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loader: Remove global symbol only startup phase.

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Dependency loader is now in place so we no longer need a separate loader
phase for global symbols only.  This simplifies the loader and allows us
to minimize calls to dlopen.

Change-Id: I33e3174d67f3b4552d3d536326dcaf0ebabb097d
This commit is contained in:
Corey Farrell
2017-12-09 00:30:43 -05:00
parent 3b73ed28c5
commit a80cbb046e
1 changed files with 15 additions and 47 deletions
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62
main/loader.c
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@@ -798,8 +798,6 @@ static void unload_dynamic_module(struct ast_module *mod)
#endif
}
#define MODULE_LOCAL_ONLY (void *)-1
/*!
* \internal
* \brief Attempt to dlopen a module.
@@ -846,12 +844,11 @@ static struct ast_module *load_dlopen(const char *resource_in, const char *so_ex
return mod;
}
static struct ast_module *load_dynamic_module(const char *resource_in, unsigned int global_symbols_only, unsigned int suppress_logging)
static struct ast_module *load_dynamic_module(const char *resource_in, unsigned int suppress_logging)
{
char fn[PATH_MAX];
struct ast_module *mod;
size_t resource_in_len = strlen(resource_in);
int exports_globals;
const char *so_ext = "";
if (resource_in_len < 4 || strcasecmp(resource_in + resource_in_len - 3, ".so")) {
@@ -860,31 +857,18 @@ static struct ast_module *load_dynamic_module(const char *resource_in, unsigned
snprintf(fn, sizeof(fn), "%s/%s%s", ast_config_AST_MODULE_DIR, resource_in, so_ext);
/* Try loading in quiet mode first with flags to export global symbols.
* If the module does not want to export globals we will close and reopen. */
mod = load_dlopen(resource_in, so_ext, fn,
global_symbols_only ? RTLD_NOW | RTLD_GLOBAL : RTLD_NOW | RTLD_LOCAL,
suppress_logging);
/* Try loading in quiet mode first with RTLD_LOCAL. The majority of modules do not
* export symbols so this allows the least number of calls to dlopen. */
mod = load_dlopen(resource_in, so_ext, fn, RTLD_NOW | RTLD_LOCAL, suppress_logging);
if (!mod) {
return NULL;
}
exports_globals = ast_test_flag(mod->info, AST_MODFLAG_GLOBAL_SYMBOLS);
if ((global_symbols_only && exports_globals) || (!global_symbols_only && !exports_globals)) {
/* The first dlopen had the correct flags. */
if (!mod || !ast_test_flag(mod->info, AST_MODFLAG_GLOBAL_SYMBOLS)) {
return mod;
}
/* Close the module so we can reopen with correct flags. */
logged_dlclose(resource_in, mod->lib);
if (global_symbols_only) {
return MODULE_LOCAL_ONLY;
}
return load_dlopen(resource_in, so_ext, fn,
exports_globals ? RTLD_NOW | RTLD_GLOBAL : RTLD_NOW | RTLD_LOCAL,
0);
return load_dlopen(resource_in, so_ext, fn, RTLD_NOW | RTLD_GLOBAL, 0);
}
int modules_shutdown(void)
@@ -1437,7 +1421,7 @@ static enum ast_module_load_result start_resource(struct ast_module *mod)
*
* If the module_vector is not provided, the module's load function will be executed
* immediately */
static enum ast_module_load_result load_resource(const char *resource_name, unsigned int global_symbols_only, unsigned int suppress_logging, struct module_vector *resource_heap, int required)
static enum ast_module_load_result load_resource(const char *resource_name, unsigned int suppress_logging, struct module_vector *resource_heap, int required)
{
struct ast_module *mod;
enum ast_module_load_result res = AST_MODULE_LOAD_SUCCESS;
@@ -1447,17 +1431,9 @@ static enum ast_module_load_result load_resource(const char *resource_name, unsi
ast_log(LOG_WARNING, "Module '%s' already exists.\n", resource_name);
return AST_MODULE_LOAD_DECLINE;
}
if (global_symbols_only && !ast_test_flag(mod->info, AST_MODFLAG_GLOBAL_SYMBOLS))
return AST_MODULE_LOAD_SKIP;
} else {
mod = load_dynamic_module(resource_name, global_symbols_only, suppress_logging);
if (mod == MODULE_LOCAL_ONLY) {
return AST_MODULE_LOAD_SKIP;
}
mod = load_dynamic_module(resource_name, suppress_logging);
if (!mod) {
if (!global_symbols_only) {
ast_log(LOG_WARNING, "Module '%s' could not be loaded.\n", resource_name);
}
return required ? AST_MODULE_LOAD_FAILURE : AST_MODULE_LOAD_DECLINE;
}
@@ -1500,7 +1476,7 @@ int ast_load_resource(const char *resource_name)
{
int res;
AST_DLLIST_LOCK(&module_list);
res = load_resource(resource_name, 0, 0, NULL, 0);
res = load_resource(resource_name, 0, NULL, 0);
if (!res) {
ast_test_suite_event_notify("MODULE_LOAD", "Message: %s", resource_name);
}
@@ -1657,7 +1633,7 @@ static int start_resource_list(struct module_vector *resources, int *mod_count)
/*! loads modules in order by load_pri, updates mod_count
\return -1 on failure to load module, -2 on failure to load required module, otherwise 0
*/
static int load_resource_list(struct load_order *load_order, unsigned int global_symbols, int *mod_count)
static int load_resource_list(struct load_order *load_order, int *mod_count)
{
struct module_vector resource_heap;
struct load_order_entry *order;
@@ -1680,8 +1656,8 @@ static int load_resource_list(struct load_order *load_order, unsigned int global
enum ast_module_load_result lres;
/* Suppress log messages unless this is the last pass */
lres = load_resource(order->resource, global_symbols, 1, &resource_heap, order->required);
ast_debug(3, "PASS 0: %-46s %d %d\n", order->resource, lres, global_symbols);
lres = load_resource(order->resource, 1, &resource_heap, order->required);
ast_debug(3, "PASS 0: %-46s %d\n", order->resource, lres);
switch (lres) {
case AST_MODULE_LOAD_SUCCESS:
/* We're supplying a heap so SUCCESS isn't possible but we still have to test for it. */
@@ -1719,8 +1695,8 @@ static int load_resource_list(struct load_order *load_order, unsigned int global
enum ast_module_load_result lres;
/* Suppress log messages unless this is the last pass */
lres = load_resource(order->resource, global_symbols, (i < LOAD_RETRIES - 1), &resource_heap, order->required);
ast_debug(3, "PASS %d %-46s %d %d\n", i + 1, order->resource, lres, global_symbols);
lres = load_resource(order->resource, (i < LOAD_RETRIES - 1), &resource_heap, order->required);
ast_debug(3, "PASS %d %-46s %d\n", i + 1, order->resource, lres);
switch (lres) {
/* These are all retryable. */
case AST_MODULE_LOAD_SUCCESS:
@@ -1873,15 +1849,7 @@ int load_modules(unsigned int preload_only)
if (load_count)
ast_log(LOG_NOTICE, "%u modules will be loaded.\n", load_count);
/* first, load only modules that provide global symbols */
if ((res = load_resource_list(&load_order, 1, &modulecount)) < 0) {
goto done;
}
/* now load everything else */
if ((res = load_resource_list(&load_order, 0, &modulecount)) < 0) {
goto done;
}
res = load_resource_list(&load_order, &modulecount);
done:
while ((order = AST_LIST_REMOVE_HEAD(&load_order, entry))) {