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Commit 37b725d5 authored by Davis King's avatar Davis King
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Filled out the BSP spec

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dlib/bsp/bsp_abstract.h
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...@@ -15,6 +15,25 @@ namespace dlib ...@@ -15,6 +15,25 @@ namespace dlib
{ {
/*! /*!
WHAT THIS OBJECT REPRESENTS WHAT THIS OBJECT REPRESENTS
This is a tool used to implement algorithms using the Bulk Synchronous
Parallel (BSP) computing model. A BSP algorithm is composed of a number of
processing nodes, each executing in parallel. The general flow of
execution in each processing node is the following:
1. Do work locally on some data.
2. Send some messages to other nodes.
3. Receive messages from other nodes.
4. Go to step 1 or terminate if complete.
To do this, each processing node needs an API used to send and receive
messages. This API is implemented by the bsp_connect object which provides
these services to a BSP node.
Note that BSP processing nodes are spawned using the bsp_connect() and
bsp_listen() routines defined at the bottom of this file. For example, to
start a BSP algorithm consisting of N processing nodes, you would make N-1
calls to bsp_listen() and one call to bsp_connect(). The call to
bsp_connect() then initiates the computation on all nodes.
THREAD SAFETY THREAD SAFETY
This object is not thread-safe. This means you must serialize all access This object is not thread-safe. This means you must serialize all access
...@@ -36,6 +55,12 @@ namespace dlib ...@@ -36,6 +55,12 @@ namespace dlib
- target_node_id != node_id() - target_node_id != node_id()
ensures ensures
- sends a copy of item to the node with the given id. - sends a copy of item to the node with the given id.
throws
- dlib::socket_error:
This exception is thrown if there is an error which prevents us from
delivering the message to the given node. One way this might happen is
if the target node has already terminated its execution or has lost
network connectivity.
!*/ !*/
template <typename T> template <typename T>
...@@ -44,7 +69,14 @@ namespace dlib ...@@ -44,7 +69,14 @@ namespace dlib
); );
/*! /*!
ensures ensures
- sends a copy of item to all other processing nodes. - item is serializable
- sends a copy of item to all other processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents us from
delivering a message to one of the other nodes. This might happen, for
example, if one of the nodes has terminated its execution or has lost
network connectivity.
!*/ !*/
unsigned long node_id ( unsigned long node_id (
...@@ -54,16 +86,16 @@ namespace dlib ...@@ -54,16 +86,16 @@ namespace dlib
- Returns the id of the current processing node. That is, - Returns the id of the current processing node. That is,
returns a number N such that: returns a number N such that:
- N < number_of_nodes() - N < number_of_nodes()
- N == the node id of the processing node that called - N == the node id of the processing node that called node_id(). This
node_id(). is a number that uniquely identifies the processing node.
!*/ !*/
unsigned long number_of_nodes ( unsigned long number_of_nodes (
) const; ) const;
/*! /*!
ensures ensures
- returns the number of processing nodes participating in the - returns the number of processing nodes participating in the BSP
BSP computation. computation.
!*/ !*/
template <typename T> template <typename T>
...@@ -71,13 +103,26 @@ namespace dlib ...@@ -71,13 +103,26 @@ namespace dlib
T& item T& item
); );
/*! /*!
requires
- item is serializable
ensures ensures
- if (this function returns true) then - if (this function returns true) then
- #item == the next message which was sent to the calling processing - #item == the next message which was sent to the calling processing
node. node.
- else - else
- There were no other messages to receive and all other processing - There were no other messages to receive and all other processing
nodes are blocked on calls to receive(). nodes are blocked on calls to receive() or have terminated. That is,
receive() waits for all other nodes to be in a state which can't
generate new messages before it returns false).
throws
- dlib::socket_error:
This exception is thrown if some error occurs which prevents us from
communicating with other processing nodes.
- dlib::serialization_error or any exception thrown by the global
deserialize(T) routine:
This is thrown if there is a problem in deserialize(). This might
happen if the message sent doesn't match the type T expected by
receive().
