How do I pass arguments to functions with makecontext?
I would like to pass arguments to functions that get context switched into but I'm having problems...
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
|
#include <ucontext.h>
#include <iostream>
#include <cstdlib>
static ucontext_t main_context;
static ucontext_t func1_context;
static ucontext_t func2_context;
static ucontext_t func3_context;
#define EXIT_SUCCESS 0
using std::cout;using std::endl;
static void func1(int k)
{
cout<<"func1: started.\n";
cout<<"argument is: "<<k<<endl;
cout<<"context switching into function 3.\n";
if (swapcontext(&func1_context, &func3_context) == -1){
cout<<"an error occured.\n";
} cout<<"exiting from func1.\n";
}
static void func2(int i)
{
cout<<"func2: started.\n";
cout<<"argument is: "<<i<<endl;
cout<<"context switching into function 1\n";
if (swapcontext(&func2_context, &func1_context) == -1){
cout<<"an error occured.\n";
} cout<<"exiting from func2.\n";
}
static void func3(int p){
cout<<"func3: started.\n";
/*
cout<<"context switchign into main,\n";
if(swapcontext(&func3_context, &main_context) == -1){
cout<<"an error occured.\n";
}*/
cout<<"argument is: "<<p<<endl;
cout<<"func3 returning.\n";
}
int main(int argc, char *argv[])
{
char func1_stack[16384];
char func2_stack[16384];
char func3_stack[16384];
if (getcontext(&func1_context) == -1){
cout<<"an error occured.\n";
}
//stack used by func1_context
func1_context.uc_stack.ss_sp = func1_stack;
func1_context.uc_stack.ss_size = sizeof(func1_stack);
func1_context.uc_link = &func3_context;
makecontext(&func1_context, func1, 1);
if (getcontext(&func2_context) == -1){
cout<<"an error occured.\n";
}
//stack used by func2_context
func2_context.uc_stack.ss_sp = func2_stack;
func2_context.uc_stack.ss_size = sizeof(func2_stack);
func2_context.uc_link = &func1_context;
makecontext(&func2_context, func2, 1);
if(getcontext(&func3_context) == -1){
cout<<"an error occured.\n";
}
//stack used by func3_context
func3_context.uc_stack.ss_sp = func3_stack;
func3_context.uc_stack.ss_size = sizeof(func3_stack);
func3_context.uc_link = NULL;
makecontext(&func3_context, func3, 1);
cout<<"context switching into function 2.\n";
if (swapcontext(&main_context, &func2_context) == -1){
cout<<"an error occured.\n";
}
cout<<"just came back from function 3.\n";
cout<<"main: exiting.\n";
return 0;
}
|
ERRORS
in function int main(int,char**)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
|
In function 'int main(int, char**)':
50:41: error: invalid conversion from 'void (*)(int)' to 'void (*)()' [-fpermissive]
In file included from 1:0:
/usr/include/ucontext.h:47:13: note: initializing argument 2 of 'void makecontext(ucontext_t*, void (*)(), int, ...)'
extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
^
58:41: error: invalid conversion from 'void (*)(int)' to 'void (*)()' [-fpermissive]
In file included from 1:0:
/usr/include/ucontext.h:47:13: note: initializing argument 2 of 'void makecontext(ucontext_t*, void (*)(), int, ...)'
extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
^
66:38: error: invalid conversion from 'void (*)(int)' to 'void (*)()' [-fpermissive]
In file included from 1:0:
/usr/include/ucontext.h:47:13: note: initializing argument 2 of 'void makecontext(ucontext_t*, void (*)(), int, ...)'
extern void makecontext (ucontext_t *__ucp, void (*__func) (void),
|
thanks in advance
Last edited on
Which line of the program is the error?
Line 50, 58 and 66.38
Topic archived. No new replies allowed.