一個函數里兩個setjmp
We can call this function as an advance version of goto statement but with more dynamic range. The longjump() function allows us to pass parameters to know that the control has been jumped or not.
我們可以將此函數稱為goto語句的高級版本，但具有更大的動態范圍。 longjump()函數使我們可以傳遞參數來知道控件是否已跳轉。
So how to use this is the question. First thing is to decide point from where you want to jump and then decide to where you want to jump.
因此，如何使用此問題。 第一件事是確定要從哪里跳轉的點，然后再確定要跳轉的位置。
Before setting these point just make a jum_buf object. Now rest is a cake walk. In this example, I have put the point from where we want to jump inside a function called func by calling the function longjmp(a, 1) with two parameters as the jum_buf object and 1 will be return at the setjump call.
在設置這些點之前，只需創建一個jum_buf對象。 現在休息是輕輕松松。 在此示例中，我通過調用帶有兩個參數的longjmp(a，1)函數作為jum_buf對象，將要從其中跳轉到函數func的位置，在setjump調用中將返回1。
Call the function setjmp() at the point to where you want to jump. The Second parameter from the longjump will be stored in z. This z can be then checked for loops or maybe something else.
在要跳轉的位置調用函數setjmp() 。 longjump中的第二個參數將存儲在z中 。 然后可以檢查此z的循環或其他內容。
setjmp.h- longjmp()函數在C中的示例 (setjmp.h- longjmp() function Example in C)
</ s> </ s> </ s>#include <stdio.h>
#include <setjmp.h>
//defining the type of the variable
static jmp_buf a;
void func(void)
{
//message for user
printf("Function starts here..\n");
//calling function
longjmp(a, 1);
//message for user
printf("Function ends here..\n");
}
int main()
{
int z;
//message for user
printf("Main starts here..\n");
//setting current value in z
z = setjmp(a);
//condition to display message
if (z != 0)
{
//message for user
printf("longjmp function called\n");
return 0;
}
func();
//message for user
printf("Main ends here..\n");
return 0;
}
Output
輸出量
翻譯自: https://www.includehelp.com/c-programs/longjmp-function-of-setjmp-h-in-c.aspx
一個函數里兩個setjmp
