diff options
Diffstat (limited to 'lib/kernel/doc/src/rpc.xml')
| -rw-r--r-- | lib/kernel/doc/src/rpc.xml | 330 |
1 files changed, 92 insertions, 238 deletions
diff --git a/lib/kernel/doc/src/rpc.xml b/lib/kernel/doc/src/rpc.xml index 86c6ea9178..b01ff16c85 100644 --- a/lib/kernel/doc/src/rpc.xml +++ b/lib/kernel/doc/src/rpc.xml @@ -4,7 +4,7 @@ <erlref> <header> <copyright> - <year>1996</year><year>2009</year> + <year>1996</year><year>2011</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -37,40 +37,34 @@ for collecting information on a remote node, or for running a function with some specific side effects on the remote node.</p> </description> + <datatypes> + <datatype> + <name name="key"/> + <desc> + <p>As returned by <seealso marker="#async_call/4"> + <c>async_call/4</c>.</seealso></p> + </desc> + </datatype> + </datatypes> <funcs> <func> - <name>call(Node, Module, Function, Args) -> Res | {badrpc, Reason}</name> + <name name="call" arity="4"/> <fsummary>Evaluate a function call on a node</fsummary> - <type> - <v>Node = node()</v> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - <v>Res = term()</v> - <v>Reason = term()</v> - </type> <desc> - <p>Evaluates <c>apply(Module, Function, Args)</c> on the node - <c>Node</c> and returns the corresponding value <c>Res</c>, or - <c>{badrpc, Reason}</c> if the call fails.</p> + <p>Evaluates <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>)</c> on the node + <c><anno>Node</anno></c> and returns the corresponding value <c><anno>Res</anno></c>, or + <c>{badrpc, <anno>Reason</anno>}</c> if the call fails.</p> </desc> </func> <func> - <name>call(Node, Module, Function, Args, Timeout) -> Res | {badrpc, Reason}</name> + <name name="call" arity="5"/> <fsummary>Evaluate a function call on a node</fsummary> - <type> - <v>Node = node()</v> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - <v>Res = term()</v> - <v>Reason = timeout | term()</v> - <v>Timeout = int() | infinity</v> - </type> <desc> - <p>Evaluates <c>apply(Module, Function, Args)</c> on the node - <c>Node</c> and returns the corresponding value <c>Res</c>, or - <c>{badrpc, Reason}</c> if the call fails. <c>Timeout</c> is + <p>Evaluates <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>)</c> on the node + <c><anno>Node</anno></c> and returns the corresponding value <c><anno>Res</anno></c>, or + <c>{badrpc, <anno>Reason</anno>}</c> if the call fails. <c><anno>Timeout</anno></c> is a timeout value in milliseconds. If the call times out, - <c>Reason</c> is <c>timeout</c>.</p> + <c><anno>Reason</anno></c> is <c>timeout</c>.</p> <p>If the reply arrives after the call times out, no message will contaminate the caller's message queue, since this function spawns off a middleman process to act as (a void) @@ -80,17 +74,10 @@ </desc> </func> <func> - <name>block_call(Node, Module, Function, Args) -> Res | {badrpc, Reason}</name> + <name name="block_call" arity="4"/> <fsummary>Evaluate a function call on a node in the RPC server's context</fsummary> - <type> - <v>Node = node()</v> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - <v>Res = term()</v> - <v>Reason = term()</v> - </type> <desc> - <p>Like <c>call/4</c>, but the RPC server at <c>Node</c> does + <p>Like <c>call/4</c>, but the RPC server at <c><anno>Node</anno></c> does not create a separate process to handle the call. Thus, this function can be used if the intention of the call is to block the RPC server from any other incoming requests until @@ -101,50 +88,31 @@ </desc> </func> <func> - <name>block_call(Node, Module, Function, Args, Timeout) -> Res | {badrpc, Reason}</name> + <name name="block_call" arity="5"/> <fsummary>Evaluate a function call on a node in the RPC server's context</fsummary> - <type> - <v>Node = node()</v> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - <v>Timeout = int() | infinity</v> - <v>Res = term()</v> - <v>Reason = term()</v> - </type> <desc> <p>Like <c>block_call/4</c>, but with a timeout value in the same manner as <c>call/5</c>.