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Top Forums Shell Programming and Scripting On how to select the right tool for a given task Post 302247995 by ghostdog74 on Thursday 16th of October 2008 10:06:29 PM
Old 10-16-2008
Quote:
Originally Posted by cfajohnson

It is wasteful (in terms of both time and resources) to use an external program to do something that the shell can do internally.
i understand where you are coming from. but there are few situations i can think of that using shell provided internals are not suitable
1) writing portable scripts. The syntax that you use for string manipulations in bash for example, is not universal for every shell
2) doing more complex string manipulation like grouped pattern matches.
3) and of course, using sed to go over files can be faster than using pure shell constructs.
 

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kernel_thread_w_arg(9r) 												   kernel_thread_w_arg(9r)

NAME
kernel_thread_w_arg - General: Starts a kernel thread with a calling argument passed in SYNOPSIS
thread_t kernel_thread_w_arg( task_t task, void (*start) (void), void* argument ); ARGUMENTS
Specifies a pointer to a task structure. This pointer identifies the task in which the kernel_thread_w_arg routine starts the newly cre- ated kernel thread. Specifies a pointer to a routine that is the entry point for the newly created kernel thread. Specifies the argument that kernel_thread_w_arg passes to the entry point specified in start. DESCRIPTION
The kernel_thread_w_arg routine creates and starts a kernel thread in the specified task at the specified entry point with a specified argument. The kernel_thread_w_arg routine passes the specified argument to the newly created kernel thread. The kernel_thread_w_arg rou- tine creates and starts a kernel thread with timeshare scheduling. A kernel thread created with timeshare scheduling means that its prior- ity degrades if it consumes an inordinate amount of CPU resources. A kernel module should call kernel_thread_w_arg only for long-running tasks. A kernel module should always attach a kernel thread to the ``first task.'' NOTES
This routine is actually a convenience wrapper for the thread_create routine (which creates the kernel thread) and the thread_start routine (which starts the newly created kernel thread). The kernel_thread_w_arg routine behaves identically to kernel_isrthread except that with kernel_thread_w_arg you can pass an argument to the entry point for the newly created kernel thread. RETURN VALUES
Upon successful completion, kernel_thread_w_arg returns a pointer to the thread structure associated with the kernel thread started at the specified entry point. Kernel modules can use this pointer as a handle to a specific kernel thread in calls to other kernel threads-related routines. SEE ALSO
Routines: kernel_isrthread(9r), thread_create(9r), thread_start(9r) Data Structures: task(9s), thread(9s) kernel_thread_w_arg(9r)
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