glibmm: Glib::MainContext Class Reference
Main context. More...
#include <glibmm/main.h>
Public Types |
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using | CppObjectType = Glib::MainContext |
using | BaseObjectType = GMainContext |
Public Member Functions |
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MainContext (const MainContext & other)=delete | |
MainContext & | operator= (const MainContext & other)=delete |
bool | iteration (bool may_block) |
Runs a single iteration for the given main loop.
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bool | pending () |
Checks if any sources have pending events for the given context.
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void | wakeup () |
If context is currently waiting in a poll(), interrupt the poll(), and continue the iteration process.
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bool | acquire () |
Tries to become the owner of the specified context.
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bool | wait ( Glib::Cond & cond, Glib::Mutex & mutex) |
Tries to become the owner of the specified context, as with
acquire()
.
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bool | wait ( Glib::Threads::Cond & cond, Glib::Threads::Mutex & mutex) |
Tries to become the owner of the specified context, as with
acquire()
.
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void | release () |
Releases ownership of a context previously acquired by this thread with
acquire()
.
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bool | prepare (int& priority) |
Prepares to poll sources within a main loop.
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bool | prepare () |
Prepares to poll sources within a main loop.
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void | query (int max_priority, int& timeout, std::vector < PollFD >& fds) |
Determines information necessary to poll this main loop.
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bool | check (int max_priority, std::vector < PollFD >& fds) |
Passes the results of polling back to the main loop.
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void | dispatch () |
Dispatches all pending sources.
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void | set_poll_func (GPollFunc poll_func) |
Sets the function to use to handle polling of file descriptors.
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GPollFunc | get_poll_func () |
Gets the poll function set by g_main_context_set_poll_func().
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void | add_poll ( PollFD & fd, int priority) |
Adds a file descriptor to the set of file descriptors polled for this context.
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void | remove_poll ( PollFD & fd) |
Removes file descriptor from the set of file descriptors to be polled for a particular context.
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void | invoke (const sigc::slot < bool >& slot, int priority= PRIORITY_DEFAULT ) |
Invokes a function in such a way that this
MainContext
is owned during the invocation of
slot
.
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SignalTimeout | signal_timeout () |
Timeout signal, attached to this
MainContext
.
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SignalIdle | signal_idle () |
Idle signal, attached to this
MainContext
.
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SignalIO | signal_io () |
I/O signal, attached to this
MainContext
.
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SignalChildWatch | signal_child_watch () |
child watch signal, attached to this
MainContext
.
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void | reference () const |
void | unreference () const |
GMainContext* | gobj () |
const GMainContext* | gobj () const |
GMainContext* | gobj_copy () const |
Static Public Member Functions |
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static Glib::RefPtr < MainContext > | create () |
Creates a new
MainContext
.
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static Glib::RefPtr < MainContext > | get_default () |
Returns the default main context.
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Related Functions |
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(Note that these are not member functions.) |
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Glib::RefPtr < MainContext > | wrap (GMainContext* gobject, bool take_copy=false) |
Detailed Description
Main context.
Member Typedef Documentation
using Glib::MainContext::BaseObjectType = GMainContext |
Constructor & Destructor Documentation
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delete |
Member Function Documentation
bool Glib::MainContext::acquire | ( | ) |
Tries to become the owner of the specified context.
If some other thread is the owner of the context, returns
false
immediately. Ownership is properly recursive: the owner can require ownership again and will release ownership when
release()
is called as many times as
acquire()
. You must be the owner of a context before you can call
prepare()
,
query()
,
check()
,
dispatch()
.
- Returns
- true if the operation succeeded, and this thread is now the owner of context.
void Glib::MainContext::add_poll | ( | PollFD & | fd , |
int | priority | ||
) |
Adds a file descriptor to the set of file descriptors polled for this context.
This will very seldomly be used directly. Instead a typical event source will use Glib::Source::add_poll() instead.
- Parameters
-
fd A PollFD structure holding information about a file descriptor to watch. priority The priority for this file descriptor which should be the same as the priority used for Glib::Source::attach() to ensure that the file descriptor is polled whenever the results may be needed.
bool Glib::MainContext::check | ( | int | max_priority , |
std::vector < PollFD >& | fds | ||
) |
Passes the results of polling back to the main loop.
- Parameters
-
max_priority Maximum numerical priority of sources to check. fds Vector of Glib::PollFD 's that was passed to the last call to query()
- Returns
- true if some sources are ready to be dispatched.
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static |
Creates a new MainContext .
- Returns
- The new MainContext .
void Glib::MainContext::dispatch | ( | ) |
Dispatches all pending sources.
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static |
Returns the default main context.
This is the main context used for main loop functions when a main loop is not explicitly specified.
- Returns
- The new MainContext .
GPollFunc Glib::MainContext::get_poll_func | ( | ) |
Gets the poll function set by g_main_context_set_poll_func().
- Returns
- The poll function
GMainContext* Glib::MainContext::gobj | ( | ) |
const GMainContext* Glib::MainContext::gobj | ( | ) | const |
GMainContext* Glib::MainContext::gobj_copy | ( | ) | const |
void Glib::MainContext::invoke | ( | const sigc::slot < bool > & | slot , |
int |
priority
=
PRIORITY_DEFAULT
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) |
Invokes a function in such a way that this MainContext is owned during the invocation of slot .
