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c++ - 将函数简单生成为 std::thread

问题描述

同志们！

为了检查 gcc 将生成的代码，我正在尝试做一些多线程的东西。一个简化的测试用例在这里：

#include <iostream>
#include <thread>

int  n;
void embiggen(void) { ++n; }

void foo(void)
{
  std::thread t1(embiggen);
  t1.join();
  std::cout << "n = " << n << '\n';
};

当然，这会产生此故障：

/xtools/aarch64-unknown-elf/bin/aarch64-unknown-elf-g++ -ggdb3 -std=c++11 -Wall -Wextra -Wno-unused-parameter -O0 -lpthread -march=armv8.1-a foo.cc -c foo.o;
foo.cc: In function 'void foo()':
foo.cc:9:26: error: no matching function for call to 'std::thread::thread(void (&)())'
    9 |   std::thread t1(embiggen);
      |                          ^
/xtools/aarch64-unknown-elf/aarch64-unknown-elf/include/c++/11.1.0/bits/std_thread.h:157:5: note: candidate: 'std::thread::thread(std::thread&&)'
  157 |     thread(thread&& __t) noexcept
      |     ^~~~~~
/xtools/aarch64-unknown-elf/aarch64-unknown-elf/include/c++/11.1.0/bits/std_thread.h:157:21: note:   no known conversion for argument 1 from 'void()' to 'std::thread&&'
  157 |     thread(thread&& __t) noexcept
      |            ~~~~~~~~~^~~
/xtools/aarch64-unknown-elf/aarch64-unknown-elf/include/c++/11.1.0/bits/std_thread.h:121:5: note: candidate: 'std::thread::thread()'
  121 |     thread() noexcept = default;
      |     ^~~~~~
/xtools/aarch64-unknown-elf/aarch64-unknown-elf/include/c++/11.1.0/bits/std_thread.h:121:5: note:   candidate expects 0 arguments, 1 provided

我相信我已经尝试过这样的代码，而这无济于事。

问：将函数生成为单独线程的咒语是什么？

编辑：我正在使用gcc-11.1.0.

EDIT2：我的编译器是由crosstool-NGwith创建的CT_THREADS="none"。我想这就是凶手...

标签： c++multithreadingc++11

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