</p> </desc> </func> <func> - <name>async_call(Node, Module, Function, Args) -> Key</name> + <name name="async_call" arity="4"/> <fsummary>Evaluate a function call on a node, asynchronous version</fsummary> - <type> - <v>Node = node()</v> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - <v>Key -- see below</v> - </type> <desc> <p>Implements <em>call streams with promises</em>, a type of RPC which does not suspend the caller until the result is finished. Instead, a key is returned which can be used at a later stage to collect the value. The key can be viewed as a promise to deliver the answer.</p> - <p>In this case, the key <c>Key</c> is returned, which can be + <p>In this case, the key <c><anno>Key</anno></c> is returned, which can be used in a subsequent call to <c>yield/1</c> or <c>nb_yield/1,2</c> to retrieve the value of evaluating - <c>apply(Module, Function, Args)</c> on the node <c>Node</c>.</p> + <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>)</c> on the node <c><anno>Node</anno></c>.</p> </desc> </func> <func> - <name>yield(Key) -> Res | {badrpc, Reason}</name> + <name name="yield" arity="1"/> <fsummary>Deliver the result of evaluating a function call on a node (blocking)</fsummary> - <type> - <v>Key -- see async_call/4</v> - <v>Res = term()</v> - <v>Reason = term()</v> - </type> <desc> <p>Returns the promised answer from a previous <c>async_call/4</c>. If the answer is available, it is @@ -153,87 +121,46 @@ </desc> </func> <func> - <name>nb_yield(Key) -> {value, Val} | timeout</name> + <name name="nb_yield" arity="1"/> <fsummary>Deliver the result of evaluating a function call on a node (non-blocking)</fsummary> - <type> - <v>Key -- see async_call/4</v> - <v>Val = Res | {badrpc, Reason}</v> - <v> Res = term()</v> - <v> Reason = term()</v> - </type> <desc> - <p>Equivalent to <c>nb_yield(Key, 0)</c>.</p> + <p>Equivalent to <c>nb_yield(<anno>Key</anno>, 0)</c>.</p> </desc> </func> <func> - <name>nb_yield(Key, Timeout) -> {value, Val} | timeout</name> + <name name="nb_yield" arity="2"/> <fsummary>Deliver the result of evaluating a function call on a node (non-blocking)</fsummary> - <type> - <v>Key -- see async_call/4</v> - <v>Timeout = int() | infinity</v> - <v>Val = Res | {badrpc, Reason}</v> - <v> Res = term()</v> - <v> Reason = term()</v> - </type> <desc> <p>This is a non-blocking version of <c>yield/1</c>. It returns - the tuple <c>{value, Val}</c> when the computation has - finished, or <c>timeout</c> when <c>Timeout</c> milliseconds + the tuple <c>{value, <anno>Val</anno>}</c> when the computation has + finished, or <c>timeout</c> when <c><anno>Timeout</anno></c> milliseconds has elapsed.</p> </desc> </func> <func> - <name>multicall(Module, Function, Args) -> {ResL, BadNodes}</name> + <name name="multicall" arity="3"/> <fsummary>Evaluate a function call on a number of nodes</fsummary> - <type> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - <v>ResL = [term()]</v> - <v>BadNodes = [node()]</v> - </type> <desc> - <p>Equivalent to <c>multicall([node()|nodes()], Module, Function, Args, infinity)</c>.</p> + <p>Equivalent to <c>multicall([node()|nodes()], <anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>, infinity)</c>.</p> </desc> </func> <func> - <name>multicall(Nodes, Module, Function, Args) -> {ResL, BadNodes}</name> + <name name="multicall" arity="4" clause_i="1"/> <fsummary>Evaluate a function call on a number of nodes</fsummary> - <type> - <v>Nodes = [node()]</v> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - <v>ResL = [term()]</v> - <v>BadNodes = [node()]</v> - </type> <desc> - <p>Equivalent to <c>multicall(Nodes, Module, Function, Args, infinity)</c>.</p> + <p>Equivalent to <c>multicall(<anno>Nodes</anno>, <anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>, infinity)</c>.</p> </desc> </func> <func> - <name>multicall(Module, Function, Args, Timeout) -> {ResL, BadNodes}</name> + <name name="multicall" arity="4" clause_i="2"/> <fsummary>Evaluate a function call on a number of nodes</fsummary> - <type> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - <v>Timeout = int() | infinity</v> - <v>ResL = [term()]</v> - <v>BadNodes = [node()]</v> - </type> <desc> - <p>Equivalent to <c>multicall([node()|nodes()], Module, Function, Args, Timeout)</c>.