On Thu, Mar 22, 2001 at 08:58:58AM +0530, Kalyanaraman, Sivakumar (CTS) wrote:
> Hi all,
> Is it possible to dynamically spawn threads from RTLinux/RTAI ? The
> documentation for pthread_create in RTlinux states that the function can be
> called only in kernel mode. Is there any other way ?
It's very simple to do this. If there is a request, I will post a working
example.
The basic idea is
typedef *(*start_routine)(void *) assign_func_t; // function to run.
assign_func_t myfunc[MAX_DYNAMIC_THREADS];
pthread_t t[MAX_DYNAMIC_THREADS];
#define EXITVALUE (assign_func_t)-1
#define IDLEVALUE (assign_func_t)1 // this is never a usable pointer value
#define BUSY (assign_func_t)0 // start busy
module_init:
for(i=0; i < MAX_DYNAMIC_THREADS; i++)
pthread_create(&t[i],waitaround,i,0);
and then
void waitaround(void *i){
int x; //for saving irq state.
int j = (int)i;
while(myfunc[j] != EXITVALUE){
if(myfunc[j] == BUSY){ // we are BUSY going to sleep
rtl_disable_interrupts(x);
myfunc[j] = IDLEVALUE;
pthread_suspend_np(pthread_self());
rtl_restore_interrupts(x);
}
else {
myfunc[j]();
}
myfunc[j] = BUSY;
}
int dynamic_create(assign_funct_t f){
for(i=0 ; i < MAX_DYNAMIC_THREADS; i++)
if(myfunc[i] == IDLEVALUE){
myfunc[j] = f;
pthread_wakeup_np(t[j]);
return j;
}
return -1;
}
This is not smp safe, but it should work.
>
> regards,
> siva
>
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> fact."
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