elf/tst-tls-manydynamic: New test

This test adds coverage for creating many dynamic TLS variables
which exhaust the static TLS allocation.

4 files changed, 245 insertions, 2 deletions

diff --git a/elf/Makefile b/elf/Makefile
index 18b3e2a95d..ebdcbc6ff4 100644
--- a/elf/Makefile
+++ b/elf/Makefile
@@ -152,7 +152,7 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
 	 tst-initorder tst-initorder2 tst-relsort1 tst-null-argv \
 	 tst-ptrguard1 tst-tlsalign tst-tlsalign-extern tst-nodelete-opened \
 	 tst-nodelete2 tst-audit11 tst-audit12 tst-dlsym-error tst-noload \
-	 tst-latepthread
+	 tst-latepthread tst-tls-manydynamic
 #	 reldep9
 ifeq ($(build-hardcoded-path-in-tests),yes)
 tests += tst-dlopen-aout
@@ -173,6 +173,10 @@ tlsmod17a-suffixes = 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
 tlsmod18a-suffixes = 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19
 tlsmod17a-modules = $(addprefix tst-tlsmod17a, $(tlsmod17a-suffixes))
 tlsmod18a-modules = $(addprefix tst-tlsmod18a, $(tlsmod17a-suffixes))
+one-hundred = $(foreach x,0 1 2 3 4 5 6 7 8 9, \
+  0$x 1$x 2$x 3$x 4$x 5$x 6$x 7$x 8$x 9$x)
+tst-tls-many-dynamic-modules := \
+  $(foreach n,$(one-hundred),tst-tls-manydynamic$(n)mod)
 extra-test-objs += $(tlsmod17a-modules:=.os) $(tlsmod18a-modules:=.os) \
 		   tst-tlsalign-vars.o
 test-extras += tst-tlsmod17a tst-tlsmod18a tst-tlsalign-vars
@@ -227,7 +231,7 @@ modules-names = testobj1 testobj2 testobj3 testobj4 testobj5 testobj6 \
 		tst-tlsalign-lib tst-nodelete-opened-lib tst-nodelete2mod \
 		tst-audit11mod1 tst-audit11mod2 tst-auditmod11 \
 		tst-audit12mod1 tst-audit12mod2 tst-audit12mod3 tst-auditmod12 \
-		tst-latepthreadmod
+		tst-latepthreadmod $(tst-tls-many-dynamic-modules)
 ifeq (yes,$(have-mtls-dialect-gnu2))
 tests += tst-gnu2-tls1
 modules-names += tst-gnu2-tls1mod
@@ -1278,6 +1282,15 @@ $(objpfx)tst-latepthreadmod.so: $(shared-thread-library)
 $(objpfx)tst-latepthread: $(libdl)
 $(objpfx)tst-latepthread.out: $(objpfx)tst-latepthreadmod.so
 
+# The test modules are parameterized by preprocessor macros.
+$(patsubst %,$(objpfx)%.os,$(tst-tls-many-dynamic-modules)): \
+  $(objpfx)tst-tls-manydynamic%mod.os : tst-tls-manydynamicmod.c
+	$(compile-command.c) \
+	  -DNAME=tls_global_$* -DSETTER=set_value_$* -DGETTER=get_value_$*
+$(objpfx)tst-tls-manydynamic: $(libdl) $(shared-thread-library)
+$(objpfx)tst-tls-manydynamic.out: \
+  $(patsubst %,$(objpfx)%.so,$(tst-tls-many-dynamic-modules))
+
 tst-prelink-ENV = LD_TRACE_PRELINKING=1
 
