Jun 05, 2009  I can use my programs by compiling them and going into the folder where dev outputs the executable file and start it 'manually'. It just won't run from dev There is nothing in any other forum about this, which means that it either is a really new problem or it is really easy to fix and I just miss something, or it is just me comp that is stupid. Now you are ready to write your first C program. Using Dev-C compiler Select File = New source file from the Menu bar or click on the “New source file” button on the toolbar. The editor window opens with the template of a C source code. Replace the words “Insert comments here” with your name and the name of the program. How to run threads using Dev C Download. A pop-up window like this should appear: Click on Open with Dev-C Package Manager(default) and press OK. The packages will get automatically installed, you have no need to do anything further with the download. For example if your dev C programs are usually saved in C:Dev. Nov 24, 2019 C is quite cross-platform, so a C Program written in Windows can Run on Linux ( and android ) and vice versa. Special Note: You might be wondering why i included C where we should be only focusing on C. The Reason is, C was actually developed as a superset of C Programming Language, and nowadays nobody builds a compiler specific for only C.

• How To Run Thread Program In Dev C 2017
• Dev C++ Program Download
• How To Run Thread Program In Dev C Windows 10
• How To Run Thread Program In Dev C Pdf

• C++ Basics

• C++ Object Oriented

• C++ Advanced

• C++ Useful Resources

• Selected Reading

Multithreading is a specialized form of multitasking and a multitasking is the feature that allows your computer to run two or more programs concurrently. In general, there are two types of multitasking: process-based and thread-based.

Process-based multitasking handles the concurrent execution of programs. Thread-based multitasking deals with the concurrent execution of pieces of the same program.

A multithreaded program contains two or more parts that can run concurrently. Each part of such a program is called a thread, and each thread defines a separate path of execution.

C++ does not contain any built-in support for multithreaded applications. Instead, it relies entirely upon the operating system to provide this feature.

This tutorial assumes that you are working on Linux OS and we are going to write multi-threaded C++ program using POSIX. POSIX Threads, or Pthreads provides API which are available on many Unix-like POSIX systems such as FreeBSD, NetBSD, GNU/Linux, Mac OS X and Solaris.

Creating Threads

The following routine is used to create a POSIX thread −

Here, pthread_create creates a new thread and makes it executable. This routine can be called any number of times from anywhere within your code. Here is the description of the parameters −

Sr.No	Parameter & Description
1	thread An opaque, unique identifier for the new thread returned by the subroutine.
2	attr An opaque attribute object that may be used to set thread attributes. You can specify a thread attributes object, or NULL for the default values.
3	start_routine The C++ routine that the thread will execute once it is created.
4	arg A single argument that may be passed to start_routine. It must be passed by reference as a pointer cast of type void. NULL may be used if no argument is to be passed.

The maximum number of threads that may be created by a process is implementation dependent. Once created, threads are peers, and may create other threads. There is no implied hierarchy or dependency between threads.

Terminating Threads

There is following routine which we use to terminate a POSIX thread −

Here pthread_exit is used to explicitly exit a thread. Typically, the pthread_exit() routine is called after a thread has completed its work and is no longer required to exist.

If main() finishes before the threads it has created, and exits with pthread_exit(), the other threads will continue to execute. Otherwise, they will be automatically terminated when main() finishes.

Example

This simple example code creates 5 threads with the pthread_create() routine. Each thread prints a 'Hello World!' message, and then terminates with a call to pthread_exit().

Compile the following program using -lpthread library as follows −

Now, execute your program which gives the following output −

Passing Arguments to Threads

This example shows how to pass multiple arguments via a structure. You can pass any data type in a thread callback because it points to void as explained in the following example −

When the above code is compiled and executed, it produces the following result −

Joining and Detaching Threads

There are following two routines which we can use to join or detach threads −

The pthread_join() subroutine blocks the calling thread until the specified 'threadid' thread terminates. When a thread is created, one of its attributes defines whether it is joinable or detached. Only threads that are created as joinable can be joined. If a thread is created as detached, it can never be joined.

This example demonstrates how to wait for thread completions by using the Pthread join routine.

When the above code is compiled and executed, it produces the following result −

-->

The Microsoft C/C++ compiler (MSVC) provides support for creating multithread applications. Consider using more than one thread if your application needs to perform expensive operations that would cause the user interface to become unresponsive.

With MSVC, there are several ways to program with multiple threads: You can use C++/WinRT and the Windows Runtime library, the Microsoft Foundation Class (MFC) library, C++/CLI and the .NET runtime, or the C run-time library and the Win32 API. This article is about multithreading in C. For example code, see Sample multithread program in C.

