diff --git a/quickjs.c b/quickjs.c index 19fcf1b..9cac6de 100644 --- a/quickjs.c +++ b/quickjs.c @@ -55047,6 +55047,32 @@ static js_mutex_t js_atomics_mutex; static struct list_head js_atomics_waiter_list = LIST_HEAD_INIT(js_atomics_waiter_list); +// no-op: Atomics.pause() is not allowed to block or yield to another +// thread, only to hint the CPU that it should back off for a bit; +// the amount of work we do here is a good enough substitute +static JSValue js_atomics_pause(JSContext *ctx, JSValue this_obj, + int argc, JSValue *argv) +{ + double d; + + if (argc > 0) { + switch (JS_VALUE_GET_TAG(argv[0])) { + case JS_TAG_FLOAT64: // accepted if and only if fraction == 0.0 + d = JS_VALUE_GET_FLOAT64(argv[0]); + if (isfinite(d)) + if (0 == modf(d, &d)) + break; + // fallthru + default: + return JS_ThrowTypeError(ctx, "not an integral number"); + case JS_TAG_UNDEFINED: + case JS_TAG_INT: + break; + } + } + return JS_UNDEFINED; +} + static JSValue js_atomics_wait(JSContext *ctx, JSValue this_obj, int argc, JSValue *argv) @@ -55176,6 +55202,7 @@ static const JSCFunctionListEntry js_atomics_funcs[] = { JS_CFUNC_MAGIC_DEF("load", 2, js_atomics_op, ATOMICS_OP_LOAD ), JS_CFUNC_DEF("store", 3, js_atomics_store ), JS_CFUNC_DEF("isLockFree", 1, js_atomics_isLockFree ), + JS_CFUNC_DEF("pause", 0, js_atomics_pause ), JS_CFUNC_DEF("wait", 4, js_atomics_wait ), JS_CFUNC_DEF("notify", 3, js_atomics_notify ), JS_PROP_STRING_DEF("[Symbol.toStringTag]", "Atomics", JS_PROP_CONFIGURABLE ), diff --git a/test262.conf b/test262.conf index a4d4841..ecb09e9 100644 --- a/test262.conf +++ b/test262.conf @@ -64,7 +64,7 @@ async-functions async-iteration # atomics are broken in recent versions of tcc Atomics=!tcc -Atomics.pause=skip +Atomics.pause=!tcc Atomics.waitAsync=skip BigInt caller