[英]How can I generate a compile-time array of interrupt handlers in C++?
I'd like to be able to write my ISR in one place: 我希望能够在一个地方编写我的ISR:
some_collection TimerHandlers;
// added to ISR table in linker script
void rawTimerIRQHandler() {
call_each_handler_in(handlers);
}
Such that I can then register handlers in other files 这样我就可以在其他文件中注册处理程序
// file1.cpp
void ledTimerHandler1() {
}
register(ledTimerHandler1); //or in an init function if not possible here
// file2.cpp
void ledTimerHandler2() {
}
register(ledTimerHandler2); //or in an init function if not possible here
And when the hardware jumps to rawTimerIRQHandler
, it executes ledTimerHandler1
and ledTimerHandler2
in some arbitrary order. 当硬件跳转到rawTimerIRQHandler
,它将以任意顺序执行ledTimerHandler1
和ledTimerHandler2
。
Obviously, I can implement this using something similar to a vector<void(*)()>
, but since the number of these handlers is known at compile-time, is there any way I can generate an array (or template linked list) at compile-time? 显然,我可以使用类似于vector<void(*)()>
来实现此目的,但是由于这些处理程序的数量在编译时是已知的,因此有什么方法可以生成数组(或模板链接列表)在编译时? I'd like to avoid the dynamic memory allocation that comes with vector
. 我想避免vector
附带的动态内存分配。
I'm open to using template<>
, #define
, or even GCC-specific attributes to acheive this goal. 我愿意使用template<>
,# #define
甚至GCC特定的属性来实现此目标。
The scaffolding's a bit tedious but once it's done the usage couldn't be simpler: 脚手架有点乏味,但是一旦完成,使用起来再简单不过了:
// example.h:
#include "Registered.h"
struct example : Registered<example> {};
// main.cc:
#include <iostream>
#include "example.h"
int main ()
{
for ( auto p = example::registry; p; p=p->chain )
std::cout << p << '\n';
}
// Registered.h :
template<class registered>
struct Registered {
static registered *registry;
registered *chain;
Registered() : chain(registry) {registry=static_cast<registered*>(this);}
};
// example.cc:
#include "example.h"
template<> example *Registered<example>::registry = 0;
static struct example first, second, third; // these can be defined anywhere w/ static duration
edit: moved the first,second,third
declaration/definitions to satisfy my inner pedant 编辑:移动first,second,third
声明/定义,以满足我的内心学究
Absolutley. 绝对的。 If I understand correctly, you just want a fixed array of function pointers to your handlers. 如果我理解正确,则只需要指向处理程序的固定函数指针数组即可。 Using C++11 syntax, and assuming 3 handlers just for the sake of the example, 使用C ++ 11语法,并仅出于示例目的假设3个处理程序,
#include <array>
const std::array<HandlerPtr, 3> handlers= {&ledTimerHandler1, &ledTimerHandler2, &ledTimerHandler3};
or using more classic C/C++ syntax 或使用更经典的C / C ++语法
const HandlerPtr handlers[] = {&ledTimerHandler1, &ledTimerHandler2, &ledTimerHandler3};
Based off jthill's answer, here's what I'll probably end up using (since I don't need a generic form): 根据jthill的回答,以下是我可能最终会使用的内容(因为我不需要通用形式):
struct timer_handler {
static timer_handler *first = 0;
timer_handler *next;
void (*f)();
public:
timer_handler(void (*f)()) : next(first), f(f) { first = this;}
// connect this to the interrupt vector
static inline void executeAll() {
auto p = first;
while(p) {
p->f();
p = p->next;
}
}
};
//a.cpp
void foo() {
}
timer_handler tfoo = foo;
//b.cpp
void bar() {
}
timer_handler tbar = bar;
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