If the context is owned by the current thread, slot is called directly. Otherwise, if the context is the thread-default main context of the current thread and acquire() succeeds, then slot is called and release() is called afterwards.
In any other case, an idle source is created to call slot and that source is attached to the context (presumably to be run in another thread).
Note that, as with normal idle functions,
slot
should probably return
false
. If it returns
true
, it will be continuously run in a loop (and may prevent this call from returning).
If an idle source is created to call slot , invoke() may return before slot is called.
Because sigc::trackable is not thread-safe, if the slot represents a non-static method of a class deriving from sigc::trackable , and the slot is created by sigc::mem_fun() , invoke() should only be called from the thread where the context runs. You can use, say, boost::bind() or, in C++11, std::bind() or a C++11 lambda expression instead of sigc::mem_fun() .
- Parameters
-
slot A slot to call. priority The priority of the idle source, if one is created.
bool Glib::MainContext::iteration | ( | bool | may_block | ) |
Runs a single iteration for the given main loop.
This involves checking to see if any event sources are ready to be processed, then if no events sources are ready and may_block is true, waiting for a source to become ready, then dispatching the highest priority events sources that are ready. Note that even when may_block is true, it is still possible for iteration() to return false, since the the wait may be interrupted for other reasons than an event source becoming ready.
- Parameters
-
may_block Whether the call may block.
- Returns
- true if events were dispatched.
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delete |
bool Glib::MainContext::pending | ( | ) |
Checks if any sources have pending events for the given context.
- Returns
- true if events are pending.
bool Glib::MainContext::prepare | ( | int & | priority | ) |
Prepares to poll sources within a main loop.
The resulting information for polling is determined by calling query() .
- Parameters
-
priority Location to store priority of highest priority source already ready.
- Returns
- true if some source is ready to be dispatched prior to polling.
bool Glib::MainContext::prepare | ( | ) |
Prepares to poll sources within a main loop.
The resulting information for polling is determined by calling query() .
- Returns
- true if some source is ready to be dispatched prior to polling.
void Glib::MainContext::query | ( | int | max_priority , |
int & | timeout , | ||
std::vector < PollFD >& | fds | ||
) |
Determines information necessary to poll this main loop.
- Parameters
-
max_priority Maximum priority source to check. timeout Location to store timeout to be used in polling. fds Location to store Glib::PollFD records that need to be polled.
- Returns
- the number of records actually stored in fds, or, if more than n_fds records need to be stored, the number of records that need to be stored.
void Glib::MainContext::reference | ( | ) | const |
void Glib::MainContext::release | ( | ) |
void Glib::MainContext::remove_poll | ( | PollFD & | fd | ) |
Removes file descriptor from the set of file descriptors to be polled for a particular context.
- Parameters
-
fd A PollFD structure holding information about a file descriptor.
void Glib::MainContext::set_poll_func | ( | GPollFunc | poll_func | ) |
Sets the function to use to handle polling of file descriptors.
It will be used instead of the poll() system call (or GLib's replacement function, which is used where poll() isn't available). This function could possibly be used to integrate the GLib event loop with an external event loop.
- Parameters
-
poll_func The function to call to poll all file descriptors.
SignalChildWatch Glib::MainContext::signal_child_watch | ( | ) |
child watch signal, attached to this MainContext .
- Returns
- A signal proxy; you want to use SignalChildWatch::connect() .
SignalIdle Glib::MainContext::signal_idle | ( | ) |
Idle signal, attached to this MainContext .
- Returns
- A signal proxy; you want to use SignalIdle::connect() .
SignalIO Glib::MainContext::signal_io | ( | ) |
I/O signal, attached to this MainContext .
- Returns
- A signal proxy; you want to use SignalIO::connect() .
SignalTimeout Glib::MainContext::signal_timeout | ( | ) |
Timeout signal, attached to this MainContext .
- Returns
- A signal proxy; you want to use SignalTimeout::connect() .
void Glib::MainContext::unreference | ( | ) | const |
bool Glib::MainContext::wait | ( | Glib::Cond & | cond , |
Glib::Mutex & | mutex | ||
) |
Tries to become the owner of the specified context, as with acquire() .
But if another thread is the owner, atomically drop mutex and wait on cond until that owner releases ownership or until cond is signaled, then try again (once) to become the owner.
- Parameters
-
cond A condition variable. mutex A mutex, currently held.
- Returns
- true if the operation succeeded, and this thread is now the owner of context.
bool Glib::MainContext::wait | ( | Glib::Threads::Cond & | cond , |
Glib::Threads::Mutex & | mutex | ||
) |
Tries to become the owner of the specified context, as with acquire() .
But if another thread is the owner, atomically drop mutex and wait on cond until that owner releases ownership or until cond is signaled, then try again (once) to become the owner.
- Parameters
-
cond A condition variable. mutex A mutex, currently held.
- Returns
- true if the operation succeeded, and this thread is now the owner of context.
- Deprecated:
- Please use the underlying g_main_context_wait() function if you really need this functionality.
void Glib::MainContext::wakeup | ( | ) |
If context is currently waiting in a poll(), interrupt the poll(), and continue the iteration process.