nanogui: multithread question
Subject:
multithread question
From:
"hongouyang" ####@####.####
Date:
17 May 2001 00:57:09 -0000
Message-Id: <002a01c0de6c$47bbd420$557e9684@sttri.com>
Hello, every one.
I am using flnx0.16 and I attemp to make multithread work on it. I want to make a thread show the time on the gui every one second and I used the threadcreate(...) api. But when I compile and link the programe with gcc, a error occured and said can not resolve the reference to threadcreate( ). Am I write wrong or the needed libary does not exixt? And this is the demo code.
#include <stdio.h>
#include <string.h>
#include <pthread.h>
#include <errno.h>
class A{
public:
int a;
pthread_t w_tid;
pthread_t r_tid;
void doit();
void* writer(void* arg);
void* reader(void* arg);
A(){
this->a = 0;
}
};
void* A::writer(void* arg){
while(1)
printf("thread writer: %d \n", this->a++);
return NULL;
}
void* A::reader(void* arg){
while(1)
printf("thread reader: %d \n", this->a--);
return NULL;
}
void A::doit(){
pthread_create(&w_tid, NULL, &A::writer, NULL);
pthread_create(&r_tid, NULL, &A::reader, NULL);
pthread_join(w_tid, NULL);
pthread_join(r_tid, NULL);
}
int main(int argc, char** argv){
A* aa = new A();
aa->doit();
return 0;
}
Another question. When I add a callback to the flnx button, the callback function must ba a static function in a class or a global function, or the program will cause segmentation fault when running.How does this happen?
Thanks in advance.
