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Main thread spread exception when thread-mgr is enabled (#1889)

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And refactor clear_wasi_proc_exit_exception, refer to
https://github.com/bytecodealliance/wasm-micro-runtime/pull/1869
This commit is contained in:
Xu Jun 2023-01-20 08:54:27 +08:00 committed by GitHub
parent cb7ac8fee3
commit cadf9d0ad3
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GPG Key ID: 4AEE18F83AFDEB23
10 changed files with 255 additions and 142 deletions
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34
core/iwasm/aot/aot_runtime.c
View File

@ -899,24 +899,6 @@ create_exports(AOTModuleInstance *module_inst, AOTModule *module,
return create_export_funcs(module_inst, module, error_buf, error_buf_size);
}
static bool
clear_wasi_proc_exit_exception(AOTModuleInstance *module_inst)
{
#if WASM_ENABLE_LIBC_WASI != 0
const char *exception = aot_get_exception(module_inst);
if (exception && !strcmp(exception, "Exception: wasi proc exit")) {
/* The "wasi proc exit" exception is thrown by native lib to
let wasm app exit, which is a normal behavior, we clear
the exception here. */
aot_set_exception(module_inst, NULL);
return true;
}
return false;
#else
return false;
#endif
}
static bool
execute_post_inst_function(AOTModuleInstance *module_inst)
{
@ -956,7 +938,6 @@ execute_start_function(AOTModuleInstance *module_inst)
u.f(exec_env);
wasm_exec_env_destroy(exec_env);
(void)clear_wasi_proc_exit_exception(module_inst);
return !aot_get_exception(module_inst);
}
@ -1407,13 +1388,6 @@ aot_call_function(WASMExecEnv *exec_env, AOTFunctionInstance *function,
ret = invoke_native_internal(exec_env, function->u.func.func_ptr,
func_type, NULL, NULL, argv1, argc, argv);
if (!ret || aot_get_exception(module_inst)) {
if (clear_wasi_proc_exit_exception(module_inst))
ret = true;
else
ret = false;
}
#if WASM_ENABLE_DUMP_CALL_STACK != 0
if (!ret) {
if (aot_create_call_stack(exec_env)) {
@ -1473,9 +1447,6 @@ aot_call_function(WASMExecEnv *exec_env, AOTFunctionInstance *function,
ret = invoke_native_internal(exec_env, function->u.func.func_ptr,
func_type, NULL, NULL, argv, argc, argv);
if (clear_wasi_proc_exit_exception(module_inst))
ret = true;
#if WASM_ENABLE_DUMP_CALL_STACK != 0
if (aot_get_exception(module_inst)) {
if (aot_create_call_stack(exec_env)) {
@ -1516,7 +1487,7 @@ aot_create_exec_env_and_call_function(AOTModuleInstance *module_inst,
}
}
ret = aot_call_function(exec_env, func, argc, argv);
ret = wasm_runtime_call_wasm(exec_env, func, argc, argv);
/* don't destroy the exec_env if it isn't created in this function */
if (!existing_exec_env)
@ -2006,9 +1977,6 @@ aot_call_indirect(WASMExecEnv *exec_env, uint32 tbl_idx, uint32 table_elem_idx,
}
fail:
if (clear_wasi_proc_exit_exception(module_inst))
return true;
#ifdef OS_ENABLE_HW_BOUND_CHECK
wasm_runtime_access_exce_check_guard_page();
#endif

3
core/iwasm/common/wasm_exec_env.c
View File

@ -181,6 +181,9 @@ wasm_exec_env_destroy(WASMExecEnv *exec_env)
the stopped thread will be overrided by other threads */
wasm_cluster_thread_exited(exec_env);
#endif
/* We have terminated other threads, this is the only alive thread, so
* we don't acquire cluster->lock because the cluster will be destroyed
* inside this function */
wasm_cluster_del_exec_env(cluster, exec_env);
}
#endif /* end of WASM_ENABLE_THREAD_MGR */

