freebsd_network: Remove the need for <kernel_c++_structs.h>.

Use sizeof()+roundup() to build a char[] of the correct size,
and add a static_assert to ensure it stays so.

The <kernel_c++_structs.h> header needs to have its dependency
manually declared, and not all consumers of this file properly
declared it as such. This then fixes a concurrent build problem.

Fixes #17965 as this was the only consumer of this header.

freebsd_network: Add some missing __BEGIN_DECLS/__END_DECLS.

freebsd11_network -> freebsd_network.

FreeBSD 12 has no major changes to the ifnet KPIs that constitute a
source compatibility break, save a single one related to locking
which doesn't really apply to us, and so we don't need to create
a "freebsd12_network" directory to work through the upgrades.

Making use of the C++ structures in C only code feature introduced with
r34441. This allows to completely stick to FreeBSD's conditional cv_* function
semantics as 'struct cv' variables are freed automatically now.
This also gets rid of the dynamically de-/allocating of ConditionalVariables.
Thank you Ingo for helping me through this.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34489 a95241bf-73f2-0310-859d-f6bbb57e9c96

Refactoring condition variable subsystem of FreeBSD compat layer. Basically it
separates the usage of published and unpublished ConditionalVariables into
different functions.
This allows to stick to the semantics of FreeBSD's condition variable subsystem
where it isn't needed to call cv_destroy. With the refactoring now there aren't
orphaned published ConditionalVariable left over, when shutting down the compat
layer.
Though, allocated unpublished struct cv's aren't cleaned up yet. This will be
addressed in a next commit.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34468 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Refactoring the condition variable and synchronization subsystem of the
freebsd compat layer.
* Renaming functions where their names aren't preset by FreeBSD to stick
to the coding style guidelines.
* Making use of static Notify functions of Haiku's ConditionalVariable
implementation.
* Removing management of used ConditionalVariables within the compat layer.
This should also fix #5072.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34461 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Getting rid of the necessity for cleaning up initialized ConditionalVariables
in uninit_condition_variables(). This method and its counterpart
init_condition_variables() will be removed, once the need for the
sConditionVariableHash will be eliminated.
* Now every initialized ConditionalVariable gets removed right after it is no
longer needed. Ingo what do you think?
* This behaviour matches with the FreeBSD way, where a conditional variable
gets assigned to a sleepqueue only when needed, and is removed from that
sleepqueue the moment the condition is met.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34427 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Completing the condition variable subsystem. Thanks to ingo for the heads
up.
* Removed the cv_waiters structure member as it is nowhere used in the network
subsytem by FreeBSD either.
* Removing the sleepqueue dummy functions completely, as Haiku's condition
variable subsystem is well suited for this purpose.
* This fixes the build, too, as it introduces the new implementation of pause
and _pause.
* Implementing the msleep and wakeup functions based on the condition variable
implementation.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34395 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Basically reimplemented the conditional variable support, so that it is now
easier to a) cleanup on driver unloading and b) to implement the msleep
and wakeup functions. This is facilitated by keeping track of used
conditional variables in a hash table. Also this table can be used to get
the conditional variable belonging to a hash, which isn't supported by
Haiku's conditional variable support at the moment.
All network drivers are compiling and linking but it needs to be tested,
whether executing rises any issues.
* Minor coding style cleanup in condvar.h regarding intersection spacing.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34375 a95241bf-73f2-0310-859d-f6bbb57e9c96

* reordering of headerfile inclusion to comply to FreeBSD 8
ordering.
this makes porting driver (especially wifi ones) more
convinient
* based on FreeBSD svn revision 196691

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33739 a95241bf-73f2-0310-859d-f6bbb57e9c96

Making use of the C++ structures in C only code feature introduced with
r34441. This allows to completely stick to FreeBSD's conditional cv_* function
semantics as 'struct cv' variables are freed automatically now.
This also gets rid of the dynamically de-/allocating of ConditionalVariables.
Thank you Ingo for helping me through this.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34489 a95241bf-73f2-0310-859d-f6bbb57e9c96

Refactoring condition variable subsystem of FreeBSD compat layer. Basically it
separates the usage of published and unpublished ConditionalVariables into
different functions.
This allows to stick to the semantics of FreeBSD's condition variable subsystem
where it isn't needed to call cv_destroy. With the refactoring now there aren't
orphaned published ConditionalVariable left over, when shutting down the compat
layer.
Though, allocated unpublished struct cv's aren't cleaned up yet. This will be
addressed in a next commit.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34468 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Refactoring the condition variable and synchronization subsystem of the
freebsd compat layer.
* Renaming functions where their names aren't preset by FreeBSD to stick
to the coding style guidelines.
* Making use of static Notify functions of Haiku's ConditionalVariable
implementation.
* Removing management of used ConditionalVariables within the compat layer.
This should also fix #5072.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34461 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Getting rid of the necessity for cleaning up initialized ConditionalVariables
in uninit_condition_variables(). This method and its counterpart
init_condition_variables() will be removed, once the need for the
sConditionVariableHash will be eliminated.
* Now every initialized ConditionalVariable gets removed right after it is no
longer needed. Ingo what do you think?
* This behaviour matches with the FreeBSD way, where a conditional variable
gets assigned to a sleepqueue only when needed, and is removed from that
sleepqueue the moment the condition is met.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34427 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Completing the condition variable subsystem. Thanks to ingo for the heads
up.
* Removed the cv_waiters structure member as it is nowhere used in the network
subsytem by FreeBSD either.
* Removing the sleepqueue dummy functions completely, as Haiku's condition
variable subsystem is well suited for this purpose.
* This fixes the build, too, as it introduces the new implementation of pause
and _pause.
* Implementing the msleep and wakeup functions based on the condition variable
implementation.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34395 a95241bf-73f2-0310-859d-f6bbb57e9c96

* Basically reimplemented the conditional variable support, so that it is now
easier to a) cleanup on driver unloading and b) to implement the msleep
and wakeup functions. This is facilitated by keeping track of used
conditional variables in a hash table. Also this table can be used to get
the conditional variable belonging to a hash, which isn't supported by
Haiku's conditional variable support at the moment.
All network drivers are compiling and linking but it needs to be tested,
whether executing rises any issues.
* Minor coding style cleanup in condvar.h regarding intersection spacing.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@34375 a95241bf-73f2-0310-859d-f6bbb57e9c96

* reordering of headerfile inclusion to comply to FreeBSD 8
ordering.
this makes porting driver (especially wifi ones) more
convinient
* based on FreeBSD svn revision 196691

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@33739 a95241bf-73f2-0310-859d-f6bbb57e9c96