Multithread programs

A thread is basically a path of execution through a program. It's also the smallest unit of execution that Win32 schedules. A thread consists of a stack, the state of the CPU registers, and an entry in the execution list of the system scheduler. Each thread shares all the process's resources.

A process consists of one or more threads and the code, data, and other resources of a program in memory. Typical program resources are open files, semaphores, and dynamically allocated memory. A program executes when the system scheduler gives one of its threads execution control. The scheduler determines which threads should run and when they should run. Threads of lower priority might have to wait while higher priority threads complete their tasks. On multiprocessor machines, the scheduler can move individual threads to different processors to balance the CPU load.

Each thread in a process operates independently. Unless you make them visible to each other, the threads execute individually and are unaware of the other threads in a process. Threads sharing common resources, however, must coordinate their work by using semaphores or another method of interprocess communication. For more information about synchronizing threads, see Writing a Multithreaded Win32 Program.

Library support for multithreading

All versions of the CRT now support multithreading, with the exception of the non-locking versions of some functions. For more information, see Multithreaded libraries performance. For information on the versions of the CRT available to link with your code, see CRT library features.

Include files for multithreading

Standard CRT include files declare the C run-time library functions as they're implemented in the libraries. If your compiler options specify the __fastcall or __vectorcall calling conventions, the compiler assumes all functions should be called using the register calling convention. The run-time library functions use the C calling convention, and the declarations in the standard include files tell the compiler to generate correct external references to these functions.

CRT functions for thread control

All Win32 programs have at least one thread. Any thread can create additional threads. A thread can complete its work quickly and then terminate, or it can stay active for the life of the program.

The CRT libraries provide the following functions for thread creation and termination: _beginthread, _beginthreadex, _endthread, and _endthreadex.

The _beginthread and _beginthreadex functions create a new thread and return a thread identifier if the operation is successful. The thread terminates automatically if it completes execution. Or, it can terminate itself with a call to _endthread or _endthreadex.

Note

How To Run Thread Program In Dev C 2017

If you call C run-time routines from a program built with libcmt.lib, you must start your threads with the _beginthread or _beginthreadex function. Do not use the Win32 functions ExitThread and CreateThread. Using SuspendThread can lead to a deadlock when more than one thread is blocked waiting for the suspended thread to complete its access to a C run-time data structure.

The _beginthread and _beginthreadex functions

The _beginthread and _beginthreadex functions create a new thread. A thread shares the code and data segments of a process with other threads in the process but has its own unique register values, stack space, and current instruction address. The system gives CPU time to each thread, so that all threads in a process can execute concurrently.

You can also download Synchro Arts Revoice Pro / Vocalign Project Pro.G-Sonique Ultrabass MX4 VST has two filter modules that can operate in sequential or parallel blending mode. G-Sonique Ultrabass MX4 VST ReviewG-Sonique Ultrabass MX4 VST is a convenient audio processing application, which is a bass synthesizer for various musical styles. It was based on the Alien 303 DNA concept, since it provides stable bass energy and the ability to create bass lines as quickly as possible. G sonique vst free download. It has single and dual generators and has 15 different forms, such as Digital Saw, Saw HB, Analogue Ramp and many others. The first filter modules have 4 analog low-pass filters, including low-frequency, low-frequency, low-frequency 303 and analog low-frequency.

_beginthread and _beginthreadex are similar to the CreateThread function in the Win32 API but has these differences:

• They initialize certain C run-time library variables. That's important only if you use the C run-time library in your threads.

• CreateThread helps provide control over security attributes. You can use this function to start a thread in a suspended state.

_beginthread and _beginthreadex return a handle to the new thread if successful or an error code if there was an error.

The _endthread and _endthreadex functions

The _endthread function terminates a thread created by _beginthread (and similarly, _endthreadex terminates a thread created by _beginthreadex). Threads terminate automatically when they finish. _endthread and _endthreadex are useful for conditional termination from within a thread. A thread dedicated to communications processing, for example, can quit if it is unable to get control of the communications port.

Writing a multithreaded Win32 program

When you write a program with multiple threads, you must coordinate their behavior and use of the program's resources. Also, make sure that each thread receives its own stack.

Sharing common resources between threads

Note

For a similar discussion from the MFC point of view, see Multithreading: Programming Tips and Multithreading: When to Use the Synchronization Classes.

