golang 网络编程之如何正确关闭tcp连接以及管理它的生命周期 socket

src/internal/poll/fd_unix.go:85

// Close closes the FD. The underlying file descriptor is closed by the
// destroy method when there are no remaining references.
func (fd *FD) Close() error {
   if !fd.fdmu.increfAndClose() {
      return errClosing(fd.isFile)
   }

   // Unblock any I/O.  Once it all unblocks and returns,
   // so that it cannot be referring to fd.sysfd anymore,
   // the final decref will close fd.sysfd. This should happen
   // fairly quickly, since all the I/O is non-blocking, and any
   // attempts to block in the pollDesc will return errClosing(fd.isFile).
   fd.pd.evict()

   // The call to decref will call destroy if there are no other
   // references.
   err := fd.decref()

   // Wait until the descriptor is closed. If this was the only
   // reference, it is already closed. Only wait if the file has
   // not been set to blocking mode, as otherwise any current I/O
   // may be blocking, and that would block the Close.
   // No need for an atomic read of isBlocking, increfAndClose means
   // we have exclusive access to fd.
   if fd.isBlocking == 0 {
      runtime_Semacquire(&fd.csema)
   }

   return err
}

 src/net/sock_posix.go

golang 网络编程之如何正确关闭tcp连接以及管理它的生命周期 - 就想叫yoko - 博客园 https://www.cnblogs.com/notokoy/p/11067932.html