static void
sig_handler (int sig)
{
  int i;

#ifdef SIGPROF
  if (sig == SIGPROF)
    {
      /* FIXME.  */
      runtime_sigprof (0, 0, nil, nil);
      return;
    }
#endif

  for (i = 0; runtime_sigtab[i].sig != -1; ++i)
    {
      struct sigaction sa;
      SigTab *t;

      t = &runtime_sigtab[i];

      if (t->sig != sig)
	continue;

      if ((t->flags & SigNotify) != 0)
	{
	  if (__go_sigsend (sig))
	    return;
	}
      if ((t->flags & SigKill) != 0)
	runtime_exit (2);
      if ((t->flags & SigThrow) == 0)
	return;

      runtime_startpanic ();

      /* We should do a stack backtrace here.  Until we can do that,
	 we reraise the signal in order to get a slightly better
	 report from the shell.  */

      memset (&sa, 0, sizeof sa);

      sa.sa_handler = SIG_DFL;

      i = sigemptyset (&sa.sa_mask);
      __go_assert (i == 0);

      if (sigaction (sig, &sa, NULL) != 0)
	abort ();

      raise (sig);

      runtime_exit (2);
    }

  __builtin_unreachable ();
}
Exemple #2
0
// The main goroutine.
void
runtime_main(void)
{
	// Lock the main goroutine onto this, the main OS thread,
	// during initialization.  Most programs won't care, but a few
	// do require certain calls to be made by the main thread.
	// Those can arrange for main.main to run in the main thread
	// by calling runtime.LockOSThread during initialization
	// to preserve the lock.
	runtime_LockOSThread();
	// From now on, newgoroutines may use non-main threads.
	setmcpumax(runtime_gomaxprocs);
	runtime_sched.init = true;
	scvg = __go_go(runtime_MHeap_Scavenger, nil);
	main_init();
	runtime_sched.init = false;
	if(!runtime_sched.lockmain)
		runtime_UnlockOSThread();

	// For gccgo we have to wait until after main is initialized
	// to enable GC, because initializing main registers the GC
	// roots.
	mstats.enablegc = 1;

	// The deadlock detection has false negatives.
	// Let scvg start up, to eliminate the false negative
	// for the trivial program func main() { select{} }.
	runtime_gosched();

	main_main();
	runtime_exit(0);
	for(;;)
		*(int32*)0 = 0;
}
Exemple #3
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// The main goroutine.
void
runtime_main(void)
{
	// Lock the main goroutine onto this, the main OS thread,
	// during initialization.  Most programs won't care, but a few
	// do require certain calls to be made by the main thread.
	// Those can arrange for main.main to run in the main thread
	// by calling runtime.LockOSThread during initialization
	// to preserve the lock.
	runtime_LockOSThread();
	runtime_sched.init = true;
	main_init();
	runtime_sched.init = false;
	if(!runtime_sched.lockmain)
		runtime_UnlockOSThread();

	// For gccgo we have to wait until after main is initialized
	// to enable GC, because initializing main registers the GC
	// roots.
	mstats.enablegc = 1;

	main_main();
	runtime_exit(0);
	for(;;)
		*(int32*)0 = 0;
}
Exemple #4
0
static void
runtime_badsignal(int32 sig)
{
	if (sig == SIGPROF) {
		return;  // Ignore SIGPROFs intended for a non-Go thread.
	}
	runtime_write(2, badsignal, sizeof badsignal - 1);
	runtime_exit(1);
}
Exemple #5
0
void pabort(const char *format, ...)
{
  va_list args;

  va_start(args, format);
  printf("ABORT: ");
  vfprintf(stderr, format, args);
  va_end(args);
  runtime_exit();
}
Exemple #6
0
void
runtime_startpanic(void)
{
	M *m;

	m = runtime_m();
	if(runtime_mheap.cachealloc.size == 0) { // very early
		runtime_printf("runtime: panic before malloc heap initialized\n");
		m->mallocing = 1; // tell rest of panic not to try to malloc
	} else if(m->mcache == nil) // can happen if called from signal handler or throw
		m->mcache = runtime_allocmcache();
	switch(m->dying) {
	case 0:
		m->dying = 1;
		if(runtime_g() != nil)
			runtime_g()->writebuf = nil;
		runtime_xadd(&runtime_panicking, 1);
		runtime_lock(&paniclk);
		if(runtime_debug.schedtrace > 0 || runtime_debug.scheddetail > 0)
			runtime_schedtrace(true);
		runtime_freezetheworld();
		return;
	case 1:
		// Something failed while panicing, probably the print of the
		// argument to panic().  Just print a stack trace and exit.
		m->dying = 2;
		runtime_printf("panic during panic\n");
		runtime_dopanic(0);
		runtime_exit(3);
	case 2:
		// This is a genuine bug in the runtime, we couldn't even
		// print the stack trace successfully.
		m->dying = 3;
		runtime_printf("stack trace unavailable\n");
		runtime_exit(4);
	default:
		// Can't even print!  Just exit.
		runtime_exit(5);
	}
}
Exemple #7
0
void
runtime_throw(const char *s)
{
	M *mp;