Each thread has its own stack and its own copy of the CPU registers. Other resources, such as files, static data, and heap memory, are shared by all threads in the process. Threads using these common resources must be synchronized. Win32 provides several ways to synchronize resources, including semaphores, critical sections, events, and mutexes.

When multiple threads are accessing static data, your program must provide for possible resource conflicts. Consider a program where one thread updates a static data structure containing x,y coordinates for items to be displayed by another thread. If the update thread alters the x coordinate and is preempted before it can change the y coordinate, the display thread might be scheduled before the y coordinate is updated. The item would be displayed at the wrong location. You can avoid this problem by using semaphores to control access to the structure.

A mutex (short for mutual exclusion) is a way of communicating among threads or processes that are executing asynchronously of one another. This communication can be used to coordinate the activities of multiple threads or processes, typically by controlling access to a shared resource by locking and unlocking the resource. To solve this x,y coordinate update problem, the update thread sets a mutex indicating that the data structure is in use before performing the update. It would clear the mutex after both coordinates had been processed. The display thread must wait for the mutex to be clear before updating the display. This process of waiting for a mutex is often called blocking on a mutex, because the process is blocked and cannot continue until the mutex clears.

The Bounce.c program shown in Sample Multithread C Program uses a mutex named ScreenMutex to coordinate screen updates. Each time one of the display threads is ready to write to the screen, it calls WaitForSingleObject with the handle to ScreenMutex and constant INFINITE to indicate that the WaitForSingleObject call should block on the mutex and not time out. If ScreenMutex is clear, the wait function sets the mutex so other threads can't interfere with the display, and continues executing the thread. Otherwise, the thread blocks until the mutex clears. When the thread completes the display update, it releases the mutex by calling ReleaseMutex.

Screen displays and static data are only two of the resources requiring careful management. For example, your program might have multiple threads accessing the same file. Because another thread might have moved the file pointer, each thread must reset the file pointer before reading or writing. In addition, each thread must make sure that it isn't preempted between the time it positions the pointer and the time it accesses the file. These threads should use a semaphore to coordinate access to the file by bracketing each file access with WaitForSingleObject and ReleaseMutex calls. The following code example illustrates this technique:

Thread stacks

All of an application's default stack space is allocated to the first thread of execution, which is known as thread 1. As a result, you must specify how much memory to allocate for a separate stack for each additional thread your program needs. The operating system allocates additional stack space for the thread, if necessary, but you must specify a default value.

The first argument in the _beginthread call is a pointer to the BounceProc function, which executes the threads. The second argument specifies the default stack size for the thread. The last argument is an ID number that is passed to BounceProc. BounceProc uses the ID number to seed the random number generator and to select the thread's color attribute and display character.

Threads that make calls to the C run-time library or to the Win32 API must allow sufficient stack space for the library and API functions they call. The C printf function requires more than 500 bytes of stack space, and you should have 2K bytes of stack space available when calling Win32 API routines.

Dev C++ Program Download

Because each thread has its own stack, you can avoid potential collisions over data items by using as little static data as possible. Design your program to use automatic stack variables for all data that can be private to a thread. The only global variables in the Bounce.c program are either mutexes or variables that never change after they're initialized.

Win32 also provides Thread-local storage (TLS) to store per-thread data. For more information, see Thread local storage (TLS).

Avoiding problem areas with multithread programs

There are several problems you might encounter in creating, linking, or executing a multithread C program. Some of the more common problems are described in the following table. (For a similar discussion from the MFC point of view, see Multithreading: Programming Tips.)

Problem	Probable cause
You get a message box showing that your program caused a protection violation.	Many Win32 programming errors cause protection violations. A common cause of protection violations is the indirect assignment of data to null pointers. Because it results in your program trying to access memory that doesn't belong to it, a protection violation is issued. An easy way to detect the cause of a protection violation is to compile your program with debugging information and then run it through the debugger in the Visual Studio environment. When the protection fault occurs, Windows transfers control to the debugger, and the cursor is positioned on the line that caused the problem.
Your program generates numerous compile and link errors.	You can eliminate many potential problems by setting the compiler's warning level to one of its highest values and heeding the warning messages. By using the level 3 or level 4 warning level options, you can detect unintentional data conversions, missing function prototypes, and use of non-ANSI features.

How To Run Thread Program In Dev C Windows 10

See also

How To Run Thread Program In Dev C Pdf

Multithreading Support for Older Code (Visual C++)
Sample multithread program in C
Thread local storage (TLS)
Concurrency and asynchronous operations with C++/WinRT
Multithreading with C++ and MFC