!*/ !*/
template <typename T> template <typename T>
...@@ -86,6 +131,8 @@ namespace dlib ...@@ -86,6 +131,8 @@ namespace dlib
unsigned long& sending_node_id unsigned long& sending_node_id
); );
/*! /*!
requires
- item is serializable
ensures ensures
- if (this function returns true) then - if (this function returns true) then
- #item == the next message which was sent to the calling processing - #item == the next message which was sent to the calling processing
...@@ -94,20 +141,33 @@ namespace dlib ...@@ -94,20 +141,33 @@ namespace dlib
- #sending_node_id < number_of_nodes() - #sending_node_id < number_of_nodes()
- else - else
- There were no other messages to receive and all other processing - There were no other messages to receive and all other processing
nodes are blocked on calls to receive(). nodes are blocked on calls to receive() or have terminated. That is,
receive() waits for all other nodes to be in a state which can't
generate new messages before it returns false).
throws
- dlib::socket_error:
This exception is thrown if some error occurs which prevents us from
communicating with other processing nodes.
- dlib::serialization_error or any exception thrown by the global
deserialize(T) routine:
This is thrown if there is a problem in deserialize(). This might
happen if the message sent doesn't match the type T expected by
receive().
!*/ !*/
void receive ( void receive (
); );
/*! /*!
ensures ensures
- simply waits for all other nodes to become blocked - simply waits for all other nodes to become blocked on calls to receive()
on calls to receive() or to terminate (i.e. waits for or to terminate (i.e. waits for other nodes to be in a state that can't
other nodes to be in a state that can't send messages). send messages).
throws throws
- socket_error: - dlib::socket_error:
This exception is thrown if a message is received before this function This exception is thrown if some error occurs which prevents us from
would otherwise return. communicating with other processing nodes or if a message is received
before this function would otherwise return.
!*/ !*/
}; };
...@@ -122,6 +182,29 @@ namespace dlib ...@@ -122,6 +182,29 @@ namespace dlib
const std::vector<std::pair<std::string,unsigned short> >& hosts, const std::vector<std::pair<std::string,unsigned short> >& hosts,
funct_type funct funct_type funct
); );
/*!
requires
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT) must be a valid expression
(i.e. funct must be a function or function object)
ensures
- This function spawns a BSP job consisting of hosts.size()+1 processing nodes.
- The processing node with a node ID of 0 will run locally on the machine
calling bsp_connect(). In particular, this node will execute funct(CONTEXT),
which is expected to carry out this node's portion of the BSP computation.
- The other processing nodes are executed on the hosts indicated by the input
argument. In particular, this function interprets hosts as a list of IP
addresses and port numbers identifying machines running the bsp_listen() or
bsp_listen_dynamic_port() routines.
- This call to bsp_connect() blocks until the BSP computation has completed on
all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -134,6 +217,29 @@ namespace dlib ...@@ -134,6 +217,29 @@ namespace dlib
funct_type funct, funct_type funct,
ARG1 arg1 ARG1 arg1
); );
/*!
requires
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1) must be a valid expression
(i.e. funct must be a function or function object)
ensures
- This function spawns a BSP job consisting of hosts.size()+1 processing nodes.
- The processing node with a node ID of 0 will run locally on the machine
calling bsp_connect(). In particular, this node will execute funct(CONTEXT,arg1),
which is expected to carry out this node's portion of the BSP computation.
- The other processing nodes are executed on the hosts indicated by the input
argument. In particular, this function interprets hosts as a list of IP
addresses and port numbers identifying machines running the bsp_listen() or
bsp_listen_dynamic_port() routines.
- This call to bsp_connect() blocks until the BSP computation has completed on
all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -148,6 +254,29 @@ namespace dlib ...@@ -148,6 +254,29 @@ namespace dlib
ARG1 arg1, ARG1 arg1,
ARG2 arg2 ARG2 arg2
); );
/*!
requires
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1,arg2) must be a valid expression
(i.e. funct must be a function or function object)
ensures
- This function spawns a BSP job consisting of hosts.size()+1 processing nodes.
- The processing node with a node ID of 0 will run locally on the machine
calling bsp_connect(). In particular, this node will execute funct(CONTEXT,arg1,arg2),
which is expected to carry out this node's portion of the BSP computation.
- The other processing nodes are executed on the hosts indicated by the input
argument. In particular, this function interprets hosts as a list of IP
addresses and port numbers identifying machines running the bsp_listen() or
bsp_listen_dynamic_port() routines.