	mp = runtime_m();
	if(mp->throwing == 0)
		mp->throwing = 1;
	runtime_startpanic();
	runtime_printf("fatal error: %s\n", s);
	runtime_dopanic(0);
	*(int32*)0 = 0;	// not reached
	runtime_exit(1);	// even more not reached
}
Exemple #8
0
void
runtime_dopanic(int32 unused __attribute__ ((unused)))
{
	G *g;
	static bool didothers;
	bool crash;
	int32 t;

	g = runtime_g();
	if(g->sig != 0)
		runtime_printf("[signal %x code=%p addr=%p]\n",
			       g->sig, (void*)g->sigcode0, (void*)g->sigcode1);

	if((t = runtime_gotraceback(&crash)) > 0){
		if(g != runtime_m()->g0) {
			runtime_printf("\n");
			runtime_goroutineheader(g);
			runtime_traceback();
			runtime_printcreatedby(g);
		} else if(t >= 2 || runtime_m()->throwing > 0) {
			runtime_printf("\nruntime stack:\n");
			runtime_traceback();
		}
		if(!didothers) {
			didothers = true;
			runtime_tracebackothers(g);
		}
	}
	runtime_unlock(&paniclk);
	if(runtime_xadd(&runtime_panicking, -1) != 0) {
		// Some other m is panicking too.
		// Let it print what it needs to print.
		// Wait forever without chewing up cpu.
		// It will exit when it's done.
		static Lock deadlock;
		runtime_lock(&deadlock);
		runtime_lock(&deadlock);
	}
	
	if(crash)
		runtime_crash();

	runtime_exit(2);
}
Exemple #9
0
// One round of scheduler: find a goroutine and run it.
// The argument is the goroutine that was running before
// schedule was called, or nil if this is the first call.
// Never returns.
static void
schedule(G *gp)
{
	int32 hz;
	uint32 v;

	schedlock();
	if(gp != nil) {
		// Just finished running gp.
		gp->m = nil;
		runtime_sched.grunning--;

		// atomic { mcpu-- }
		v = runtime_xadd(&runtime_sched.atomic, -1<<mcpuShift);
		if(atomic_mcpu(v) > maxgomaxprocs)
			runtime_throw("negative mcpu in scheduler");

		switch(gp->status){
		case Grunnable:
		case Gdead:
			// Shouldn't have been running!
			runtime_throw("bad gp->status in sched");
		case Grunning:
			gp->status = Grunnable;
			gput(gp);
			break;
		case Gmoribund:
			gp->status = Gdead;
			if(gp->lockedm) {
				gp->lockedm = nil;
				m->lockedg = nil;
			}
			gp->idlem = nil;
			runtime_memclr(&gp->context, sizeof gp->context);
			gfput(gp);
			if(--runtime_sched.gcount == 0)
				runtime_exit(0);
			break;
		}
		if(gp->readyonstop){
			gp->readyonstop = 0;
			readylocked(gp);
		}
	} else if(m->helpgc) {
		// Bootstrap m or new m started by starttheworld.
		// atomic { mcpu-- }
		v = runtime_xadd(&runtime_sched.atomic, -1<<mcpuShift);
		if(atomic_mcpu(v) > maxgomaxprocs)
			runtime_throw("negative mcpu in scheduler");
		// Compensate for increment in starttheworld().
		runtime_sched.grunning--;
		m->helpgc = 0;
	} else if(m->nextg != nil) {
		// New m started by matchmg.
	} else {
		runtime_throw("invalid m state in scheduler");
	}

	// Find (or wait for) g to run.  Unlocks runtime_sched.
	gp = nextgandunlock();
	gp->readyonstop = 0;
	gp->status = Grunning;
	m->curg = gp;
	gp->m = m;

	// Check whether the profiler needs to be turned on or off.
	hz = runtime_sched.profilehz;
	if(m->profilehz != hz)
		runtime_resetcpuprofiler(hz);

	runtime_gogo(gp);
}
Exemple #10
0
static void
sig_handler (int sig)
{
  int i;

  if (runtime_m () == NULL)
    {
      runtime_badsignal (sig);
      return;
    }

#ifdef SIGPROF
  if (sig == SIGPROF)
    {
      runtime_sigprof ();
      return;
    }
#endif

  for (i = 0; runtime_sigtab[i].sig != -1; ++i)
    {
      SigTab *t;

      t = &runtime_sigtab[i];

      if (t->sig != sig)
	continue;

      if ((t->flags & SigNotify) != 0)
	{
	  if (__go_sigsend (sig))
	    return;
	}
      if ((t->flags & SigKill) != 0)
	runtime_exit (2);
      if ((t->flags & SigThrow) == 0)
	return;

      runtime_startpanic ();

      {
	const char *name = NULL;

#ifdef HAVE_STRSIGNAL
	name = strsignal (sig);
#endif

	if (name == NULL)
	  runtime_printf ("Signal %d\n", sig);
	else
	  runtime_printf ("%s\n", name);
      }

      runtime_printf ("\n");

      if (runtime_gotraceback ())
	{
	  G *g;

	  g = runtime_g ();
	  runtime_traceback (g);
	  runtime_tracebackothers (g);

	  /* The gc library calls runtime_dumpregs here, and provides
	     a function that prints the registers saved in context in
	     a readable form.  */
	}

      runtime_exit (2);
    }

  __builtin_unreachable ();
}
Exemple #11
0
void exit(int status)
{
  printf("Exit called with %d\n", status);
  runtime_exit();
}