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

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

diff --git a/libgo/runtime/proc.c b/libgo/runtime/proc.c
index 87cd3edac00aebce9602b0f1d6d011607db9bf65..8907c3aa520d7b2e62579ec6e458b2015ea09593 100644 (file)
--- a/libgo/runtime/proc.c
+++ b/libgo/runtime/proc.c
@@ -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;