- This call to bsp_connect() blocks until the BSP computation has completed on
all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -164,6 +293,29 @@ namespace dlib ...@@ -164,6 +293,29 @@ namespace dlib
ARG2 arg2, ARG2 arg2,
ARG3 arg3 ARG3 arg3
); );
/*!
requires
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1,arg2,arg3) must be a valid expression
(i.e. funct must be a function or function object)
ensures
- This function spawns a BSP job consisting of hosts.size()+1 processing nodes.
- The processing node with a node ID of 0 will run locally on the machine
calling bsp_connect(). In particular, this node will execute funct(CONTEXT,arg1,arg2,arg3),
which is expected to carry out this node's portion of the BSP computation.
- The other processing nodes are executed on the hosts indicated by the input
argument. In particular, this function interprets hosts as a list of IP
addresses and port numbers identifying machines running the bsp_listen() or
bsp_listen_dynamic_port() routines.
- This call to bsp_connect() blocks until the BSP computation has completed on
all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -182,6 +334,29 @@ namespace dlib ...@@ -182,6 +334,29 @@ namespace dlib
ARG3 arg3, ARG3 arg3,
ARG4 arg4 ARG4 arg4
); );
/*!
requires
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1,arg2,arg3,arg4) must be a valid expression
(i.e. funct must be a function or function object)
ensures
- This function spawns a BSP job consisting of hosts.size()+1 processing nodes.
- The processing node with a node ID of 0 will run locally on the machine
calling bsp_connect(). In particular, this node will execute funct(CONTEXT,arg1,arg2,arg3,arg4),
which is expected to carry out this node's portion of the BSP computation.
- The other processing nodes are executed on the hosts indicated by the input
argument. In particular, this function interprets hosts as a list of IP
addresses and port numbers identifying machines running the bsp_listen() or
bsp_listen_dynamic_port() routines.
- This call to bsp_connect() blocks until the BSP computation has completed on
all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -193,6 +368,30 @@ namespace dlib ...@@ -193,6 +368,30 @@ namespace dlib
unsigned short listening_port, unsigned short listening_port,
funct_type funct funct_type funct
); );
/*!
requires
- listening_port != 0
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT) must be a valid expression
(i.e. funct must be a function or function object)
ensures
- This function listens for a connection from a bsp_connect() routine. Once
this connection is established, funct(CONTEXT) will be executed and it will
then be able to participate in the BSP computation as one of the processing
nodes.
- This function will listen on TCP port listening_port for a connection from
bsp_connect(). Once the connection is established, it will close the
listening port so it is free for use by other applications. The connection
and BSP computation will continue uninterrupted.
- This call to bsp_listen() blocks until the BSP computation has completed on
all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -205,6 +404,30 @@ namespace dlib ...@@ -205,6 +404,30 @@ namespace dlib
funct_type funct, funct_type funct,
ARG1 arg1 ARG1 arg1
); );
/*!
requires
- listening_port != 0
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1) must be a valid expression
(i.e. funct must be a function or function object)
ensures
- This function listens for a connection from a bsp_connect() routine. Once
this connection is established, funct(CONTEXT,arg1) will be executed and it will
then be able to participate in the BSP computation as one of the processing
nodes.
- This function will listen on TCP port listening_port for a connection from
bsp_connect(). Once the connection is established, it will close the
listening port so it is free for use by other applications. The connection
and BSP computation will continue uninterrupted.
- This call to bsp_listen() blocks until the BSP computation has completed on
all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -219,6 +442,30 @@ namespace dlib ...@@ -219,6 +442,30 @@ namespace dlib
ARG1 arg1, ARG1 arg1,
ARG2 arg2 ARG2 arg2
); );
/*!
requires
- listening_port != 0
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1,arg2) must be a valid expression
(i.e. funct must be a function or function object)
ensures
- This function listens for a connection from a bsp_connect() routine. Once
this connection is established, funct(CONTEXT,arg1,arg2) will be executed and
it will then be able to participate in the BSP computation as one of the
processing nodes.
- This function will listen on TCP port listening_port for a connection from
bsp_connect(). Once the connection is established, it will close the
listening port so it is free for use by other applications. The connection
and BSP computation will continue uninterrupted.
