.NET/Java PDF, Tiff, Barcode SDK Library

.NET objects such as BackgroundWorker use a single .NET background thread, which corresponds to a single Windows or other OS thread. OS threads have supporting resources such as an execution stack that consume memory and are relatively expensive resources to create and run. However, many concurrent processing tasks require only the ability to schedule short-lived tasks that then suspend, waiting for further input. To simplify the process of creating and managing these tasks, the .NET Framework provides the System.Threading.ThreadPool class. The thread pool consists of two main sets of suspended tasks: a queue containing user work items and a pool of I/O completion callbacks, each waiting for a signal from the operating system. The number of threads in the thread pool is automatically tuned, and items can be either queued asynchronously or registered against a .NET WaitHandle synchronization object (for example, a lock, a semaphore, or an I/O request). This is how to queue a work item in the .NET thread pool: open System.Threading ThreadPool.QueueUserWorkItem(fun _ -> printf "Hello!") |> ignore

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2,820 3,256 122,503,168 122,503,168 122,503,168 110,810 5,094,828 571,469 3,885,808 120,944,520

1,006,421 1,003,601 1,014,103 1,010,847 124,395,520 1,892,352 124,395,520 1,892,352 124,395,520 1,892,352 2,087,125 1,976,315 438,102 -4,656,726 5,510,416 4,938,947 67,958,316 64,072,508 379,497,588 258,553,068

Async<'a> values are essentially a way of writing continuation-passing or callback programs explicitly Continuations themselves were described in 8 along with techniques to pass them explicitly Async<'a> are computations that call a success continuation when the asynchronous computation completes and an exception continuation if it fails They provide a form of managed asynchronous computation, where managed means that several aspects of asynchronous programming are handled automatically: Exception propagation is added for free : If an exception is raised during an asynchronous step, then the exception terminates the entire asynchronous computation and cleans up any resources declared using use, and the exception value is then handed to a continuation Exceptions may also be caught and managed within the asynchronous workflow by using try/with/finally Cancellation checking is added for free : The execution of an Async<'a> workflow automatically checks a cancellation flag at each asynchronous operation.

Run1 latches total versus runs -- difference and pct Run1 Run2 Diff Pct 804,522 6,840,599 6,036,077 11.76% PL/SQL procedure successfully completed. This confirms you have the RUNSTATS_PKG package installed and shows you why you should use a single SQL statement instead of a bunch of procedural code when developing applications whenever possible!

Mystat.sql and its companion, mystat2.sql, are used to show the increase in some Oracle statistic before and after some operation. Mystat.sql captures the begin value of some statistic set echo off set verify off column value new_val V define S="&1" set autotrace off select a.name, b.value from v$statname a, v$mystat b where a.statistic# = b.statistic# and lower(a.name) like '%' || lower('&S')||'%' / set echo on and mystat2.sql reports the difference (&V is populated by running the first script, mystat.sql it uses the SQL*Plus NEW_VAL feature for that. It contains the last VALUE selected from the query above): set echo off set verify off select a.name, b.value V, to_char(b.value-&V,'999,999,999,999') diff from v$statname a, v$mystat b where a.statistic# = b.statistic# and lower(a.name) like '%' || lower('&S')||'%' / set echo on

Cancellation is controlled through the use of asynchronous groups, a topic covered at http://www expert-fsharpcom/Topics/Cancellation Resource lifetime management is fairly simple: You can protect resources across parts of an asynchronous computation by using use inside the workflow syntax If we put aside the question of cancellation, values of type Async<'a> are effectively identical to the following type: type Async<'a> = Async of ('a -> unit) * (exn -> unit) -> unit Here the functions are the success continuation and exception continuations, respectively Each value of type Async<'a> should eventually call one of these two continuations The async object is of type AsyncBuilder and supports the following methods, among others: type AsyncBuilder with member Return : 'a -> Async<'a> member Delay : (unit -> Async<'a>) -> Async<'a> member Using: 'a * ('a -> Async<'b>) -> Async<'b> when 'a :> System.

1031 0 0 4078637 53154 4796 1 0 71917

consistent gets physical reads redo size bytes sent via SQL*Net to client bytes received via SQL*Net from client SQL*Net roundtrips to/from client sorts (memory) sorts (disk) rows processed

IDisposable member Let: 'a * ('a -> Async<'b>) -> Async<'b> member Bind: Async<'a> * ('a -> Async<'b>) -> Async<'b> The full definition of Async<'a> values and the implementations of these methods for the async object are given in the F# library source code As you saw in 9, builder objects such as async containing methods like those shown previously mean that the syntax async { .. } can be used as a way of building Async<'a> values Table 13-2 shows the common constructs used in asynchronous workflow expressions For example, the following asynchronous workflow:.