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/*
* Thread library.
*/
#include "threadimpl.h"
typedef struct Mainarg Mainarg;
struct Mainarg
{
int argc;
char **argv;
};
int _threadmainpid;
int mainstacksize;
int _callsthreaddaemonize;
static int passtomainpid;
extern void (*_sysfatal)(char*, va_list);
static void
mainlauncher(void *arg)
{
Mainarg *a;
a = arg;
_threadmaininit();
threadmain(a->argc, a->argv);
threadexits("threadmain");
}
static void
passer(void *x, char *msg)
{
USED(x);
Waitmsg *w;
if(strcmp(msg, "sys: usr2") == 0)
_exit(0); /* daemonize */
else if(strcmp(msg, "sys: child") == 0){
w = wait();
if(w == nil)
_exit(1);
_exit(atoi(w->msg));
}else
postnote(PNPROC, passtomainpid, msg);
}
int
main(int argc, char **argv)
{
int pid;
Mainarg a;
Proc *p;
sigset_t mask;
/*
* Do daemonize hack here.
*/
if(_callsthreaddaemonize){
passtomainpid = getpid();
switch(pid = fork()){
case -1:
sysfatal("fork: %r");
case 0:
/* continue executing */
_threadmainpid = getppid();
break;
default:
/* wait for signal USR2 */
notify(passer);
for(;;)
pause();
_exit(0);
}
}
/*
* Instruct QLock et al. to use our scheduling functions
* so that they can operate at the thread level.
*/
_qlockinit(_threadsleep, _threadwakeup);
/*
* Install our own _threadsysfatal which takes down
* the whole conglomeration of procs.
*/
_sysfatal = _threadsysfatal;
/*
* XXX Install our own jump handler.
*/
/*
* Install our own signal handlers.
*/
notify(_threadnote);
/*
* Construct the initial proc running mainlauncher(&a).
*/
if(mainstacksize == 0)
mainstacksize = 32*1024;
a.argc = argc;
a.argv = argv;
p = _newproc();
_newthread(p, mainlauncher, &a, mainstacksize, "threadmain", 0);
_threadscheduler(p);
abort(); /* not reached */
return 0;
}
/*
* No-op function here so that sched.o drags in main.o.
*/
void
_threadlinkmain(void)
{
}
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