 $(objpfx)tst-prelink-conflict.out: $(objpfx)tst-prelink.out
diff --git a/elf/tst-tls-manydynamic.c b/elf/tst-tls-manydynamic.c
new file mode 100644
index 0000000000..29bf1394d8
--- /dev/null
+++ b/elf/tst-tls-manydynamic.c
@@ -0,0 +1,150 @@
+/* Test with many dynamic TLS variables.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This test intends to exercise dynamic TLS variable allocation.  It
+   achieves this by combining dlopen (to avoid static TLS allocation
+   after static TLS resizing), many DSOs with a large variable (to
+   exceed the static TLS reserve), and an already-running thread (to
+   force full dynamic TLS initialization).  */
+
+#include "tst-tls-manydynamic.h"
+
+#include <dlfcn.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+static int do_test (void);
+#define TEST_FUNCTION do_test ()
+#include "../test-skeleton.c"
+
+void *handles[COUNT];
+set_value_func set_value_funcs[COUNT];
+get_value_func get_value_funcs[COUNT];
+
+static void
+init_functions (void)
+{
+  for (int i = 0; i < COUNT; ++i)
+    {
+      /* Open the module.  */
+      {
+        char soname[100];
+        snprintf (soname, sizeof (soname), "tst-tls-manydynamic%02dmod.so", i);
+        handles[i] = dlopen (soname, RTLD_LAZY);
+        if (handles[i] == NULL)
+          {
+            printf ("error: dlopen failed: %s\n", dlerror ());
+            exit (1);
+          }
+      }
+
+      /* Obtain the setter function.  */
+      {
+        char fname[100];
+        snprintf (fname, sizeof (fname), "set_value_%02d", i);
+        void *func = dlsym (handles[i], fname);
+        if (func == NULL)
+          {
+            printf ("error: dlsym: %s\n", dlerror ());
+            exit (1);
+          }
+        set_value_funcs[i] = func;
+      }
+
+      /* Obtain the getter function.  */
+      {
+        char fname[100];
+        snprintf (fname, sizeof (fname), "get_value_%02d", i);
+        void *func = dlsym (handles[i], fname);
+        if (func == NULL)
+          {
+            printf ("error: dlsym: %s\n", dlerror ());
+            exit (1);
+          }
+        get_value_funcs[i] = func;
+      }
+    }
+}
+
+static pthread_barrier_t barrier;
+
+/* Running thread which forces real TLS initialization.  */
+static void *
+blocked_thread_func (void *closure)
+{
+  xpthread_barrier_wait (&barrier);
+
+  /* TLS test runs here in the main thread.  */
+
+  xpthread_barrier_wait (&barrier);
+  return NULL;
+}
+
+static int
+do_test (void)
+{
+  {
+    int ret = pthread_barrier_init (&barrier, NULL, 2);
+    if (ret != 0)
+      {
+        errno = ret;
+        printf ("error: pthread_barrier_init: %m\n");
+        exit (1);
+      }
+  }
+
+  pthread_t blocked_thread = xpthread_create (NULL, blocked_thread_func, NULL);
+  xpthread_barrier_wait (&barrier);
+
+  init_functions ();
+
+  struct value values[COUNT];
+  /* Initialze the TLS variables.  */
+  for (int i = 0; i < COUNT; ++i)
+    {
+      for (int j = 0; j < PER_VALUE_COUNT; ++j)
+        values[i].num[j] = rand ();
+      set_value_funcs[i] (&values[i]);
+    }
+
+  /* Read back their values to check that they do not overlap.  */
+  for (int i = 0; i < COUNT; ++i)
+    {
+      struct value actual;
+      get_value_funcs[i] (&actual);
+
+      for (int j = 0; j < PER_VALUE_COUNT; ++j)
+        if (actual.num[j] != values[i].num[j])
+        {
+          printf ("error: mismatch at variable %d/%d: %d != %d\n",
+                  i, j, actual.num[j], values[i].num[j]);
+          exit (1);
+        }
+    }
+
+  xpthread_barrier_wait (&barrier);
+  xpthread_join (blocked_thread);
+
+  /* Close the modules.  */
+  for (int i = 0; i < COUNT; ++i)
+    dlclose (handles[i]);
+
+  return 0;
+}
diff --git a/elf/tst-tls-manydynamic.h b/elf/tst-tls-manydynamic.h
new file mode 100644
index 0000000000..4756ece5dd
--- /dev/null
+++ b/elf/tst-tls-manydynamic.h
@@ -0,0 +1,44 @@
+/* Interfaces for test with many dynamic TLS variables.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+#ifndef TST_TLS_MANYDYNAMIC_H
+#define TST_TLS_MANYDYNAMIC_H
+
+enum
+  {
+    /* This many TLS variables (and modules) are defined.  */
+    COUNT = 100,
+
+    /* Number of elements in the TLS variable.  */
+    PER_VALUE_COUNT = 1,
+  };
+
+/* The TLS variables are of this type.  We use a larger type to ensure
+   that we can reach the static TLS limit with COUNT variables.  */
+struct value
+{
+  int num[PER_VALUE_COUNT];
+};
+
+/* Set the TLS variable defined in the module.  */
+typedef void (*set_value_func) (const struct value *);
+
+/* Read the TLS variable defined in the module.  */
+typedef void (*get_value_func) (struct value *);
+
+#endif /* TST_TLS_MANYDYNAMICMOD_H */
diff --git a/elf/tst-tls-manydynamicmod.c b/elf/tst-tls-manydynamicmod.c
new file mode 100644
index 0000000000..578f11b857
--- /dev/null
+++ b/elf/tst-tls-manydynamicmod.c
@@ -0,0 +1,36 @@
+/* Module for test with many dynamic TLS variables.
+   Copyright (C) 2016 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 of the License, or (at your option) any later version.
+
+   The GNU C Library is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library; if not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This file is parameterized by macros NAME, SETTER, GETTER, which
+   are set form the Makefile.  */
+
+#include "tst-tls-manydynamic.h"
+
+__thread struct value NAME;
+
+void
+SETTER (const struct value *value)
+{
+  NAME = *value;
+}
+
+void
+GETTER (struct value *value)
+{
+  *value = NAME;
+}