diff options
Diffstat (limited to 'lib/stdlib/doc/src/timer.xml')
| -rw-r--r-- | lib/stdlib/doc/src/timer.xml | 195 |
1 files changed, 95 insertions, 100 deletions
diff --git a/lib/stdlib/doc/src/timer.xml b/lib/stdlib/doc/src/timer.xml index 0b6807dd6c..0c1e398dc4 100644 --- a/lib/stdlib/doc/src/timer.xml +++ b/lib/stdlib/doc/src/timer.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> @@ -49,9 +49,19 @@ as requested. </p> </description> + <datatypes> + <datatype> + <name name="time"/> + <desc><p>Time in milliseconds.</p></desc> + </datatype> + <datatype> + <name name="tref"/> + <desc><p>A timer reference.</p></desc> + </datatype> + </datatypes> <funcs> <func> - <name>start() -> ok</name> + <name name="start" arity="0"/> <fsummary>Start a global timer server (named <c>timer_server</c>).</fsummary> <desc> <p>Starts the timer server. Normally, the server does not need @@ -62,199 +72,185 @@ </desc> </func> <func> - <name>apply_after(Time, Module, Function, Arguments) -> {ok, Tref} | {error, Reason}</name> + <name name="apply_after" arity="4"/> <fsummary>Apply <c>Module:Function(Arguments)</c>after a specified <c>Time</c>.</fsummary> - <type> - <v>Time = integer() in Milliseconds</v> - <v>Module = Function = atom()</v> - <v>Arguments = [term()]</v> - </type> <desc> - <p>Evaluates <c>apply(M, F, A)</c> after <c>Time</c> amount of time - has elapsed. Returns <c>{ok, TRef}</c>, or <c>{error, Reason}</c>.</p> + <p>Evaluates <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Arguments</anno>)</c> after <c><anno>Time</anno></c> amount of time + has elapsed. Returns <c>{ok, <anno>TRef</anno>}</c>, or <c>{error, <anno>Reason</anno>}</c>.</p> </desc> </func> <func> - <name>send_after(Time, Pid, Message) -> {ok, TRef} | {error,Reason}</name> - <name>send_after(Time, Message) -> {ok, TRef} | {error,Reason}</name> + <name name="send_after" arity="2"/> + <name name="send_after" arity="3"/> <fsummary>Send <c>Message</c>to <c>Pid</c>after a specified <c>Time</c>.</fsummary> - <type> - <v>Time = integer() in Milliseconds</v> - <v>Pid = pid() | atom()</v> - <v>Message = term()</v> - <v>Result = {ok, TRef} | {error, Reason}</v> - </type> <desc> - <p></p> + <p> <taglist> <tag><c>send_after/3</c></tag> <item> - <p>Evaluates <c>Pid ! Message</c> after <c>Time</c> amount - of time has elapsed. (<c>Pid</c> can also be an atom of a - registered name.) Returns <c>{ok, TRef}</c>, or - <c>{error, Reason}</c>.</p> + <p>Evaluates <c><anno>Pid</anno> ! <anno>Message</anno></c> after <c><anno>Time</anno></c> amount + of time has elapsed. (<c><anno>Pid</anno></c> can also be an atom of a + registered name.) Returns <c>{ok, <anno>TRef</anno>}</c>, or + <c>{error, <anno>Reason</anno>}</c>.</p> </item> <tag><c>send_after/2</c></tag> <item> - <p>Same as <c>send_after(Time, self(), Message)</c>.</p> + <p>Same as <c>send_after(<anno>Time</anno>, self(), <anno>Message</anno>)</c>.</p> </item> </taglist> + </p> </desc> </func> <func> - <name>exit_after(Time, Pid, Reason1) -> {ok, TRef} | {error,Reason2}</name> - <name>exit_after(Time, Reason1) -> {ok, TRef} | {error,Reason2}</name> - <name>kill_after(Time, Pid)-> {ok, TRef} | {error,Reason2}</name> - <name>kill_after(Time) -> {ok, TRef} | {error,Reason2}</name> + <name name="kill_after" arity="1"/> + <name name="kill_after" arity="2"/> + <name name="exit_after" arity="2"/> + <name name="exit_after" arity="3"/> <fsummary>Send an exit signal with <c>Reason</c>after a specified <c>Time</c>.</fsummary> - <type> - <v>Time = integer() in milliseconds</v> - <v>Pid = pid() | atom()</v> - <v>Reason1 = Reason2 = term()</v> - </type> <desc> - <p></p> + <p> <taglist> <tag><c>exit_after/3</c></tag> <item> - <p>Send an exit signal with reason <c>Reason1</c> to Pid - <c>Pid</c>. Returns <c>{ok, TRef}</c>, or - <c>{error, Reason2}</c>.</p> + <p>Send an exit signal with reason <c><anno>Reason1</anno></c> to Pid + <c><anno>Pid</anno></c>. Returns <c>{ok, <anno>TRef</anno>}</c>, or + <c>{error, <anno>Reason2</anno>}</c>.