Mutex

Mutual exclusion. More...

Collaboration diagram for Mutex:

Functions
GF_Mutex *	gf_mx_new (const char *name)
	mutex constructor More...
void	gf_mx_del (GF_Mutex *mx)
	mutex denstructor More...
u32	gf_mx_p (GF_Mutex *mx)
	mutex locking More...
void	gf_mx_v (GF_Mutex *mx)
	mutex unlocking More...
Bool	gf_mx_try_lock (GF_Mutex *mx)
	mutex non-blocking lock More...
s32	gf_mx_get_num_locks (GF_Mutex *mx)
	get mutex number of locks More...

Detailed Description

Mutual exclusion.

The mutex object allows ensuring that portions of the code (typically access to variables) cannot be executed by two threads (or a thread and the main process) at the same time.

Function Documentation

gf_mx_new()

GF_Mutex* gf_mx_new

(

const char *

name

)

mutex constructor

Contructs a new mutex object

Parameters

name	log name of the thread if any

Returns

new mutex

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gf_mx_del()

void gf_mx_del

(

GF_Mutex *

mx

)

mutex denstructor

Destroys a mutex object. This will wait for the mutex to be released if needed.

Parameters

mx	the mutex object, may be NULL

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gf_mx_p()

u32 gf_mx_p

(

GF_Mutex *

mx

)

mutex locking

Locks the mutex object, making sure that another thread locking this mutex cannot execute until the mutex is unlocked.

Parameters

mx	the mutex object, may be NULL

Returns

1 if success or mutex is NULL, 0 if error locking the mutex (which should never happen)

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gf_mx_v()

void gf_mx_v

(

GF_Mutex *

mx

)

mutex unlocking

Unlocks the mutex object, allowing other threads waiting on this mutex to continue their execution

Parameters

mx	the mutex object, may be NULL

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gf_mx_try_lock()

Bool gf_mx_try_lock

(

GF_Mutex *

mx

)

mutex non-blocking lock

Attemps to lock the mutex object without blocking until the object is released.

Parameters

mx	the mutex object, may be NULL

Returns

GF_TRUE if the mutex has been successfully locked or if the mutex is NULL, in which case it shall then be unlocked, or GF_FALSE if the mutex is locked by another thread.

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gf_mx_get_num_locks()

s32 gf_mx_get_num_locks

(

GF_Mutex *

mx

)

get mutex number of locks

Returns the number of locks on the mutex if the caller thread is holding the mutex.

Parameters

mx	the mutex object, may be NULL

Returns

-1 if the mutex is not hold by the calling thread, or the number of locks (possibly 0) otherwise. Returns 0 if mutex is NULL

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