thread and shared memory manipulation

i m working with posix threads and two of my threads are simultaneously accessing a global variable...may i know of a way to suspend action of one thread only for that variable unless the other has performed opereation....can u give me a code snippet for the same...please note i dont want to mutex lock the thread since it blocks the whole thread..

Like this recent thread perhaps?
http://cboard.cprogramming.com/showthread.php?t=80989

but then the thread neva answered as to how to solved my problem...coz m facing it....i mean if it could be syntax or probably a small example

Well you use a semaphore or a mutex to guard the access to the variable.
http://www.llnl.gov/computing/tutorials/pthreads/
http://yolinux.com/TUTORIALS/LinuxTu...ixThreads.html

thanks a lot....