- This call to bsp_listen() blocks until the BSP computation has completed on
all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -235,6 +482,30 @@ namespace dlib ...@@ -235,6 +482,30 @@ namespace dlib
ARG2 arg2, ARG2 arg2,
ARG3 arg3 ARG3 arg3
); );
/*!
requires
- listening_port != 0
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1,arg2,arg3) must be a valid expression
(i.e. funct must be a function or function object)
ensures
- This function listens for a connection from a bsp_connect() routine. Once
this connection is established, funct(CONTEXT,arg1,arg2,arg3) will be
executed and it will then be able to participate in the BSP computation as
one of the processing nodes.
- This function will listen on TCP port listening_port for a connection from
bsp_connect(). Once the connection is established, it will close the
listening port so it is free for use by other applications. The connection
and BSP computation will continue uninterrupted.
- This call to bsp_listen() blocks until the BSP computation has completed on
all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -253,6 +524,30 @@ namespace dlib ...@@ -253,6 +524,30 @@ namespace dlib
ARG3 arg3, ARG3 arg3,
ARG4 arg4 ARG4 arg4
); );
/*!
requires
- listening_port != 0
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1,arg2,arg3,arg4) must be a valid expression
(i.e. funct must be a function or function object)
ensures
- This function listens for a connection from a bsp_connect() routine. Once
this connection is established, funct(CONTEXT,arg1,arg2,arg3,arg4) will be
executed and it will then be able to participate in the BSP computation as
one of the processing nodes.
- This function will listen on TCP port listening_port for a connection from
bsp_connect(). Once the connection is established, it will close the
listening port so it is free for use by other applications. The connection
and BSP computation will continue uninterrupted.
- This call to bsp_listen() blocks until the BSP computation has completed on
all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -266,6 +561,42 @@ namespace dlib ...@@ -266,6 +561,42 @@ namespace dlib
port_notify_function_type port_notify_function, port_notify_function_type port_notify_function,
funct_type funct funct_type funct
); );
/*!
requires
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT) must be a valid expression
(i.e. funct must be a function or function object)
- port_notify_function((unsigned short) 1234) must be a valid expression
(i.e. port_notify_function() must be a function or function object taking an
unsigned short)
ensures
- This function listens for a connection from a bsp_connect() routine. Once
this connection is established, funct(CONTEXT) will be executed and it will
then be able to participate in the BSP computation as one of the processing
nodes.
- if (listening_port != 0) then
- This function will listen on TCP port listening_port for a connection
from bsp_connect().
- else
- An available TCP port number is automatically selected and this function
will listen on it for a connection from bsp_connect().
- Once a listening port is opened, port_notify_function() is called with the
port number used. This provides a mechanism to find out what listening port
has been used if it is automatically selected. It also allows you to find
out when the routine has begun listening for an incoming connection from
bsp_connect().
- Once a connection is established, we will close the listening port so it is
free for use by other applications. The connection and BSP computation will
continue uninterrupted.
- This call to bsp_listen_dynamic_port() blocks until the BSP computation has
completed on all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -280,6 +611,42 @@ namespace dlib ...@@ -280,6 +611,42 @@ namespace dlib
funct_type funct, funct_type funct,
ARG1 arg1 ARG1 arg1
); );
/*!
requires
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1) must be a valid expression
(i.e. funct must be a function or function object)
- port_notify_function((unsigned short) 1234) must be a valid expression
(i.e. port_notify_function() must be a function or function object taking an
unsigned short)
ensures
- This function listens for a connection from a bsp_connect() routine. Once
this connection is established, funct(CONTEXT,arg1) will be executed and it
will then be able to participate in the BSP computation as one of the
processing nodes.
- if (listening_port != 0) then
- This function will listen on TCP port listening_port for a connection
from bsp_connect().
- else
- An available TCP port number is automatically selected and this function
will listen on it for a connection from bsp_connect().
- Once a listening port is opened, port_notify_function() is called with the
port number used. This provides a mechanism to find out what listening port
has been used if it is automatically selected. It also allows you to find
out when the routine has begun listening for an incoming connection from
bsp_connect().
- Once a connection is established, we will close the listening port so it is
free for use by other applications. The connection and BSP computation will
continue uninterrupted.