66
core/iwasm/common/wasm_runtime_common.c
View File

@ -1743,6 +1743,30 @@ wasm_runtime_finalize_call_function(WASMExecEnv *exec_env,
}
#endif
static bool
clear_wasi_proc_exit_exception(WASMModuleInstanceCommon *module_inst_comm)
{
#if WASM_ENABLE_LIBC_WASI != 0
const char *exception;
WASMModuleInstance *module_inst = (WASMModuleInstance *)module_inst_comm;
bh_assert(module_inst_comm->module_type == Wasm_Module_Bytecode
|| module_inst_comm->module_type == Wasm_Module_AoT);
exception = wasm_get_exception(module_inst);
if (exception && !strcmp(exception, "Exception: wasi proc exit")) {
/* The "wasi proc exit" exception is thrown by native lib to
let wasm app exit, which is a normal behavior, we clear
the exception here. */
wasm_set_exception(module_inst, NULL);
return true;
}
return false;
#else
return false;
#endif
}
bool
wasm_runtime_call_wasm(WASMExecEnv *exec_env,
WASMFunctionInstanceCommon *function, uint32 argc,
@ -1783,10 +1807,15 @@ wasm_runtime_call_wasm(WASMExecEnv *exec_env,
param_argc, new_argv);
#endif
if (!ret) {
if (new_argv != argv) {
wasm_runtime_free(new_argv);
if (clear_wasi_proc_exit_exception(exec_env->module_inst)) {
ret = true;
}
else {
if (new_argv != argv) {
wasm_runtime_free(new_argv);
}
return false;
}
return false;
}
#if WASM_ENABLE_REF_TYPES != 0
@ -2150,11 +2179,25 @@ wasm_runtime_get_exec_env_singleton(WASMModuleInstanceCommon *module_inst_comm)
void
wasm_set_exception(WASMModuleInstance *module_inst, const char *exception)
{
if (exception)
WASMExecEnv *exec_env = NULL;
if (exception) {
snprintf(module_inst->cur_exception, sizeof(module_inst->cur_exception),
"Exception: %s", exception);
else
}
else {
module_inst->cur_exception[0] = '\0';
}
#if WASM_ENABLE_THREAD_MGR != 0
exec_env =
wasm_clusters_search_exec_env((WASMModuleInstanceCommon *)module_inst);
if (exec_env) {
wasm_cluster_spread_exception(exec_env, exception ? false : true);
}
#else
(void)exec_env;
#endif
}
/* clang-format off */
@ -4179,6 +4222,8 @@ bool
wasm_runtime_call_indirect(WASMExecEnv *exec_env, uint32 element_indices,
uint32 argc, uint32 argv[])
{
bool ret = false;
if (!wasm_runtime_exec_env_check(exec_env)) {
LOG_ERROR("Invalid exec env stack info.");
return false;
@ -4190,13 +4235,18 @@ wasm_runtime_call_indirect(WASMExecEnv *exec_env, uint32 element_indices,
#if WASM_ENABLE_INTERP != 0
if (exec_env->module_inst->module_type == Wasm_Module_Bytecode)
return wasm_call_indirect(exec_env, 0, element_indices, argc, argv);
ret = wasm_call_indirect(exec_env, 0, element_indices, argc, argv);
#endif
#if WASM_ENABLE_AOT != 0
if (exec_env->module_inst->module_type == Wasm_Module_AoT)
return aot_call_indirect(exec_env, 0, element_indices, argc, argv);
ret = aot_call_indirect(exec_env, 0, element_indices, argc, argv);
#endif
return false;
if (!ret && clear_wasi_proc_exit_exception(exec_env->module_inst)) {
ret = true;
}
return ret;
}
static void

