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libcamera: bound_method: Define connection type for method invocation

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Define an enumeration of connection types to describe the delivery
method of signals and method invocation.

Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
This commit is contained in:
Jacopo Mondi 2019-10-27 02:28:40 +02:00 • committed by Laurent Pinchart
parent 66e7c5b774
commit 1e2db0eee7
3 changed files with 42 additions and 3 deletions
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4
Documentation/Doxyfile.in
View file

@ -837,9 +837,7 @@ RECURSIVE = YES
# Note that relative paths are relative to the directory from which doxygen is
# run.
EXCLUDE = @TOP_SRCDIR@/include/libcamera/bound_method.h \
@TOP_SRCDIR@/src/libcamera/bound_method.cpp \
@TOP_SRCDIR@/src/libcamera/device_enumerator_sysfs.cpp \
EXCLUDE = @TOP_SRCDIR@/src/libcamera/device_enumerator_sysfs.cpp \
@TOP_SRCDIR@/src/libcamera/device_enumerator_udev.cpp \
@TOP_SRCDIR@/src/libcamera/include/device_enumerator_sysfs.h \
@TOP_SRCDIR@/src/libcamera/include/device_enumerator_udev.h \

7
include/libcamera/bound_method.h
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@ -14,6 +14,13 @@ namespace libcamera {
class Object;
enum ConnectionType {
ConnectionTypeAuto,
ConnectionTypeDirect,
ConnectionTypeQueued,
ConnectionTypeBlocking,
};
class BoundMethodBase
{
public:

34
src/libcamera/bound_method.cpp
View file

@ -11,8 +11,42 @@
#include "thread.h"
#include "utils.h"
/**
* \file bound_method.h
* \brief Method bind and invocation
*/
namespace libcamera {
/**
* \enum ConnectionType
* \brief Connection type for asynchronous communication
*
* This enumeration describes the possible types of asynchronous communication
* between a sender and a receiver. It applies to Signal::emit() and
* Object::invokeMethod().
*
* \var ConnectionType::ConnectionTypeAuto
* \brief If the sender and the receiver live in the same thread,
* ConnectionTypeDirect is used. Otherwise ConnectionTypeQueued is used.
*
* \var ConnectionType::ConnectionTypeDirect
* \brief The receiver is invoked immediately and synchronously in the sender's
* thread.
*
* \var ConnectionType::ConnectionTypeQueued
* \brief The receiver is invoked asynchronously in its thread when control
* returns to the thread's event loop. The sender proceeds without waiting for
* the invocation to complete.
*
* \var ConnectionType::ConnectionTypeBlocking
* \brief The receiver is invoked asynchronously in its thread when control
* returns to the thread's event loop. The sender blocks until the receiver
* signals the completion of the invocation. This connection type shall not be
* used when the sender and receiver live in the same thread, otherwise
* deadlock will occur.
*/
void BoundMethodBase::activatePack(void *pack)
{
if (Thread::current() == object_->thread()) {