在 C# 程序中避免这种竞争条件
我正在开发一个 C# 应用程序，在这里遇到一个奇怪的问题。我有一个用 C++ 构建的 .dll，我必须从 C# 应用程序调用该 .dll 中的一些函数。
考虑以下示例代码：
public partial class MainWindows: Window
{
public MainWindow()
{
InitializeComponent();
ConfigurationFunctions.StartMain(); //Start main is the DLL function in C++
int x = ConfigurationFunctions.ReturnIntExp();
StringBuilder sb = ConfigurationOptions.ReturnSomethingExp();
}
}
C++ .cpp 文件
EXPORT_API int xExp;
EXPORT_API char cExp;
EXPORT_API StartMain()
{
//Calculate `x` and `y` in this program values here and allocate to variables to be returned from function
xExp = x;
cExp = c;
}
EXPORT_API int ReturnIntExp()
{
return xExp;
}
EXPORT_API char ReturnSomethingExp()
{
return cExp;
}
问题是当我从 .dll 运行 StartMain() 函数时，它会计算 int< 的一些值/code> 和 char 必须分配给变量（实际上返回到 C# 应用程序）
但是，在 StartMain() 之后，C# 应用程序应该等到 StartMain()函数完成（在本例中大约需要 3-4 秒，并且 dll 本身会触发两个/三个其他进程），然后才继续进一步操作，否则变量 x 和 sb在 C# 应用程序中将有空/无意义的值。
在这种情况下我怎样才能达到同样的效果？
I am working on a C# application and facing a strange issue here. I have a .dll which has been built in C++, and I have to call some functions from this .dll from C# app.
Consider this sample code:
public partial class MainWindows: Window
{
public MainWindow()
{
InitializeComponent();
ConfigurationFunctions.StartMain(); //Start main is the DLL function in C++
int x = ConfigurationFunctions.ReturnIntExp();
StringBuilder sb = ConfigurationOptions.ReturnSomethingExp();
}
}
C++ .cpp file
EXPORT_API int xExp;
EXPORT_API char cExp;
EXPORT_API StartMain()
{
//Calculate `x` and `y` in this program values here and allocate to variables to be returned from function
xExp = x;
cExp = c;
}
EXPORT_API int ReturnIntExp()
{
return xExp;
}
EXPORT_API char ReturnSomethingExp()
{
return cExp;
}
The problem is when I run the StartMain() function from the .dll, it calculate some values for for int and char which have to be allocated to variables (that are actually returned to C# application)
But, after StartMain() the C# application should wait till the StartMain() function is complete (which in this case takes approx. 3-4 secs and the dll itself fires two/three other processes) and only then proceed further or else, the variables x and sb in C# application will have empty/meaningless values.
How can I achieve the same in this case?
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评论（1）
添加第三个导出变量
ReturnIsReady()，如果其他两个方法有有意义的数据，则返回true，否则返回false。然后简单地有一个带有睡眠的循环来检查该值，直到它发生变化。更好的选择是实现互斥体或类似的结构，但自旋等待对于启动时该长度的单次等待来说应该足够了。
或者，为什么
StartMain()在填写值之前返回？Add a third exported variable
ReturnIsReady()that returnstrueif the other two methods have meaningful data, andfalseotherwise. Then simply have a loop with a sleep to check that value until it changes.A better option would be to implement a mutex or similar structure, but spin waiting should be sufficient for a single wait of that length at start up.
Alternatively, why is
StartMain()returning before filling in the values?