</p> </item> <tag><c>exit_after/2</c></tag> <item> - <p>Same as <c>exit_after(Time, self(), Reason1)</c>. </p> + <p>Same as <c>exit_after(<anno>Time</anno>, self(), <anno>Reason1</anno>)</c>. </p> </item> <tag><c>kill_after/2</c></tag> <item> - <p>Same as <c>exit_after(Time, Pid, kill)</c>. </p> + <p>Same as <c>exit_after(<anno>Time</anno>, <anno>Pid</anno>, kill)</c>. </p> </item> <tag><c>kill_after/1</c></tag> <item> - <p>Same as <c>exit_after(Time, self(), kill)</c>. </p> + <p>Same as <c>exit_after(<anno>Time</anno>, self(), kill)</c>. </p> </item> </taglist> + </p> </desc> </func> <func> - <name>apply_interval(Time, Module, Function, Arguments) -> {ok, TRef} | {error, Reason}</name> + <name name="apply_interval" arity="4"/> <fsummary>Evaluate <c>Module:Function(Arguments)</c>repeatedly at intervals of <c>Time</c>.</fsummary> - <type> - <v>Time = integer() in milliseconds</v> - <v>Module = Function = atom()</v> - <v>Arguments = [term()]</v> - </type> <desc> - <p>Evaluates <c>apply(Module, Function, Arguments)</c> repeatedly at - intervals of <c>Time</c>. Returns <c>{ok, TRef}</c>, or - <c>{error, Reason}</c>.</p> + <p>Evaluates <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Arguments</anno>)</c> repeatedly at + intervals of <c><anno>Time</anno></c>. Returns <c>{ok, <anno>TRef</anno>}</c>, or + <c>{error, <anno>Reason</anno>}</c>.</p> </desc> </func> <func> - <name>send_interval(Time, Pid, Message) -> {ok, TRef} | {error, Reason}</name> - <name>send_interval(Time, Message) -> {ok, TRef} | {error, Reason}</name> + <name name="send_interval" arity="2"/> + <name name="send_interval" arity="3"/> <fsummary>Send <c>Message</c>repeatedly at intervals of <c>Time</c>.</fsummary> - <type> - <v>Time = integer() in milliseconds</v> - <v>Pid = pid() | atom()</v> - <v>Message = term()</v> - <v>Reason = term()</v> - </type> <desc> - <p></p> + <p> <taglist> <tag><c>send_interval/3</c></tag> <item> - <p>Evaluates <c>Pid ! Message</c> repeatedly after <c>Time</c> - amount of time has elapsed. (<c>Pid</c> can also be an atom of - a registered name.) Returns <c>{ok, TRef}</c> or - <c>{error, Reason}</c>.</p> + <p>Evaluates <c><anno>Pid</anno> ! <anno>Message</anno></c> repeatedly after <c><anno>Time</anno></c> + amount of time has elapsed. (<c><anno>Pid</anno></c> can also be an atom of + a registered name.) Returns <c>{ok, <anno>TRef</anno>}</c> or + <c>{error, <anno>Reason</anno>}</c>.</p> </item> <tag><c>send_interval/2</c></tag> <item> - <p>Same as <c>send_interval(Time, self(), Message)</c>.</p> + <p>Same as <c>send_interval(<anno>Time</anno>, self(), <anno>Message</anno>)</c>.</p> </item> </taglist> + </p> </desc> </func> <func> - <name>cancel(TRef) -> {ok, cancel} | {error, Reason}</name> + <name name="cancel" arity="1"/> <fsummary>Cancel a previously requested timeout identified by <c>TRef</c>.</fsummary> <desc> - <p>Cancels a previously requested timeout. <c>TRef</c> is a unique + <p>Cancels a previously requested timeout. <c><anno>TRef</anno></c> is a unique timer reference returned by the timer function in question. Returns - <c>{ok, cancel}</c>, or <c>{error, Reason}</c> when <c>TRef</c> + <c>{ok, cancel}</c>, or <c>{error, <anno>Reason</anno>}</c> when <c><anno>TRef</anno></c> is not a timer reference.</p> </desc> </func> <func> - <name>sleep(Time) -> ok</name> + <name name="sleep" arity="1"/> <fsummary>Suspend the calling process for <c>Time</c>amount of milliseconds.</fsummary> - <type> - <v>Time = integer() in milliseconds or the atom infinity</v> - </type> <desc> - <p>Suspends the process calling this function for <c>Time</c> amount + <p>Suspends the process calling this function for <c><anno>Time</anno></c> amount of milliseconds and then returns <c>ok</c>, or suspend the process - forever if <c>Time</c> is the atom <c>infinity</c>. Naturally, this + forever if <c><anno>Time</anno></c> is the atom <c>infinity</c>. Naturally, this function does <em>not</em> return immediately.