29
core/iwasm/interpreter/wasm_interp_classic.c
View File

@ -4015,24 +4015,6 @@ fast_jit_call_func_bytecode(WASMModuleInstance *module_inst,
#endif /* end of WASM_ENABLE_FAST_JIT != 0 */
#if WASM_ENABLE_JIT != 0
static bool
clear_wasi_proc_exit_exception(WASMModuleInstance *module_inst)
{
#if WASM_ENABLE_LIBC_WASI != 0
const char *exception = wasm_get_exception(module_inst);
if (exception && !strcmp(exception, "Exception: wasi proc exit")) {
/* The "wasi proc exit" exception is thrown by native lib to
let wasm app exit, which is a normal behavior, we clear
the exception here. */
wasm_set_exception(module_inst, NULL);
return true;
}
return false;
#else
return false;
#endif
}
static bool
llvm_jit_call_func_bytecode(WASMModuleInstance *module_inst,
WASMExecEnv *exec_env,
@ -4092,14 +4074,6 @@ llvm_jit_call_func_bytecode(WASMModuleInstance *module_inst,
ret = wasm_runtime_invoke_native(
exec_env, module_inst->func_ptrs[func_idx], func_type, NULL, NULL,
argv1, argc, argv);
if (!ret || wasm_get_exception(module_inst)) {
if (clear_wasi_proc_exit_exception(module_inst))
ret = true;
else
ret = false;
}
if (!ret) {
if (argv1 != argv1_buf)
wasm_runtime_free(argv1);
@ -4144,9 +4118,6 @@ llvm_jit_call_func_bytecode(WASMModuleInstance *module_inst,
exec_env, module_inst->func_ptrs[func_idx], func_type, NULL, NULL,
argv, argc, argv);
if (clear_wasi_proc_exit_exception(module_inst))
ret = true;
return ret && !wasm_get_exception(module_inst) ? true : false;
}
}

22
core/iwasm/interpreter/wasm_runtime.c
View File

@ -2033,24 +2033,6 @@ wasm_lookup_table(const WASMModuleInstance *module_inst, const char *name)
}
#endif
static bool
clear_wasi_proc_exit_exception(WASMModuleInstance *module_inst)
{
#if WASM_ENABLE_LIBC_WASI != 0
const char *exception = wasm_get_exception(module_inst);
if (exception && !strcmp(exception, "Exception: wasi proc exit")) {
/* The "wasi proc exit" exception is thrown by native lib to
let wasm app exit, which is a normal behavior, we clear
the exception here. */
wasm_set_exception(module_inst, NULL);
return true;
}
return false;
#else
return false;
#endif
}
#ifdef OS_ENABLE_HW_BOUND_CHECK
static void
@ -2160,7 +2142,6 @@ wasm_call_function(WASMExecEnv *exec_env, WASMFunctionInstance *function,
wasm_exec_env_set_thread_info(exec_env);
interp_call_wasm(module_inst, exec_env, function, argc, argv);
(void)clear_wasi_proc_exit_exception(module_inst);
return !wasm_get_exception(module_inst) ? true : false;
}
@ -2188,7 +2169,7 @@ wasm_create_exec_env_and_call_function(WASMModuleInstance *module_inst,
}
}
ret = wasm_call_function(exec_env, func, argc, argv);
ret = wasm_runtime_call_wasm(exec_env, func, argc, argv);
/* don't destroy the exec_env if it isn't created in this function */
if (!existing_exec_env)
@ -2458,7 +2439,6 @@ call_indirect(WASMExecEnv *exec_env, uint32 tbl_idx, uint32 elem_idx,
interp_call_wasm(module_inst, exec_env, func_inst, argc, argv);
(void)clear_wasi_proc_exit_exception(module_inst);
return !wasm_get_exception(module_inst) ? true : false;
got_exception:

3
core/iwasm/libraries/lib-pthread/lib_pthread_wrapper.c
View File

@ -520,8 +520,7 @@ pthread_start_routine(void *arg)
if (!wasm_runtime_call_indirect(exec_env, routine_args->elem_index, 1,
argv)) {
if (wasm_runtime_get_exception(module_inst))
wasm_cluster_spread_exception(exec_env);
/* Exception has already been spread during throwing */
}
/* destroy pthread key values */

