void
wasm_timer_destroy(wasm_exec_env_t exec_env, timer_id_t timer_id)
{
wasm_module_inst_t module_inst = get_module_inst(exec_env);
timer_ctx_t timer_ctx = get_wasm_timer_ctx(module_inst);
bh_assert(timer_ctx);
sys_timer_destroy(timer_ctx, timer_id);
}
void
wasm_timer_cancel(wasm_exec_env_t exec_env, timer_id_t timer_id)
{
wasm_module_inst_t module_inst = get_module_inst(exec_env);
timer_ctx_t timer_ctx = get_wasm_timer_ctx(module_inst);
bh_assert(timer_ctx);
sys_timer_cancel(timer_ctx, timer_id);
}
void
wasm_timer_restart(wasm_exec_env_t exec_env, timer_id_t timer_id, int interval)
{
wasm_module_inst_t module_inst = get_module_inst(exec_env);
timer_ctx_t timer_ctx = get_wasm_timer_ctx(module_inst);
bh_assert(timer_ctx);
sys_timer_restart(timer_ctx, timer_id, interval);
}
uint32
wasm_get_sys_tick_ms(wasm_exec_env_t exec_env)
{
return (uint32)bh_get_tick_ms();
}
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