On Sun, 2010-05-16 at 03:06 +0545, vikas chauhan wrote: > Hi, > Can any one tell me, what are the > functions try_module_get and module_put used for ? I couldn't find any > documentation by googling. > The implementation of try_module_get can be found in file include/linux/module.h (it is an inline function). The implementation of module_put can be found in kernel/module.c Dynamically-inserted kernel modules are reference-counted, so that a call to "rmmod" will fail if the reference-count is not zero, ie if the module is still in use. Function module_get increments the reference count of a module; once this has returned success then the calling code can rely on the specified module *not* being unloaded. When the caller no longer needs that module, then module_put must be called to decrement the reference count. Well, the reference-counting scheme is slightly more complicated than just a single integer (it keeps per-cpu "incs" and "decs" counts). But the effect is the same. Regards, Simon -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
