Test various forms of threads tracking across exec(2).

Index: gdb-7.10.90.20160211/gdb/testsuite/gdb.threads/threaded-exec.c

===================================================================

--- gdb-7.10.90.20160211.orig/gdb/testsuite/gdb.threads/threaded-exec.c	2016-02-16 09:54:45.157163049 +0100

+++ gdb-7.10.90.20160211/gdb/testsuite/gdb.threads/threaded-exec.c	2016-02-16 09:54:46.210170175 +0100

@@ -18,21 +18,95 @@

    Boston, MA 02111-1307, USA.  */

 #include <stddef.h>

-#include <pthread.h>

 #include <assert.h>

 #include <stdlib.h>

 #include <unistd.h>

+#include <stdio.h>

+#ifdef THREADS

+

+# include <pthread.h>

 static void *

 threader (void *arg)

 {

-	return NULL;

+  return NULL;

 }

+#endif

+

 int

-main (void)

+main (int argc, char **argv)

 {

+  char *exec_nothreads, *exec_threads, *cmd;

+  int phase;

+  char phase_s[8];

+

+  setbuf (stdout, NULL);

+

+  if (argc != 4)

+    {

+      fprintf (stderr, "%s <non-threaded> <threaded> <phase>\n", argv[0]);

+      return 1;

+    }

+

+#ifdef THREADS

+  puts ("THREADS: Y");

+#else

+  puts ("THREADS: N");

+#endif

+  exec_nothreads = argv[1];

+  printf ("exec_nothreads: %s\n", exec_nothreads);

+  exec_threads = argv[2];

+  printf ("exec_threads: %s\n", exec_threads);

+  phase = atoi (argv[3]);

+  printf ("phase: %d\n", phase);

+

+  /* Phases: threading

+     0: N -> N

+     1: N -> Y

+     2: Y -> Y

+     3: Y -> N

+     4: N -> exit  */

+

+  cmd = NULL;

+

+#ifndef THREADS

+  switch (phase)

+    {

+    case 0:

+      cmd = exec_nothreads;

+      break;

+    case 1:

+      cmd = exec_threads;

+      break;

+    case 2:

+      fprintf (stderr, "%s: We should have threads for phase %d!\n", argv[0],

+	       phase);

+      return 1;

+    case 3:

+      fprintf (stderr, "%s: We should have threads for phase %d!\n", argv[0],

+	       phase);

+      return 1;

+    case 4:

+      return 0;

+    default:

+      assert (0);

+    }

+#else	/* THREADS */

+  switch (phase)

+    {

+    case 0:

+      fprintf (stderr, "%s: We should not have threads for phase %d!\n",

+	       argv[0], phase);

+      return 1;

+    case 1:

+      fprintf (stderr, "%s: We should not have threads for phase %d!\n",

+	       argv[0], phase);

+      return 1;

+    case 2:

+      cmd = exec_threads;

+      {

 	pthread_t t1;

 	int i;

@@ -40,7 +114,34 @@

 	assert (i == 0);

 	i = pthread_join (t1, NULL);

 	assert (i == 0);

+      }

+      break;

+    case 3:

+      cmd = exec_nothreads;

+      {

+	pthread_t t1;

+	int i;

+

+	i = pthread_create (&t1, NULL, threader, (void *) NULL);

+	assert (i == 0);

+	i = pthread_join (t1, NULL);

+	assert (i == 0);

+      }

+      break;

+    case 4:

+      fprintf (stderr, "%s: We should not have threads for phase %d!\n",

+	       argv[0], phase);

+      return 1;

+    default:

+      assert (0);

+    }

+#endif	/* THREADS */

+

+  assert (cmd != NULL);

+

+  phase++;

+  snprintf (phase_s, sizeof phase_s, "%d", phase);

-	execl ("/bin/true", "/bin/true", NULL);

-	abort ();

+  execl (cmd, cmd, exec_nothreads, exec_threads, phase_s, NULL);

+  assert (0);

 }

Index: gdb-7.10.90.20160211/gdb/testsuite/gdb.threads/threaded-exec.exp

===================================================================

--- gdb-7.10.90.20160211.orig/gdb/testsuite/gdb.threads/threaded-exec.exp	2016-02-16 09:54:45.157163049 +0100

+++ gdb-7.10.90.20160211/gdb/testsuite/gdb.threads/threaded-exec.exp	2016-02-16 09:55:27.397448879 +0100

@@ -20,9 +20,14 @@

 set testfile threaded-exec

 set srcfile ${testfile}.c

-set binfile [standard_output_file ${testfile}]

+set binfile_nothreads [standard_output_file ${testfile}N]

+set binfile_threads [standard_output_file ${testfile}Y]

-if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile}" executable []] != "" } {

+if {[gdb_compile "${srcdir}/${subdir}/${srcfile}" "${binfile_nothreads}" executable {additional_flags=-UTHREADS}] != "" } {

+    return -1

+}

+

+if {[gdb_compile_pthreads "${srcdir}/${subdir}/${srcfile}" "${binfile_threads}" executable {additional_flags=-DTHREADS}] != "" } {

     return -1

 }

@@ -30,9 +35,9 @@

 gdb_start

 gdb_reinitialize_dir $srcdir/$subdir

-gdb_load ${binfile}

+gdb_load ${binfile_nothreads}

-gdb_run_cmd

+gdb_run_cmd ${binfile_nothreads} ${binfile_threads} 0

 gdb_test_multiple {} "Program exited" {

    -re "\r\n\\\[Inferior .* exited normally\\\]\r\n$gdb_prompt $" {