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module: Support auto enabling and enforce single registration of module

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Enforces a single registration of a module with a subsystem.
module_register() now returns -EBUSY if module is already
registered.

Adds support for BMON_MODULE_AUTO to flag modules that should
be autoloaded upon the first call to module_set(). Loading
will succeed if the probe() function succeeds.
This commit is contained in:
Thomas Graf
2013-07-13 13:05:20 +02:00
parent 2c047d2af3
commit 509d64bd18
2 changed files with 31 additions and 14 deletions
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10
include/bmon/module.h
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@ -29,8 +29,11 @@
#include <bmon/bmon.h>
#include <bmon/conf.h>
#define BMON_MODULE_ENABLED 1
#define BMON_MODULE_DEFAULT 2
#define BMON_MODULE_ENABLED (1 << 0) /* Enabled */
#define BMON_MODULE_DEFAULT (1 << 1) /* Suitable as default */
#define BMON_MODULE_AUTO (1 << 2) /* Auto enable */
struct bmon_subsys;
struct bmon_module
{
@ -48,6 +51,7 @@ struct bmon_module
int m_flags;
struct list_head m_list;
struct bmon_subsys *m_subsys;
};
struct bmon_subsys
@ -65,7 +69,7 @@ extern void module_foreach_run_enabled_pre(struct bmon_subsys *);
extern void module_foreach_run_enabled(struct bmon_subsys *);
extern void module_foreach_run_enabled_post(struct bmon_subsys *);
extern void module_register(struct bmon_subsys *, struct bmon_module *);
extern int module_register(struct bmon_subsys *, struct bmon_module *);
extern int module_set(struct bmon_subsys *, const char *);
extern void module_init(void);