do-while

Though this topic has been discussed many times in this forum and all other forums, still I have doubts. Please help. How does the do{} while(0) in macro work in Linux kernel? For example, #define preempt_disable() do { } while (0) How does it disable preempt? #define might_resched() do { } while (0) How does it reschedule? Similarly I have seen macros for mutex locks and other also. How does this help? I understand for following problem but not for the examples above. #define foo(x) do { do something } while(0) Edit: What about the following code for rt_mutex_lock ? /** * rt_mutex_lock - lock

I've got my script working almost. The goal of this is to take defined values from a file and then populate these valeus in a shell script at runtime. Please take a look at what i have here... The first file: ab.sh #!/bin/bash USER_TYPE=$1 #IDENTIFY USER TYPE TYPE1,TYPE2,TYPE3,TYPE4 USERNAME=$2 PERMISSION_TYPE=$3 #IDENTIFY PERMISSION TYPE SELECT,UPDATE,DELETE,INSERT TARGET_USER=$4 TARGET_TABLE=$5 if [ $USER_TYPE == 'TYPE1' ] then cat Parameters.conf |while read USERNAME do sqlplus / as sysdba << E00 CREATE USER ${USERNAME} DEFAULT TABLESPACE USERS TEMPORARY TABLESPACE TEMP ACCOUNT UNLOCK;

When the code flow is like this: if(check()) { ... ... if(check()) { ... ... if(check()) { ... ... } } } I have generally seen this work around to avoid the above messy code flow: do { if(!check()) break; ... ... if(!check()) break; ... ... if(!check()) break; ... ... } while(0); What are some better ways that avoid this work-around/hack so that it becomes a higher-level (industry level) code? Any suggestions which are out of the box are welcome! It is considered acceptable practice to isolate these decisions in a function and use return s instead of break s. While all these checks correspond

Is there any method for implement do while loop in SQL server 2008? Pratik I am not sure about DO-WHILE IN MS SQL Server 2008 but you can change your WHILE loop logic, so as to USE like DO-WHILE loop. Examples are taken from here: http://blog.sqlauthority.com/2007/10/24/sql-server-simple-example-of-while-loop-with-continue-and-break-keywords/ Example of WHILE Loop DECLARE @intFlag INT SET @intFlag = 1 WHILE (@intFlag <=5) BEGIN PRINT @intFlag SET @intFlag = @intFlag + 1 END GO ResultSet: 1 2 3 4 5 Example of WHILE Loop with BREAK keyword DECLARE @intFlag INT SET @intFlag = 1 WHILE (@intFlag <

Possible Duplicates: While vs. Do While When should I use do-while instead of while loops? I've been programming for a while now (2 years work + 4.5 years degree + 1 year pre-college), and I've never used a do-while loop short of being forced to in the Introduction to Programming course. I have a growing feeling that I'm doing programming wrong if I never run into something so fundamental. Could it be that I just haven't run into the correct circumstances? What are some examples where it would be necessary to use a do-while instead of a while? (My schooling was almost all in C/C++ and my work

When I was taking CS in college (mid 80's), one of the ideas that was constantly repeated was to always write loops which test at the top (while...) rather than at the bottom (do ... while) of the loop. These notions were often backed up with references to studies which showed that loops which tested at the top were statistically much more likely to be correct than their bottom-testing counterparts. As a result, I almost always write loops which test at the top. I don't do it if it introduces extra complexity in the code, but that case seems rare. I notice that some programmers tend to almost