184
core/iwasm/libraries/thread-mgr/thread_manager.c
View File

@ -76,6 +76,7 @@ traverse_list(bh_list *l, list_visitor visitor, void *user_data)
}
}
/* The caller must lock cluster->lock */
static bool
allocate_aux_stack(WASMCluster *cluster, uint32 *start, uint32 *size)
{
@ -86,7 +87,6 @@ allocate_aux_stack(WASMCluster *cluster, uint32 *start, uint32 *size)
if (!cluster->stack_segment_occupied)
return false;
os_mutex_lock(&cluster->lock);
for (i = 0; i < cluster_max_thread_num; i++) {
if (!cluster->stack_segment_occupied[i]) {
if (start)
@ -94,14 +94,14 @@ allocate_aux_stack(WASMCluster *cluster, uint32 *start, uint32 *size)
if (size)
*size = cluster->stack_size;
cluster->stack_segment_occupied[i] = true;
os_mutex_unlock(&cluster->lock);
return true;
}
}
os_mutex_unlock(&cluster->lock);
return false;
}
/* The caller must lock cluster->lock */
static bool
free_aux_stack(WASMCluster *cluster, uint32 start)
{
@ -109,9 +109,7 @@ free_aux_stack(WASMCluster *cluster, uint32 start)
for (i = 0; i < cluster_max_thread_num; i++) {
if (start == cluster->stack_tops[i]) {
os_mutex_lock(&cluster->lock);
cluster->stack_segment_occupied[i] = false;
os_mutex_unlock(&cluster->lock);
return true;
}
}
@ -265,20 +263,21 @@ wasm_exec_env_get_cluster(WASMExecEnv *exec_env)
return exec_env->cluster;
}
bool
/* The caller must lock cluster->lock */
static bool
wasm_cluster_add_exec_env(WASMCluster *cluster, WASMExecEnv *exec_env)
{
bool ret = true;
exec_env->cluster = cluster;
os_mutex_lock(&cluster->lock);
if (bh_list_insert(&cluster->exec_env_list, exec_env) != 0)
ret = false;
os_mutex_unlock(&cluster->lock);
return ret;
}
/* The caller should lock cluster->lock for thread safety */
bool
wasm_cluster_del_exec_env(WASMCluster *cluster, WASMExecEnv *exec_env)
{
@ -301,10 +300,8 @@ wasm_cluster_del_exec_env(WASMCluster *cluster, WASMExecEnv *exec_env)
}
#endif
os_mutex_lock(&cluster->lock);
if (bh_list_remove(&cluster->exec_env_list, exec_env) != 0)
ret = false;
os_mutex_unlock(&cluster->lock);
if (cluster->exec_env_list.len == 0) {
/* exec_env_list empty, destroy the cluster */
@ -374,6 +371,12 @@ wasm_cluster_spawn_exec_env(WASMExecEnv *exec_env)
return NULL;
}
os_mutex_lock(&cluster->lock);
if (cluster->has_exception || cluster->processing) {
goto fail1;
}
#if WASM_ENABLE_INTERP != 0
if (module_inst->module_type == Wasm_Module_Bytecode) {
stack_size =
@ -390,7 +393,7 @@ wasm_cluster_spawn_exec_env(WASMExecEnv *exec_env)
if (!(new_module_inst = wasm_runtime_instantiate_internal(
module, true, stack_size, 0, NULL, 0))) {
return NULL;
goto fail1;
}
/* Set custom_data to new module instance */
@ -405,32 +408,36 @@ wasm_cluster_spawn_exec_env(WASMExecEnv *exec_env)
new_exec_env = wasm_exec_env_create_internal(new_module_inst,
exec_env->wasm_stack_size);
if (!new_exec_env)
goto fail1;
goto fail2;
if (!allocate_aux_stack(cluster, &aux_stack_start, &aux_stack_size)) {
LOG_ERROR("thread manager error: "
"failed to allocate aux stack space for new thread");
goto fail2;
goto fail3;
}
/* Set aux stack for current thread */
if (!wasm_exec_env_set_aux_stack(new_exec_env, aux_stack_start,
aux_stack_size)) {
goto fail3;
goto fail4;
}
if (!wasm_cluster_add_exec_env(cluster, new_exec_env))
goto fail3;
goto fail4;
os_mutex_unlock(&cluster->lock);
return new_exec_env;
fail3:
fail4:
/* free the allocated aux stack space */
free_aux_stack(cluster, aux_stack_start);
fail2:
fail3:
wasm_exec_env_destroy(new_exec_env);
fail1:
fail2:
wasm_runtime_deinstantiate_internal(new_module_inst, true);
fail1:
os_mutex_unlock(&cluster->lock);
return NULL;
}
@ -443,8 +450,10 @@ wasm_cluster_destroy_spawned_exec_env(WASMExecEnv *exec_env)
bh_assert(cluster != NULL);
/* Free aux stack space */
os_mutex_lock(&cluster->lock);
free_aux_stack(cluster, exec_env->aux_stack_bottom.bottom);
wasm_cluster_del_exec_env(cluster, exec_env);
os_mutex_unlock(&cluster->lock);
wasm_exec_env_destroy_internal(exec_env);
