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Full Discussion: locking mechanism
Top Forums Shell Programming and Scripting locking mechanism Post 302239251 by jim mcnamara on Tuesday 23rd of September 2008 07:33:08 AM
Old 09-23-2008
Code:
#!/bin/ksh

lockit()
{
     [[ -w /tmp/lockfile ]] ||  > /tmp/lockfile
     let count=0
     echo 'checking lock...'
     while [[ -s /tmp/lockfile ]]
     do
           sleep 30           
           count=#(( count  + 1 ))
           if [[ count -eq 10 ]] ; then
                  echo 'cannot obtain lock'
                  exit 1
           fi
     done
      echo "$$" > /tmp/lockfile
     echo 'got lock'
}

unlock()
{
      > /tmp/lockfile

}
# main --------------------------
lockit

trap '> /tmp/lockfile; kill -9 $$ ' EXIT  HUP  INT

.  /path/to/myscript.sh
STATUS=$?

unlock
trap ' ' EXIT
exit $STATUS

Put your scriptname inside this type of script. If your script has trap commands they may override the ones here. This is just meant as a simple starting point.
 

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SbThreadAutoLock(3)						       Coin						       SbThreadAutoLock(3)

NAME
SbThreadAutoLock - Simple convenience class for locking access to a function. This class provides a simple convenience mechanism for automatically locking access to a function that is not re-entrant. SYNOPSIS
#include <Inventor/threads/SbThreadAutoLock.h> Public Member Functions SbThreadAutoLock (SbMutex *mutexptr) SbThreadAutoLock (SbThreadMutex *mutexptr) ~SbThreadAutoLock () Protected Attributes SbMutex * mutex SbThreadMutex * recmutex Detailed Description Simple convenience class for locking access to a function. This class provides a simple convenience mechanism for automatically locking access to a function that is not re-entrant. Usage example: void myfunction(void) { SbThreadAutoLock lock(aMutexPtr); // [other code] } In the class constructor, SbMutex::lock() is called on the mutex, and when the function exits (this is the convenience part) the destructor will automatically be invoked, calling SbMutex::unlock() on the same mutex. Constructor &; Destructor Documentation SbThreadAutoLock::SbThreadAutoLock (SbMutex *mutex) [inline] The constructor calls SbMutex::lock() on mutex. SbThreadAutoLock::SbThreadAutoLock (SbThreadMutex *mutex) [inline] The constructor calls SbThreadMutex::lock() on mutex. SbThreadAutoLock::~SbThreadAutoLock () [inline] The destructor calls unlock() on the mutex passed in as a parameter to the constructor. Member Data Documentation SbThreadAutoLock::recmutex [protected] This API member is considered internal to the library, as it is not likely to be of interest to the application programmer. Author Generated automatically by Doxygen for Coin from the source code. Version 3.1.3 Wed May 23 2012 SbThreadAutoLock(3)
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