ç回调和非围棋线程

问题描述

1. 如何从线程用C一个呼叫转到code，它不是由围棋产生的？


2. 我怎么分配给一个C函数指针，这样不会被转到创建的线程可以调用该指针，进入围棋code？

• 我不希望使用痛饮。


• 的回调将线程进入以前没有见过到来。无论是 CGO /生活，也没有任何东西包装/运行演示此行为AFAICT。

Update0

• I don't want to use SWIG.
• The callbacks will be coming from threads Go hasn't seen before. Neither cgo/life nor anything in pkg/runtime demonstrates this behaviour AFAICT.

推荐答案

您可以这样做，但解决方案是相对较慢（大约每次通话22μs我的机器上）。
答案是为C code用C线与原语将实际运行回调的另一个够程进行通信。

You can do this, but the solution is relatively slow (about 22µs per call on my machine).The answer is for the C code to use C thread primitives to communicate with another goroutine that will actually run the callback.

我创建了一个围棋包提供此功能：的。
有一个例子包证明其使用的。示例说明从转到运行之外创建一个线程回调到任意转到关闭。另一个例子是。这说明一个典型的C回调接口和层在它上面一个围棋回调。

I have created a Go package that provides this functionality: rog-go.googlecode.com/hg/exp/callback.There is an example package demonstrating its use here. The example demonstrates a call back to an arbitrary Go closure from a thread created outside of the Go runtime. Another example is here. This demonstrates a typical C callback interface and layers a Go callback on top of it.

要尝试的第一个例子：

goinstall rog-go.googlecode.com/hg/exp/example/looper
cd $GOROOT/src/pkg/rog-go.googlecode.com/hg/exp/example/looper
gotest

要尝试第二个例子：

goinstall rog-go.googlecode.com/hg/exp/example/event
cd $GOROOT/src/pkg/rog-go.googlecode.com/hg/exp/example/event
gotest

这两个例子都假设pthreads的是可用的。当然，这只是一个权宜之计，直到CGO是固定的，但对于任意调用关闭围棋在C回调将适用即使在当时的技术。

Both examples assume that pthreads are available. Of course, this is just a stop-gap measure until cgo is fixed, but the technique for calling arbitrary Go closures in a C callback will be applicable even then.

下面是回调包的文档：

PACKAGE

package callback
import "rog-go.googlecode.com/hg/exp/callback"

变量

var Func = callbackFunc

Func键存放一个指针到C回调函数。
在调用时，它调用在所提供的函数f
围棋方面与给定的参数。

Func holds a pointer to the C callback function.When called, it calls the provided function f in aa Go context with the given argument.

它可以通过首先将其转换为一个函数指针被用于
然后从C主叫
下面是设置了回调函数的例子：

It can be used by first converting it to a function pointerand then calling from C.Here is an example that sets up the callback function:

//static void (*callback)(void (*f)(void*), void *arg);
//void setCallback(void *c){
//  callback = c;
//}
import "C"
import "rog-go.googlecode.com/hg/exp/callback"

func init() {
    C.setCallback(callback.Func)
}

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