- This call to bsp_listen_dynamic_port() blocks until the BSP computation has
completed on all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -296,6 +663,42 @@ namespace dlib ...@@ -296,6 +663,42 @@ namespace dlib
ARG1 arg1, ARG1 arg1,
ARG2 arg2 ARG2 arg2
); );
/*!
requires
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1,arg2) must be a valid expression
(i.e. funct must be a function or function object)
- port_notify_function((unsigned short) 1234) must be a valid expression
(i.e. port_notify_function() must be a function or function object taking an
unsigned short)
ensures
- This function listens for a connection from a bsp_connect() routine. Once
this connection is established, funct(CONTEXT,arg1,arg2) will be executed and
it will then be able to participate in the BSP computation as one of the
processing nodes.
- if (listening_port != 0) then
- This function will listen on TCP port listening_port for a connection
from bsp_connect().
- else
- An available TCP port number is automatically selected and this function
will listen on it for a connection from bsp_connect().
- Once a listening port is opened, port_notify_function() is called with the
port number used. This provides a mechanism to find out what listening port
has been used if it is automatically selected. It also allows you to find
out when the routine has begun listening for an incoming connection from
bsp_connect().
- Once a connection is established, we will close the listening port so it is
free for use by other applications. The connection and BSP computation will
continue uninterrupted.
- This call to bsp_listen_dynamic_port() blocks until the BSP computation has
completed on all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -314,6 +717,42 @@ namespace dlib ...@@ -314,6 +717,42 @@ namespace dlib
ARG2 arg2, ARG2 arg2,
ARG3 arg3 ARG3 arg3
); );
/*!
requires
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1,arg2,arg3) must be a valid expression
(i.e. funct must be a function or function object)
- port_notify_function((unsigned short) 1234) must be a valid expression
(i.e. port_notify_function() must be a function or function object taking an
unsigned short)
ensures
- This function listens for a connection from a bsp_connect() routine. Once
this connection is established, funct(CONTEXT,arg1,arg2,arg3) will be
executed and it will then be able to participate in the BSP computation as
one of the processing nodes.
- if (listening_port != 0) then
- This function will listen on TCP port listening_port for a connection
from bsp_connect().
- else
- An available TCP port number is automatically selected and this function
will listen on it for a connection from bsp_connect().
- Once a listening port is opened, port_notify_function() is called with the
port number used. This provides a mechanism to find out what listening port
has been used if it is automatically selected. It also allows you to find
out when the routine has begun listening for an incoming connection from
bsp_connect().
- Once a connection is established, we will close the listening port so it is
free for use by other applications. The connection and BSP computation will
continue uninterrupted.
- This call to bsp_listen_dynamic_port() blocks until the BSP computation has
completed on all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
...@@ -334,6 +773,42 @@ namespace dlib ...@@ -334,6 +773,42 @@ namespace dlib
ARG3 arg3, ARG3 arg3,
ARG4 arg4 ARG4 arg4
); );
/*!
requires
- let CONTEXT be an instance of a bsp_context object. Then:
- funct(CONTEXT,arg1,arg2,arg3,arg4) must be a valid expression
(i.e. funct must be a function or function object)
- port_notify_function((unsigned short) 1234) must be a valid expression
(i.e. port_notify_function() must be a function or function object taking an
unsigned short)
ensures
- This function listens for a connection from a bsp_connect() routine. Once
this connection is established, funct(CONTEXT,arg1,arg2,arg3,arg4) will be
executed and it will then be able to participate in the BSP computation as
one of the processing nodes.
- if (listening_port != 0) then
- This function will listen on TCP port listening_port for a connection
from bsp_connect().
- else
- An available TCP port number is automatically selected and this function
will listen on it for a connection from bsp_connect().
- Once a listening port is opened, port_notify_function() is called with the
port number used. This provides a mechanism to find out what listening port
has been used if it is automatically selected. It also allows you to find
out when the routine has begun listening for an incoming connection from
bsp_connect().
- Once a connection is established, we will close the listening port so it is
free for use by other applications. The connection and BSP computation will
continue uninterrupted.
- This call to bsp_listen_dynamic_port() blocks until the BSP computation has
completed on all processing nodes.
throws
- dlib::socket_error
This exception is thrown if there is an error which prevents the BSP
job from executing.
- Any exception thrown by funct() will be propagated out of this call to
bsp_connect().
!*/
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
// ---------------------------------------------------------------------------------------- // ----------------------------------------------------------------------------------------
......
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