</p> + <p>Equivalent to <c>multicall([node()|nodes()], <anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>, <anno>Timeout</anno>)</c>.</p> </desc> </func> <func> - <name>multicall(Nodes, Module, Function, Args, Timeout) -> {ResL, BadNodes}</name> + <name name="multicall" arity="5"/> <fsummary>Evaluate a function call on a number of nodes</fsummary> - <type> - <v>Nodes = [node()]</v> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - <v>Timeout = int() | infinity</v> - <v>ResL = [term()]</v> - <v>BadNodes = [node()]</v> - </type> <desc> <p>In contrast to an RPC, a multicall is an RPC which is sent concurrently from one client to multiple servers. This is @@ -243,12 +170,12 @@ making a series of RPCs on all the nodes, but the multicall is faster as all the requests are sent at the same time and are collected one by one as they come back.</p> - <p>The function evaluates <c>apply(Module, Function, Args)</c> + <p>The function evaluates <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>)</c> on the specified nodes and collects the answers. It returns - <c>{ResL, Badnodes}</c>, where <c>Badnodes</c> is a list + <c>{<anno>ResL</anno>, <anno>BadNodes</anno>}</c>, where <c><anno>BadNodes</anno></c> is a list of the nodes that terminated or timed out during computation, - and <c>ResL</c> is a list of the return values. - <c>Timeout</c> is a time (integer) in milliseconds, or + and <c><anno>ResL</anno></c> is a list of the return values. + <c><anno>Timeout</anno></c> is a time (integer) in milliseconds, or <c>infinity</c>.</p> <p>The following example is useful when new object code is to be loaded on all nodes in the network, and also indicates @@ -264,93 +191,60 @@ </desc> </func> <func> - <name>cast(Node, Module, Function, Args) -> void()</name> + <name name="cast" arity="4"/> <fsummary>Run a function on a node ignoring the result</fsummary> - <type> - <v>Node = node()</v> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - </type> <desc> - <p>Evaluates <c>apply(Module, Function, Args)</c> on the node - <c>Node</c>. No response is delivered and the calling + <p>Evaluates <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>)</c> on the node + <c><anno>Node</anno></c>. No response is delivered and the calling process is not suspended until the evaluation is complete, as is the case with <c>call/4,5</c>.</p> </desc> </func> <func> - <name>eval_everywhere(Module, Funtion, Args) -> void()</name> + <name name="eval_everywhere" arity="3"/> <fsummary>Run a function on all nodes, ignoring the result</fsummary> - <type> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - </type> <desc> - <p>Equivalent to <c>eval_everywhere([node()|nodes()], Module, Function, Args)</c>.</p> + <p>Equivalent to <c>eval_everywhere([node()|nodes()], <anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>)</c>.</p> </desc> </func> <func> - <name>eval_everywhere(Nodes, Module, Function, Args) -> void()</name> + <name name="eval_everywhere" arity="4"/> <fsummary>Run a function on specific nodes, ignoring the result</fsummary> - <type> - <v>Nodes = [node()]</v> - <v>Module = Function = atom()</v> - <v>Args = [term()]</v> - </type> <desc> - <p>Evaluates <c>apply(Module, Function, Args)</c> on + <p>Evaluates <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>)</c> on the specified nodes. No answers are collected.</p> </desc> </func> <func> - <name>abcast(Name, Msg) -> void()</name> + <name name="abcast" arity="2"/> <fsummary>Broadcast a message asynchronously to a registered process on all nodes</fsummary> - <type> - <v>Name = atom()</v> - <v>Msg = term()</v> - </type> <desc> - <p>Equivalent to <c>abcast([node()|nodes()], Name, Msg)</c>.</p> + <p>Equivalent to <c>abcast([node()|nodes()], <anno>Name</anno>, <anno>Msg</anno>)</c>.</p> </desc> </func> <func> - <name>abcast(Nodes, Name, Msg) -> void()</name> + <name name="abcast" arity="3"/> <fsummary>Broadcast a message asynchronously to a registered process on specific nodes</fsummary> - <type> - <v>Nodes = [node()]</v> - <v>Name = atom()</v> - <v>Msg = term()</v> - </type> <desc> - <p>Broadcasts the message <c>Msg</c> asynchronously to - the registered process <c>Name</c> on the specified nodes.