wasm_runtime_deinstantiate_internal(module_inst, true);
@ -468,15 +477,18 @@ thread_manager_start_routine(void *arg)
#endif
/* Routine exit */
/* Free aux stack space */
free_aux_stack(cluster, exec_env->aux_stack_bottom.bottom);
/* Detach the native thread here to ensure the resources are freed */
wasm_cluster_detach_thread(exec_env);
#if WASM_ENABLE_DEBUG_INTERP != 0
wasm_cluster_thread_exited(exec_env);
#endif
/* Remove and destroy exec_env */
os_mutex_lock(&cluster->lock);
/* Free aux stack space */
free_aux_stack(cluster, exec_env->aux_stack_bottom.bottom);
/* Remove and exec_env */
wasm_cluster_del_exec_env(cluster, exec_env);
os_mutex_unlock(&cluster->lock);
/* destroy exec_env */
wasm_exec_env_destroy_internal(exec_env);
os_thread_exit(ret);
@ -496,25 +508,31 @@ wasm_cluster_create_thread(WASMExecEnv *exec_env,
cluster = wasm_exec_env_get_cluster(exec_env);
bh_assert(cluster);
os_mutex_lock(&cluster->lock);
if (cluster->has_exception || cluster->processing) {
goto fail1;
}
new_exec_env =
wasm_exec_env_create_internal(module_inst, exec_env->wasm_stack_size);
if (!new_exec_env)
return -1;
goto fail1;
if (!allocate_aux_stack(cluster, &aux_stack_start, &aux_stack_size)) {
LOG_ERROR("thread manager error: "
"failed to allocate aux stack space for new thread");
goto fail1;
goto fail2;
}
/* Set aux stack for current thread */
if (!wasm_exec_env_set_aux_stack(new_exec_env, aux_stack_start,
aux_stack_size)) {
goto fail2;
goto fail3;
}
if (!wasm_cluster_add_exec_env(cluster, new_exec_env))
goto fail2;
goto fail3;
new_exec_env->thread_start_routine = thread_routine;
new_exec_env->thread_arg = arg;
@ -523,18 +541,23 @@ wasm_cluster_create_thread(WASMExecEnv *exec_env,
!= os_thread_create(&tid, thread_manager_start_routine,
(void *)new_exec_env,
APP_THREAD_STACK_SIZE_DEFAULT)) {
goto fail3;
goto fail4;
}
os_mutex_unlock(&cluster->lock);
return 0;
fail3:
fail4:
wasm_cluster_del_exec_env(cluster, new_exec_env);
fail2:
fail3:
/* free the allocated aux stack space */
free_aux_stack(cluster, aux_stack_start);
fail1:
fail2:
wasm_exec_env_destroy(new_exec_env);
fail1:
os_mutex_unlock(&cluster->lock);
return -1;
}
@ -765,17 +788,30 @@ wasm_cluster_exit_thread(WASMExecEnv *exec_env, void *retval)
wasm_cluster_thread_exited(exec_env);
#endif
/* App exit the thread, free the resources before exit native thread */
/* Free aux stack space */
free_aux_stack(cluster, exec_env->aux_stack_bottom.bottom);
/* Detach the native thread here to ensure the resources are freed */
wasm_cluster_detach_thread(exec_env);
os_mutex_lock(&cluster->lock);
/* Free aux stack space */
free_aux_stack(cluster, exec_env->aux_stack_bottom.bottom);
/* Remove and destroy exec_env */
wasm_cluster_del_exec_env(cluster, exec_env);
os_mutex_unlock(&cluster->lock);
wasm_exec_env_destroy_internal(exec_env);
os_thread_exit(retval);
}
static void
set_thread_cancel_flags(WASMExecEnv *exec_env)
{
/* Set the termination flag */
#if WASM_ENABLE_DEBUG_INTERP != 0
wasm_cluster_thread_send_signal(exec_env, WAMR_SIG_TERM);
#else
exec_env->suspend_flags.flags |= 0x01;
#endif
}
int32
wasm_cluster_cancel_thread(WASMExecEnv *exec_env)
{
@ -787,12 +823,8 @@ wasm_cluster_cancel_thread(WASMExecEnv *exec_env)
}
os_mutex_unlock(&cluster_list_lock);
/* Set the termination flag */
#if WASM_ENABLE_DEBUG_INTERP != 0
wasm_cluster_thread_send_signal(exec_env, WAMR_SIG_TERM);
#else
exec_env->suspend_flags.flags |= 0x01;
#endif
set_thread_cancel_flags(exec_env);
return 0;
}
@ -812,15 +844,31 @@ terminate_thread_visitor(void *node, void *user_data)
void
wasm_cluster_terminate_all(WASMCluster *cluster)
{
os_mutex_lock(&cluster->lock);
cluster->processing = true;
os_mutex_unlock(&cluster->lock);
traverse_list(&cluster->exec_env_list, terminate_thread_visitor, NULL);
os_mutex_lock(&cluster->lock);
cluster->processing = false;
os_mutex_unlock(&cluster->lock);
}
void
wasm_cluster_terminate_all_except_self(WASMCluster *cluster,
WASMExecEnv *exec_env)
