TError TContext::CreateDaemonCgs() {
DaemonCgs[memorySubsystem] = memorySubsystem->GetRootCgroup()->GetChild(PORTO_DAEMON_CGROUP);
DaemonCgs[cpuacctSubsystem] = cpuacctSubsystem->GetRootCgroup()->GetChild(PORTO_DAEMON_CGROUP);
for (auto cg : DaemonCgs) {
TError error = cg.second->Create();
if (error)
return error;
// portod-slave
error = cg.second->Attach(GetPid());
if (error)
return error;
// portod master
error = cg.second->Attach(GetPPid());
if (error)
return error;
}
if (!config().daemon().debug()) {
TError error = memorySubsystem->SetLimit(DaemonCgs[memorySubsystem], config().daemon().memory_limit());
if (error)
return error;
}
return TError::Success();
}
/*
PROGRAM: fibo_task
This program will repeatedly receive synchronously a positive value k and compute
the k-th fibonacci number. Each computed fibonacci number is sent to the "printer"
message queue. It exits if it receives k==-1
*/
int fibo_task(int argl, void* args)
{
unsigned int k,f;
long msg;
char *prbuf = malloc(1024);
Pid_t pid;
sprintf(prbuf,"Hello from fibo_task process %d.\n",GetPid());
print_string(prbuf);
while(1) {
// Wait for a request to compute a Fibonacci number.
pid = ReceivePort(&msg, 1);
assert(pid == GetPPid());
if(msg<0) {
sprintf(prbuf, "fibo_task exiting (pid = %d). Bye!\n", GetPid());
print_string(prbuf);
free(prbuf);
Exit(0); /* Test Exit! */
}
k = msg;
sprintf(prbuf,"I will compute the %d-th Fibonacci number\n",k);
print_string(prbuf);
f = fibo(k);
sprintf(prbuf,"The %d-th Fibonacci number is %d.\n",k,f);
print_string(prbuf);
}
return 0;
}
/*
PPROGRAM: printer_task
This task creates a mailbox and receives strings, which then prints to the terminal.
Conceptually, this is a "service", started by boot_task and ending when boot_task
asks it to quit.
*/
int printer_task(int argl, void* args)
{
int ok;
Message m;
ok = CreateMailBox("printer");
assert(ok==0);
// synchronize with my parent, he waited for me to create my mailbox
SendPort(GetPPid(), 0L);
// print loop
while(1) {
GetMail("printer", &m);
if(m.type == PRINTER_PRINT)
printf("Process %d: %s",m.sender,(char*)(m.data));
else if(m.type == PRINTER_QUIT) {
/* only if parent says so! */
if(m.sender==GetPPid()) break;
}
/* else ignore */
}
return 0;
}
TError InitializeDaemonCgroups() {
std::vector<TSubsystem *> DaemonSubsystems = {
{ &MemorySubsystem },
{ &CpuacctSubsystem },
};
for (auto subsys : DaemonSubsystems) {
auto hy = subsys->Hierarchy;
TError error;
if (!hy)
continue;
TCgroup cg = hy->Cgroup(PORTO_DAEMON_CGROUP);
if (!cg.Exists()) {
error = cg.Create();
if (error)
return error;
}
// portod-slave
error = cg.Attach(GetPid());
if (error)
return error;
// portod master
error = cg.Attach(GetPPid());
if (error)
return error;
}
TCgroup cg = MemorySubsystem.Cgroup(PORTO_DAEMON_CGROUP);
TError error = MemorySubsystem.SetLimit(cg, config().daemon().memory_limit());
if (error)
return error;
return TError::Success();
}