</p> + <p>Broadcasts the message <c><anno>Msg</anno></c> asynchronously to + the registered process <c><anno>Name</anno></c> on the specified nodes.</p> </desc> </func> <func> - <name>sbcast(Name, Msg) -> {GoodNodes, BadNodes}</name> + <name name="sbcast" arity="2"/> <fsummary>Broadcast a message synchronously to a registered process on all nodes</fsummary> - <type> - <v>Name = atom()</v> - <v>Msg = term()</v> - <v>GoodNodes = BadNodes = [node()]</v> - </type> <desc> - <p>Equivalent to <c>sbcast([node()|nodes()], Name, Msg)</c>.</p> + <p>Equivalent to <c>sbcast([node()|nodes()], <anno>Name</anno>, <anno>Msg</anno>)</c>.</p> </desc> </func> <func> - <name>sbcast(Nodes, Name, Msg) -> {GoodNodes, BadNodes}</name> + <name name="sbcast" arity="3"/> <fsummary>Broadcast a message synchronously to a registered process on specific nodes</fsummary> - <type> - <v>Name = atom()</v> - <v>Msg = term()</v> - <v>Nodes = GoodNodes = BadNodes = [node()]</v> - </type> <desc> - <p>Broadcasts the message <c>Msg</c> synchronously to - the registered process <c>Name</c> on the specified nodes.</p> - <p>Returns <c>{GoodNodes, BadNodes}</c>, where <c>GoodNodes</c> - is the list of nodes which have <c>Name</c> as a registered + <p>Broadcasts the message <c><anno>Msg</anno></c> synchronously to + the registered process <c><anno>Name</anno></c> on the specified nodes.</p> + <p>Returns <c>{<anno>GoodNodes</anno>, <anno>BadNodes</anno>}</c>, where <c><anno>GoodNodes</anno></c> + is the list of nodes which have <c><anno>Name</anno></c> as a registered process.</p> <p>The function is synchronous in the sense that it is known that all servers have received the message when the call @@ -362,67 +256,46 @@ </desc> </func> <func> - <name>server_call(Node, Name, ReplyWrapper, Msg) -> Reply | {error, Reason}</name> + <name name="server_call" arity="4"/> <fsummary>Interact with a server on a node</fsummary> - <type> - <v>Node = node()</v> - <v>Name = atom()</v> - <v>ReplyWrapper = Msg = Reply = term()</v> - <v>Reason = term()</v> - </type> <desc> <p>This function can be used when interacting with a server - called <c>Name</c> at node <c>Node</c>. It is assumed that + called <c><anno>Name</anno></c> at node <c><anno>Node</anno></c>. It is assumed that the server receives messages in the format - <c>{From, Msg}</c> and replies using <c>From ! {ReplyWrapper, Node, Reply}</c>. This function makes such + <c>{From, <anno>Msg</anno>}</c> and replies using <c>From ! {<anno>ReplyWrapper</anno>, <anno>Node</anno>, <anno>Reply</anno>}</c>. This function makes such a server call and ensures that the entire call is packed into an atomic transaction which either succeeds or fails. It never hangs, unless the server itself hangs.</p> - <p>The function returns the answer <c>Reply</c> as produced by - the server <c>Name</c>, or <c>{error, Reason}</c>.</p> + <p>The function returns the answer <c><anno>Reply</anno></c> as produced by + the server <c><anno>Name</anno></c>, or <c>{error, <anno>Reason</anno>}</c>.</p> </desc> </func> <func> - <name>multi_server_call(Name, Msg) -> {Replies, BadNodes}</name> + <name name="multi_server_call" arity="2"/> <fsummary>Interact with the servers on a number of nodes</fsummary> - <type> - <v>Name = atom()</v> - <v>Msg = term()</v> - <v>Replies = [Reply]</v> - <v> Reply = term()</v> - <v>BadNodes = [node()]</v> - </type> <desc> - <p>Equivalent to <c>multi_server_call([node()|nodes()], Name, Msg)</c>.</p> + <p>Equivalent to <c>multi_server_call([node()|nodes()], <anno>Name</anno>, <anno>Msg</anno>)</c>.