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runtime: Don't create threads with a small stack.

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We want to create goroutines with a small stack, at least on
systems where split stacks are supported.  We don't need to
create threads with a small stack.

From-SVN: r216353
This commit is contained in:
Ian Lance Taylor 2014-10-16 22:39:45 +00:00
parent e4c6530e82
commit 6c4ee063a5
1 changed files with 0 additions and 55 deletions
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55
libgo/runtime/proc.c
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@ -167,15 +167,11 @@ runtime_setmg(M* mp, G* gp)
g = gp;
}
// The static TLS size. See runtime_newm.
static int tlssize;
// Start a new thread.
static void
runtime_newosproc(M *mp)
{
pthread_attr_t attr;
size_t stacksize;
sigset_t clear, old;
pthread_t tid;
int ret;
@ -185,19 +181,6 @@ runtime_newosproc(M *mp)
if(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0)
runtime_throw("pthread_attr_setdetachstate");
stacksize = PTHREAD_STACK_MIN;
// With glibc before version 2.16 the static TLS size is taken
// out of the stack size, and we get an error or a crash if
// there is not enough stack space left. Add it back in if we
// can, in case the program uses a lot of TLS space. FIXME:
// This can be disabled in glibc 2.16 and later, if the bug is
// indeed fixed then.
stacksize += tlssize;
if(pthread_attr_setstacksize(&attr, stacksize) != 0)
runtime_throw("pthread_attr_setstacksize");
// Block signals during pthread_create so that the new thread
// starts with signals disabled. It will enable them in minit.
sigfillset(&clear);
@ -306,43 +289,6 @@ runtime_mcall(void (*pfn)(G*))
}
}
#ifdef HAVE_DL_ITERATE_PHDR
// Called via dl_iterate_phdr.
static int
addtls(struct dl_phdr_info* info, size_t size __attribute__ ((unused)), void *data)
{
size_t *total = (size_t *)data;
unsigned int i;
for(i = 0; i < info->dlpi_phnum; ++i) {
if(info->dlpi_phdr[i].p_type == PT_TLS)
*total += info->dlpi_phdr[i].p_memsz;
}
return 0;
}
// Set the total TLS size.
static void
inittlssize()
{
size_t total = 0;
dl_iterate_phdr(addtls, (void *)&total);
tlssize = total;
}
#else
static void
inittlssize()
{
}
#endif
// Goroutine scheduler
// The scheduler's job is to distribute ready-to-run goroutines over worker threads.
//
@ -481,7 +427,6 @@ runtime_schedinit(void)
g->m = m;
initcontext();
inittlssize();
runtime_sched.maxmcount = 10000;
runtime_precisestack = 0;