what's this mean .count = ATOMIC_INIT(n), ?

[baumann@pan]

hi all,

while i am reading the linux codes, i found lot as below

#define __SEMAPHORE_INITIALIZER(name, n) \
{ \
.count = ATOMIC_INIT(n), \
.waking = ATOMIC_INIT(0), \
.wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \
}

i never see .count, .walking, .wait usage in ms windows 's source code.

is it linux gcc specific? or c99 has defined its usage?

 

[Prawit Chaivong]

hi all,

while i am reading the linux codes, i found lot as below

#define __SEMAPHORE_INITIALIZER(name, n) \
{ \
.count = ATOMIC_INIT(n), \
.waking = ATOMIC_INIT(0), \
.wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \
}

i never see .count, .walking, .wait usage in ms windows 's source code.

is it linux gcc specific? or c99 has defined its usage?

This is macro, I'd have thought that this would be an assembly
language.
And this macro would be used in inline-assembly part.

Just guess.

 

[Me]

while i am reading the linux codes, i found lot as below

#define __SEMAPHORE_INITIALIZER(name, n) \
{ \
.count = ATOMIC_INIT(n), \
.waking = ATOMIC_INIT(0), \
.wait = __WAIT_QUEUE_HEAD_INITIALIZER((name).wait) \
}

i never see .count, .walking, .wait usage in ms windows 's source code.

Looks like it's C99's designated initializer syntax:
http://www.dmk.com/c/init.html
http://www.dmk.com/c/lit.html