static void
gtraceback(G* gp)
{
Traceback* traceback;
traceback = gp->traceback;
gp->traceback = nil;
traceback->c = runtime_callers(1, traceback->pcbuf,
sizeof traceback->pcbuf / sizeof traceback->pcbuf[0]);
runtime_gogo(traceback->gp);
}
static void
gtraceback(G* gp)
{
G* ret;
runtime_traceback(nil);
runtime_goroutinetrailer(gp);
ret = gp->dotraceback;
gp->dotraceback = nil;
runtime_gogo(ret);
}
void
runtime_tracebackothers(G * volatile me)
{
G * volatile g;
Traceback traceback;
traceback.gp = me;
for(g = runtime_allg; g != nil; g = g->alllink) {
if(g == me || g->status == Gdead)
continue;
runtime_printf("\n");
runtime_goroutineheader(g);
// Our only mechanism for doing a stack trace is
// _Unwind_Backtrace. And that only works for the
// current thread, not for other random goroutines.
// So we need to switch context to the goroutine, get
// the backtrace, and then switch back.
// This means that if g is running or in a syscall, we
// can't reliably print a stack trace. FIXME.
if(g->status == Gsyscall || g->status == Grunning) {
runtime_printf("no stack trace available\n");
runtime_goroutinetrailer(g);
continue;
}
g->traceback = &traceback;
#ifdef USING_SPLIT_STACK
__splitstack_getcontext(&me->stack_context[0]);
#endif
getcontext(&me->context);
if(g->traceback != nil) {
runtime_gogo(g);
}
runtime_printtrace(traceback.pcbuf, traceback.c);
runtime_goroutinetrailer(g);
}
}
// 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);
}