Added mechanism for using checkpoint callback, for testing only.

git-svn-id: file:///svn/toku/tokudb@11314 c7de825b-a66e-492c-adef-691d508d4ae1

include/db.h

@@ -283,6 +283,7 @@ int db_env_set_func_malloc (void *(*)(size_t)) __attribute__((__visibility__("de
 int db_env_set_func_pwrite (ssize_t (*)(int, const void *, size_t, toku_off_t)) __attribute__((__visibility__("default")));
 int db_env_set_func_write (ssize_t (*)(int, const void *, size_t)) __attribute__((__visibility__("default")));
 int db_env_set_func_realloc (void *(*)(void*, size_t)) __attribute__((__visibility__("default")));
+void db_env_set_checkpoint_callback (void (*)(void*), void*) __attribute__((__visibility__("default")));
 #if defined(__cplusplus)
 }
 #endif

src/export.map

@@ -11,6 +11,7 @@
    db_env_set_func_free;
    db_env_set_func_pwrite;
    db_env_set_func_write;
+   db_env_set_checkpoint_callback;
 
    toku_os_get_max_rss;
 

src/ydb.c

@@ -694,9 +694,13 @@ static int toku_env_set_verbose(DB_ENV * env, u_int32_t which, int onoff) {
     return 1;
 }
 
+// For test purposes only.
+static void (*checkpoint_callback_f)(void*) = NULL;
+static void * checkpoint_callback_extra     = NULL;
+
 static int toku_env_txn_checkpoint(DB_ENV * env, u_int32_t kbyte __attribute__((__unused__)), u_int32_t min __attribute__((__unused__)), u_int32_t flags __attribute__((__unused__))) {
     char *error_string = NULL;
-    int r = toku_checkpoint(env->i->cachetable, env->i->logger, &error_string, NULL, NULL);
+    int r = toku_checkpoint(env->i->cachetable, env->i->logger, &error_string, checkpoint_callback_f, checkpoint_callback_extra);
     if (r) {
 	env->i->is_panicked = r; // Panicking the whole environment may be overkill, but I'm not sure what else to do.
 	env->i->panic_string = error_string;
@@ -3810,3 +3814,10 @@ void setup_dlmalloc (void) {
     db_env_set_func_realloc(dlrealloc);
     db_env_set_func_free(dlfree);
 }
+
+// For test purposes only.
+// With this interface, all checkpoint users get the same callback and the same extra.
+void db_env_set_checkpoint_callback (void (*callback_f)(void*), void* extra) {
+    checkpoint_callback_f = callback_f;
+    checkpoint_callback_extra = extra;
+}