</p> </desc> </func> <func> - <name>tc(Module, Function, Arguments) -> {Time, Value}</name> - <fsummary>Measure the real time it takes to evaluate <c>apply(Module, Function, Arguments)</c></fsummary> - <type> - <v>Module = Function = atom()</v> - <v>Arguments = [term()]</v> - <v>Time = integer() in microseconds</v> - <v>Value = term()</v> - </type> + <name name="tc" arity="1"/> + <name name="tc" arity="2"/> + <name name="tc" arity="3"/> + <fsummary>Measure the real time it takes to evaluate <c>apply(Module, + Function, Arguments)</c> or <c>apply(Fun, Arguments)</c></fsummary> + <type_desc variable="Time">In microseconds</type_desc> <desc> - <p>Evaluates <c>apply(Module, Function, Arguments)</c> and measures - the elapsed real time. Returns <c>{Time, Value}</c>, where - <c>Time</c> is the elapsed real time in <em>microseconds</em>, - and <c>Value</c> is what is returned from the apply.</p> + <p> + <taglist> + <tag><c>tc/3</c></tag> + <item> + <p>Evaluates <c>apply(<anno>Module</anno>, <anno>Function</anno>, <anno>Arguments</anno>)</c> and measures + the elapsed real time as reported by <c>os:timestamp/0</c>. + Returns <c>{<anno>Time</anno>, <anno>Value</anno>}</c>, where + <c><anno>Time</anno></c> is the elapsed real time in <em>microseconds</em>, + and <c><anno>Value</anno></c> is what is returned from the apply.</p> + </item> + <tag><c>tc/2</c></tag> + <item> + <p>Evaluates <c>apply(<anno>Fun</anno>, <anno>Arguments</anno>)</c>. Otherwise works + like <c>tc/3</c>.</p> + </item> + <tag><c>tc/1</c></tag> + <item> + <p>Evaluates <c><anno>Fun</anno>()</c>. Otherwise works like <c>tc/2</c>.</p> + </item> + + </taglist> + </p> </desc> </func> <func> - <name>now_diff(T2, T1) -> Tdiff</name> + <name name="now_diff" arity="2"/> <fsummary>Calculate time difference between <c>now/0</c>timestamps</fsummary> - <type> - <v>T1 = T2 = {MegaSecs, Secs, MicroSecs}</v> - <v>Tdiff = MegaSecs = Secs = MicroSecs = integer()</v> - </type> + <type_desc variable="Tdiff">In microseconds</type_desc> <desc> - <p>Calculates the time difference <c>Tdiff = T2 - T1</c> in - <em>microseconds</em>, where <c>T1</c> and <c>T2</c> probably + <p>Calculates the time difference <c><anno>Tdiff</anno> = <anno>T2</anno> - <anno>T1</anno></c> in + <em>microseconds</em>, where <c><anno>T1</anno></c> and <c><anno>T2</anno></c> probably are timestamp tuples returned from <c>erlang:now/0</c>.</p> </desc> </func> <func> - <name>seconds(Seconds) -> Milliseconds</name> + <name name="seconds" arity="1"/> <fsummary>Convert <c>Seconds</c>to <c>Milliseconds</c>.</fsummary> <desc> - <p>Returns the number of milliseconds in <c>Seconds</c>.</p> + <p>Returns the number of milliseconds in <c><anno>Seconds</anno></c>.</p> </desc> </func> <func> - <name>minutes(Minutes) -> Milliseconds</name> + <name name="minutes" arity="1"/> <fsummary>Converts <c>Minutes</c>to <c>Milliseconds</c>.</fsummary> <desc> - <p>Return the number of milliseconds in <c>Minutes</c>.</p> + <p>Return the number of milliseconds in <c><anno>Minutes</anno></c>.</p> </desc> </func> <func> - <name>hours(Hours) -> Milliseconds</name> + <name name="hours" arity="1"/> <fsummary>Convert <c>Hours</c>to <c>Milliseconds</c>.</fsummary> <desc> - <p>Returns the number of milliseconds in <c>Hours</c>.</p> + <p>Returns the number of milliseconds in <c><anno>Hours</anno></c>.</p> </desc> </func> <func> - <name>hms(Hours, Minutes, Seconds) -> Milliseconds</name> + <name name="hms" arity="3"/> <fsummary>Convert <c>Hours</c>+<c>Minutes</c>+<c>Seconds</c>to <c>Milliseconds</c>.</fsummary> <desc> - <p>Returns the number of milliseconds in <c>Hours + Minutes + Seconds</c>.</p> + <p>Returns the number of milliseconds in <c><anno>Hours</anno> + <anno>Minutes</anno> + <anno>Seconds</anno></c>.</p> </desc> </func> </funcs> @@ -262,7 +258,6 @@ <section> <title>Examples</title> <p>This example illustrates how to print out "Hello World!" in 5 seconds:</p> - <p></p> <pre> 1> <input>timer:apply_after(5000, io, format, ["~nHello World!~n", []]).</input> {ok,TRef} |