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Top Forums Shell Programming and Scripting On how to select the right tool for a given task Post 302248875 by cfajohnson on Monday 20th of October 2008 02:45:40 AM
Old 10-20-2008
Quote:
Originally Posted by ghostdog74
i fully understand cfajohnson's point of view that "sed (or any external command) should not be used to chop a single string".
I am arguing that that's not true because
1) for some situations, using sed's regexp is easier, especially to a person versed in the art of regexp. in this situation, development time is more important than execution time.

For someone who knows parameter expansion, both development time and execution time will be saved by using it.
Quote:
2) processor time/resources are so cheap nowadays that its insignificant to even mention.

Real time is as significant as it ever was. Using external commands unnecessarily can turn a snappy script into a slug.
 

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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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