javascript - UnhandledPromiseRejectionWarning：类型错误：函数。原型。apply 被调用 #<object>, which is a ob ject and not a function - Discord Js <div id="body"><p>Hey when I use my discordjs bot I am receiving an error, but I don't know how I can solve it, I don't find in which line

Is there a mutex?

If two threads in C use stdio.h is there any "mutex" behind the scenes that handles contentions on the filehandle?

C 2018 7.21 7 says:

Each stream has an associated lock that is used to prevent data races when multiple threads of execution access a stream, and to restrict the interleaving of stream operations performed by multiple threads. Only one thread may hold this lock at a time. The lock is reentrant: a single thread may hold the lock multiple times at a given time.

Does a single-threaded application not have a mutex?

Moreover, if you compile a single-threaded C application, does the behavior of these stdio magically change and optimize away the mutex?

The C standard permits a C implementation to do this, because 5.1.2.3 6 says a C implementation only has to produce the observable behavior resulting from a program that behaves as specified in the standard, not that it has to implement a program in the ways described in the standard. I am unaware of whether any C implementations do this. Since modules using <stdio.h> may be compiled separately from modules that create threads and then call the former modules, this selection could not be made at compile time unless requested by the user (perhaps by a command-line switch or a #pragma directive). It would have to be done at link time (perhaps by linking in a single-threaded version of the standard library) or run time (perhaps by not using any locks until a thread had been spawned).

标签： javascriptdiscorddiscord.js

javascript - UnhandledPromiseRejectionWarning：类型错误：函数。原型。apply 被调用 #

问题描述

Is there a mutex?

Does a single-threaded application not have a mutex?

解决方案

推荐阅读