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Fix/Simplify the atomic.wait/nofity implementations (#2044)

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Use the shared memory's shared_mem_lock to lock the whole atomic.wait and
atomic.notify processes, and use it for os_cond_reltimedwait and os_cond_notify,
so as to make the whole processes actual atomic operations:
the original implementation accesses the wait address with shared_mem_lock
and uses wait_node->wait_lock for os_cond_reltimedwait, which is not an atomic
operation.

And remove the unnecessary wait_map_lock and wait_lock, since the whole
processes are already locked by shared_mem_lock.
This commit is contained in:
Wenyong Huang
2023-03-23 09:21:16 +08:00
committed by GitHub
parent ea50bd2aca
commit 49d439a3bc
5 changed files with 107 additions and 164 deletions
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8
core/iwasm/interpreter/wasm_interp_fast.c
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@ -3252,7 +3252,8 @@ wasm_interp_call_func_bytecode(WASMModuleInstance *module,
ret = wasm_runtime_atomic_notify(
(WASMModuleInstanceCommon *)module, maddr,
notify_count);
bh_assert((int32)ret >= 0);
if (ret == (uint32)-1)
goto got_exception;
PUSH_I32(ret);
break;
@ -3307,7 +3308,7 @@ wasm_interp_call_func_bytecode(WASMModuleInstance *module,
}
case WASM_OP_ATOMIC_FENCE:
{
os_atomic_thread_fence(os_memory_order_release);
os_atomic_thread_fence(os_memory_order_seq_cst);
break;
}
@ -3555,9 +3556,8 @@ wasm_interp_call_func_bytecode(WASMModuleInstance *module,
os_mutex_lock(&node->shared_mem_lock);
readv = (uint64)LOAD_I64(maddr);
if (readv == expect) {
if (readv == expect)
STORE_I64(maddr, sval);
}
os_mutex_unlock(&node->shared_mem_lock);
}
PUSH_I64(readv);