EmbLogic's Blog

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date    2014.06.07.07.30.30;    author root;    state Exp;
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@simple program of thread.
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1.1
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@Initial revision
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RCS file: ./1.py,v
Working file: ./1.py
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description:
this is python program
i have print name and age
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revision 1.1
date: 2014/06/07 07:21:42;  author: root;  state: Exp;
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RCS file: fun2,v
Working file: fun2
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description:
check the even and odd number
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revision 1.1
date: 2014/06/07 05:06:48; author: root; state: Exp;
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description:
sum of two number using function
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revision 1.1
date: 2014/06/07 05:00:40; author: root; state: Exp;
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description:
draw a line usig function
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revision 1.1
date: 2014/06/07 04:55:05; author: root; state: Exp;
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RCS file: ./3.cpp,v
Working file: ./3.cpp
head: 1.1
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total revisions: 1;    selected revisions: 1
description:
used c++ in this program
made class and objects
successfully running.
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revision 1.1
date: 2014/06/06 13:58:38;  author: root;  state: Exp;
Initial revision
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why it is necessary to declare the size of an array when entring the string from terminal while there is no need to declare the size when entering string  through program??

• Thread operations include thread creation, termination, synchronization (joins,blocking), scheduling, data management and process interaction.
• A thread does not maintain a list of created threads, nor does it know the thread that created it.
• All threads within a process share the same address space.
• Threads in the same process share:
  • Process instructions
  • Most data
  • open files (descriptors)
  • signals and signal handlers
  • current working directory
  • User and group id
• Each thread has a unique:
  • Thread ID
  • set of registers, stack pointer
  • stack for local variables, return addresses
  • signal mask
  • priority
  • Return value: errno
• pthread functions return “0? if OK.

The POSIX thread libraries are a standards based thread API for C/C++. It allows one to spawn a new concurrent process flow. It is most effective on multi-processor or multi-core systems where the process flow can be scheduled to run on another processor thus gaining speed through parallel or distributed processing. Threads require less overhead than “forking” or spawning a new process because the system does not initialize a new system virtual memory space and environment for the process. While most effective on a multiprocessor system, gains are also found on uniprocessor systems which exploit latency in I/O and other system functions which may halt process execution. (One thread may execute while another is waiting for I/O or some other system latency.) Parallel programming technologies such as MPI and PVM are used in a distributed computing environment while threads are limited to a single computer system. All threads within a process share the same address space. A thread is spawned by defining a function and its arguments which will be processed in the thread. The purpose of using the POSIX thread library in your software is to execute software faster