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Add lock to protect the operations of accessing exec env (#1991)

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Data race may occur when accessing exec_env's fields, e.g. suspend_flags
and handle. Add lock `exec_env->wait_lock` for them to resolve the issue.
This commit is contained in:
Enrico Loparco 2023-02-27 12:53:41 +01:00 committed by GitHub
parent 38c67b3f48
commit 52e26e59cf
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
5 changed files with 31 additions and 4 deletions
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7
core/iwasm/common/wasm_exec_env.c
View File

@ -208,10 +208,17 @@ void
wasm_exec_env_set_thread_info(WASMExecEnv *exec_env)
{
uint8 *stack_boundary = os_thread_get_stack_boundary();
#if WASM_ENABLE_THREAD_MGR != 0
os_mutex_lock(&exec_env->wait_lock);
#endif
exec_env->handle = os_self_thread();
exec_env->native_stack_boundary =
stack_boundary ? stack_boundary + WASM_STACK_GUARD_SIZE : NULL;
exec_env->native_stack_top_min = (void *)UINTPTR_MAX;
#if WASM_ENABLE_THREAD_MGR != 0
os_mutex_unlock(&exec_env->wait_lock);
#endif
}
#if WASM_ENABLE_THREAD_MGR != 0

6
core/iwasm/interpreter/wasm_interp_classic.c
View File

@ -1036,20 +1036,25 @@ wasm_interp_call_func_import(WASMModuleInstance *module_inst,
#if WASM_ENABLE_DEBUG_INTERP != 0
#define CHECK_SUSPEND_FLAGS() \
do { \
os_mutex_lock(&exec_env->wait_lock); \
if (IS_WAMR_TERM_SIG(exec_env->current_status->signal_flag)) { \
os_mutex_unlock(&exec_env->wait_lock); \
return; \
} \
if (IS_WAMR_STOP_SIG(exec_env->current_status->signal_flag)) { \
SYNC_ALL_TO_FRAME(); \
wasm_cluster_thread_waiting_run(exec_env); \
} \
os_mutex_unlock(&exec_env->wait_lock); \
} while (0)
#else
#define CHECK_SUSPEND_FLAGS() \
do { \
os_mutex_lock(&exec_env->wait_lock); \
if (exec_env->suspend_flags.flags != 0) { \
if (exec_env->suspend_flags.flags & 0x01) { \
/* terminate current thread */ \
os_mutex_unlock(&exec_env->wait_lock); \
return; \
} \
while (exec_env->suspend_flags.flags & 0x02) { \
@ -1057,6 +1062,7 @@ wasm_interp_call_func_import(WASMModuleInstance *module_inst,
os_cond_wait(&exec_env->wait_cond, &exec_env->wait_lock); \
} \
} \
os_mutex_unlock(&exec_env->wait_lock); \
} while (0)
#endif /* WASM_ENABLE_DEBUG_INTERP */
#endif /* WASM_ENABLE_THREAD_MGR */

3
core/iwasm/interpreter/wasm_interp_fast.c
View File

@ -1054,13 +1054,16 @@ wasm_interp_call_func_import(WASMModuleInstance *module_inst,
#if WASM_ENABLE_THREAD_MGR != 0
#define CHECK_SUSPEND_FLAGS() \
do { \
os_mutex_lock(&exec_env->wait_lock); \
if (exec_env->suspend_flags.flags != 0) { \
if (exec_env->suspend_flags.flags & 0x01) { \
/* terminate current thread */ \
os_mutex_unlock(&exec_env->wait_lock); \
return; \
} \
/* TODO: support suspend and breakpoint */ \
} \
os_mutex_unlock(&exec_env->wait_lock); \
} while (0)
#endif

3
core/iwasm/libraries/lib-wasi-threads/lib_wasi_threads_wrapper.c
View File

@ -123,19 +123,16 @@ thread_spawn_wrapper(wasm_exec_env_t exec_env, uint32 start_arg)
thread_start_arg->arg = start_arg;
thread_start_arg->start_func = start_func;
os_mutex_lock(&exec_env->wait_lock);
ret = wasm_cluster_create_thread(exec_env, new_module_inst, false,
thread_start, thread_start_arg);
if (ret != 0) {
LOG_ERROR("Failed to spawn a new thread");
goto thread_spawn_fail;
}
os_mutex_unlock(&exec_env->wait_lock);
return thread_id;
thread_spawn_fail:
os_mutex_unlock(&exec_env->wait_lock);
deallocate_thread_id(thread_id);
thread_preparation_fail:

16
core/iwasm/libraries/thread-mgr/thread_manager.c
View File

@ -574,12 +574,16 @@ thread_manager_start_routine(void *arg)
bh_assert(cluster != NULL);
bh_assert(module_inst != NULL);
os_mutex_lock(&exec_env->wait_lock);
exec_env->handle = os_self_thread();
os_mutex_unlock(&exec_env->wait_lock);
ret = exec_env->thread_start_routine(exec_env);
#ifdef OS_ENABLE_HW_BOUND_CHECK
os_mutex_lock(&exec_env->wait_lock);
if (exec_env->suspend_flags.flags & 0x08)
ret = exec_env->thread_ret_value;
os_mutex_unlock(&exec_env->wait_lock);
#endif
/* Routine exit */
@ -854,8 +858,11 @@ wasm_cluster_join_thread(WASMExecEnv *exec_env, void **ret_val)
os_mutex_unlock(&cluster_list_lock);
return 0;
}
os_mutex_lock(&exec_env->wait_lock);
exec_env->wait_count++;
handle = exec_env->handle;
os_mutex_unlock(&exec_env->wait_lock);
os_mutex_unlock(&exec_env->cluster->lock);
os_mutex_unlock(&cluster_list_lock);
@ -936,12 +943,14 @@ wasm_cluster_exit_thread(WASMExecEnv *exec_env, void *retval)
static void
set_thread_cancel_flags(WASMExecEnv *exec_env)
{
os_mutex_lock(&exec_env->wait_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
os_mutex_unlock(&exec_env->wait_lock);
}
int32
@ -1209,5 +1218,10 @@ wasm_cluster_spread_custom_data(WASMModuleInstanceCommon *module_inst,
bool
wasm_cluster_is_thread_terminated(WASMExecEnv *exec_env)
{
return (exec_env->suspend_flags.flags & 0x01) ? true : false;
os_mutex_lock(&exec_env->wait_lock);
bool is_thread_terminated =
(exec_env->suspend_flags.flags & 0x01) ? true : false;
os_mutex_unlock(&exec_env->wait_lock);
return is_thread_terminated;
}