{
os_mutex_lock(&cluster->lock);
cluster->processing = true;
os_mutex_unlock(&cluster->lock);
traverse_list(&cluster->exec_env_list, terminate_thread_visitor,
(void *)exec_env);
os_mutex_lock(&cluster->lock);
cluster->processing = false;
os_mutex_unlock(&cluster->lock);
}
static void
@ -838,15 +886,31 @@ wait_for_thread_visitor(void *node, void *user_data)
void
wams_cluster_wait_for_all(WASMCluster *cluster)
{
os_mutex_lock(&cluster->lock);
cluster->processing = true;
os_mutex_unlock(&cluster->lock);
traverse_list(&cluster->exec_env_list, wait_for_thread_visitor, NULL);
os_mutex_lock(&cluster->lock);
cluster->processing = false;
os_mutex_unlock(&cluster->lock);
}
void
wasm_cluster_wait_for_all_except_self(WASMCluster *cluster,
WASMExecEnv *exec_env)
{
os_mutex_lock(&cluster->lock);
cluster->processing = true;
os_mutex_unlock(&cluster->lock);
traverse_list(&cluster->exec_env_list, wait_for_thread_visitor,
(void *)exec_env);
os_mutex_lock(&cluster->lock);
cluster->processing = false;
os_mutex_unlock(&cluster->lock);
}
bool
@ -885,15 +949,19 @@ suspend_thread_visitor(void *node, void *user_data)
void
wasm_cluster_suspend_all(WASMCluster *cluster)
{
os_mutex_lock(&cluster->lock);
traverse_list(&cluster->exec_env_list, suspend_thread_visitor, NULL);
os_mutex_unlock(&cluster->lock);
}
void
wasm_cluster_suspend_all_except_self(WASMCluster *cluster,
WASMExecEnv *exec_env)
{
os_mutex_lock(&cluster->lock);
traverse_list(&cluster->exec_env_list, suspend_thread_visitor,
(void *)exec_env);
os_mutex_unlock(&cluster->lock);
}
void
@ -914,7 +982,9 @@ resume_thread_visitor(void *node, void *user_data)
void
wasm_cluster_resume_all(WASMCluster *cluster)
{
os_mutex_lock(&cluster->lock);
traverse_list(&cluster->exec_env_list, resume_thread_visitor, NULL);
os_mutex_unlock(&cluster->lock);
}
static void
@ -923,24 +993,46 @@ set_exception_visitor(void *node, void *user_data)
WASMExecEnv *curr_exec_env = (WASMExecEnv *)node;
WASMExecEnv *exec_env = (WASMExecEnv *)user_data;
WASMModuleInstanceCommon *module_inst = get_module_inst(exec_env);
WASMModuleInstanceCommon *curr_module_inst = get_module_inst(curr_exec_env);
const char *exception = wasm_runtime_get_exception(module_inst);
/* skip "Exception: " */
exception += 11;
WASMModuleInstance *wasm_inst = (WASMModuleInstance *)module_inst;
if (curr_exec_env != exec_env) {
curr_module_inst = get_module_inst(curr_exec_env);
wasm_runtime_set_exception(curr_module_inst, exception);
WASMModuleInstance *curr_wasm_inst =
(WASMModuleInstance *)get_module_inst(curr_exec_env);
bh_memcpy_s(curr_wasm_inst->cur_exception,
sizeof(curr_wasm_inst->cur_exception),
wasm_inst->cur_exception, sizeof(wasm_inst->cur_exception));
/* Terminate the thread so it can exit from dead loops */
set_thread_cancel_flags(curr_exec_env);
}
}
static void
clear_exception_visitor(void *node, void *user_data)
{
WASMExecEnv *exec_env = (WASMExecEnv *)user_data;
WASMExecEnv *curr_exec_env = (WASMExecEnv *)node;
if (curr_exec_env != exec_env) {
WASMModuleInstance *curr_wasm_inst =
(WASMModuleInstance *)get_module_inst(curr_exec_env);
curr_wasm_inst->cur_exception[0] = '\0';
}
}
void
wasm_cluster_spread_exception(WASMExecEnv *exec_env)
wasm_cluster_spread_exception(WASMExecEnv *exec_env, bool clear)
{
WASMCluster *cluster = wasm_exec_env_get_cluster(exec_env);
bh_assert(cluster);
traverse_list(&cluster->exec_env_list, set_exception_visitor, exec_env);
os_mutex_lock(&cluster->lock);
cluster->has_exception = !clear;
traverse_list(&cluster->exec_env_list,
clear ? clear_exception_visitor : set_exception_visitor,
exec_env);
os_mutex_unlock(&cluster->lock);
}
static void
@ -968,7 +1060,9 @@ wasm_cluster_spread_custom_data(WASMModuleInstanceCommon *module_inst,
cluster = wasm_exec_env_get_cluster(exec_env);
bh_assert(cluster);
os_mutex_lock(&cluster->lock);
traverse_list(&cluster->exec_env_list, set_custom_data_visitor,
custom_data);
os_mutex_unlock(&cluster->lock);
}
}

