exported db_env_do_backtrace to get toku stack and engine status Tokutek/mongo#987

buildheader/make_tdb.cc

@@ -854,6 +854,7 @@ int main (int argc, char *const argv[] __attribute__((__unused__))) {
     printf("void db_env_set_num_bucket_mutexes(uint32_t) %s;\n", VISIBLE);
     printf("int db_env_set_toku_product_name(const char*) %s;\n", VISIBLE);
     printf("void db_env_try_gdb_stack_trace(const char *gdb_path) %s;\n", VISIBLE);
+    printf("void db_env_do_backtrace(void) %s;\n", VISIBLE);
 
     printf("#if defined(__cplusplus) || defined(__cilkplusplus)\n}\n#endif\n");
     printf("#endif\n");

portability/toku_assert.cc

@@ -93,6 +93,8 @@ PATENT RIGHTS GRANT:
 #include <toku_portability.h>
 #include "toku_assert.h"
 
+#include <db.h>
+
 #include <stdlib.h>
 #include <stdio.h>
 #if defined(HAVE_MALLOC_H)
@@ -138,11 +140,7 @@ void toku_assert_set_fpointers(int (*toku_maybe_get_engine_status_text_pointer)(
 bool toku_gdb_dump_on_assert = false;
 void (*do_assert_hook)(void) = NULL;
 
-static void toku_do_backtrace_abort(void) __attribute__((noreturn));
-
-static void 
-toku_do_backtrace_abort(void) {
-
+void db_env_do_backtrace(void) {
     // backtrace
 #if !TOKU_WINDOWS
     int n = backtrace(backtrace_pointers, N_POINTERS);
@@ -171,6 +169,11 @@ toku_do_backtrace_abort(void) {
     if (toku_gdb_dump_on_assert) {
         toku_try_gdb_stack_trace(nullptr);
     }
+}
+
+__attribute__((noreturn))
+static void toku_do_backtrace_abort(void) {
+    db_env_do_backtrace();
 
 #if TOKU_WINDOWS
     //Following commented methods will not always end the process (could hang).