</p> </desc> </func> <func> - <name>multi_server_call(Nodes, Name, Msg) -> {Replies, BadNodes}</name> + <name name="multi_server_call" arity="3"/> <fsummary>Interact with the servers on a number of nodes</fsummary> - <type> - <v>Nodes = [node()]</v> - <v>Name = atom()</v> - <v>Msg = term()</v> - <v>Replies = [Reply]</v> - <v> Reply = term()</v> - <v>BadNodes = [node()]</v> - </type> <desc> <p>This function can be used when interacting with servers - called <c>Name</c> on the specified nodes. It is assumed that - the servers receive messages in the format <c>{From, Msg}</c> - and reply using <c>From ! {Name, Node, Reply}</c>, where + called <c><anno>Name</anno></c> on the specified nodes. It is assumed that + the servers receive messages in the format <c>{From, <anno>Msg</anno>}</c> + and reply using <c>From ! {<anno>Name</anno>, Node, <anno>Reply</anno>}</c>, where <c>Node</c> is the name of the node where the server is - located. The function returns <c>{Replies, Badnodes}</c>, - where <c>Replies</c> is a list of all <c>Reply</c> values and - <c>BadNodes</c> is a list of the nodes which did not exist, or + located. The function returns <c>{<anno>Replies</anno>, <anno>BadNodes</anno>}</c>, + where <c><anno>Replies</anno></c> is a list of all <c><anno>Reply</anno></c> values and + <c><anno>BadNodes</anno></c> is a list of the nodes which did not exist, or where the server did not exist, or where the server terminated before sending any reply.</p> </desc> </func> <func> - <name>safe_multi_server_call(Name, Msg) -> {Replies, BadNodes}</name> - <name>safe_multi_server_call(Nodes, Name, Msg) -> {Replies, BadNodes}</name> + <name name="safe_multi_server_call" arity="2"/> + <name name="safe_multi_server_call" arity="3"/> <fsummary>Interact with the servers on a number of nodes (deprecated)</fsummary> <desc> <warning> @@ -432,66 +305,47 @@ <p>In Erlang/OTP R6B and earlier releases, <c>multi_server_call/2,3</c> could not handle the case where the remote node exists, but there is no server called - <c>Name</c>. Instead this function had to be used. In + <c><anno>Name</anno></c>. Instead this function had to be used. In Erlang/OTP R7B and later releases, however, the functions are equivalent, except for this function being slightly slower.</p> </desc> </func> <func> - <name>parallel_eval(FuncCalls) -> ResL</name> + <name name="parallel_eval" arity="1"/> <fsummary>Evaluate several function calls on all nodes in parallel</fsummary> - <type> - <v>FuncCalls = [{Module, Function, Args}]</v> - <v> Module = Function = atom()</v> - <v> Args = [term()]</v> - <v>ResL = [term()]</v> - </type> <desc> - <p>For every tuple in <c>FuncCalls</c>, evaluates - <c>apply(Module, Function, Args)</c> on some node in + <p>For every tuple in <c><anno>FuncCalls</anno></c>, evaluates + <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Args</anno>)</c> on some node in the network. Returns the list of return values, in the same - order as in <c>FuncCalls</c>.</p> + order as in <c><anno>FuncCalls</anno></c>.</p> </desc> </func> <func> - <name>pmap({Module, Function}, ExtraArgs, List2) -> List1</name> + <name name="pmap" arity="3"/> <fsummary>Parallell evaluation of mapping a function over a list </fsummary> - <type> - <v>Module = Function = atom()</v> - <v>ExtraArgs = [term()]</v> - <v>List1 = [Elem]</v> - <v> Elem = term()</v> - <v>List2 = [term()]</v> - </type> <desc> - <p>Evaluates <c>apply(Module, Function, [Elem|ExtraArgs])</c>, - for every element <c>Elem</c> in <c>List1</c>, in parallel. + <p>Evaluates <c>apply(<anno>Module</anno>, <anno>Function</anno>, [<anno>Elem</anno>|<anno>ExtraArgs</anno>])</c>, + for every element <c><anno>Elem</anno></c> in <c><anno>List1</anno></c>, in parallel. Returns the list of return values, in the same order as in - <c>List1</c>.</p> + <c><anno>List1</anno></c>.</p> </desc> </func> <func> - <name>pinfo(Pid) -> [{Item, Info}] | undefined</name> + <name name="pinfo" arity="1"/> <fsummary>Information about a process</fsummary> - <type> - <v>Pid = pid()</v> - <v>Item, Info -- see erlang:process_info/1</v> - </type> <desc> <p>Location transparent version of the BIF - <c>process_info/1</c>.</p> + <seealso marker="erts:erlang#process_info/1"> + <c>process_info/1</c></seealso>.</p> </desc> </func> <func> - <name>pinfo(Pid, Item) -> {Item, Info} | undefined | []</name> + <name name="pinfo" arity="2"/> <fsummary>Information about a process</fsummary> - <type> - <v>Pid = pid()</v> - <v>Item, Info -- see erlang:process_info/1</v> - </type> <desc> <p>Location transparent version of the BIF - <c>process_info/2</c>.</p> + <seealso marker="erts:erlang#process_info/2"> + <c>process_info/2</c></seealso>.</p> </desc> </func> </funcs> |