17
core/iwasm/libraries/thread-mgr/thread_manager.h
View File

@ -34,6 +34,18 @@ struct WASMCluster {
uint32 stack_size;
/* Record which segments are occupied */
bool *stack_segment_occupied;
/* When has_exception == true, this cluster should refuse any spawn thread
* requests, this flag can be cleared by calling
* wasm_runtime_clear_exception on instances of any threads of this cluster
*/
bool has_exception;
/* When processing is true, this cluster should refuse any spawn thread
* requests. This is a short-lived state, must be cleared immediately once
* the processing finished.
* This is used to avoid dead lock when one thread waiting another thread
* with lock, see wams_cluster_wait_for_all and wasm_cluster_terminate_all
*/
bool processing;
#if WASM_ENABLE_DEBUG_INTERP != 0
WASMDebugInstance *debug_inst;
#endif
@ -113,9 +125,6 @@ void
wasm_cluster_wait_for_all_except_self(WASMCluster *cluster,
WASMExecEnv *exec_env);
bool
wasm_cluster_add_exec_env(WASMCluster *cluster, WASMExecEnv *exec_env);
bool
wasm_cluster_del_exec_env(WASMCluster *cluster, WASMExecEnv *exec_env);
@ -123,7 +132,7 @@ WASMExecEnv *
wasm_clusters_search_exec_env(WASMModuleInstanceCommon *module_inst);
void
wasm_cluster_spread_exception(WASMExecEnv *exec_env);
wasm_cluster_spread_exception(WASMExecEnv *exec_env, bool clear);
WASMExecEnv *
wasm_cluster_spawn_exec_env(WASMExecEnv *exec_env);

3
samples/multi-thread/wasm-apps/CMakeLists.txt
View File

@ -38,3 +38,6 @@ set (CMAKE_EXE_LINKER_FLAGS
add_executable(test.wasm main.c)
target_link_libraries(test.wasm)
add_executable(main_thread_exception.wasm main_thread_exception.c)
target_link_libraries(main_thread_exception.wasm)

36
samples/multi-thread/wasm-apps/main_thread_exception.c Normal file
View File

@ -0,0 +1,36 @@
/*
* Copyright (C) 2019 Intel Corporation. All rights reserved.
* SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
*/
#include <stdio.h>
#include <pthread.h>
typedef struct ThreadArgs {
int start;
int length;
} ThreadArgs;
void *
thread(void *args)
{
while (1) {
/* When other threads (including main thread) throw exception,
this thread can successfully exit the dead loop */
}
}
int
main()
{
pthread_t tids;
if (pthread_create(&tids, NULL, thread, NULL) != 0) {
printf("pthread_create failed\n");
}
/* Trigger an exception */
__builtin_trap();
return 0;
}